Jquery+ajax+springMVC如何返回json

来源：E通财经

JSP页面：

<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
	<title>登录验证</title>
 	<script type="text/javascript" src="js/jquery-1.8.3.js"></script>
 	<script type="text/javascript">
 	$(function(){ 	
 	//ajax验证
 	$("#ajax1").click(function(){
 	alert(1);
 	$.post(
 	"ajax1.action",
 	function(result){
 	alert(2);
 	alert(result.ms);
 	}
 	);
 	});	
 	});
 	</script>
</head>

<body>
	<p id="con">
 	<p class="center"><h2>欢迎登录</h2></p>
 	<p>
 	<form action="login.action" method="post">
 	<table>
 	<tr>
 	<td>用户名：</td>
 	<td colspan="3"><input type="text" name="name"/></td>
 	<td></td>
 	</tr>
 	<tr>
 	<td>密 码：</td>
 	<td colspan="3"><input type="password" name="pwd"/></td>
 	<td></td>
 	</tr>
 	<tr>
 	<td>用户名：</td>
 	<td><input type="text" name="code"/></td>
 	<td></td>
 	</tr>
 	<tr>
 	<td class="center">
 	<input type="submit" name="sub" value="登录"/>
 	</td>
 	</tr>
 	<tr>
 	<td>
 	<button id="ajax1">ajax测试1</button>
 	</td>
 	</tr>
 	</table>
 	</form>
 	</p>
 </p>
</body>
</html>

后台控制类：

package com.login.control;

import javax.servlet.http.HttpServletRequest;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;

import com.alibaba.fastjson.JSONObject;
import com.login.bean.Users;
import com.login.service.UsersService;

/**
 * 用户控制类
 * @author
 *
 */
@Controller
public class UsersControl {
	
	@RequestMapping(value="ajax1.action",method= RequestMethod.POST) 	@ResponseBody
	public Object ajax1(HttpServletRequest request){
	System.out.println("进入控制类");
	JSONObject json = new JSONObject();
	String ms = "ajax测试1成功！哈哈!";
	json.put("ms", ms);
	System.out.println("出控制类");
	return json;
	}
}

必须加这两句才能返回json值

@RequestMapping(value="ajax1.action",method= RequestMethod.POST)
@ResponseBody