Responsibility chain or Filter mode-using the filter chain

//Filter Interface Public InterfaceFilter { Public voiddoFilter (Request req,response res,filterchain c); }
//client-delivered content to the server//request in the simulated Javaweb Public classRequest { PublicString Requeststr; }//Server feedback content to the client//simulating the response in Javaweb Public classResponse { PublicString Responsestr; }//Filters for HTML Public classHtmlfilter implements filter{@Override Public voidDoFilter (Request req, Response Res,filterchain FC) {Req.requeststr=req.requeststr.replace ("<","["); Req.requeststr=req.requeststr.replace (">","]")+"--htmlfilter"; Fc.dofilter (req, res, FC);
//here it invokes the next filter in the filtering chain//Fc.dofilter (req, res, FC) after the entire filter chain has been processed.//after the processing is done, the following method will be executed res.responsestr+= "--htmlfilter"; //then the filter in turn executes this line of code, and it turns out to be executed in reverse order .res.responsestr+="--htmlfilter"; }  }  //filters for sensitive words Public classSensitivefilter implements filter{@Override Public voidDoFilter (Request req, Response Res,filterchain FC) {Req.requeststr=req.requeststr.replace ("Sensitive","Mingan")+"--sensitivefilter";          Fc.dofilter (req, res, FC); Res.responsestr+="--sensitivefilter"; }  }  //Filter Chain Public classFilterchain implements filter{PrivateList<filter> list=NewArraylist<filter>();  PublicFilterchain AddFilter (filter filter) {List.add (filter); return  This; }      intindex=0; @Override Public voidDoFilter (Request req, Response Res,filterchain FC) {if(Index==list.size ())return; Filter F=list.Get(index); Index++; //execute the next filter in turn until the entire filter chain has finished executingF.dofilter (req, res, FC); }  }  Public classClient {/** Request: Information sent to the server by the client * Response: Server feedback to the client information * The function to be implemented is: the filter that the Request carries with the information that passes through is with the information that Response carries Over the filter opposite*/       Public Static voidMain (string[] args) {Request req=NewRequest (); Response Res=NewResponse (); Req.requeststr="This is one of my sensitive links <a> Youku </a>"; Res.responsestr="Response"; Filterchain FC=NewFilterchain (); Fc.addfilter (NewHtmlfilter ()); Filterchain FC1=NewFilterchain (); Fc1.addfilter (NewSensitivefilter ()); Fc.addfilter (FC1);//Add a filter chain over a filter chainFc.dofilter (req, RES,FC); System. out. println (REQ.REQUESTSTR); System. out. println (RES.RESPONSESTR); }      /** * Execution Result: * This is one of my Mingan links [a] Youku [/a]--htmlfilter--sensitivefilter * response--sensitivefilter--htmlfilte R*/  } 

Responsibility chain or Filter mode-using the filter chain