springmvc框架找那个@responseBody注解

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
 <title>Title</title>
 <script src="js/jquery.min.js"></script>
 <script>
 //页面加载绑定单击事件
 $(function () {
 $("#btn").click(function () {
 // alert("hello ajax");
 //发送ajax请求
 $.ajax({
 url: "user/testAjax",
 contentType: "application/json;charset=UTF-8",
 data:'{"username": "zmy", "password": "123", "age": 20}' ,
 dataType: "json",
 type: "post",
 success: function (data) {
 //data服务器端响应的json的数据，进行解析
 alert(data);
 alert(data.username);
 alert(data.password);
 alert(data.age);
 }
 });
 });
 });
 </script>
</head>
<body>
<a href="user/testString">testString</a><br/>

<a href="user/testVoid">testVoid</a><br/>

<a href="user/testModelAndView">testModelAndView</a><br/>

<a href="user/testForwardOrRedirect">testForwardOrRedirect</a><br/>

<button id="btn">发送ajax请求</button>
</body>
</html>

package com.hope.controller;

import com.hope.domain.User;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;

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

/**
 * @author newcityman
 * @date 2019/11/27 - 20:38
 */
@Controller("userController")
@RequestMapping(path = {"/user"})
public class UserController {
 /**
 * 返回值是String
 *
 * @param model
 * @return
 */
 @RequestMapping(path = "/testString")
 public String testString(Model model) {
 System.out.println("testString执行成功");
 User user = new User();

 user.setUsername("zmy");
 user.setPassword("123");
 user.setAge(12);
 model.addAttribute("user", user);
 return "success";
 }

 /**
 * 测试testVoid方法
 *
 * @param
 * @return
 */

 @RequestMapping(path = "/testVoid")
 public void testVoid(HttpServletRequest request, HttpServletResponse response) throws Exception {
 System.out.println("testString执行成功");
 //请求转发
// request.getRequestDispatcher("/WEB-INF/pages/success.jsp").forward(request,response);
 //重定向(重定向是不能够直接发送请求去访问WEB-INF下的页面的)
// response.sendRedirect(request.getContextPath()+"/index.jsp");
 //直接流进行响应
 //设置中文乱码
 response.setCharacterEncoding("UTF-8");
 response.setContentType("text/html;charset=UTF-8");
 response.getWriter().print("hello 张三");
 return;
 }


 /**
 * 返回值是ModelAndView
 *
 * @param
 * @return
 */
 @RequestMapping(path = "/testModelAndView")
 public ModelAndView testModelAndView() {
 ModelAndView mv = new ModelAndView();
 System.out.println("testString执行成功");
 User user = new User();

 user.setUsername("tomcat");
 user.setPassword("987");
 user.setAge(5);
 mv.addObject("user", user);
 mv.setViewName("success");
 return mv;
 }

 /**
 * 测试forward和redirect关键字
 *
 * @param
 * @return
 */
 @RequestMapping(path = "/testForwardOrRedirect")
 public String testForwardOrRedirect() {
 System.out.println("testForwardOrRedirect执行成功");
 //请求转发
// return "forward:/WEB-INF/pages/success.jsp";
 //重定向
 return "redirect:/index.jsp";
 }

 /**
 * 模拟异步请求响应
 */
 @RequestMapping(path = "/testAjax")
 public @ResponseBody User testAjax(@RequestBody User user) {
 System.out.println("testAjax执行成功");
 //客户端发送ajax的请求，传递的是json字符串，后端把json字符串封装到user对象中
 System.out.println(user);
 //做响应，模拟查询数据库
 user.setUsername("light");
 user.setPassword("70578331");
 user.setAge(18);
 return user;
 }



}

springmvc框架找那个@responseBody注解

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