springboot -RestControllerAdvice

@RestControllerAdvice都是对Controller进行增强的，可以全局捕获spring mvc抛的异常。
@ExceptionHandler(value = Exception.class)
ExceptionHandler的作用是用来捕获指定的异常。

@RestControllerAdvice(annotations = RestController.class)
public class UniformReponseHandler {

    @ResponseStatus(HttpStatus.OK)
    public CallResultMsg sendSuccessResponse(){
        return new CallResultMsg(true, CodeAndMsg.SUCCESS, null);
    }

    @ResponseStatus(HttpStatus.OK)
    public CallResultMsg sendSuccessResponse(T data) {
        return new CallResultMsg(true, CodeAndMsg.SUCCESS, data);
    }

    @ExceptionHandler(UserDefinedException.class)
    @ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
    public CallResultMsg sendErrorResponse_UserDefined(Exception exception){
        return new CallResultMsg(false, ((UserDefinedException)exception).getException(), null);
    }

    @ExceptionHandler(Exception.class)
    @ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
    public CallResultMsg sendErrorResponse_System(Exception exception){
        if (exception instanceof UserDefinedException) {
            return this.sendErrorResponse_UserDefined(exception);
        }

        return new CallResultMsg(false, CodeAndMsg.UNKNOWEXCEPTION, null);
    }
}

@ControllerAdvice 和 @RestControllerAdvice都是对Controller进行增强的，可以全局捕获spring mvc抛的异常。
RestControllerAdvice = ControllerAdvice + ResponseBody