Java Create filter parsing XML file

Today I wrote a filter demo, now parsing the Actions.xml file, getting the business rules in action; no need to import any jar packages

Actionfilter Filter Class:

 Packageaccp.com.xh.utils;Importjava.io.IOException;ImportJava.io.InputStream;ImportJavax.servlet.Filter;ImportJavax.servlet.FilterChain;ImportJavax.servlet.FilterConfig;Importjavax.servlet.ServletException;Importjavax.servlet.ServletRequest;ImportJavax.servlet.ServletResponse;Importjavax.servlet.http.HttpServletRequest;ImportJavax.servlet.http.HttpServletResponse;Importjavax.xml.parsers.DocumentBuilderFactory;Importorg.w3c.dom.Document;Importorg.w3c.dom.Element;Importorg.w3c.dom.NodeList;/*** Create filter * The front controller receives all parameters, formats the encoding, controls the login to intercept; distribute requests *@authorXiaohua **/ Public classActionfilterImplementsfilter{/*** Tomcat executes at startup and executes only once; * Parsing the configured rules file: Actions.xml*/@Override Public voidInit (filterconfig config)throwsservletexception {Try {            //Get Action.xml fileInputStream is =Thread.CurrentThread (). Getcontextclassloader (). getResourceAsStream ("Actions.xml"); //Parsing XML FilesDocument document =documentbuilderfactory.newinstance (). Newdocumentbuilder (). Parse (IS); //Get action tag element: <action name= "pro_.*" class= "xxxxxaction" >NodeList NodeList = document.getelementsbytagname ("Action");  for(inti = 0; I<nodelist.getlength (); i++){                //Parse action tag elementElement actionelement =(Element) Nodelist.item (i); String ActionName= Actionelement.getattribute ("name"); String Actionclass= Actionelement.getattribute ("Class"); System.out.println ("ActionName Property:" +actionname); System.out.println ("Actionclass Property:" +Actionclass); //gets the result tag element//<result name= "Reload" type= "redirect" >product</result>NodeList resultlist = actionelement.getelementsbytagname ("Result");  for(intJ=0;j<resultlist.getlength (); j + +) {Element Resultel=(Element) Resultlist.item (j); String Resultname= Resultel.getattribute ("name");//Get the result Name property in Action.xmlString Resulttype = Resultel.getattribute ("type"); System.out.println ("Name attribute:" +resultname); System.out.println ("Type attribute:" +Resulttype); }                            }        } Catch(Exception e) {Throw NewRuntimeException ("Error parsing action.xml file:" +e.getmessage ()); }    }        /*** Each request will be executed by the filter, * According to the requested URL to find the corresponding processing xxxaction, determine which method processing*/@Override Public voidDoFilter (servletrequest request, servletresponse response, Filterchain chain)throwsIOException, servletexception {httpservletrequest req=(httpservletrequest) request; HttpServletResponse resp=(httpservletresponse) response;//resp.sendredirect ("");    }    /*** Normal stop Tomcat execution, will only be executed once; * Destruction of resource operations,*/@Override Public voiddestroy () {}}

Actions.xml file

<?XML version= "1.0" encoding= "UTF-8"?><!--Defining Business Rules -<Actions>    <Actionname= "pro_.*"class= "Xxxxxaction">        <resultname= "List">/web-inf/view/list.jsp</result>        <resultname= "Edit"type= "Redirect">/web-inf/view/edit.jsp</result>        <resultname= "Reload"type= "Redirect">Product</result>    </Action></Actions>

The values of the elements that are output when the server is started:

Of course, don't forget. Configuration mappings in Web. XML are specified in the Actionfilter class, so output is only available when the service is started.

Java Create filter parsing XML file