SpringBoot返回json数据_springboot注解返回的json是一个数组对象

1、使用Spring InitialLizr快速搭建一个Spring Boot项目·

2 、新建一个实体类User

 
 
/**
 * Created by Wsy on 2018-10-23 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;
    }
}

3、编写controller类

package cn.within.controller;
 
import cn.within.util.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 Wsy on 2018-10-23 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("chenwei");
        user.setPassword("1231");
        return user;
    }
    @RequestMapping("getUserList")
    public List<User> getUserList(){
        User user1  = new User();
        user1.setId(1);
        user1.setUsername("chenwei");
        user1.setPassword("123");
        User user2 = new User();
        user2.setId(2);
        user2.setUsername("xiaoyan");
        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;
 
}
    @RequestMapping("getUserMap")
    public Map<String,User> getUserMap(){
        User user1  = new User();
        user1.setId(1);
        user1.setUsername("chenwei");
        user1.setPassword("123");
        User user2 = new User();
        user2.setId(2);
        user2.setUsername("wsy");
        user2.setPassword("456");
        User user3 = new User();
        user3.setId(3);
        user3.setUsername("wei");
        user3.setPassword("789");
        Map<String,User> map = new HashMap<>();
        map.put("user1",user1);
        map.put("user2",user2);
        map.put("user3",user3);
        return map;
    }
}

4、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