源代码

一、<mvc:annotation-driven/>

<mvc:annotation-driven/>可以帮助自动创建注解处理器映射器RequestMappingHandlermapping，注解处理器适配器RequestMappingHandlerAdapter。提供对json格式的支持。

在springmvc.xml文件中配置

<?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:mvc="http://www.springframework.org/schema/mvc"
	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-3.2.xsd 
		http://www.springframework.org/schema/mvc 
		http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd 
		http://www.springframework.org/schema/context 
		http://www.springframework.org/schema/context/spring-context-3.2.xsd 
		http://www.springframework.org/schema/aop 
		http://www.springframework.org/schema/aop/spring-aop-3.2.xsd 
		http://www.springframework.org/schema/tx 
		http://www.springframework.org/schema/tx/spring-tx-3.2.xsd">

	<context:component-scan base-package="demo.mvc"></context:component-scan>

	<!-- 
		<mvc:annotation-driven/>可以帮助自动创建
		注解处理器映射器RequestMappingHandlermapping，
		注解处理器适配器RequestMappingHandlerAdapter;
		并且提供对json格式的支持。
	 -->
	<mvc:annotation-driven/>
	
	<!-- 配置sprigmvc视图解析器：解析逻辑试图 后台返回逻辑试图：index 视图解析器解析出真正物理视图：前缀+逻辑试图+后缀====/WEB-INF/jsps/index.jsp -->
	<bean
		class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/jsps/"></property>
		<property name="suffix" value=".jsp"></property>
	</bean>
</beans>

二、测试

2.1、编码，尝试请求响应JSON格式的实体

package demo.mvc.controller;

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

import demo.mvc.entity.User;

@Controller
@RequestMapping("/test")
public class TestController {

	@RequestMapping("/t1.do")
	public @ResponseBody User test1() {
		User user = new User("张三", "男", 18);
		return user;
	}
}

测试：