get请求

package com.example.demo.controller.poio;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.*;

//字符串格式返回
@RestController
public class ResponseBody {
    @RequestMapping("/hello")
    public String hello() {
        String st = "hello world ~";
        System.out.println(st);
        return st;
    }

    //json 格式返回
    @RequestMapping("/getaddr")
    public Address getaddr() {
        Address addr = new Address();
        addr.setProvince("广东");
        addr.setCity("深圳");
        return addr;
    }

    //集合
    @RequestMapping("/listAddr")
    public List<Address> listAddr() {
        List<Address> list = new ArrayList<>();
        Address addr = new Address();
        addr.setProvince("广东");
        addr.setCity("深圳");
        Address addr1 = new Address();
        addr1.setProvince("南京");
        addr1.setCity("江苏");
        Address add2 = new Address();
        add2.setProvince("青岛");
        add2.setCity("上海");
        list.add(addr);
        list.add(addr1);
        list.add(add2);

        return list;
    }
}

package com.example.demo.controller.poio;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.*;

//字符串格式返回
/*
@RestController
public class ResponseBody {
    @RequestMapping("/hello")
    public String hello() {
        String st = "hello world ~";
        System.out.println(st);
        return st;
    }

    //json 格式返回
    @RequestMapping("/getaddr")
    public Address getaddr() {
        Address addr = new Address();
        addr.setProvince("广东");
        addr.setCity("深圳");
        return addr;
    }

    //集合
    @RequestMapping("/listAddr")
    public List<Address> listAddr() {
        List<Address> list = new ArrayList<>();
        Address addr = new Address();
        addr.setProvince("广东");
        addr.setCity("深圳");
        Address addr1 = new Address();
        addr1.setProvince("南京");
        addr1.setCity("江苏");
        Address add2 = new Address();
        add2.setProvince("青岛");
        add2.setCity("上海");
        list.add(addr);
        list.add(addr1);
        list.add(add2);

        return list;
    }
}
*/

@RestController
public class ResponseBody {
    @RequestMapping("/hello")
    public Result hello() {
        String st = "hello world ~";
        System.out.println(st);
       // return new Result(1,"success",st);
        return Result.success("hello world");
    }

    //json 格式返回
    @RequestMapping("/getaddr")
    public Result getaddr() {
        Address addr = new Address();
        addr.setProvince("广东");
        addr.setCity("深圳");
        return Result.success(addr);
    }

    //集合
    @RequestMapping("/listAddr")
    public Result listAddr() {
        List<Address> list = new ArrayList<>();
        Address addr = new Address();
        addr.setProvince("广东");
        addr.setCity("深圳");
        Address addr1 = new Address();
        addr1.setProvince("南京");
        addr1.setCity("江苏");
        Address add2 = new Address();
        add2.setProvince("青岛");
        add2.setCity("上海");
        list.add(addr);
        list.add(addr1);
        list.add(add2);

        return Result.success(list);
    }
}

package com.example.demo.controller.poio;

public class Result {
    private Integer code;  //成功1，失败1
    private String msg ;  //提供信息
    private Object data;  //数据

    public Result() {
    }

    public Result(Integer code, String msg, Object data) {
        this.code = code;
        this.msg = msg;
        this.data = data;
    }

    public Integer getCode() {
        return code;
    }

    public void setCode(Integer code) {
        this.code = code;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public Object getData() {
        return data;
    }

    public void setData(Object data) {
        this.data = data;
    }


    public static Result success(Object data){
        return new Result(1,"success",data);
    }

    public static Result success(){
        return new Result(1,"success",null);
    }

    public static Result success(String msg){
        return new Result(0,"success",null);
    }

    @Override
    public String toString() {
        return "Result{" +
                "code=" + code +
                ", msg='" + msg + '\'' +
                ", data=" + data +
                '}';
    }
}