2022-05-02 全局异常处理

• 前言
• 全局异常处理
• • ApiException
  • FormValidException

springboot带给开发人员不需要关注过多底层实现，只需要关心业务逻辑。在出现问题时，如果能够对springboot底层实现，可以帮助我们快速定位出现问题的原因，从根源解决。

这里不过多讨论这些问题，主要从开发规范角度上使用springboot框架

这里只是样例，具体实现以项目为主

@RestControllerAdvice
public class GlobalExceptionHandler {

    @ExceptionHandler(ApiException.class)
    public ResponseResult handlerFormValidException(ApiException e) {
        return ResponseResult.error(e.getResponseStatus());
    }


    @ExceptionHandler(Throwable.class)
    public ResponseResult handlerThrowable(Throwable e) {
        System.out.println(e);
        ResponseStatus uploadError = ResponseStatus.UNKOWN_ERROR;
        if(!StringUtils.isEmpty(e.getMessage())) {
            uploadError.setMessage(e.getMessage());
        }
        return ResponseResult.error(uploadError);
    }

    @ExceptionHandler(FormValidException.class)
    public ResponseResult> handlerFormValidException(FormValidException e) {
        ResponseStatus responseStatus = e.getResponseStatus();
        return ResponseResult.error(responseStatus, e.getMap());
    }


    
    @ExceptionHandler(MethodArgumentNotValidException.class)
    public ResponseResult handlerFormValidException(MethodArgumentNotValidException e) {
        BindingResult bindingResult = e.getBindingResult();
        ResponseStatus formValidError = ResponseStatus.FORM_VALID_ERROR;
        List fieldErrors = bindingResult.getFieldErrors();
        if (!CollectionUtils.isEmpty(fieldErrors)) {
            FieldError fieldError = fieldErrors.get(0);
            String defaultMessage = fieldError.getDefaultMessage();
            formValidError.setMessage(defaultMessage);
            return ResponseResult.error(formValidError);
        }
        formValidError.setMessage("表单校验错误");
        return ResponseResult.error(formValidError);
    }

    
    @ExceptionHandler(AccessDeniedException.class)
    public ResponseResult accessDeniedException(MethodArgumentNotValidException e) {
        return ResponseResult.error(ResponseStatus.NO_PERM);
    }
}

@Data
@AllArgsConstructor
public class ApiException extends RuntimeException {
    private ResponseStatus responseStatus;
}

@Data
@AllArgsConstructor
@NoArgsConstructor
public class FormValidException extends RuntimeException {

    private ResponseStatus responseStatus;

    private Map map;
}