SpringBoot之返回json数据的实现方法

小蚂蚁

这篇文章主要介绍了SpringBoot之返回json数据的实现方法,小编觉得挺不错的，现在分享给大家，也给大家做个参考。一起跟随小编过来看看吧
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CodeAE代码之家。
原文链接：https://www.cnblogs.com/zhanghaoliang/p/7389336.html