SpringMVC中@RestControllerAdvice統一異常處理

GlobalExceptionHandler為統一異常處理類，MyException自定義異常類，

@RestControllerAdvice相當於Controller的切面，對異常統一處理，定制，這樣更好返回給前端。

@RestControllerAdvice
public class GlobalExceptionHandler {
    public GlobalExceptionHandler(){}
    @ExceptionHandler({MyException.class})
    public ResponseEntity<ResErr> handleMyException(MyException ex){
        ResErr resErr=new ResErr();
        resErr.setErrCode(12344);
        resErr.setErrMsg(ex.getMessage());
        return new ResponseEntity<>(resErr, HttpStatus.OK);
    }
    @ExceptionHandler({RuntimeException.class})
    public ResponseEntity<ResErr> handleMyException(RuntimeException ex){
        ResErr resErr=new ResErr();
        resErr.setErrCode(99999);
        resErr.setErrMsg("運行時異常");
        return new ResponseEntity<>(resErr, HttpStatus.OK);
    }
    @ExceptionHandler({Exception.class})
    public ResponseEntity<ResErr> handleMyException(Exception ex){
        ResErr resErr=new ResErr();
        resErr.setErrCode(99999);
        resErr.setErrMsg("系統異常");
        return new ResponseEntity<>(resErr, HttpStatus.OK);
    }
}