SpringBoot之返回json數(shù)據(jù)的實(shí)現(xiàn)方法

發(fā)布時(shí)間：2020-10-21 12:20:29 來源：腳本之家閱讀：197 作者：張昊亮欄目：編程語言

一、創(chuàng)建一個(gè)springBoot個(gè)項(xiàng)目

操作詳情參考：1.SpringBoo之Helloword 快速搭建一個(gè)web項(xiàng)目

二、編寫實(shí)體類

/**
 * Created by CR7 on 2017-8-18 返回Json數(shù)據(jù)實(shí)體類
 */
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、編寫控制層Controller類

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?cái)?shù)據(jù)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、測(cè)試返回Json數(shù)據(jù)

瀏覽器輸入http://localhost:8080/user/getUser

得出結(jié)果：服務(wù)器是以json數(shù)據(jù)格式返回給瀏覽器

SpringBoot之返回json數(shù)據(jù)的實(shí)現(xiàn)方法

五、返回list到頁面

5.1.返回?cái)?shù)據(jù)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?cái)?shù)據(jù)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.得出結(jié)果

在瀏覽器訪問 http://localhost:8080/user/getUserList

SpringBoot之返回json數(shù)據(jù)的實(shí)現(xiàn)方法

六、返回map到瀏覽器

既然返回實(shí)體，和list的試驗(yàn)過了，那么再試驗(yàn)一下返回Map類型的數(shù)據(jù)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?cái)?shù)據(jù)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得出的結(jié)果

在瀏覽器中訪問http://localhost:8080/user/getUserMap

SpringBoot之返回json數(shù)據(jù)的實(shí)現(xiàn)方法

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SpringBoot之返回json數(shù)據(jù)的實(shí)現(xiàn)方法

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