全局异常处理

项目中的异常在GlobalExceptionHandler类中进行统一的拦截处理

捕获到的异常会在doLog方法中存储进eb_exception_log表中，方便对异常进行回溯处理。

当然在这里，如果觉得所有异常都进表会产生无效数据，校验性的异常可以不进行存储，只需判断e.getCode()值不为空，并且排除特定code值即可。

@RestControllerAdvice
public class GlobalExceptionHandler {

    private static final Logger LOGGER = LoggerFactory.getLogger(GlobalExceptionHandler.class);

    private static String REQUESTBODY = "requestBodyMessage";

    @Autowired
    private ExceptionLogService exceptionLogService;

    /**
     * 处理自定义的业务异常
     */
    @ResponseStatus(HttpStatus.OK)
    @ExceptionHandler(value = CrmebException.class)
    public CommonResult crmebExceptionHandler(HttpServletRequest request, CrmebException e) {
        doLog(request, e);
        if (ObjectUtil.isNull(e.getCode())) {
            return CommonResult.failed(e.getMessage());
        }
        return CommonResult.failed(e);
    }

    /**
     * 处理业务业务异常
     */
    @ResponseStatus(HttpStatus.OK)
    @ExceptionHandler(value = BusinessException.class)
    public CommonResult crmebExceptionHandler(HttpServletRequest request, BusinessException e) {
        doLog(request, e);
        if (ObjectUtil.isNull(e.getCode())) {
            return CommonResult.failed(e.getMessage());
        }
        return CommonResult.failed(e);
    }

    /**
     * 统一处理非自定义异常外的所有异常
     */
    @ResponseStatus(HttpStatus.OK)
    @ExceptionHandler(value = Exception.class)
    public CommonResult crmebExceptionHandler(HttpServletRequest request, Exception e) {
        doLog(request, e);
        return CommonResult.failed(e.getMessage());
    }

    /**
     * 兼容Validation校验框架：忽略参数异常处理器
     */
    @ResponseStatus(HttpStatus.OK)
    @ExceptionHandler(MissingServletRequestParameterException.class)
    public CommonResult parameterMissingExceptionHandler(HttpServletRequest request, MissingServletRequestParameterException e) {
        doLog(request, e);
        return CommonResult.failed(CommonResultCode.VALIDATE_FAILED, "请求参数 " + e.getParameterName() + " 不能为空");
    }

    /**
     * 兼容Validation校验框架：缺少请求体异常处理器
     */
    @ResponseStatus(HttpStatus.OK)
    @ExceptionHandler(HttpMessageNotReadableException.class)
    public CommonResult parameterBodyMissingExceptionHandler(HttpServletRequest request, HttpMessageNotReadableException e) {
        doLog(request, e);
        return CommonResult.failed(CommonResultCode.VALIDATE_FAILED, "参数体不能为空");
    }

    /**
     * 兼容Validation校验框架：参数效验异常处理器
     */
    @ResponseStatus(HttpStatus.OK)
    @ExceptionHandler(MethodArgumentNotValidException.class)
    public CommonResult parameterExceptionHandler(HttpServletRequest request, MethodArgumentNotValidException e) {
        doLog(request, e);
        // 获取异常信息
        BindingResult exceptions = e.getBindingResult();
        // 判断异常中是否有错误信息，如果存在就使用异常中的消息，否则使用默认消息
        if (exceptions.hasErrors()) {
            List<ObjectError> errors = exceptions.getAllErrors();
            if (!errors.isEmpty()) {
                // 这里列出了全部错误参数，按正常逻辑，只需要第一条错误即可
                FieldError fieldError = (FieldError) errors.get(0);
                return CommonResult.failed(CommonResultCode.VALIDATE_FAILED, fieldError.getDefaultMessage());
            }
        }
        return CommonResult.failed(CommonResultCode.VALIDATE_FAILED, "请求参数校验异常");
    }

    /**
     * 拦截表单参数校验
     */
    @ResponseStatus(HttpStatus.OK)
    @ExceptionHandler({BindException.class})
    public CommonResult bindException(HttpServletRequest request, BindException e) {
        doLog(request, e);
        BindingResult bindingResult = e.getBindingResult();
        return CommonResult.failed(CommonResultCode.VALIDATE_FAILED, Objects.requireNonNull(bindingResult.getFieldError()).getDefaultMessage());
    }

    /**
     * 拦截参数类型不正确
     */
    @ResponseStatus(HttpStatus.OK)
    @ExceptionHandler(HttpMediaTypeNotSupportedException.class)
    public CommonResult bindException(HttpServletRequest request, HttpMediaTypeNotSupportedException e) {
        doLog(request, e);
        return CommonResult.failed(CommonResultCode.VALIDATE_FAILED, Objects.requireNonNull(e.getMessage()));
    }

    /**
     * 由于body在接口读取后无法获取，这里把body提前取出放到参数中，在上面处理异常时使用
     */
    @ModelAttribute
    public void getBobyInfo(HttpServletRequest request) {
        //获取requestBody
        try {
            ContentCachingRequestWrapper requestWapper = null;
            if (request instanceof HttpServletRequest) {
                requestWapper = (ContentCachingRequestWrapper) request;
            }
            String body = IOUtils.toString(requestWapper.getBody(), request.getCharacterEncoding());
            request.setAttribute(REQUESTBODY, body);
        } catch (Exception e) {

        }

    }

    /**
     * 打印日志
     */
    private void doLog(HttpServletRequest request, Exception e) {
        LOGGER.error("捕获到异常：", e);
        // 加入数据库日志记录
        StringWriter sw = new StringWriter();
        e.printStackTrace(new PrintWriter(sw, true));
        // 异常的详情
        String expDetail = sw.toString();

        try {
            sw.close();
        } catch (IOException ioException) {
            LOGGER.error("异常日志：关闭异常详情Writer异常");
        }

        // 异常的url
        String expUrl = request.getRequestURI();

        // 异常的参数
        Object body = request.getAttribute(REQUESTBODY);
        String expParams = ObjectUtil.isNotNull(body) ? body.toString() : "";

        // 异常的类型
        String expType = e.getClass().getName();

        // 异常的类名
        StackTraceElement stackTraceElement = e.getStackTrace()[0];
        String expController = stackTraceElement.getClassName();

        // 异常的方法名
        String expMethod = stackTraceElement.getMethodName();

        ExceptionLog exceptionLog = new ExceptionLog();
        exceptionLog.setExpUrl(expUrl);
        exceptionLog.setExpParams(expParams);
        exceptionLog.setExpType(expType);
        exceptionLog.setExpController(expController);
        exceptionLog.setExpMethod(expMethod);
        exceptionLog.setExpDetail(expDetail);

        exceptionLogService.save(exceptionLog);
    }

}