UrlRewriteFilter是一款适用于J2EE应用服务器（如Resin、Orion或Tomcat）的Java Web过滤器，其功能类似于Apache的mod_rewrite，能够帮助开发者进行URL重写。它主要用于保持URL整洁、浏览器检测、日期依赖的重写、内容迁移及生成友好的短链接等。
Based on the popular and very useful mod_rewrite for apache, UrlRewriteFilter is a Java Web Filter for any J2EE compliant web application server (such as Resin, Orion or Tomcat), which allows you to rewrite URLs before they get to your code. It is a very powerful tool just like Apache's mod_rewrite.
URL rewriting is very common with Apache Web Server (see mod_rewrite's rewriting guide) but has not been possible in most java web application servers. The main things it is used for are:
* URL Tidyness / URL Abstraction - keep URLs tidy irrespective of the underlying technology or framework (JSP, Servlet, Struts etc).
* Browser Detection - Allows you to rewrite URLs based on request HTTP headers (such as user-agent or charset).
* Date based rewriting - Allows you to forward or redirect to other URL's based on the date/time (good for planned outages).
* Moved content - enable a graceful move of content or even a change in CMS.
* Tiny/Friendly URL's (i.e. blah.com/latest can be redirected to blah.com/download/ver1.2.46.2/setup.exe)
* A Servlet mapping engine (see Method Invocation)
UrlRewriteFilter uses an xml file, called urlrewrite.xml (it goes into the WEB-INF directory), for configuration. Most parameters can be Perl5 style Regular Expressions or Wildcard Expressions. This makes it very powerful indeed.
URL rewriting is very common with Apache Web Server (see mod_rewrite's rewriting guide) but has not been possible in most java web application servers. The main things it is used for are:
* URL Tidyness / URL Abstraction - keep URLs tidy irrespective of the underlying technology or framework (JSP, Servlet, Struts etc).
* Browser Detection - Allows you to rewrite URLs based on request HTTP headers (such as user-agent or charset).
* Date based rewriting - Allows you to forward or redirect to other URL's based on the date/time (good for planned outages).
* Moved content - enable a graceful move of content or even a change in CMS.
* Tiny/Friendly URL's (i.e. blah.com/latest can be redirected to blah.com/download/ver1.2.46.2/setup.exe)
* A Servlet mapping engine (see Method Invocation)
UrlRewriteFilter uses an xml file, called urlrewrite.xml (it goes into the WEB-INF directory), for configuration. Most parameters can be Perl5 style Regular Expressions or Wildcard Expressions. This makes it very powerful indeed.
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