One of the simplest Urlrewrite filters implemented via Java WEB filter

Tools: Java EE-enabled Eclipse IDE

Web filters can be added directly through a dynamic Web project, or directly by creating a Java project by adding classes, see below filter code:

Package Me.ereach.urlfilter;import Java.io.ioexception;import Javax.servlet.filter;import Javax.servlet.filterchain;import Javax.servlet.filterconfig;import Javax.servlet.requestdispatcher;import Javax.servlet.servletexception;import Javax.servlet.servletrequest;import Javax.servlet.servletresponse;import Javax.servlet.annotation.webfilter;import Javax.servlet.http.httpservletrequest;import Javax.servlet.http.HttpServletResponse; @WebFilter (filtername = "Filter01", Urlpatterns = {"/*"}) public class Filter01 Implements Filter {private filterconfig fc;public void init (Filterconfig fconfig) throws servletexception {THIS.FC = fconf IG;} public void DoFilter (ServletRequest request, servletresponse response, Filterchain chain) throws IOException, servletexception {HttpServletRequest HttpRequest = (httpservletrequest) request; HttpServletResponse HttpResponse = (httpservletresponse) response; String ContextPath = Httprequest.getcontextpath (); String Servletpath = Httprequest.getservletpath (); if (SERVLEtpath.startswith ("/hallo/")) {int L = servletpath.length (); String next = ContextPath + servletpath.substring (4); RequestDispatcher dispatcher = Fc.getservletcontext (). Getrequestdispatcher (Next);d Ispatcher.forward (Request, response); return;} else if (Servletpath.startswith ("/welcom/hi/")) {int L = servletpath.length (); String next = ContextPath + servletpath.substring (9); RequestDispatcher dispatcher = Fc.getservletcontext (). Getrequestdispatcher (Next);d Ispatcher.forward (Request, response); return;} Chain.dofilter (request, response);} @Overridepublic void Destroy () {//TODO auto-generated method stub}}

This filter is very simple, all the forwarded URLs are written in the code, so as long as the registration of the filter can be used directly. The following steps are required to use this filter:

1. Export this filter as a jar file.
2. Copy this jar to the Web app's Web-inf/lib
3. Register this jar in Web-inf/web-xml
4. Set Context-root to "/"
5. Restart the Web app for the settings to take effect

One of the simplest Urlrewrite filters implemented via Java WEB filter