spring-----mvc的反射调用

这几天在看spring mvc 源码，一直很好奇它究竟在哪进行的反射调用，通过源码，仔细阅读，最后发现了调用位置在类

InvocableHandlerMethod 的doInvoke 方法

/**
 * Invoke the handler method with the given argument values.
 */
@Nullable
protected Object doInvoke(Object... args) throws Exception {
   ReflectionUtils.makeAccessible(getBridgedMethod());
   try {
      return getBridgedMethod().invoke(getBean(), args);
   }
   catch (IllegalArgumentException ex) {
      assertTargetBean(getBridgedMethod(), getBean(), args);
      String text = (ex.getMessage() != null ? ex.getMessage() : "Illegal argument");
      throw new IllegalStateException(formatInvokeError(text, args), ex);
   }
   catch (InvocationTargetException ex) {
      // Unwrap for HandlerExceptionResolvers ...
      Throwable targetException = ex.getTargetException();
      if (targetException instanceof RuntimeException) {
         throw (RuntimeException) targetException;
      }
      else if (targetException instanceof Error) {
         throw (Error) targetException;
      }
      else if (targetException instanceof Exception) {
         throw (Exception) targetException;
      }
      else {
         throw new IllegalStateException(formatInvokeError("Invocation failure", args), targetException);
      }
   }
}


doInvoke又是在哪调用的呢？在同类的方法类

@Nullable
public Object invokeForRequest(NativeWebRequest request, @Nullable ModelAndViewContainer mavContainer,
      Object... providedArgs) throws Exception {

   Object[] args = getMethodArgumentValues(request, mavContainer, providedArgs);
   if (logger.isTraceEnabled()) {
      logger.trace("Arguments: " + Arrays.toString(args));
   }
   return doInvoke(args);
}

invokeForRequest 又是在哪里调用的呢？
在 ServletInvocableHandlerMethod 类的

/**
 * Invoke the method and handle the return value through one of the
 * configured {@link HandlerMethodReturnValueHandler HandlerMethodReturnValueHandlers}.
 * @param webRequest the current request
 * @param mavContainer the ModelAndViewContainer for this request
 * @param providedArgs "given" arguments matched by type (not resolved)
 */
public void invokeAndHandle(ServletWebRequest webRequest, ModelAndViewContainer mavContainer,
      Object... providedArgs) throws Exception {

   Object returnValue = invokeForRequest(webRequest, mavContainer, providedArgs);
   setResponseStatus(webRequest);

   if (returnValue == null) {
      if (isRequestNotModified(webRequest) || getResponseStatus() != null || mavContainer.isRequestHandled()) {
         mavContainer.setRequestHandled(true);
         return;
      }
   }
   else if (StringUtils.hasText(getResponseStatusReason())) {
      mavContainer.setRequestHandled(true);
      return;
   }

   mavContainer.setRequestHandled(false);
   Assert.state(this.returnValueHandlers != null, "No return value handlers");
   try {
      this.returnValueHandlers.handleReturnValue(
            returnValue, getReturnValueType(returnValue), mavContainer, webRequest);
   }
   catch (Exception ex) {
      if (logger.isTraceEnabled()) {
         logger.trace(formatErrorForReturnValue(returnValue), ex);
      }
      throw ex;
   }
}

invokeAndHandle 是在哪里调用的？RequestMappingHandlerAdapter

/**
 * Invoke the {@link RequestMapping} handler method preparing a {@link ModelAndView}
 * if view resolution is required.
 * @since 4.2
 * @see #createInvocableHandlerMethod(HandlerMethod)
 */
@Nullable
protected ModelAndView invokeHandlerMethod(HttpServletRequest request,
      HttpServletResponse response, HandlerMethod handlerMethod) throws Exception {

   ServletWebRequest webRequest = new ServletWebRequest(request, response);
   try {
      WebDataBinderFactory binderFactory = getDataBinderFactory(handlerMethod);
      ModelFactory modelFactory = getModelFactory(handlerMethod, binderFactory);

      ServletInvocableHandlerMethod invocableMethod = createInvocableHandlerMethod(handlerMethod);
      if (this.argumentResolvers != null) {
         invocableMethod.setHandlerMethodArgumentResolvers(this.argumentResolvers);
      }
      if (this.returnValueHandlers != null) {
         invocableMethod.setHandlerMethodReturnValueHandlers(this.returnValueHandlers);
      }
      invocableMethod.setDataBinderFactory(binderFactory);
      invocableMethod.setParameterNameDiscoverer(this.parameterNameDiscoverer);

      ModelAndViewContainer mavContainer = new ModelAndViewContainer();
      mavContainer.addAllAttributes(RequestContextUtils.getInputFlashMap(request));
      modelFactory.initModel(webRequest, mavContainer, invocableMethod);
      mavContainer.setIgnoreDefaultModelOnRedirect(this.ignoreDefaultModelOnRedirect);

      AsyncWebRequest asyncWebRequest = WebAsyncUtils.createAsyncWebRequest(request, response);
      asyncWebRequest.setTimeout(this.asyncRequestTimeout);

      WebAsyncManager asyncManager = WebAsyncUtils.getAsyncManager(request);
      asyncManager.setTaskExecutor(this.taskExecutor);
      asyncManager.setAsyncWebRequest(asyncWebRequest);
      asyncManager.registerCallableInterceptors(this.callableInterceptors);
      asyncManager.registerDeferredResultInterceptors(this.deferredResultInterceptors);

      if (asyncManager.hasConcurrentResult()) {
         Object result = asyncManager.getConcurrentResult();
         mavContainer = (ModelAndViewContainer) asyncManager.getConcurrentResultContext()[0];
         asyncManager.clearConcurrentResult();
         LogFormatUtils.traceDebug(logger, traceOn -> {
            String formatted = LogFormatUtils.formatValue(result, !traceOn);
            return "Resume with async result [" + formatted + "]";
         });
         invocableMethod = invocableMethod.wrapConcurrentResult(result);
      }

      invocableMethod.invokeAndHandle(webRequest, mavContainer);
      if (asyncManager.isConcurrentHandlingStarted()) {
         return null;
      }

      return getModelAndView(mavContainer, modelFactory, webRequest);
   }
   finally {
      webRequest.requestCompleted();
   }
}


好了跟踪调用完毕。