getHandlerAdapter，获取HandlerAdapter，它包含一个handle方法，负责调用真实的页面处理器进行请求处理并返回一个ModelAndView。HandlerAdpter里面有一些常见的处理，比如消息转移，参数处理等，详见此图：里面的argumentResolvers可以用来处理请求的参数，messageConverts是作消息转换等等。
HandlerAdapter.handle，执行真实页面处理器的处理请求。
请求时序图（只关注HandlerMapping与HandlerAdapter）doDispath获取页面处理器，然后根据页面处理器获取对应的HanlerAdapter，最后由HanlerAdaper来调用页面处理器的方法。
protected void doDispatch(HttpServletRequest request, HttpServletResponse response) throws Exception { //初始化省略 try { ModelAndView mv = null; Exception dispatchException = null; try { processedRequest = checkMultipart(request); multipartRequestParsed = (processedRequest != request); // Determine handler for the current request. mappedHandler = getHandler(processedRequest); if (mappedHandler == null || mappedHandler.getHandler() == null) { noHandlerFound(processedRequest, response); return; } // Determine handler adapter for the current request. HandlerAdapter ha = getHandlerAdapter(mappedHandler.getHandler()); //其它逻辑省略 // Actually invoke the handler. mv = ha.handle(processedRequest, response, mappedHandler.getHandler()); //其它逻辑省略 } catch (Exception ex) { dispatchException = ex; } processDispatchResult(processedRequest, response, mappedHandler, mv, dispatchException); } //异常逻辑省略 }
具体的调用逻辑比较复杂，只选取与HandlerMapping与HandlerAdaper的部分，时序图图如下：
