回傳使用JSON格式

1. 新增承載回應的類別

1. 新增package com.example.demo.response
2. 在該package中新增一個類別Response.java
3. 依照API回應格式增加屬性
4. 確保會有空的建構子

package com.example.demo.response;

public class Response {
    public String code;
    public String msg;
    public String time;
    public String datas;

    public Response() {
    // 需有無引數的預設建構子
    }
}

2. 修改Controller

1. 將Method回傳類型改為Response
2. 將Response實例化，並設定其內容
3. 在該方法的註解定義處加入produces = "application/json"

3. 查詢

3.1 Get Code

@RequestMapping(value="/api/mail/get", method = RequestMethod.POST, produces = "application/json")
public @ResponseBody Response mailGet(){
    Response res = new Response();
    res.code = "0000";
    res.msg = "OK";
    res.time = "2017-09-01";
    res.datas = "";
    return res;
}

3.2 測試結果

4. 設定

4.1 Set Code

@RequestMapping(value="/api/mail/set", method = RequestMethod.POST,  produces = "application/json")
public @ResponseBody Response mailSet(){
    Response res = new Response();
    res.code = "0000";
    res.msg = "OK";
    res.time = "2017-09-01";
    res.datas = "";
    return res;
}

4.2 測試結果

可產生基礎JSON回應