SPRINGMVC Study Notes (4)-Front Controller

SPRINGMVC Study Notes (4)-Front Controller

• SPRINGMVC Learning Note 4-Front Controller

In this paper, through the Front Controller source code Analysis SPRINGMVC execution Process

1. Front Controller receives request

Calling doDispatch methods

protectedvoiddoDispatchthrows Exception {        HttpServletRequest processedRequest = request;        null;        booleanfalse;         。。。。。}

2. Front-end controller call HandlerMapping (processor mapper) find handler based on URL

// Determine handler for the current request.mappedHandler = getHandler(processedRequest);

/** * Return The Handlerexecutionchain for this request.     * <p>tries All handler mappings in order. * @param Request current HTTP request * @return The Handlerexecutionchain, or {@code null} if no Han Dler could be found * /    protectedHandlerexecutionchainGetHandler(HttpServletRequest request)throwsException { for(Handlermapping HM: This. handlermappings) {if(Logger.istraceenabled ()) {Logger.trace ("Testing handler map ["+ HM +"] in Dispatcherservlet with Name '"+ getservletname () +"'"); } Handlerexecutionchain handler = Hm.gethandler (request);if(Handler! =NULL) {returnHandler }        }return NULL; }

3. Call the processor adapter to execute the handler and get the result of executionModelAndView mv

In the doDispatch method

// Actually invoke the handler.mv = ha.handle(processedRequest, response, mappedHandler.getHandler());

4. View rendering, populating the model data into the request domain

doDispatch, processDispatchResultrender

In the render method, the view is parsed to get view

// We need to resolve the view name.view = resolveViewName(mv.getViewName(), mv.getModelInternal(), locale, request);

Call the Render method of view to populate the request domain with the model data

In a render method, the View method that invokes the interface render

view.render(mv.getModelInternal(), request, response);

Program I also did not read, feeling analysis is relatively shallow, a lot of still did not understand, and so I system read the source code will tidy up a better.

Author @brianway More articles: personal website | CSDN | Oschina

SPRINGMVC Study Notes (4)-Front Controller