一、创建一个springBoot个项目

操作详情参考：1.SpringBoo之Helloword 快速搭建一个web项目

二、编写实体类

/** * Created by CR7 on 2017-8-18 返回Json数据实体类 */public class User { private int id; private String username; private String password; public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public int getId() { return id; } public void setId(int id) { this.id = id; }}

三、编写控制层Controller类

import com.example.bean.User;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;/** * Created by CR7 on 2017-8-18 Json返回数据的Controller */@RestController@RequestMapping("user") public class ReturnJsoncontroller { @RequestMapping("getUser") public User getUser(){ User user = new User(); user.setId(1); user.setUsername("zhanghaoliang"); user.setPassword("1231"); return user; }}

四、测试返回Json数据

浏览器输入http://localhost:8080/user/getUser

得出结果：服务器是以json数据格式返回给浏览器

五、返回list到页面

5.1.返回数据的controller

package com.example.demo;import com.example.bean.User;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;import java.util.ArrayList;import java.util.List;/** * Created by CR7 on 2017-8-18 Json返回数据的Controller */@RestController@RequestMapping("user")public class ReturnJsoncontroller { @RequestMapping("getUserList") public List<User> getUserList(){ User user1 = new User(); user1.setId(1); user1.setUsername("zhanghaoliang"); user1.setPassword("123"); User user2 = new User(); user2.setId(2); user2.setUsername("chensi"); user2.setPassword("456"); User user3 = new User(); user3.setId(3); user3.setUsername("doudou"); user3.setPassword("789"); List<User> list = new ArrayList<>(); list.add(user1); list.add(user2); list.add(user3); return list; }}

5.2.得出结果

在浏览器访问 http://localhost:8080/user/getUserList

六、返回map到浏览器

既然返回实体，和list的试验过了，那么再试验一下返回Map类型的数据吧

6.1返回的Controller

package com.example.demo;import com.example.bean.User;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;/** * Created by CR7 on 2017-8-18 Json返回数据的Controller */@RestController@RequestMapping("user")public class ReturnJsoncontroller { @RequestMapping("getUserMap") public Map<String,User> getUserMap(){ User user1 = new User(); user1.setId(1); user1.setUsername("zhanghaoliang"); user1.setPassword("123"); User user2 = new User(); user2.setId(2); user2.setUsername("chensi"); user2.setPassword("456"); User user3 = new User(); user3.setId(3); user3.setUsername("doudou"); user3.setPassword("789"); Map<String,User> map = new HashMap<>(); map.put("user1",user1); map.put("user2",user2); map.put("user3",user3); return map; }}

6.2得出的结果

在浏览器中访问http://localhost:8080/user/getUserMap

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。