Java Web Base---URL redirection filter

Java Web Base---URL redirection filter

Httprequest.getrequestdispatcher ("/helloworld"). Forward (HttpRequest, response);

Server-side forwarding, does not change the browser-side URL address, commonly used

Httpresponse.sendredirect (URI);

Browser end multiplicity Redirect, change URL in browser address bar

Urloverwritefilter.java

1  PackageCom.web1.util;2 3 Importjava.io.IOException;4 5 Importjavax.print.attribute.standard.ReferenceUriSchemesSupported;6 ImportJavax.servlet.Filter;7 ImportJavax.servlet.FilterChain;8 ImportJavax.servlet.FilterConfig;9 Importjavax.servlet.ServletException;Ten Importjavax.servlet.ServletRequest; One ImportJavax.servlet.ServletResponse; A ImportJavax.servlet.annotation.WebFilter; - Importjavax.servlet.http.HttpServletRequest; - ImportJavax.servlet.http.HttpServletResponse; the  - /** - * Servlet Filter implementation class Urloverwritefilter -  */ +@WebFilter ("/urloverwritefilter") -  Public classUrloverwritefilterImplementsFilter { +  A     Privatefilterconfig config; at     /** - * Default constructor. -      */ -      PublicUrloverwritefilter () { -         //TODO auto-generated Constructor stub -     } in  -     /** to      * @seeFilter#destroy () +      */ -      Public voiddestroy () { the         //TODO auto-generated Method Stub *     } $ Panax Notoginseng     /** -      * @seeFilter#dofilter (ServletRequest, Servletresponse, Filterchain) the      */ +      Public voidDoFilter (ServletRequest request, servletresponse response, Filterchain chain)throwsIOException, servletexception { A         //Do something theString uri = ""; +HttpServletRequest HttpRequest =NULL; -         if(Requestinstanceofhttpservletrequest) { $HttpRequest =(httpservletrequest) request; $System.out.println ("URL:" +Httprequest.getrequesturl (). toString ()); -System.out.println ("URI:" +Httprequest.getrequesturi (). toString ()); -URI =Httprequest.getrequesturi (); theURI = Uri.replace ("home.html", "HelloWorld"); -         }Wuyi         if(Httprequest.getrequesturi (). IndexOf ("home.html") >= 0) { the             /*if (response instanceof HttpServletResponse) { - httpservletresponse HttpResponse = (httpservletresponse) response; Wu Httpresponse.sendredirect (URI); -             }*/ AboutHttprequest.getrequestdispatcher ("/helloworld"). Forward (HttpRequest, response); $         } -         Else{ -             //go to next Filter - Chain.dofilter (request, response); A         } +     } the  -     /** $      * @seefilter#init (filterconfig) the      */ the      Public voidInit (Filterconfig fconfig)throwsservletexception { the          This. config =Fconfig; the     } -  in}

Xml

In accordance with the order of filter-mapping

<?xml version= "1.0" encoding= "UTF-8"? ><web-app xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance" xmlns= "Http://java.sun.com/xml/ns/javaee" xsi:schemalocation= "Http://java.sun.com/xml/ns/javaee/http Java.sun.com/xml/ns/javaee/web-app_3_0.xsd "metadata-complete=" true "version=" 3.0 "> <description>Hello World Servlet</description> <display-name>hello World servlet</display-name> <filter> <filter-name >encode filter</filter-name> <filter-class>com.web1.util.requestencodefilter</filter-class> </filter> <filter-mapping> <filter-name>encode filter</filter-name> &LT;URL-PATTERN&G T/*</url-pattern> </filter-mapping> <filter> <filter-name>urloverfilter Filter</filter-nam E> <filter-class>com.web1.util.URLOverWriteFilter</filter-class> </filter> < filter-mapping> <filter-name>urloverfilter filter</filter-name> <url-pattern>/home.html</ url-pattern> </filter-mapping> <servlet> <servlet-name>helloWorld</servlet-name> <    Servlet-class>com.web1.hello.helloworldservlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>helloWorld</servlet-name> <url-pattern>/helloWorld</url-pattern> </ servlet-mapping> <servlet> <servlet-name>helloImage</servlet-name> <servlet-class> com.web1.hello.imageservlet</servlet-class> </servlet> <servlet-mapping> <servlet-name> Helloimage</servlet-name> <url-pattern>/helloimage</uRl-pattern> </servlet-mapping></web-app> 

Java Web Base---URL redirection filter