SpringMVC轻松学习-注解的使用（三）

我们采用sprng MVC开发项目时，通常都会采用注解的方式，这样可以大大提高我们的开发效率。实现零配置。下面我们从零开始重新做一个spring MVC的配置。这个项目完全采用注解的方式开发。同时，我们以后的spring MVC项目也都会采用注解的方式。

修改web.xml，文件内容如下：

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>
            org.springframework.web.servlet.DispatcherServlet
</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/hib-config.xml,/WEB-INF/springmvc-servlet.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>

<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>

</web-app>

springmvc-servlet.xml配置内容如下：

<?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:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/context 
http://www.springframework.org/schema/context/spring-context-2.5.xsd">

<!-- 对web包中的所有类进行扫描，以完成Bean创建和自动依赖注入的功能 -->
<context:component-scan base-package="com.sxt"/>

<!-- 启动Spring MVC的注解功能，完成请求和注解POJO的映射 -->
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"/>

<!--对模型视图名称的解析，即在模型视图名称添加前后缀 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
p:suffix=".jsp"/>
</beans>

hib-config.xml(配置了spring集成hibernate)

<?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:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="
http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-2.5.xsd
http://www.springframework.org/schema/aop 
http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
http://www.springframework.org/schema/context   
http://www.springframework.org/schema/context/spring-context-2.5.xsd
">
<context:component-scan  base-package="com.sxt"/>   
<!-- 支持aop注解 -->
<aop:aspectj-autoproxy />


<bean id="dataSource" 
class="org.apache.commons.dbcp.BasicDataSource">  
<property name="driverClassName" 
value="com.mysql.jdbc.Driver">  
</property>  
<property name="url" value="jdbc:mysql://localhost:3306/myhib"></property>  
<property name="username" value="root"></property>  
<property name="password" value="123456"></property>
</bean>  

<bean id="sessionFactory" 
class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">  
<property name="dataSource">  
<ref bean="dataSource" />  
</property>
<property name="hibernateProperties">  
<props>  
<!-- key的名字前面都要加hibernate. -->
<prop key="hibernate.dialect">  
                       org.hibernate.dialect.MySQLDialect  
</prop>  
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.hbm2ddl.auto">update</prop>
</props>
</property>
<property name="packagesToScan">
<value>com.sxt.po</value>
</property>
</bean>  

<bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate" >
<property name="sessionFactory" ref="sessionFactory"></property>
</bean>

<!--配置一个JdbcTemplate实例--> 
<bean id="jdbcTemplate"  class="org.springframework.jdbc.core.JdbcTemplate">   
<property name="dataSource" ref="dataSource"/>   
</bean>  


<!-- 配置事务管理 -->
<bean id="txManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager" >
<property name="sessionFactory" ref="sessionFactory"></property>
</bean>
<tx:annotation-driven transaction-manager="txManager" />
<aop:config> 
<aop:pointcut expression="execution(public * com.sxt.service.impl.*.*(..))" id="businessService"/> 
<aop:advisor advice-ref="txAdvice" pointcut-ref="businessService" /> 
</aop:config> 
<tx:advice id="txAdvice" transaction-manager="txManager" > 
<tx:attributes> 
<tx:method name="find*"  read-only="true" propagation="NOT_SUPPORTED"  /> 
<!-- get开头的方法不需要在事务中运行 。 
有些情况是没有必要使用事务的，比如获取数据。开启事务本身对性能是有一定的影响的-->
<tx:method name="*"/>    <!-- 其他方法在实务中运行 -->
</tx:attributes> 
</tx:advice> 

</beans>

reg.jsp如下

<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">   
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>

<body>
<form action="user.do">
  用户名：<input type=text name=uname /><br/>
<input type=hidden name=method value=reg />
<input type=submit value=注册 />
</form>
</body>
</html>

index.jsp 如下：

<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">    
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>

<body>
<h1>**********${params.uname}</h1>
<h1>**********${requestScope.u}</h1>
<h1>**********${requestScope.user}</h1>
</body>
</html>

User.java

package com.sxt.po;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity
public class User {
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private int id;
    private String uname;
    private String pwd;


    public String getPwd() {
        return pwd;
    }
    public void setPwd(String pwd) {
        this.pwd = pwd;
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getUname() {
        return uname;
    }
    public void setUname(String uname) {
        this.uname = uname;
    }


}

UserDao.java

package com.sxt.dao;

import javax.annotation.Resource;

import org.springframework.orm.hibernate3.HibernateTemplate;
import org.springframework.stereotype.Repository;

import com.sxt.po.User;

@Repository("userDao")
public class UserDao {
    @Resource
    private HibernateTemplate hibernateTemplate;

    public void add(User u){
        System.out.println("UserDao.add()");
        hibernateTemplate.save(u);
    }

    public HibernateTemplate getHibernateTemplate() {
        return hibernateTemplate;
    }

    public void setHibernateTemplate(HibernateTemplate hibernateTemplate) {
        this.hibernateTemplate = hibernateTemplate;
    }

}

UserService.Java

package com.sxt.service;

import javax.annotation.Resource;

import org.springframework.stereotype.Service;

import com.sxt.dao.UserDao;
import com.sxt.po.User;

@Service("userService")
public class UserService {
    @Resource
    private UserDao userDao;

    public void add(String uname){
        System.out.println("UserService.add()");
        User u = new User();
        u.setUname(uname);
        userDao.add(u);
    }

    public UserDao getUserDao() {
        return userDao;
    }

    public void setUserDao(UserDao userDao) {
        this.userDao = userDao;
    }

}

UserController.java

package com.sxt.web;

import javax.annotation.Resource;

import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.SessionAttributes;

import com.sxt.po.User;
import com.sxt.service.UserService;


@Controller("userController")//这里的
@RequestMapping("/user.do")     
public class UserController  {

    @Resource
    private UserService userService;

    @RequestMapping(params="method=reg") 
    public String reg(String uname) {
        System.out.println("HelloController.handleRequest()");
        userService.add(uname); 
        return "index";
    }

    public UserService getUserService() {
        return userService;
    }

    public void setUserService(UserService userService) {
        this.userService = userService;
    }


}

说明：

@Controller("userController")这里也可以使用component进行注解，这里的controller和component一样，但是一般不用component，而这样的注解还@Repository、@Service、@Controller大家估计都知道怎么使用了
@RequestMapping("/user.do") 注解说明：这个注解是页面提交到user.dao中进行操作的controller，之前我们的controller还需要进行实现controller接口，而现在不需要实现此接口了，而且controller里面的函数也不需要去复写handleRequest方法了，这里我们就可以自己写自己的方法了，但是我们怎么知道页面提交给那个方法了呢？
@RequestMapping(params="method=reg")说明：这个注解就是去解释页面提交的给了那个方法的，就是提交来的带有method=reg的就会调转到此方法中,我们上面的页面中是这样定义传值的<input type=hidden name=method value=reg />
问题又来啦，struts2中我们是根据属性的set和get方法得到我们传递来的值得，这里怎么办呢？我们在controller方法中添加参数将传递的值传递来，public String reg(String uname) 这里的命名必须和页面传来的对应上。

上面的controller中，我们传递的是uname，我们这样呢，将参数改成User user为public String reg(User user)

@RequestMapping(params="method=reg2")
   public String reg(User user) {
       System.out.println("HelloController.handleRequest()");
       userService.add(user.getUname());
       return "index";

说明：这里呢其实是将User模型中的属性拿来用了，我们必须保证页面定义的名称和模型中的一样才行，这一点类此与struts2里面的模型驱动

作者：少帅

您的支持是对博主最大的鼓励，感谢您的认真阅读。

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SpringMVC轻松学习-注解的使用（三）

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