(FrameworkServlet)processRequest
(DispatcherServlet) mappedHandler = this.getHandler(processedRequest);
(FrameworkServlet)doService
(DispatcherServlet)HandlerExecutionChain handler = hm.getHandler(request);
(DispatcherServlet)HandlerAdapter ha = this.getHandlerAdapter(mappedHandler.getHandler());
开始
(FrameworkServlet)doget或dopost
(DispatcherServlet)doService
(DispatcherServlet)doDispatch
