spring boot @ControllerAdvice 注解 源码执行位置

org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver#doResolveHandlerMethodException

 

protected ServletInvocableHandlerMethod getExceptionHandlerMethod(
            @Nullable HandlerMethod handlerMethod, Exception exception) {

        Class<?> handlerType = null;

        if (handlerMethod != null) {
            // Local exception handler methods on the controller class itself.
            // To be invoked through the proxy, even in case of an interface-based proxy.
            handlerType = handlerMethod.getBeanType();
            ExceptionHandlerMethodResolver resolver = this.exceptionHandlerCache.get(handlerType);
            if (resolver == null) {
                resolver = new ExceptionHandlerMethodResolver(handlerType);
                this.exceptionHandlerCache.put(handlerType, resolver);
            }
            Method method = resolver.resolveMethod(exception);
            if (method != null) {
                return new ServletInvocableHandlerMethod(handlerMethod.getBean(), method);
            }
            // For advice applicability check below (involving base packages, assignable types
            // and annotation presence), use target class instead of interface-based proxy.
            if (Proxy.isProxyClass(handlerType)) {
                handlerType = AopUtils.getTargetClass(handlerMethod.getBean());
            }
        }

        for (Map.Entry<ControllerAdviceBean, ExceptionHandlerMethodResolver> entry : this.exceptionHandlerAdviceCache.entrySet()) {
            ControllerAdviceBean advice = entry.getKey();
            if (advice.isApplicableToBeanType(handlerType)) {
                ExceptionHandlerMethodResolver resolver = entry.getValue();
                Method method = resolver.resolveMethod(exception);
                if (method != null) {
                    return new ServletInvocableHandlerMethod(advice.resolveBean(), method);
                }
            }
        }

        return null;
    }

 

	protected ModelAndView doResolveHandlerMethodException(HttpServletRequest request,
			HttpServletResponse response, @Nullable HandlerMethod handlerMethod, Exception exception) {

		ServletInvocableHandlerMethod exceptionHandlerMethod = getExceptionHandlerMethod(handlerMethod, exception);
		if (exceptionHandlerMethod == null) {
			return null;
		}

		if (this.argumentResolvers != null) {
			exceptionHandlerMethod.setHandlerMethodArgumentResolvers(this.argumentResolvers);
		}
		if (this.returnValueHandlers != null) {
			exceptionHandlerMethod.setHandlerMethodReturnValueHandlers(this.returnValueHandlers);
		}

		ServletWebRequest webRequest = new ServletWebRequest(request, response);
		ModelAndViewContainer mavContainer = new ModelAndViewContainer();

		try {
			if (logger.isDebugEnabled()) {
				logger.debug("Using @ExceptionHandler " + exceptionHandlerMethod);
			}
			Throwable cause = exception.getCause();
			if (cause != null) {
				// Expose cause as provided argument as well
				exceptionHandlerMethod.invokeAndHandle(webRequest, mavContainer, exception, cause, handlerMethod);
			}
			else {
				// Otherwise, just the given exception as-is
				exceptionHandlerMethod.invokeAndHandle(webRequest, mavContainer, exception, handlerMethod);
			}
		}
		catch (Throwable invocationEx) {
			// Any other than the original exception is unintended here,
			// probably an accident (e.g. failed assertion or the like).
			if (invocationEx != exception && logger.isWarnEnabled()) {
				logger.warn("Failure in @ExceptionHandler " + exceptionHandlerMethod, invocationEx);
			}
			// Continue with default processing of the original exception...
			return null;
		}

		if (mavContainer.isRequestHandled()) {
			return new ModelAndView();
		}
		else {
			ModelMap model = mavContainer.getModel();
			HttpStatus status = mavContainer.getStatus();
			ModelAndView mav = new ModelAndView(mavContainer.getViewName(), model, status);
			mav.setViewName(mavContainer.getViewName());
			if (!mavContainer.isViewReference()) {
				mav.setView((View) mavContainer.getView());
			}
			if (model instanceof RedirectAttributes) {
				Map<String, ?> flashAttributes = ((RedirectAttributes) model).getFlashAttributes();
				RequestContextUtils.getOutputFlashMap(request).putAll(flashAttributes);
			}
			return mav;
		}
	}

　　

 

protected ModelAndView doResolveHandlerMethodException(HttpServletRequest request,
HttpServletResponse response, @Nullable HandlerMethod handlerMethod, Exception exception) {

   ServletInvocableHandlerMethod exceptionHandlerMethod = getExceptionHandlerMethod(handlerMethod, exception);
   if (exceptionHandlerMethod == null) {
      return null;
}

   if (this.argumentResolvers != null) {
      exceptionHandlerMethod.setHandlerMethodArgumentResolvers(this.argumentResolvers);
}
   if (this.returnValueHandlers != null) {
      exceptionHandlerMethod.setHandlerMethodReturnValueHandlers(this.returnValueHandlers);
}

   ServletWebRequest webRequest = new ServletWebRequest(request, response);
ModelAndViewContainer mavContainer = new ModelAndViewContainer();

   try {
      if (logger.isDebugEnabled()) {
         logger.debug("Using @ExceptionHandler " + exceptionHandlerMethod);
}
      Throwable cause = exception.getCause();
      if (cause != null) {
         // Expose cause as provided argument as well
exceptionHandlerMethod.invokeAndHandle(webRequest, mavContainer, exception, cause, handlerMethod);
}
      else {
         // Otherwise, just the given exception as-is
exceptionHandlerMethod.invokeAndHandle(webRequest, mavContainer, exception, handlerMethod);
}
   }
   catch (Throwable invocationEx) {
      // Any other than the original exception is unintended here,
      // probably an accident (e.g. failed assertion or the like).
if (invocationEx != exception && logger.isWarnEnabled()) {
         logger.warn("Failure in @ExceptionHandler " + exceptionHandlerMethod, invocationEx);
}
      // Continue with default processing of the original exception...
return null;
}

   if (mavContainer.isRequestHandled()) {
      return new ModelAndView();
}
   else {
      ModelMap model = mavContainer.getModel();
HttpStatus status = mavContainer.getStatus();
ModelAndView mav = new ModelAndView(mavContainer.getViewName(), model, status);
mav.setViewName(mavContainer.getViewName());
      if (!mavContainer.isViewReference()) {
         mav.setView((View) mavContainer.getView());
}
      if (model instanceof RedirectAttributes) {
         Map<String, ?> flashAttributes = ((RedirectAttributes) model).getFlashAttributes();
RequestContextUtils.getOutputFlashMap(request).putAll(flashAttributes);
}
      return mav;
}
}