Java里如何使用ExceptionHandler统一处理Web请求异常_Web异常集中处理方法说明

@ControllerAdvice
public class GlobalExceptionHandler {

    @ExceptionHandler(NullPointerException.class)
    public ResponseEntity handleNullPointer(NullPointerException e) {
        return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR)
                .body("发生了空指针异常：" + e.getMessage());
    }

    @ExceptionHandler(IllegalArgumentException.class)
    public ResponseEntity> handleIllegalArgument(IllegalArgumentException e) {
        Map error = new HashMap<>();
        error.put("error", "参数错误");
        error.put("message", e.getMessage());
        return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(error);
    }

    @ExceptionHandler(Exception.class)
    public ResponseEntity> handleGeneralException(Exception e) {
        Map error = new HashMap<>();
        error.put("error", "服务器内部错误");
        error.put("message", e.getClass().getSimpleName() + ": " + e.getMessage());
        return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).body(error);
    }
}

public class BusinessException extends RuntimeException {
    public BusinessException(String message) {
        super(message);
    }
}

@ExceptionHandler(BusinessException.class)
public ResponseEntity> handleBusinessException(BusinessException e) {
    Map response = new HashMap<>();
    response.put("error", "业务异常");
    response.put("message", e.getMessage());
    return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(response);
}

@ResponseStatus(value = HttpStatus.FORBIDDEN, reason = "权限不足")
public class AccessDeniedException extends RuntimeException {
    public AccessDeniedException(String message) {
        super(message);
    }
}

@ExceptionHandler(MethodArgumentNotValidException.class)
public ResponseEntity> handleValidationException(MethodArgumentNotValidException e) {
    Map errors = new HashMap<>();
    errors.put("error", "参数校验失败");
    List messages = e.getBindingResult()
            .getFieldErrors()
            .stream()
            .map(FieldError::getDefaultMessage)
            .collect(Collectors.toList());
    errors.put("messages", messages);
    return ResponseEntity.status(HttpStatus.BAD_REQUEST).body(errors);
}