spring 开始构造

时间：2021-08-27 20:22:42

spring 开始构造

1，选择“org.apache.maven.archetypes:maven-archetype-webapp”骨架（模板），创建一个Web项目：

在main 目录下创建文件夹  java,  resources   mark as:

spring 开始构造

添加依赖：

<properties>

    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

    <maven.compiler.source>1.7</maven.compiler.source>

    <maven.compiler.target>1.7</maven.compiler.target>

    <spring.version>4.3.0.RELEASE</spring.version>

  </properties>

  <dependencies>

    <dependency>

      <groupId>junit</groupId>

      <artifactId>junit</artifactId>

      <version>4.11</version>

      <scope>test</scope>

    </dependency>

    <!--Spring框架核心库 -->

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-context</artifactId>

      <version>${spring.version}</version>

    </dependency>

    <!-- Spring MVC -->

    <dependency>

      <groupId>org.springframework</groupId>

      <artifactId>spring-webmvc</artifactId>

      <version>${spring.version}</version>

    </dependency>

    <!-- JSTL -->

    <dependency>

      <groupId>javax.servlet</groupId>

      <artifactId>jstl</artifactId>

      <version>1.2</version>

    </dependency>

  </dependencies>

WEB-INF下有web.xml 文件：

修改web.xml注册中心控制器DispatcherServlet

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

         xmlns="http://java.sun.com/xml/ns/javaee"

         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"

         id="WebApp_ID" version="3.0">

  <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>

添加Spring MVC配置文件：resources 目录下 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 http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">
 <!-- Spring MVC不处理静态资源 -->
<context:component-scan base-package="com.ljs.springmvc01"></context:component-scan> 
　　
 <!-- Spring MVC不处理静态资源 -->
<mvc:default-servlet-handler></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></mvc:annotation-driven>

<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="internalResourceViewResolver"> 

　　　　<property name="prefix" value="/WEB-INF/view/"></property>

　　 　　<property name="suffix" value=".jsp"></property>

 </bean>

 </beans>

创控制器

@Controller

@RequestMapping("/hello")

public class HelloWorld {

    @RequestMapping("/hi")

    public String hi(Model model){

        model.addAttribute("msg","hello spring mvc");

        return "hi";

    }

}

　　

创建视图

在WEB-INF/view目录中创建视图，hi.jsp视图将从Action中带回的信息展示，

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

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<html>

<head>

    <title>Title</title>

</head>

<body>

    <h2>${msg}</h2>

</body>

</html>

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