STRUS2 Study Notes-process

Starting STRUTS2 requires a filter to be configured in Web. XML:

<filter> <filter-name>action</filter-name> <filter-class> ORG.APACHE.STRUTS2.DISPATC Her.ng.filter.StrutsPrepareAndExecuteFilter </filter-class> </filter> <filter-mapping> < Filter-name>action</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>

When a user sends a request from the browser to the server, it first passes through the filter: Strutsprepareandexecutefilter

 //initialization, primarily instantiation of prepare and execute Dispathcher public void init (filterconfig filterconfig)  throws ServletException {              .             .                dispatcher =  Init.initdispatcher (config);             prepare  = new prepareoperations (Filterconfig.getservletcontext (),  dispatcher);//             execute = new executeoperations ( Filterconfig.getservletcontext (),  dispatcher);             this.excludedpatterns = init.buildexcludedpatternslist (Dispatcher);              postinit (dispatcher, filterconfig);//The method is empty, mainly left to developers to expand              .            .                      }    //     public void dofilter ( Servletrequest req, servletresponse res, filterchain chain)  throws  Ioexception, servletexception {        httpservletrequest  request =  (HttpServletRequest)  req;         httpservletresponse response =  (HttpServletResponse)  res;         try {        //Direct Release if user requests do not reach the action              if  (excludedpatterns != null && prepare.isurlexcluded ( Request, excludedpatterns))  {                 chain.dofilter (Request, response);             } else {                 prepare.setencodingandlocale (Request, response);                  Prepare.createactioncontext (request, response);//Create  actioncontext                 prepare.assigndispatchertothread ();// Put the Actioncontext in the threadlocal local thread                  request = prepare.wraprequest (Request),                 // The creation of Actionmapper mainly includes some request forwarding information, it will first go to the current request to find                  //if found, it is stored in the request domain and is created if not found. (Defaultactionmapper)                  actionmapping mapping = prepare.findactionmapping (request, response, true );                if  ( Mapping == null)  {                     boolean handled =  Execute.executestaticresourcerequest (Request, response);                     if  (!handled)  {  & Nbsp;                      chain.dofilter (Request, response);                     }                 } else {                 //If the filter does not have a square line after performing the action, So the struts filter can only be placed at the end of the                      execute.executeaction (request, response, mapping);//Perform action                  }             }        }  finally {             prepare.cleanuprequest (Request);         }                / /Create actioncontext          public actioncontext  Createactioncontext (Httpservletrequest request, httpservletresponse response)  {         ActionContext ctx;         Integer counter = 1;        Integer  oldcounter =  (Integer)  request.getattribute (cleanup_recursion_counter);         if  (oldcounter != null)  {             counter = oldCounter + 1;         }   &Nbsp;            actioncontext oldcontext  = actioncontext.getcontext ();//Get the original Actioncontext (if present)          if  (oldcontext != null)  {             //  Create a new ActionText and transfer the original context into the              ctx = new actioncontext (New hashmap<string, object> ( Oldcontext.getcontextmap ()));        } else {         //Create a valuestack         with Factory mode     valuestack stack = dispatcher.getcontainer (). GetInstance ( Valuestackfactory.class). Createvaluestack ();             //creates a Map collection (context) from the dispatcher and valuestack its methodContext to             //so there is a context index in the STATCK value stack             stack.getcontext (). PUTALL ( Dispatcher.createcontextmap (request, response, null, servletcontext));             ctx = new actioncontext (Stack.getContext ());         }         Request.setattribute (Cleanup_recursion_counter, counter);         Set Actioncontext        actioncontext.setcontext (CTX);         return ctx;    }         //Executive      Configuration config =  Configurationmanager.getconfiguration ();//Create a proxy object based on the configuration file             actionproxy proxy =  Config.getcontainer (). getinstance (Actionproxyfactory.class). Createactionproxy (                     namespace, name ,  method, extracontext, true, false);             request.setattribute (servletactioncontext.struts_valuestack_key,  Proxy.getinvocation (). Getstack ());             //  if the ActionMapping says to go straight to a result,  do it!            if  (Mapping.getResult ( )  != null)  {                 result result = mapping. GetResult ();//If the result is returned, the interceptor post-processing process is called recursively                  result.execute (Proxy.getinvocation ());             } else {                 proxy.execute ();//Call actioninvocation Call Interceptor              }

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STRUS2 Study Notes-process