【狂神说Java】SpringMVC详细笔记(全)

文章目录

• 一、什么是SpringMVC
• • 1.1、springmvc-01-serlvet模块
  • • 1、模块
    • 2、添加Web app的支持！
    • 3、pom.xml (springmvc-01-serlvet)
    • 4、HelloServlet
    • 5、test
    • 6、web
    • 7、from
    • 8、结果
  • 1.2、MVC框架要做哪些事情
  • 1.3、文档
  • 1.4、注意
• 二、第一个MVC程序
• • 1.1、springmvc-02-hellomvc
  • • 1、模块
    • 2、web.xml
    • 3、springmvc-servlet.xml
    • 4、HelloController.java
    • 5、Configurations配置
    • 6、查看Project Structure
    • 7、结果
  • 1.2、中心控制器
  • 1.3、深入学习SpringMVC
  • • 1、web
    • 2、springmvc-servlet.xml
    • 3、HelloController.java
  • 1.4、使用注解开发SpringMVC
  • 模块
  • • 1、web.xml
    • 2、springmvc-servlet.xml
    • 3、HelloController
    • 4、查看Tomcat配置
    • 5、lib中加入所有包
    • 6、结果
• 三、Controller及RestFul
• • 第一种方法——实现Controller接口
  • • springmvc-04-controller模块
    • • 1、web
      • 2、springmvc-servlet.xml
      • 3、ControllerTest1
      • 4、test.jsp
      • 5、结果:
  • 第二种——使用注解@Controller
  • • 1、ControllerTest2
    • 2、springmvc-servlet.xml
    • 3、结果
  • RestFul 风格
  • • RestFulController
    • 结果
    • post方法
• 四、数据处理及跳转
• • 4.1、结果跳转方式
  • • ModelTest1
  • 4.2、数据处理
  • 4.3、乱码问题
  • • 问题：
    • 过滤器解决乱码
• 五、Json交互处理
• • 5.1、Jackson Databind 导入依赖
  • 5.2、解决json乱码问题
  • • 方法一
    • 方法二
  • 5.3、返回json字符串统一解决
  • • 1、返回多个对象
    • 2、默认时间戳
    • 3、纯java解决—时间戳
    • 4、不使用时间戳的方式
    • 5、工具类
  • 5.4、FastJson
• 六、SpringMVC:整合SSM
• • 6.1、环境要求：
  • 6.2、创建数据库
  • 6.3、导入依赖
  • • 1、pom文件依赖
    • 2、数据库
    • 3、maven静态资源导出问题
  • 6.4、基本架构和配置文件
  • 6.5、Mybatis层
  • • 实体类pojo层
    • 接口dao层
    • 业务service层
  • 6.6、Spring层
  • 6.7、SpringMVC层
  • 排错思路
  • • 问题：启动不了，工件 ssmbuild:war exploded: 部署工件时出错。请参阅服务器日志了解详细信息。
    • 问题：bean不存在（500）
  • 6.8、查询书籍
  • 6.9、添加书籍
  • 6.10、修改书籍
  • 6.11、删除书籍
  • 6.12、查询书籍
  • 6.13、显示全部书籍
• 七、Ajax研究
• 八、拦截器
• • 8.1、拦截器的true与false
  • • 首页----登录页面，
    • 拦截器
    • 登录页面登录

一、什么是SpringMVC

SpringMVC01：什么是SpringMVC
假设：你的项目的架构，是设计好的，还是演进的？

• AlibabaPHP
• 随着用户大，Java
• 王坚去IOE
• MySQL·MySQL:MySQL->AliSQL、
• AliRedis·All in one->微服务

首先创建项目SpringMVC，导入依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>org.example</groupId>
  <artifactId>SpringMVC</artifactId>
  <version>1.0-SNAPSHOT</version>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.13.2</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>5.2.0.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>servlet-api</artifactId>
      <version>2.5</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>jsp-api</artifactId>
      <version>2.2</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>
  </dependencies>

</project>

1.1、springmvc-01-serlvet模块

1、模块

2、添加Web app的支持！

3、pom.xml (springmvc-01-serlvet)

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <parent>
    <artifactId>SpringMVC</artifactId>
    <groupId>com.blue</groupId>
    <version>1.0-SNAPSHOT</version>
  </parent>
  <modelVersion>4.0.0</modelVersion>

  <artifactId>springmvc-01-serlvet</artifactId>

  <properties>
    <maven.compiler.source>8</maven.compiler.source>
    <maven.compiler.target>8</maven.compiler.target>
  </properties>

  <dependencies>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>servlet-api</artifactId>
      <version>2.5</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>jsp-api</artifactId>
      <version>2.2</version>
    </dependency>
  </dependencies>

</project>

4、HelloServlet

package com.blue.servlet;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

//实现Servlet接口
public class HelloServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //取得参数
        String method = req.getParameter("method");
        if (method.equals("add")){
            req.getSession().setAttribute("msg","执行了add方法");
        }
        if (method.equals("delete")){
            req.getSession().setAttribute("msg","执行了delete方法");
        }
        //业务逻辑
        //视图跳转
        req.getRequestDispatcher("/WEB-INF/jsp/hello.jsp").forward(req,resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req,resp);
    }
}

5、test

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
  <html>
    <head>
      <title>Title</title>
    </head>
    <body>

      ${msg}

    </body>
  </html>

6、web

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
  version="4.0">

  <servlet>
    <servlet-name>hello</servlet-name>
    <servlet-class>com.blue.servlet.HelloServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>hello</servlet-name>
    <url-pattern>hello</url-pattern>
  </servlet-mapping>

</web-app>

7、from

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
  <html>
    <head>
      <title>Title</title>
    </head>
    <body>

      <form action="/hello" method="post">
        <input type="text" name="method">
        <input type="submit">
      </form>

    </body>
  </html>

8、结果

/hello

?method=delete

1.2、MVC框架要做哪些事情

• 将url映射到java类或java类的方法
• 封装用户提交的数据 .
• 处理请求–调用相关的业务处理–封装响应数据
• 将响应的数据进行渲染 . jsp / html 等表示层数据

1.3、文档

4.3.24文档

1.4、注意

如果出现404问题，请查看

然后加入所有的包

二、第一个MVC程序

1.1、springmvc-02-hellomvc

1、模块

2、web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
  version="4.0">

  <!--1.注册DispatcherServlet-->
  <servlet>
    <servlet-name>springmvc</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <!--关联一个springmvc的配置文件:【servlet-name】-servlet.xml-->
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:springmvc-servlet.xml</param-value>
    </init-param>
    <!--启动级别-1-->
    <load-on-startup>1</load-on-startup>
  </servlet>

  <!--/ 匹配所有的请求；（不包括.jsp）-->
  <!--/* 匹配所有的请求；（包括.jsp）-->
  <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

</web-app>

3、springmvc-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
  http://www.springframework.org/schema/beans/spring-beans.xsd">
    
    
    <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>
    <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/>
    
    <!--视图解析器:DispatcherServlet给他的ModelAndView-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="InternalResourceViewResolver">
        <!--前缀-->
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <!--后缀-->
        <property name="suffix" value=".jsp"/>
    </bean>
    
    <!--Handler-->
    <bean id="/hello" class="org.example.controller.HelloController"/>

</beans>

4、HelloController.java

package org.example.controller;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

//注意：这里我们先导入Controller接口
public class HelloController implements Controller {
    @Override
    public ModelAndView handleRequest(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws Exception {
        //ModelAndView 模型和视图
        ModelAndView mv = new ModelAndView();

        //封装对象，放在ModelAndView中。Model
        mv.addObject("msg","HelloSpringMVC!");
        //封装要跳转的视图，放在ModelAndView中
        mv.setViewName("hello"); //: /WEB-INF/jsp/hello.jsp
        return mv;
    }
}

5、Configurations配置

配置Tomcat

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
${msg}
</body>
</html>

如果报错404，就是lib依赖没进去

6、查看Project Structure

7、结果

成功！输入/hello

1.2、中心控制器

SpringMVC的原理如下图所示：
当发起请求时被前置的控制器拦截到请求，根据请求参数生成代理请求，找到请求对应的实际控制器，控制器处理请求，创建数据模型，访问数据库，将模型响应给中心控制器，控制器使用模型与视图渲染视图结果，将结果返回给中心控制器，再将结果返回给请求者。

HandlerMapping： 处理器映射器
HandlerAdapter： 处理器适配器
viewResolver： 视图解析器

图为SpringMVC的一个较完整的流程图，实线表示SpringMVC框架提供的技术，不需要开发者实现，虚线表示需要开发者实现。
流程：先申请了一个DispatherServlet,然后访问/hello根据springmvc-servlet.xml中的配置<bean id="/hello" class="com.blue.controller.HelloController"/>，找到对应的控制器，也就是com.blue.controller.HelloController，然后在对应的控制器类中处理，返回模型，然后根据模型中的跳转，赋值等，在springmvc-servlet.xml中配置的前缀和后缀，跳转到对应的页面

1.3、深入学习SpringMVC

DispatcherServlet

1、web

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
  version="4.0">

  <!--1.配置 DispatcherServlet，这个是SpringMVC的核心：请求分发器，前端控制器-->
  <servlet>
    <servlet-name>springmvc</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <!--DispatcherServlet要绑定springmvc的配置文件:【servlet-name】-servlet.xml-->
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:springmvc-servlet.xml</param-value>
    </init-param>
    <!--启动级别-1-->
    <load-on-startup>1</load-on-startup>
  </servlet>

  <!--/ 匹配所有的请求；（不包括.jsp）,一般用这个-->
  <!--/* 匹配所有的请求；（包括.jsp）-->
  <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

</web-app>

2、springmvc-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.springframework.org/schema/beans
  http://www.springframework.org/schema/beans/spring-beans.xsd">


  <!--   处理器映射器 -->
  <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>
  <!--   处理器适配器 -->
  <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/>

  <!--视图解析器:DispatcherServlet给他的ModelAndView-->
  <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="InternalResourceViewResolver">
    <!--前缀-->
    <property name="prefix" value="/WEB-INF/jsp/"/>
    <!--后缀-->
    <property name="suffix" value=".jsp"/>
  </bean>

  <!--Handler-->
  <bean id="/hello" class="com.blue.controller.HelloController"/>

</beans>

3、HelloController.java

package org.example.controller;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

//注意：这里我们先导入Controller接口
public class HelloController implements Controller {
    @Override
    public ModelAndView handleRequest(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws Exception {
        //ModelAndView 模型和视图
        ModelAndView mv = new ModelAndView();

        //封装对象，放在ModelAndView中。Model
        mv.addObject("msg","HelloSpringMVC!");
        //封装要跳转的视图，放在ModelAndView中
        mv.setViewName("hello"); //: /WEB-INF/jsp/hello.jsp
        return mv;
    }
}

1.4、使用注解开发SpringMVC

模块

1、web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
  version="4.0">

  <!--1.注册servlet-->
  <servlet>
    <servlet-name>SpringMVC</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <!--通过初始化参数指定SpringMVC配置文件的位置，进行关联-->
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:springmvc-servlet.xml</param-value>
    </init-param>
    <!-- 启动顺序，数字越小，启动越早 -->
    <load-on-startup>1</load-on-startup>
  </servlet>

  <!--所有请求都会被springmvc拦截 -->
  <servlet-mapping>
    <servlet-name>SpringMVC</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>


</web-app>

2、springmvc-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:context="http://www.springframework.org/schema/context"
  xmlns:mvc="http://www.springframework.org/schema/mvc"
  xsi:schemaLocation="http://www.springframework.org/schema/beans
  http://www.springframework.org/schema/beans/spring-beans.xsd
  http://www.springframework.org/schema/context
  https://www.springframework.org/schema/context/spring-context.xsd
  http://www.springframework.org/schema/mvc
  https://www.springframework.org/schema/mvc/spring-mvc.xsd">

  <!-- 自动扫描包，让指定包下的注解生效,由IOC容器统一管理 -->
  <context:component-scan base-package="com.blue.controller"/>
  <!-- 让Spring MVC不处理静态资源 -->
  <mvc:default-servlet-handler />
  <!--
  支持mvc注解驱动
  在spring中一般采用@RequestMapping注解来完成映射关系
  要想使@RequestMapping注解生效
  必须向上下文中注册DefaultAnnotationHandlerMapping
  和一个AnnotationMethodHandlerAdapter实例
  这两个实例分别在类级别和方法级别处理。
  而annotation-driven配置帮助我们自动完成上述两个实例的注入。
  -->
  <mvc:annotation-driven />

  <!-- 视图解析器 -->
  <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
    id="internalResourceViewResolver">
    <!-- 前缀 -->
    <property name="prefix" value="/WEB-INF/jsp/" />
    <!-- 后缀 -->
    <property name="suffix" value=".jsp" />
  </bean>

</beans>

3、HelloController

package org.example.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
    @RequestMapping("/hello")
    public class HelloController {
        //真实访问地址 : 项目名/hello/h1
        @RequestMapping("/h1")
        public String sayHello(Model model){
            //封装数据
            //向模型中添加属性msg与值，可以在JSP页面中取出并渲染
            model.addAttribute("msg","hello,SpringMVCAnnotation!");
            return "hello";   //web-inf/jsp/hello.jsp  会被视图解析器处理：
        }
    }

在视图解析器中我们把所有的视图都存放在/WEB-INF/目录下，这样可以保证视图安全，因为这个目录下的文件，客户端不能直接访问。

<%--
   Created by IntelliJ IDEA.
   User: dlmu
   Date: 2022/4/11
   Time: 16:25
   To change this template use File | Settings | File Templates.
 --%>
 
 <%@ page contentType="text/html;charset=UTF-8" language="java" %>
 <html>
 <head>
     <title>Title</title>
 </head>
 <body>
     ${msg}
 </body>
 </html>

4、查看Tomcat配置

5、lib中加入所有包

6、结果

三、Controller及RestFul

第一种方法——实现Controller接口

springmvc-04-controller模块

1、web

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
  version="4.0">

  <servlet>
    <servlet-name>springmvc</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:springmvc-servlet.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

</web-app>

2、springmvc-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:context="http://www.springframework.org/schema/context"
  xmlns:mvc="http://www.springframework.org/schema/mvc"
  xsi:schemaLocation="http://www.springframework.org/schema/beans
  http://www.springframework.org/schema/beans/spring-beans.xsd
  http://www.springframework.org/schema/context
  https://www.springframework.org/schema/context/spring-context.xsd
  http://www.springframework.org/schema/mvc
  https://www.springframework.org/schema/mvc/spring-mvc.xsd">

  <!--    &lt;!&ndash; 自动扫描包，让指定包下的注解生效,由IOC容器统一管理 &ndash;&gt;-->
  <!--    <context:component-scan base-package="com.blue.controller"/>-->
  <!--    &lt;!&ndash; 让Spring MVC不处理静态资源 &ndash;&gt;-->
  <!--    <mvc:default-servlet-handler />-->
  <!--    <mvc:annotation-driven />-->

  <!-- 视图解析器 -->
  <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
    id="internalResourceViewResolver">
    <property name="prefix" value="/WEB-INF/jsp/" />
    <property name="suffix" value=".jsp" />
  </bean>

  <bean name="/t1" class="org.example.controller.ControllerTest1"/>

</beans>

3、ControllerTest1

package org.example.controller;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.Controller;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

//只要实现了ControlLer 接口的类。说明这就是一个控制器了
public class ControllerTest1 implements Controller {

    @Override
    public ModelAndView handleRequest(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws Exception {
        ModelAndView mv = new ModelAndView();
        mv.addObject("msg","ControllerTest1");
        mv.setViewName("test");
        return mv;
    }
}

4、test.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
  <html>
    <head>
      <title>SpringMVC</title>
    </head>
    <body>
      ${msg}
    </body>
  </html>

5、结果:

第二种——使用注解@Controller

1、ControllerTest2

package org.example.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


@Controller //代表这个类会被spring接管
// 被这个注解的类 中的所有方法，如果返回值是spring，并且有具体的页面可以跳转
// 那么就会被视图解析器解析
public class ControllerTest2 {

    @RequestMapping("/t2")
    public String test1(Model model){
        model.addAttribute("msg","ControllerTest2");
        return "test";
    }
}

2、springmvc-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:context="http://www.springframework.org/schema/context"
  xmlns:mvc="http://www.springframework.org/schema/mvc"
  xsi:schemaLocation="http://www.springframework.org/schema/beans
  http://www.springframework.org/schema/beans/spring-beans.xsd
  http://www.springframework.org/schema/context
  https://www.springframework.org/schema/context/spring-context.xsd
  http://www.springframework.org/schema/mvc
  https://www.springframework.org/schema/mvc/spring-mvc.xsd">

  <!-- 自动扫描包，让指定包下的注解生效,由IOC容器统一管理 -->
  <context:component-scan base-package="org.example.controller"/>
  <!-- 让Spring MVC不处理静态资源 -->
  <!--    <mvc:default-servlet-handler />-->
  <mvc:annotation-driven />

  <!-- 视图解析器 -->
  <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
    id="internalResourceViewResolver">
    <property name="prefix" value="/WEB-INF/jsp/" />
    <property name="suffix" value=".jsp" />
  </bean>

</beans>

3、结果

正确

RestFul 风格

Restful就是一个资源定位及资源操作的风格。不是标准也不是协议，只是一种风格。基于这个风格设计的软件可以更简洁，更有层次，更易于实现缓存等机制。
功能
资源：互联网所有的事物都可以被抽象为资源
资源操作：使用POST、DELETE、PUT、GET，使用不同方法对资源进行操作。
分别对应 添加、 删除、修改、查询。
传统方式操作资源 ： 通过不同的参数来实现不同的效果！方法单一，post 和 get

http://127.0.0.1/item/queryItem.action?id=1 查询,GET
http://127.0.0.1/item/saveItem.action 新增,POST
http://127.0.0.1/item/updateItem.action 更新,POST
http://127.0.0.1/item/deleteItem.action?id=1 删除,GET或POST

使用RESTful操作资源 ： 可以通过不同的请求方式来实现不同的效果！如下：请求地址一样，但是功能可以不同！

http://127.0.0.1/item/1 查询,GET
http://127.0.0.1/item 新增,POST
http://127.0.0.1/item 更新,PUT
http://127.0.0.1/item/1 删除,DELETE

RestFulController

package com.blue.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class RestFulController {

    //原来的： http://localhost:8080/add?a=1&b=2
    //现在：  http://localhost:8080/add/a/b

    @RequestMapping("/add/{a}/{b}")
    public String test1(@PathVariable int a,@PathVariable int b, Model model){
        int res = a + b;
        model.addAttribute("msg","结果为"+res);
        return "test";
    }

    @RequestMapping("/add")
    public String test2(int a, int b, Model model){
        int res = a + b;
        model.addAttribute("msg","结果为"+res);
        return "test";
    }
}

结果

post方法

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
  <html>
    <head>
      <title>Title</title>
    </head>
    <body>
      <form action="/add/1/3" method="post">
        <input type="submit">
      </form>

    </body>
  </html>

package com.blue.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class RestFulController {

    //原来的： http://localhost:8080/add?a=1&b=2
    //现在：  http://localhost:8080/add/a/b

    //http://localhost:8080/add/a/b
    @RequestMapping("/add/{a}/{b}")
    public String test1(@PathVariable int a,@PathVariable int b, Model model){
        int res = a + b;
        model.addAttribute("msg","结果1为"+res);
        return "test";
    }

    //http://localhost:8080/add/1/3
    @PostMapping("/add/{a}/{b}")
    public String test3(@PathVariable int a,@PathVariable String b, Model model){
        String res = a + b;
        model.addAttribute("msg","结果2为"+res);
        return "test";
    }

}

结果：

四、数据处理及跳转

4.1、结果跳转方式

ModelAndView

ModelTest1

package com.blue.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

@Controller
public class ModelTest1 {

    @RequestMapping("m1/t1")	
    public String test1(HttpServletRequest request, HttpServletResponse response){
        HttpSession session = request.getSession();
        System.out.println(session.getId());
        return "test";
    }
}

修改

package com.blue.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

@Controller
public class ModelTest1 {

    @RequestMapping("m1/t1")
    public String test1(Model model){
        //转发
        model.addAttribute("msg","ModelTest1");
        return "forward:/WEB-INF/jsp/test.jsp";
    }

    @RequestMapping("/rsm/t3")
    public String test3(){
        //重定向
        return "redirect:/test.jsp";
    }

}

4.2、数据处理

package com.blue.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
@RequestMapping("/user")
public class UserController {
    
    // url: /user/t1?name=xxx  参数一致
    @GetMapping("/t1")
    public String test1(String name, Model model){
        // 1. 接收前端参数
        System.out.println("接收到前端的参数为"+name);

        // 2. 将返回的结果传递纷前端， Model
        model.addAttribute("msg",name);

        // 3. 视图跳转
        return "test";
    }

}

@Controller
@RequestMapping("/user")
public class UserController {

    @GetMapping("/t1")
    // url: /user/t1?username=xxx  参数不一致
    public String test1(@RequestParam("username") String name, Model model){
        // 1. 接收前端参数
        System.out.println("接收到前端的参数为"+name);

        // 2. 将返回的结果传递纷前端， Model
        model.addAttribute("msg",name);

        // 3. 视图跳转
        return "test";
    }

}

/*
1. 接收前端用户传递的参数，判断参数的名字，假设名字直接在方法上，可以直接使用
2. 假设传递的是一个对象User,匹User对象中的字段名：如果名字一致则OK,否则，匹配不到
*/
@GetMapping("/t2")
    public String test2(User user){
    System.out.println(user);
	return "test";
}

4.3、乱码问题

问题：

form.jsp

<html>
  <head>
    <title>Title</title>
  </head>
  <body>

    <form action="/e/t1" method="get">
      <input type="text" name="name">
      <input type="submit">
    </form>

  </body>
</html>

EncodingController

package com.blue.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PostMapping;

@Controller
public class EncodingController {

    @GetMapping("/e/t1")
    public String test1(String name, Model model){
        System.out.println(name);
        model.addAttribute("msg",name);
        return "test";
    }

}

过滤器解决乱码

加上过滤器
EncodingFilter

package com.blue.filter;


import javax.servlet.*;
import java.io.IOException;
import java.util.logging.LogRecord;

public class EncodingFilter implements Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain filterChain) throws IOException, ServletException {
        request.setCharacterEncoding("utf-8");
        response.setCharacterEncoding("utf-8");

        filterChain.doFilter(request,response);
    }

    @Override
    public void destroy() {

    }
}

web.jsp

<filter>
  <filter-name>encoding</filter-name>
  <filter-class>com.blue.filter.EncodingFilter</filter-class>
</filter>
<filter-mapping>
  <filter-name>encoding</filter-name>
  <url-pattern>/*</url-pattern>
</filter-mapping>

输入http://localhost:8080/form.jsp，输入，点击提交


大佬的过滤器

package com.kuang.filter;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.nio.charset.StandardCharsets;
import java.util.Map;

/**
 * 解决get和post请求 全部乱码的过滤器
 */
public class GenericEncodingFilter implements Filter {

    @Override
    public void destroy() {
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        // 处理response的字符编码
        HttpServletResponse myResponse = (HttpServletResponse) response;
        myResponse.setContentType("text/html;charset=UTF-8");

        // 转型为与协议相关对象
        HttpServletRequest httpServletRequest = (HttpServletRequest) request;
        // 对request包装增强
        HttpServletRequest myrequest = new MyRequest(httpServletRequest);
        chain.doFilter(myrequest, response);
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }

}

// 自定义request对象，HttpServletRequest的包装类
class MyRequest extends HttpServletRequestWrapper {

    private final HttpServletRequest request;
    // 是否编码的标记
    private boolean hasEncode;

    // 定义一个可以传入HttpServletRequest对象的构造函数，以便对其进行装饰
    public MyRequest(HttpServletRequest request) {
        super(request);// super必须写
        this.request = request;
    }

    // 对需要增强方法 进行覆盖
    @Override
    public Map getParameterMap() {
        // 先获得请求方式
        String method = request.getMethod();
        if (method.equalsIgnoreCase("post")) {
            // post请求
            try {
                // 处理post乱码
                request.setCharacterEncoding("utf-8");
                return request.getParameterMap();
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }
        } else if (method.equalsIgnoreCase("get")) {
            // get请求
            Map<String, String[]> parameterMap = request.getParameterMap();
            if (!hasEncode) { // 确保get手动编码逻辑只运行一次
                for (String parameterName : parameterMap.keySet()) {
                    String[] values = parameterMap.get(parameterName);
                    if (values != null) {
                        for (int i = 0; i < values.length; i++) {
                            // 处理get乱码
                            values[i] = new String(values[i]
                                    .getBytes(StandardCharsets.ISO_8859_1), StandardCharsets.UTF_8);
                        }
                    }
                }
                hasEncode = true;
            }
            return parameterMap;
        }
        return super.getParameterMap();
    }

    // 取一个值
    @Override
    public String getParameter(String name) {
        Map<String, String[]> parameterMap = getParameterMap();
        String[] values = parameterMap.get(name);
        if (values == null) {
            return null;
        }
        return values[0]; // 取回参数的第一个值
    }

    // 取所有值
    @Override
    public String[] getParameterValues(String name) {
        Map<String, String[]> parameterMap = getParameterMap();
        String[] values = parameterMap.get(name);
        return values;
    }
}
}

五、Json交互处理

5.1、Jackson Databind 导入依赖

<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
<dependency>
  <groupId>com.fasterxml.jackson.core</groupId>
  <artifactId>jackson-databind</artifactId>
  <version>2.13.1</version>
</dependency>

springmvc-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
  http://www.springframework.org/schema/beans/spring-beans.xsd
  http://www.springframework.org/schema/context
  https://www.springframework.org/schema/context/spring-context.xsd
  http://www.springframework.org/schema/mvc
  https://www.springframework.org/schema/mvc/spring-mvc.xsd">
    
    <!-- 自动扫描指定的包，下面所有注解类交给IOC容器管理 -->
    <context:component-scan base-package="org.example.controller"/>
    
    <!-- 视图解析器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
          id="internalResourceViewResolver">
        <!-- 前缀 -->
        <property name="prefix" value="/WEB-INF/jsp/" />
        <!-- 后缀 -->
        <property name="suffix" value=".jsp" />
    </bean>
    
    <!--    <bean name="/t1" class="com.blue.controller.ControllerTest1"/>-->

</beans>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
  version="4.0">

  <!--1.注册servlet-->
  <servlet>
    <servlet-name>SpringMVC</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <!--通过初始化参数指定SpringMVC配置文件的位置，进行关联-->
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:springmvc-servlet.xml</param-value>
    </init-param>
    <!-- 启动顺序，数字越小，启动越早 -->
    <load-on-startup>1</load-on-startup>
  </servlet>

  <!--所有请求都会被springmvc拦截 -->
  <servlet-mapping>
    <servlet-name>SpringMVC</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

  <filter>
    <filter-name>encoding</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>utf-8</param-value>
    </init-param>
  </filter>

  <filter-mapping>
    <filter-name>encoding</filter-name>
    <url-pattern>/</url-pattern>
  </filter-mapping>

</web-app>

User

package org.example.pojo;


import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
    private String name;
    private int age;
    private String sex;
}

UserController

package org.example.controller;

import org.example.pojo.User;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller
public class UserController {

    @RequestMapping("/j1")
    @ResponseBody   //它就不会走视图解析器，会直接返回一个字符串
    public String json1() throws JsonProcessingException {
        //创建一个jackson的对象映射器，用来解析数据
        ObjectMapper mapper = new ObjectMapper();
        //创建一个对象
        User user = new User("blue1号", 3, "女");
        //将我们的对象解析成为json格式
        String str = mapper.writeValueAsString(user);
        //由于@ResponseBody注解，这里会将str转成json格式返回；十分方便
        return str;
    }

}

结果：

5.2、解决json乱码问题

方法一

//produces:指定响应体返回类型和编码
@RequestMapping(value = "/json1",produces = "application/json;charset=utf-8")

方法二

在springmvc-servlet.xml中添加下面代码

<mvc:annotation-driven>
  <mvc:message-converters register-defaults="true">
    <bean class="org.springframework.http.converter.StringHttpMessageConverter">
      <constructor-arg value="UTF-8"/>
    </bean>
    <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
      <property name="objectMapper">
        <bean class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean">
          <property name="failOnEmptyBeans" value="false"/>
        </bean>
      </property>
    </bean>
  </mvc:message-converters>
</mvc:annotation-driven>

5.3、返回json字符串统一解决

1、返回多个对象

package com.blue.controller;

import com.blue.pojo.User;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import java.util.ArrayList;
import java.util.List;

//@Controller
@RestController //只返回字符串
    public class UserController {

        //produces:指定响应体返回类型和编码
        //    @RequestMapping(value = "/j1",produces = "application/json;charset=utf-8")
        @RequestMapping("/j1")
        //    @ResponseBody   //它就不会走视图解析器，会直接返回一个字符串
        public String json1() throws JsonProcessingException {
            //创建一个jackson的对象映射器，用来解析数据
            ObjectMapper mapper = new ObjectMapper();
            //创建一个对象
            User user = new User("blue1号", 3, "女");
            //将我们的对象解析成为json格式
            String str = mapper.writeValueAsString(user);
            //由于@ResponseBody注解，这里会将str转成json格式返回；十分方便
            return str;
        }

        @RequestMapping("/j2")
        public String json2() throws JsonProcessingException {
            //创建一个jackson的对象映射器，用来解析数据
            ObjectMapper mapper = new ObjectMapper();

            List<User> userList = new ArrayList<User>();

            User user1 = new User("blue1", 3, "女");
            User user2 = new User("blue1", 3, "女");
            User user3 = new User("blue1", 3, "女");
            User user4 = new User("blue1", 3, "女");

            userList.add(user1);
            userList.add(user2);
            userList.add(user3);
            userList.add(user4);

            String str = mapper.writeValueAsString(userList);

            return str;
        }

    }

2、默认时间戳

@RequestMapping("/j3")
public String json3() throws JsonProcessingException {

	ObjectMapper mapper = new ObjectMapper();
	Date date = new Date();
	return mapper.writeValueAsString(date);
}

3、纯java解决—时间戳

@RequestMapping("/j3")
public String json3() throws JsonProcessingException {

    ObjectMapper mapper = new ObjectMapper();
    Date date = new Date();
    
    // 自定义日期的格式
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    
    // ObjectMapper,时间解析后的默认格式为：Timestamp,时间戳
    return mapper.writeValueAsString(sdf.format(date));
}

4、不使用时间戳的方式

@RequestMapping("/j4")
public String json4() throws JsonProcessingException {

    ObjectMapper mapper = new ObjectMapper();
    //不使用 时间戳 的方式
    mapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS,false);
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    mapper.setDateFormat(sdf);
    
    Date date = new Date();
    
    // ObjectMapper,时间解析后的默认格式为：Timestamp,时间戳
    return mapper.writeValueAsString(date);
}

5、工具类

JsonUtils

package com.blue.utils;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;

import java.text.SimpleDateFormat;

public class JsonUtils {
    public static String getJson(Object object) {
        return getJson(object,"yyyy-MM-dd HH:mm:ss");
    }

    public static String getJson(Object object,String dateFormat) {
        ObjectMapper mapper = new ObjectMapper();
        //不使用时间差的方式
        mapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
        //自定义日期格式对象
        SimpleDateFormat sdf = new SimpleDateFormat(dateFormat);
        //指定日期格式
        mapper.setDateFormat(sdf);
        try {
            return mapper.writeValueAsString(object);
        } catch (JsonProcessingException e) {
            e.printStackTrace();
        }
        return null;
    }

}

@RequestMapping("/j5")
public String json5() throws JsonProcessingException {
    Date date = new Date();
    String json = JsonUtils.getJson(date);
    return json;
}

5.4、FastJson

fastjson.jar是阿里开发的一款专门用于Java开发的包，可以方便的实现json对象与JavaBean对象的转换，实现JavaBean对象与json字符串的转换，实现json对象与json字符串的转换。实现json的转换方法很多，最后的实现结果都是一样的。

package com.blue.controller;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.blue.pojo.User;

import java.util.ArrayList;
import java.util.List;

public class FastJsonDemo {
    public static void main(String[] args) {
        //创建一个对象
        User user1 = new User("秦疆1号", 3, "男");
        User user2 = new User("秦疆2号", 3, "男");
        User user3 = new User("秦疆3号", 3, "男");
        User user4 = new User("秦疆4号", 3, "男");
        List<User> list = new ArrayList<User>();
        list.add(user1);
        list.add(user2);
        list.add(user3);
        list.add(user4);

        System.out.println("*******Java对象 转 JSON字符串*******");
        String str1 = JSON.toJSONString(list);
        System.out.println("JSON.toJSONString(list)==>"+str1);
        String str2 = JSON.toJSONString(user1);
        System.out.println("JSON.toJSONString(user1)==>"+str2);

        System.out.println("\n****** JSON字符串 转 Java对象*******");
        User jp_user1=JSON.parseObject(str2,User.class);
        System.out.println("JSON.parseObject(str2,User.class)==>"+jp_user1);

        System.out.println("\n****** Java对象 转 JSON对象 ******");
        JSONObject jsonObject1 = (JSONObject) JSON.toJSON(user2);
        System.out.println("(JSONObject) JSON.toJSON(user2)==>"+jsonObject1.getString("name"));

        System.out.println("\n****** JSON对象 转 Java对象 ******");
        User to_java_user = JSON.toJavaObject(jsonObject1, User.class);
        System.out.println("JSON.toJavaObject(jsonObject1, User.class)==>"+to_java_user);
    }
}	

@RequestMapping("/j6")
public String json6() throws JsonProcessingException {

    List<User> userList = new ArrayList<User>();

    User user1 = new User("blue1", 3, "女");
    User user2 = new User("blue1", 3, "女");
    User user3 = new User("blue1", 3, "女");
    User user4 = new User("blue1", 3, "女");
    
    userList.add(user1);
    userList.add(user2);
    userList.add(user3);
    userList.add(user4);
    
    String str = JSON.toJSONString(userList);
    return str;
	}
}

六、SpringMVC:整合SSM

6.1、环境要求：

• IDEA
• MySQL 5.7.19(我用的8.0+)
• Tomcat 9
• Maven 3.6

要求：
需要熟练掌握MySQL数据库，Spring，JavaWeb及MyBatis知识，简单的前端知识；

6.2、创建数据库

CREATE DATABASE `ssmbuild`;

USE `ssmbuild`;

DROP TABLE IF EXISTS `books`;

CREATE TABLE `books` (
   `bookID` INT(10) NOT NULL AUTO_INCREMENT COMMENT '书id',
   `bookName` VARCHAR(100) NOT NULL COMMENT '书名',
   `bookCounts` INT(11) NOT NULL COMMENT '数量',
   `detail` VARCHAR(200) NOT NULL COMMENT '描述',
   KEY `bookID` (`bookID`)
 ) ENGINE=INNODB DEFAULT CHARSET=utf8

INSERT  INTO `books`(`bookID`,`bookName`,`bookCounts`,`detail`)VALUES
(1,'Java',1,'从入门到放弃'),
(2,'MySQL',10,'从删库到跑路'),
(3,'Linux',5,'从进门到进牢');

6.3、导入依赖

新建项目，导入依赖junit、mysql、c3p0、servlet、JSP 、Mybatis、Spring，连接数据库

1、pom文件依赖

<dependencies>
        <!--Junit-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <!--数据库驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.28</version>
        </dependency>
        <!-- 数据库连接池 -->
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.5</version>
        </dependency>
        
        <!--Servlet - JSP -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.2</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        
        <!--Mybatis-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.6</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.2</version>
        </dependency>
        
        <!--Spring-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.2.0.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.2.0.RELEASE</version>
        </dependency>
        
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.10</version>
        </dependency>
    </dependencies>

2、数据库

3、maven静态资源导出问题

<build>
  <resources>
    <resource>
      <directory>src/main/java</directory>
      <includes>
        <include>**/*.properties</include>
        <include>**/*.xml</include>
      </includes>
      <filtering>false</filtering>
    </resource>
    <resource>
      <directory>src/main/resources</directory>
      <includes>
        <include>**/*.properties</include>
        <include>**/*.xml</include>
      </includes>
      <filtering>false</filtering>
    </resource>
  </resources>
</build>

6.4、基本架构和配置文件

建立包结构

• com.kuang.pojo
• com.kuang.dao
• com.kuang.service
• com.kuang.controller

配置文件

• mybatis-config.xml
• applicationContext.xml
• database.properties

mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>

    <typeAliases>
        <package name="com.kuang.pojo"/>
    </typeAliases>
    
</configuration>

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.springframework.org/schema/beans
  http://www.springframework.org/schema/beans/spring-beans.xsd">

</beans>

database.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=true&useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=root

6.5、Mybatis层

实体类pojo层

字段和数据库内的一样

package com.kuang.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Books {

    private int bookID;
    private String bookName;
    private int bookCounts;
    private String detail;

}

接口dao层

BookMapper

package com.kuang.dao;

import com.kuang.pojo.Books;
import org.apache.ibatis.annotations.Param;

import java.util.List;

public interface BookMapper {

    // 增加一本书
    int addBook(Books books);

    // 删除一本书,booId和id不一样，所以用个注解转换
    int deleteBookById(@Param("bookId") int id);

    //更新一本书
    int updateBook(Books books);

    // 查询一本书
    Books queryBookById(@Param("bookId") int id);

    // 查询全部的书
    List<Books> queryAllBook();

}

BookMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.kuang.dao.BookMapper">
    
    <!--增加一个Book-->
    <insert id="addBook" parameterType="Books">
        insert into ssmbuild.books(bookName,bookCounts,detail)
        values (#{bookName}, #{bookCounts}, #{detail})
    </insert>
    
    <!--根据id删除一个Book-->
    <delete id="deleteBookById" parameterType="int">
        delete from ssmbuild.books where bookID=#{bookID}
    </delete>
    
    <!--更新Book-->
    <update id="updateBook" parameterType="Books">
        update ssmbuild.books
        set bookName = #{bookName},bookCounts = #{bookCounts},detail = #{detail}
        where bookID = #{bookID}
    </update>
    
    <!--根据id查询,返回一个Book-->
    <select id="queryBookById" resultType="Books">
        select * from ssmbuild.books
        where bookID = #{bookID}
    </select>
    
    <!--查询全部Book-->
    <select id="queryAllBook" resultType="Books">
        SELECT * from ssmbuild.books
    </select>

</mapper>

mybatis-config.xml
接口和mapper写完了，就要绑定到xml中

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    
    <!--  配置数据源，交给 Spring 去做  -->
    <typeAliases>
        <package name="com.kuang.pojo"/>
    </typeAliases>
    
    <mappers>
        <mapper class="com.kuang.dao.BookMapper"/>
    </mappers>

</configuration>

业务service层

BookService

package com.kuang.service;


import com.kuang.pojo.Books;

import java.util.List;

public interface BookService {

    // 增加一本书
    int addBook(Books books);

    // 删除一本书，不是dao层，所以不用加注解@Para("bookId")
    int deleteBookById(int id);

    //更新一本书
    int updateBook(Books books);

    // 查询一本书
    Books queryBookById(int id);

    // 查询全部的书
    List<Books> queryAllBook();

}

BookServiceImpl

package com.kuang.service;


import com.kuang.dao.BookMapper;
import com.kuang.pojo.Books;

import java.util.List;

public class BookServiceImpl implements BookService{

    // service调 dao层：组合Dao
    private BookMapper bookMapper;

    public void setBookMapper(BookMapper bookMapper) {
        this.bookMapper = bookMapper;
    }

    @Override
    public int addBook(Books books) {
        return bookMapper.addBook(books);
    }

    @Override
    public int deleteBookById(int id) {
        return bookMapper.deleteBookById(id);
    }

    @Override
    public int updateBook(Books books) {
        return bookMapper.updateBook(books);
    }

    @Override
    public Books queryBookById(int id) {
        return bookMapper.queryBookById(id);
    }

    @Override
    public List<Books> queryAllBook() {
        return bookMapper.queryAllBook();
    }
}

6.6、Spring层

spring-dao.xml
将这个上下午配置到之前applicationContext.xml的上下文

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        https://www.springframework.org/schema/context/spring-context.xsd">
    
    <!-- 配置整合mybatis -->
    <!-- 1.关联数据库文件 -->
    <context:property-placeholder location="classpath:database.properties"/>
    
    <!-- 2.数据库连接池 -->
    <!--数据库连接池
        dbcp 半自动化操作 不能自动连接
        c3p0 自动化操作（自动的加载配置文件 并且设置到对象里面）
    -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <!-- 配置连接池属性 -->
        <property name="driverClass" value="${jdbc.driver}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
        
        <!-- c3p0连接池的私有属性 -->
        <property name="maxPoolSize" value="30"/>
        <property name="minPoolSize" value="10"/>
        <!-- 关闭连接后不自动commit -->
        <property name="autoCommitOnClose" value="false"/>
        <!-- 获取连接超时时间 -->
        <property name="checkoutTimeout" value="10000"/>
        <!-- 当获取连接失败重试次数 -->
        <property name="acquireRetryAttempts" value="2"/>
    </bean>
    
    <!-- 3.配置SqlSessionFactory对象 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 注入数据库连接池 -->
        <property name="dataSource" ref="dataSource"/>
        <!-- 配置MyBaties全局配置文件:mybatis-config.xml -->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>
    
    <!-- 4.配置扫描Dao接口包，动态实现Dao接口注入到spring容器中 -->
    <!--解释 ：https://www.cnblogs.com/jpfss/p/7799806.html-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!-- 注入sqlSessionFactory -->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <!-- 给出需要扫描Dao接口包 -->
        <property name="basePackage" value="com.kuang.dao"/>
    </bean>

</beans>

spring-service.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
  http://www.springframework.org/schema/beans/spring-beans.xsd
  http://www.springframework.org/schema/context
  http://www.springframework.org/schema/context/spring-context.xsd">
    
    <!-- 1. 扫描service相关的bean -->
    <context:component-scan base-package="com.kuang.service" />
    
    <!--2. BookServiceImpl注入到IOC容器中-->
    <bean id="BookServiceImpl" class="com.kuang.service.BookServiceImpl">
        <property name="bookMapper" ref="bookMapper"/>
    </bean>
    
    <!-- 3. 配置事务管理器 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!-- 注入数据库连接池 -->
        <property name="dataSource" ref="dataSource" />
    </bean>

</beans>

若配置的上下文没有自动整合，可以手动导入

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
  http://www.springframework.org/schema/beans/spring-beans.xsd">

    <import resource="classpath:spring-dao.xml"/>
    <import resource="classpath:spring-service.xml"/>
    <import resource="classpath:spring-mvc.xml"/>
</beans>

6.7、SpringMVC层

增加web框架支持！
web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
  version="4.0">

  <!--DispatcherServlet-->
  <servlet>
    <servlet-name>springmvc</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <!--一定要注意:我们这里加载的是总的配置文件，之前被这里坑了！-->
      <param-value>classpath:applicationContext.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

  <!--乱码过滤 encodingFilter-->
  <filter>
    <filter-name>encodingFilter</filter-name>
    <filter-class>
      org.springframework.web.filter.CharacterEncodingFilter
    </filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>utf-8</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>encodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

  <!--Session过期时间-->
  <session-config>
    <session-timeout>15</session-timeout>
  </session-config>

</web-app>

spring-mvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:context="http://www.springframework.org/schema/context"
  xmlns:mvc="http://www.springframework.org/schema/mvc"
  xsi:schemaLocation="http://www.springframework.org/schema/beans
  http://www.springframework.org/schema/beans/spring-beans.xsd
  http://www.springframework.org/schema/context
  http://www.springframework.org/schema/context/spring-context.xsd
  http://www.springframework.org/schema/mvc
  https://www.springframework.org/schema/mvc/spring-mvc.xsd">

  <!-- 配置SpringMVC -->
  <!-- 1.开启SpringMVC注解驱动 -->
  <mvc:annotation-driven />
  <!-- 2.静态资源默认servlet配置-->
  <mvc:default-servlet-handler/>

  <!-- 3.配置jsp 显示ViewResolver视图解析器 -->
  <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
    <property name="prefix" value="/WEB-INF/jsp/" />
    <property name="suffix" value=".jsp" />
  </bean>

  <!-- 4.扫描web相关的bean -->
  <context:component-scan base-package="com.kuang.controller" />

</beans>

BookController

package com.kuang.controller;

import com.kuang.pojo.Books;
import com.kuang.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import java.util.List;

@Controller
@RequestMapping("/book")
public class BookController {

    @Autowired
    @Qualifier("BookServiceImpl")
    private BookService bookService;

    @RequestMapping("/allBook")
    public String list(Model model) {
        List<Books> list = bookService.queryAllBook();
        model.addAttribute("list", list);
        return "allBook";
    }
}

allBook.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
  <html>
    <head>
      <title>书籍展示</title>
    </head>
    <body>
      <h1>书籍展示</h1>
    </body>
  </html>

index.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
  <title>首页</title>
</head>
<body>

<h3>
  <a href="${pageContext.request.contextPath}/book/allBook">进入书籍页面</a>
</h3>

</body>
</html>

排错思路

问题：启动不了，工件 ssmbuild:war exploded: 部署工件时出错。请参阅服务器日志了解详细信息。

wen-inf下建立 lib，中加maven静态资源

问题：bean不存在（500）

步骤：
1、查看这个bean注入是否成功！
2、Junit单元测试，看我们的代码是否能够查询出来结果！

import com.kuang.pojo.Books;
import com.kuang.service.BookService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MyTest {
    @Test
    public void test(){
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        BookService bookServiceImpl = (BookService) context.getBean("BookServiceImpl");

        for (Books books:bookServiceImpl.queryAllBook()){
            System.out.println(books);
        }

    }
}

3、问题，一定不在我们的底层，是spring出了问题！
4、SpringMVC，整合的时候没调用到我们的service.层的bean

• applicationContext.xml没有注入bean
• web.xml中，我们也绑定过配置文件！发现问题，我们配置的是Spring-mvc.Xml这里面确实没有service bean,所以报空指针
• 所以，在web.xml中<param-value>classpath:applicationContext.xml</param-value>而不是<param-value>classpath:spring-mvc.xml</param-value>

6.8、查询书籍

index.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
  <html>
    <head>
      <title>首页</title>
      <style>
        a{
          text-decoration: none;
          color: blue;
          font-size: 18px;
        }
        h3{
          width: 180px;
          height: 38px;
          margin: 100px auto;
          text-align: center;
          line-height: 38px;
          background: deepskyblue;
          border-radius: 5px;
        }
      </style>

    </head>
    <body>

      <h3>
        <a href="${pageContext.request.contextPath}/book/allBook">进入书籍页面</a>
      </h3>

    </body>
  </html>

查找BootStrap CDN，搜索

<!-- 新 Bootstrap 核心 CSS 文件 -->

<link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">

<!-- jQuery文件。务必在bootstrap.min.js 之前引入 -->

<script src="https://cdn.staticfile.org/jquery/2.1.1/jquery.min.js"></script>

<!-- 最新的 Bootstrap 核心 JavaScript 文件 -->

<script src="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>

allbook.jsp

• 先导入<%@ taglib prefix=“c” uri=“http://java.sun.com/jsp/jstl/core” %>，放第一行

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
  <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
      <head>
        <title>书籍展示</title>

        <!-- 新 Bootstrap 核心 CSS 文件 -->

        <link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">

        <!-- jQuery文件。务必在bootstrap.min.js 之前引入 -->

        <script src="https://cdn.staticfile.org/jquery/2.1.1/jquery.min.js"></script>

        <!-- 最新的 Bootstrap 核心 JavaScript 文件 -->

        <script src="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>
      </head>
      <body>

        <div class="container">

          <div class="row clearfix">
            <div class="col-md-12 column">
              <div class="page-header">
                <h1>
                  <small>书籍列表 —— 显示所有书籍</small>
                </h1>
              </div>
            </div>
          </div>

          <div class="row clearfix">
            <div class="col-md-12 column">
              <table class="table table-hover table-striped">
                <thead>
                  <tr>
                    <th>书籍编号</th>
                    <th>书籍名字</th>
                    <th>书籍数量</th>
                    <th>书籍详情</th>
                    <th>操作</th>
                  </tr>
                </thead>

                <%-- 书籍从数据库中查询出来，从这个List中遍历出来：foreach --%>
                  <tbody>
                    <%--                <c:forEach var="book" items="${requestScope.get('list')}">--%>
                      <c:forEach var="book" items="${requestScope.get('list')}">
                        <tr>
                          <td>${book.getBookID()}</td>
                          <td>${book.getBookName()}</td>
                          <td>${book.getBookCounts()}</td>
                          <td>${book.getDetail()}</td>
                        </tr>
                      </c:forEach>
                    </tbody>
                    </table>
                    </div>
                    </div>


                    </div>



                    </body>
                    </html>

6.9、添加书籍

allBook.jsp

<div class="row">
  <div class="col-md-4 column">
    <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/toAddBook">新增书籍</a>
  </div>
</div>

BookController.java

// 跳转到增加书籍页面
@RequestMapping("/toAddBook")
    public String toAddPaper(){
    return "addBook";
}

// 添加书籍
@RequestMapping("/addBook")
public String addBook(Books books){
    System.out.println("addBook=>"+books);
    bookService.addBook(books);
    return "redirect:/book/allBook";
}

addBook.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
  <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
      <head>
        <title>书籍展示</title>

        <%--  BootStrap美化界面  --%>
          <link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
      </head>
      <body>

        <div class="container">

          <div class="row clearfix">
            <div class="col-md-12 column">
              <div class="page-header">
                <h1>
                  <small>新增书籍</small>
                </h1>
              </div>
            </div>
          </div>

          <form action="${pageContext.request.contextPath}/book/addBook" method="post">
            <div class="form-group">
              <label>书籍名称</label>
              <input type="text" name="bookName" class="form-control" required>
            </div>
            <div class="form-group">
              <label>书籍数量</label>
              <input type="text" name="bookCounts" class="form-control" required>
            </div>
            <div class="form-group">
              <label>书籍描述</label>
              <input type="text" name="detail" class="form-control" required>
            </div>
            <div class="form-group">
              <input type="submit" class="form-control" value="添加">
            </div>

          </form>

        </div>

      </body>
    </html>

结果

6.10、修改书籍

allBook.jsp

<tbody>
  <c:forEach var="book" items="${requestScope.get('list')}">
    <tr>
      <td>${book.getBookID()}</td>
      <td>${book.getBookName()}</td>
      <td>${book.getBookCounts()}</td>
      <td>${book.getDetail()}</td>
      <td>
        <a href="${pageContext.request.contextPath}/book/toUpdateBook?id=${book.getBookID()}">修改</a> |

      </td>
    </tr>
  </c:forEach>
</tbody>

BookController.java

//修改书籍
@RequestMapping("/updateBook")
public String updateBook( Books books) {
    System.out.println("updateBook=>"+books);
    int i =bookService.updateBook(books);
    if (i > 0) {
        System.out.println("添加books成功"+books);
    }
    return "redirect:/book/allBook";
}

updateBook.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>修改书籍信息</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <!-- 引入 Bootstrap -->
    <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<div class="container">
    
    <div class="row clearfix">
        <div class="col-md-12 column">
            <div class="page-header">
                <h1>
                    <small>修改书籍</small>
                </h1>
            </div>
        </div>
    </div>
    
    <form action="${pageContext.request.contextPath}/book/" method="post">
        <div class="form-group">
            <label>书籍名称</label>
            <input type="text" name="bookName" class="form-control" value="${QBook.bookName}" required>
        </div>
        <div class="form-group">
            <label>书籍数量</label>
            <input type="text" name="bookCounts" class="form-control" value="${QBook.bookCounts}" required>
        </div>
        <div class="form-group">
            <label>书籍描述</label>
            <input type="text" name="detail" class="form-control" value="${QBook.detail}" required>
        </div>
        <div class="form-group">
            <input type="submit" class="form-control" value="修改">
        </div>
        <%--        <input type="submit" value="提交"/>--%>
    </form>

</div>

结果

BookController

@RequestMapping("/updateBook")
public String updateBook( Books books) {
    System.out.println("updateBook=>"+books);
    bookService.updateBook(books);
    return "redirect:/book/allBook";
}

BookServiceImpl

@Override
    public int updateBook(Books books) {
        System.out.println("BookServiceImpl:updateBook=>"+books);
return bookMapper.updateBook(books);
}

导入jar包

<dependency>
    <groupId>org.aspectj</groupId>
    <artifactId>aspectjweaver</artifactId>
    <version>1.9.4</version>
</dependency>

加上事务
spring-service.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:context="http://www.springframework.org/schema/context"
  xmlns:aop="http://www.springframework.org/schema/aop"
  xmlns:tx="http://www.springframework.org/schema/tx"
  xsi:schemaLocation="http://www.springframework.org/schema/beans
  http://www.springframework.org/schema/beans/spring-beans.xsd
  http://www.springframework.org/schema/context
  http://www.springframework.org/schema/context/spring-context.xsd
  http://www.springframework.org/schema/aop
  http://www.springframework.org/schema/aop/spring-aop.xsd
  http://www.springframework.org/schema/tx
  http://www.springframework.org/schema/tx/spring-tx.xsd">

  <!-- 扫描service相关的bean -->
  <context:component-scan base-package="com.kuang.service" />

  <!--BookServiceImpl注入到IOC容器中-->
  <bean id="BookServiceImpl" class="com.kuang.service.BookServiceImpl">
    <property name="bookMapper" ref="bookMapper"/>
  </bean>

  <!-- 配置事务管理器 -->
  <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <!-- 注入数据库连接池 -->
    <property name="dataSource" ref="dataSource" />
  </bean>

  <!--  结合AOP实现事务的织入  -->
  <!-- 配置事务通知 -->
  <tx:advice id="txAdvice" transaction-manager="transactionManager">
    <tx:attributes>
      <tx:method name="*" propagation="REQUIRED"/>
    </tx:attributes>
  </tx:advice>

  <!--  配置事务切入  -->
  <aop:config>
    <aop:pointcut id="txPointCut" expression="execution(* com.kuang.dao.*.*(..))"/>
    <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointCut"/>
  </aop:config>

</beans>

lib包导入
updateBook.jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
  <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
      <head>
        <title>修改书籍信息</title>
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <!-- 引入 Bootstrap -->
        <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
      </head>
      <body>
        <div class="container">

          <div class="row clearfix">
            <div class="col-md-12 column">
              <div class="page-header">
                <h1>
                  <small>修改书籍</small>
                </h1>
              </div>
            </div>
          </div>

          <%--  出现的问题：我们提交了修改的SQ请求，但是修改失败，初次考虑，是事务问题，配置完华事务，依旧失败！--%>
            <%-- 看一下SQL语句，能否执行成功：SQL执行失败，修政未完成-%>  &ndash;%&gt;--%>
              <form action="${pageContext.request.contextPath}/book/updateBook" method="post">
                <input type="hidden" name="bookID" value="${QBook.bookID}">
                <div class="form-group">
                  <label>书籍名称</label>
                  <input type="text" name="bookName" class="form-control" value="${QBook.bookName}" required>
                </div>
                <div class="form-group">
                  <label>书籍数量</label>
                  <input type="text" name="bookCounts" class="form-control" value="${QBook.bookCounts}" required>
                </div>
                <div class="form-group">
                  <label>书籍描述</label>
                  <input type="text" name="detail" class="form-control" value="${QBook.detail}" required>
                </div>
                <div class="form-group">
                  <input type="submit" class="form-control" value="修改">
                </div>
                <%--        <input type="submit" value="提交"/>--%>
              </form>

            </div>

手动添加日志
mybatis-config.xml

6.11、删除书籍

//删除书籍
@RequestMapping("/deleteBook")
    public String deleteBook(int id){
    bookService.deleteBookById(id);
    return "redirect:/book/allBook";
}

allBook.jsp

<td>
  <a href="${pageContext.request.contextPath}/book/toUpdateBook?id=${book.getBookID()}">修改</a> |
  <a href="${pageContext.request.contextPath}/book/del/${book.getBookID()}">删除</a>
</td>

6.12、查询书籍

BookMapper

Books queryBookByName(String bookName);

BookMapper.xml

<select id="queryBookByName" resultType="Books">
  select * from ssmbuild.books where bookName = #{bookName}
</select>

BookService

Books queryBookByName(String bookName);

BookServiceImpl

@Override
public Books queryBookByName(String bookName) {
    return bookMapper.queryBookByName(bookName);
}

BookController

//查询书籍
@RequestMapping("/queryBook")
public String queryBook(String queryBookName,Model model){
    Books books = bookService.queryBookByName(queryBookName);
    System.err.println("books=>"+books);
    List<Books> list = new ArrayList<Books>();
    list.add(books);
    model.addAttribute("list",list);
    return "allBook";
}

addBook.jsp

<div class="row">
  <div class="col-md-4 column">
    <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/toAddBook">新增书籍</a>
  </div>
  <div class="col-md-4 column">
    <%-- 查询书籍--%>
      <form action="${pageContext.request.contextPath}/book/queryBook" method="post" style="float: right">
        <input type="text" name="queryBookName" class="form-control" placeholder="请输入要查询书籍的名称">
        <input type="submit" value="查询" class="btn btn-primary">
      </form>
  </div>
</div>

结果

报500错误，dao.BookMapper.xml查不到
加上maven资源过滤

<build>
  <resources>
    <resource>
      <directory>src/main/java</directory>
      <includes>
        <include>**/*.properties</include>
        <include>**/*.xml</include>
      </includes>
      <filtering>false</filtering>
    </resource>
    <resource>
      <directory>src/main/resources</directory>
      <includes>
        <include>**/*.properties</include>
        <include>**/*.xml</include>
      </includes>
      <filtering>false</filtering>
    </resource>
  </resources>
</build>

6.13、显示全部书籍

allBook.jsp

<div class="row">
  <div class="col-md-4 column">
    <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/toAddBook">新增书籍</a>
    <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/allBook">显示全部书籍</a>
  </div>
  <div class="col-md-8 column">
    <%-- 查询书籍--%>
      <form class="form-inline" action="${pageContext.request.contextPath}/book/queryBook" method="post" style="float: right">
        <span style="color:red; font-weight: bold">${error}</span>
        <input type="text" name="queryBookName" class="form-control" placeholder="请输入要查询书籍的名称">
        <input type="submit" value="查询" class="btn btn-primary">
      </form>
  </div>
</div>

BookController

//查询书籍
@RequestMapping("/queryBook")
public String queryBook(String queryBookName,Model model){
    Books books = bookService.queryBookByName(queryBookName);
    System.err.println("books=>"+books);
    List<Books> list = new ArrayList<Books>();
    list.add(books);

    if (books == null){
        list = bookService.queryAllBook();
        model.addAttribute("error","未查到");
    }

    model.addAttribute("list",list);
    return "allBook";
}

结果

七、Ajax研究

模块

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
  version="4.0">

  <!--1.注册servlet-->
  <servlet>
    <servlet-name>SpringMVC</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <!--通过初始化参数指定SpringMVC配置文件的位置，进行关联-->
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:applicationContext.xml</param-value>
    </init-param>
    <!-- 启动顺序，数字越小，启动越早 -->
    <load-on-startup>1</load-on-startup>
  </servlet>

  <!--所有请求都会被springmvc拦截 -->
  <servlet-mapping>
    <servlet-name>SpringMVC</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

  <filter>
    <filter-name>encoding</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>utf-8</param-value>
    </init-param>
  </filter>

  <filter-mapping>
    <filter-name>encoding</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

</web-app>

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:context="http://www.springframework.org/schema/context"
  xmlns:mvc="http://www.springframework.org/schema/mvc"
  xsi:schemaLocation="http://www.springframework.org/schema/beans
  http://www.springframework.org/schema/beans/spring-beans.xsd
  http://www.springframework.org/schema/context
  https://www.springframework.org/schema/context/spring-context.xsd
  http://www.springframework.org/schema/mvc
  https://www.springframework.org/schema/mvc/spring-mvc.xsd">

  <!-- 自动扫描指定的包，下面所有注解类交给IOC容器管理 -->
  <context:component-scan base-package="com.blue.controller"/>
  <!-- 静态资源过滤 -->
  <mvc:default-servlet-handler />
  <mvc:annotation-driven/>
  <!-- 视图解析器 -->
  <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
    id="internalResourceViewResolver">
    <!-- 前缀 -->
    <property name="prefix" value="/WEB-INF/jsp/" />
    <!-- 后缀 -->
    <property name="suffix" value=".jsp" />
  </bean>

  <!--    <bean name="/t1" class="com.blue.controller.ControllerTest1"/>-->

</beans>

AjaxController

package com.blue.controller;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class AjaxController {
    @RequestMapping("/t1")
    public String test(){
        return "hello";
    }
}

结果：

页面无刷新效果

test.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <title>iframe测试体验页面无刷新</title>

    <script>
      function go(){
        var url = document.getElementById("url").value;
        document.getElementById("iframe1").src=url;

      }
    </script>

  </head>
  <body>

    <div>
      <p>请输入地址：</p>
      <p>
        <input type="text" id="url" value="https://www.bilibili.com/">
        <input type="button" value="提交" onclick="go()">
      </p>
    </div>

    <div>
      <iframe id="iframe1" style="width: 100%;height: 500px"></iframe>
    </div>

  </body>
</html>

因为没用到，所以博主没看完，抱歉(。・＿・。)ﾉI’m sorry~

八、拦截器

8.1、拦截器的true与false

模块

拷过来

main.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
  <html>
    <head>
      <title>Title</title>
    </head>
    <body>
      <h1>首页</h1>
    </body>
  </html>

login.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
  <html>
    <head>
      <title>Title</title>
    </head>
    <body>
      <h1>登录页面</h1>
      <form action="${pageContext.request.contextPath}/user/login" method="post">
        用户名：<input type="text" name="username"/>

        密码：<input type="text" name="password"/>
        <input type="submit" value="提交">
      </form>
    </body>
  </html>

TestController

package com.blue.controller;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class TestController {

    @GetMapping("/t1")
    public String test(){
        System.out.println("TestController==> test()执行了");
        return "OK";
    }
}

HandlerInterceptor

package com.blue.config;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class MyInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("================处理前===============");
        return true;
        //        return HandlerInterceptor.super.preHandle(request, response, handler);
    }


    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("================处理后===============");
        //        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("================清理===============");
        //        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}

applicationContext.xml

<!--拦截器配置-->
<mvc:interceptors>
  <mvc:interceptor>
    <mvc:mapping path="/**"/>
    <bean class="com.blue.config.MyInterceptor"/>
  </mvc:interceptor>
</mvc:interceptors>

结果：
拦截器为false

public class MyInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("================处理前===============");
        return false;
        //        return HandlerInterceptor.super.preHandle(request, response, handler);
    }
}

结果

首页----登录页面，

LoginController

package com.blue.controller;


import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpSession;

@Controller
@RequestMapping("/user")
public class LoginController {
    //跳转到登陆页面
    @RequestMapping("/jumplogin")
    public String jumpLogin() throws Exception {
        return "login";
    }

    //跳转到成功页面
    @RequestMapping("/jumpSuccess")
    public String jumpSuccess() throws Exception {
        return "success";
    }

    //登陆提交
    @RequestMapping("/login")
    public String login(HttpSession session, String username, String pwd) throws Exception {
        // 向session记录用户身份信息
        System.out.println("接收前端==="+username);
        session.setAttribute("user", username);
        return "success";
    }

    //退出登陆
    @RequestMapping("logout")
    public String logout(HttpSession session) throws Exception {
        // session 过期
        session.invalidate();
        return "login";
    }
}

index.jsp

<%--
  Created by IntelliJ IDEA.
  User: dlmu
  Date: 2022/4/23
  Time: 9:59
  To change this template use File | Settings | File Templates.
  --%>
  <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
      <head>
        <title>$Title$</title>
      </head>
      <body>
        <h1><a href="${pageContext.request.contextPath}/goLogin"></a></h1>
        <h1><a href="${pageContext.request.contextPath}/main"></a></h1>
      </body>
    </html>

拦截器

LoginInterceptor

package com.blue.config;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

public class LoginInterceptor implements HandlerInterceptor {
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws ServletException, IOException {
        // 如果是登陆页面则放行
        //        System.out.println("uri: " + request.getRequestURI());
        if (request.getRequestURI().contains("goLogin")) {
            return true;
        }

        HttpSession session = request.getSession();

        // 如果用户已登陆也放行
        if(session.getAttribute("user") != null) {
            return true;
        }

        // 用户没有登陆跳转到登陆页面
        request.getRequestDispatcher("/WEB-INF/jsp/login.jsp").forward(request, response);
        return false;
    }

    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception {

    }

    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception {

    }
}

applicationContext.xml

<!--拦截器配置-->
<mvc:interceptors>
  <mvc:interceptor>
    <mvc:mapping path="/**"/>
    <bean class="com.blue.config.MyInterceptor"/>
  </mvc:interceptor>
  <mvc:interceptor>
    <mvc:mapping path="/**"/>
    <bean class="com.blue.config.LoginInterceptor"/>
  </mvc:interceptor>
</mvc:interceptors>

登录页面登录

LoginInterceptor

package com.blue.config;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

public class LoginInterceptor implements HandlerInterceptor {
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws ServletException, IOException {
        // 如果是登陆页面则放行
        if (request.getRequestURI().contains("goLogin")) {
            return true;
        }
        if (request.getRequestURI().contains("login")) {
            return true;
        }

        HttpSession session = request.getSession();

        // 如果用户已登陆也放行 第一次登录，也是没有session的：
        if(session.getAttribute("userLoginInfo") != null) {
            return true;
        }

        // 用户没有登陆跳转到登陆页面
        request.getRequestDispatcher("/WEB-INF/jsp/login.jsp").forward(request, response);
        return false;
    }

LoginController

package com.blue.controller;


import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpSession;

@Controller
@RequestMapping("/user")
public class LoginController {

    @RequestMapping("/main")
    public String main(){
        return "main";
    }
    @RequestMapping("/goLogin")
    public String login(){
        return "login";
    }

    //登陆提交
    @RequestMapping("/login")
    public String login(HttpSession session, String username, String pwd, Model model){
        // 向session记录用户身份信息
        System.out.println("接收前端login==="+username);
        session.setAttribute("userLoginInfo", username);
        model.addAttribute("username",username);
        return "main";
    }

    //退出登陆
    @RequestMapping("/goOut")
    public String logout(HttpSession session){
        // session 过期
        //        session.invalidate();
        session.removeAttribute("userLoginInfo");
        return "main";

    }
}                                                                                                                             43

main.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
  <html>
    <head>
      <title>Title</title>
    </head>
    <body>
      <h1>首页</h1>

      <span>${username}</span>

      <p>
        <a href="${pageContext.request.contextPath}/user/goOut">注销</a>
      </p>
    </body>
  </html>