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
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/** * 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
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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
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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
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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服务器之家。
原文链接:https://www.cnblogs.com/zhanghaoliang/p/7389336.html