SpringBoot之返回json数据的实现方法

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。