在前后端分離的情況下，我們經常會定義一個統一的反回數據格式，通常都會包含狀態碼，返回信息，返回的數據，是否成功等參數。

1、ResultCode

單獨定義了一個ReturnCode枚舉類用于存儲代碼和返回的Message

public enum ResultCode { //成功 SUCCESS(200), // 失敗 FAIL(400), // 未認證（簽名錯誤） UNAUTHORIZED(401), // 接口不存在 NOT_FOUND(404), // 服務器內部錯誤 INTERNAL_SERVER_ERROR(500); public int code; ResultCode(int code) { this.code=code; }}

2、ResponseResult

/* 統一返回信息 */public class ResponseResult<T> { public int code; //返回狀態碼200成功 private String msg; //返回描述信息 private T data; //返回內容體 public ResponseResult<T> setCode(ResultCode retCode) { this.code = retCode.code; return this; } public int getCode() { return code; } public ResponseResult<T> setCode(int code) { this.code = code; return this; } public String getMsg() { return msg; } public ResponseResult<T> setMsg(String msg) { this.msg = msg; return this; } public T getData() { return data; } public ResponseResult<T> setData(T data) { this.data = data; return this; } }

在定義一個統一返回類：

3、Response

public class Response { private final static String SUCCESS = 'success'; private final static String FAIL = 'fail'; public static <T> ResponseResult<T> makeOKRsp() { return new ResponseResult<T>().setCode(ResultCode.SUCCESS).setMsg(SUCCESS); } public static <T> ResponseResult<T> makeOKRsp(String message) { return new ResponseResult<T>().setCode(ResultCode.SUCCESS).setMsg(message); } public static <T> ResponseResult<T> makeOKRsp(T data) { return new ResponseResult<T>().setCode(ResultCode.SUCCESS).setMsg(SUCCESS).setData(data); } public static <T> ResponseResult<T> makeErrRsp(String message) { return new ResponseResult<T>().setCode(ResultCode.INTERNAL_SERVER_ERROR).setMsg(message); } public static <T> ResponseResult<T> makeRsp(int code, String msg) { return new ResponseResult<T>().setCode(code).setMsg(msg); } public static <T> ResponseResult<T> makeRsp(int code, String msg, T data) { return new ResponseResult<T>().setCode(code).setMsg(msg).setData(data); }}

4、新建 IUserService

新建測試用戶接口類

package com.example.demo.service;import com.example.demo.entity.User;public interface IUserService { public User getUserInfo();}

5、新建 UserServiceImpl

新建測試用戶信息服務類

package com.example.demo.service.impl;import com.example.demo.entity.User;import com.example.demo.service.UserService;import org.springframework.stereotype.Service; import java.io.File;import java.text.SimpleDateFormat;import java.util.Date;import java.util.logging.SimpleFormatter; @Servicepublic class UserServiceImpl implements IUserService { public User getUserInfo(){ User user = new User(); user.setName('jack'); user.setPassword(12341234); return user; } }

6、在controller調用

@Autowired UserService service; @RequestMapping(value = '/getUserItem',method = RequestMethod.GET) public ResponseResult<User> getUserItem(){ try { User user = service.getUserInfo(); String[] arr= new String[]{'測試'}; return Response.makeOKRsp(user); }catch (Exception e) { return Response.makeErrRsp('查詢用戶信息異常'); } }

返回結果：

7、全局異常處理器

/** * 全局異常處理 */@RestControllerAdvicepublic class GlobalExceptionHandler { /*============= 請求錯誤 start ==============================================*/ /** * HTTP 請求方式不支持異常 * HttpRequestMethodNotSupportedException * @return {@link ResponseResult} */ @ExceptionHandler(value = HttpRequestMethodNotSupportedException.class) public ResponseResult httpRequestMethodNotSupportException(HttpRequestMethodNotSupportedException e, HttpServletRequest request) { return Response.makeErrRsp('請求方式不支持異常'); } /*============= 請求錯誤 end ==============================================*/ }

修改一下getUserItem讓其拋出自定義查詢返回null的異常：

總結

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