在前后端分离的情况下，我们经常会定义一个统一的反回数据格式，通常都会包含状态码，返回信息，返回的数据，是否成功等参数。
1、ResultCode
单独定义了一个ReturnCode枚举类用于存储代码和返回的Message
public enum ResultCode {
//成功
SUCCESS(200),
// 失败
FAIL(400),
// 未认证（签名错误）
UNAUTHORIZED(401),
// 接口不存在
NOT_FOUND(404),
// 服务器内部错误
INTERNAL_SERVER_ERROR(500);
public int code;
ResultCode(int code)
{
this.code=code;
}
}
2、ResponseResult
/*
统一返回信息
*/
public class ResponseResult<T> {
public int code; //返回状态码200成功
private String msg; //返回描述信息
private T data; //返回内容体
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;
}
}
在定义一个统一返回类：
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
新建测试用户接口类
package com.example.demo.service;
import com.example.demo.entity.User;
public interface IUserService {
public User getUserInfo();
}
5、新建 UserServiceImpl
新建测试用户信息服务类
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;
@Service
public class UserServiceImpl implements IUserService {
public User getUserInfo(){
User user = new User();
user.setName("jack");
user.setPassword(12341234);
return user;
}
}
6、在controller调用
@Autowired
UserService service;
@RequestMapping(value = "/getUserItem",method = RequestMethod.GET)
public ResponseResult<User> getUserItem(){
try {
User user = service.getUserInfo();
String[] arr= new String[]{"测试"};
return Response.makeOKRsp(user);
}catch (Exception e)
{
return Response.makeErrRsp("查询用户信息异常");
}
}
返回结果：
7、全局异常处理器
/**
* 全局异常处理
*/
@RestControllerAdvice
public class GlobalExceptionHandler {
/*============= 请求错误 start ==============================================*/
/**
* HTTP 请求方式不支持异常
* HttpRequestMethodNotSupportedException
* @return {@link ResponseResult}
*/
@ExceptionHandler(value = HttpRequestMethodNotSupportedException.class)
public ResponseResult httpRequestMethodNotSupportException(HttpRequestMethodNotSupportedException e, HttpServletRequest request) {
return Response.makeErrRsp("请求方式不支持异常");
}
/*============= 请求错误 end ==============================================*/
}
修改一下getUserItem让其抛出自定义查询返回null的异常：
