###org.springframework.web.servlet.DispatcherServlet-doDispatch

/*** 4.预处理,行执行拦截器等*/if (!mappedHandler.applyPreHandle(processedRequest, response)) {return;}/*** 5.实现执行Controller中(Handler)的方法,返回ModelAndView视图*/// Actually invoke the handler.mv = ha.handle(processedRequest, response, mappedHandler.getHandler());if (asyncManager.isConcurrentHandlingStarted()) {/*** 判断 是不是异步请求,是就返回了*/return;}

走了org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter#handle

	public final ModelAndView handle(HttpServletRequest request, HttpServletResponse response, Object handler)throws Exception {return handleInternal(request, response, (HandlerMethod) handler);}

handleInternal方法

org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter#invokeHandlerMethod

	protected ModelAndView invokeHandlerMethod(HttpServletRequest request,HttpServletResponse response, HandlerMethod handlerMethod) throws Exception {ServletWebRequest webRequest = new ServletWebRequest(request, response);try {//获取全局配置的initBinder和当前 Handler-Controller中配置的initBinder用于数据绑定WebDataBinderFactory binderFactory = getDataBinderFactory(handlerMethod);//获取所有ModelAttribute&&RequestMapping的方法,在具体的请求之前先执行ModelFactory modelFactory = getModelFactory(handlerMethod, binderFactory);//将handlerMethod封装为ServletInvocableHandlerMethodServletInvocableHandlerMethod invocableMethod = createInvocableHandlerMethod(handlerMethod);if (this.argumentResolvers != null) {//设置参数解析器invocableMethod.setHandlerMethodArgumentResolvers(this.argumentResolvers);}if (this.returnValueHandlers != null) {//设置结果解析器invocableMethod.setHandlerMethodReturnValueHandlers(this.returnValueHandlers);}invocableMethod.setDataBinderFactory(binderFactory);invocableMethod.setParameterNameDiscoverer(this.parameterNameDiscoverer);//创建 一个ModelAndViewContainer容器ModelAndViewContainer mavContainer = new ModelAndViewContainer();mavContainer.addAllAttributes(RequestContextUtils.getInputFlashMap(request));//调用前的modelFactory中的方法modelFactory.initModel(webRequest, mavContainer, invocableMethod);//设置是否重定向mavContainer.setIgnoreDefaultModelOnRedirect(this.ignoreDefaultModelOnRedirect);//设置异常请求AsyncWebRequest asyncWebRequest = WebAsyncUtils.createAsyncWebRequest(request, response);//异步请求超时时间asyncWebRequest.setTimeout(this.asyncRequestTimeout);//Web异步管理器WebAsyncManager asyncManager = WebAsyncUtils.getAsyncManager(request);//设置线程池asyncManager.setTaskExecutor(this.taskExecutor);asyncManager.setAsyncWebRequest(asyncWebRequest);//回调拦截器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);}//对请求参数进行处理,调用目标HandlerMethods方法,返回一个ModelAndViewinvocableMethod.invokeAndHandle(webRequest, mavContainer);if (asyncManager.isConcurrentHandlingStarted()) {//异步处理就直接返回return null;}//返回ModelAndView,同步判断是否要重定向,还要将flashmanger设置return getModelAndView(mavContainer, modelFactory, webRequest);}finally {webRequest.requestCompleted();}}

org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod#invokeAndHandle

public void invokeAndHandle(ServletWebRequest webRequest, ModelAndViewContainer mavContainer,Object... providedArgs) throws Exception {//执行请求方法,返回结果Object returnValue = invokeForRequest(webRequest, mavContainer, providedArgs);//设置返回状态setResponseStatus(webRequest);if (returnValue == null) {if (isRequestNotModified(webRequest) || getResponseStatus() != null || mavContainer.isRequestHandled()) {disableContentCachingIfNecessary(webRequest);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;}}

org.springframework.web.method.support.InvocableHandlerMethod#invokeForRequest

public Object invokeForRequest(NativeWebRequest request, @Nullable ModelAndViewContainer mavContainer,Object... providedArgs) throws Exception {//获取方法的参数集合Object[] args = getMethodArgumentValues(request, mavContainer, providedArgs);if (logger.isTraceEnabled()) {logger.trace("Arguments: " + Arrays.toString(args));}return doInvoke(args);}

org.springframework.web.method.support.InvocableHandlerMethod#getMethodArgumentValues

protected Object[] getMethodArgumentValues(NativeWebRequest request, @Nullable ModelAndViewContainer mavContainer,Object... providedArgs) throws Exception {//获取方法所有参数,参数名,参数索引,参数类型,注解等属性MethodParameter[] parameters = getMethodParameters();if (ObjectUtils.isEmpty(parameters)) {return EMPTY_ARGS;}//创建一个一样长度的数组用来绑定参数Object[] args = new Object[parameters.length];for (int i = 0; i < parameters.length; i++) {MethodParameter parameter = parameters[i];parameter.initParameterNameDiscovery(this.parameterNameDiscoverer);/*** 调用方提供的参数,不是请求时带来的参数* providedArgs这个东东是空没有值的*/args[i] = findProvidedArgument(parameter, providedArgs);if (args[i] != null) {continue;}//将参数解析器是否支持if (!this.resolvers.supportsParameter(parameter)) {throw new IllegalStateException(formatArgumentError(parameter, "No suitable resolver"));}try {//解析参数并绑定args[i] = this.resolvers.resolveArgument(parameter, mavContainer, request, this.dataBinderFactory);}catch (Exception ex) {// Leave stack trace for later, exception may actually be resolved and handled...if (logger.isDebugEnabled()) {String exMsg = ex.getMessage();if (exMsg != null && !exMsg.contains(parameter.getExecutable().toGenericString())) {logger.debug(formatArgumentError(parameter, exMsg));}}throw ex;}}return args;}

org.springframework.web.method.support.HandlerMethodArgumentResolverComposite#resolveArgument

	public Object resolveArgument(MethodParameter parameter, @Nullable ModelAndViewContainer mavContainer,NativeWebRequest webRequest, @Nullable WebDataBinderFactory binderFactory) throws Exception {//获取参数解析器HandlerMethodArgumentResolver resolver = getArgumentResolver(parameter);if (resolver == null) {throw new IllegalArgumentException("Unsupported parameter type [" +parameter.getParameterType().getName() + "]. supportsParameter should be called first.");}//解析参数return resolver.resolveArgument(parameter, mavContainer, webRequest, binderFactory);}

org.springframework.web.method.annotation.AbstractNamedValueMethodArgumentResolver#resolveArgument

public Object resolveArgument(MethodParameter parameter, @Nullable ModelAndViewContainer mavContainer,NativeWebRequest webRequest, @Nullable WebDataBinderFactory binderFactory) throws Exception {//获取参数解析器HandlerMethodArgumentResolver resolver = getArgumentResolver(parameter);if (resolver == null) {throw new IllegalArgumentException("Unsupported parameter type [" +parameter.getParameterType().getName() + "]. supportsParameter should be called first.");}//解析参数return resolver.resolveArgument(parameter, mavContainer, webRequest, binderFactory);}

org.springframework.web.method.annotation.RequestParamMethodArgumentResolver#resolveName

protected Object resolveName(String name, MethodParameter parameter, NativeWebRequest request) throws Exception {HttpServletRequest servletRequest = request.getNativeRequest(HttpServletRequest.class);if (servletRequest != null) {Object mpArg = MultipartResolutionDelegate.resolveMultipartArgument(name, parameter, servletRequest);if (mpArg != MultipartResolutionDelegate.UNRESOLVABLE) {return mpArg;}}Object arg = null;MultipartRequest multipartRequest = request.getNativeRequest(MultipartRequest.class);if (multipartRequest != null) {List<MultipartFile> files = multipartRequest.getFiles(name);if (!files.isEmpty()) {arg = (files.size() == 1 ? files.get(0) : files);}}if (arg == null) { //从请求去拿出参数String[] paramValues = request.getParameterValues(name);if (paramValues != null) {arg = (paramValues.length == 1 ? paramValues[0] : paramValues);}}return arg;}

org.springframework.web.method.support.InvocableHandlerMethod#doInvoke方法

@Nullableprotected Object doInvoke(Object... args) throws Exception {//获取方法并授权method.setAccessible(true);ReflectionUtils.makeAccessible(getBridgedMethod());try {//反射调用return getBridgedMethod().invoke(getBean(), args);}