学步园

１、什么是Url Rewrite Filter，　Url Rewrite Filter可以用来做什么？

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

２、参考资料

http://tuckey.org/urlrewrite/　官方站点

http://code.google.com/p/urlrewritefilter/　goole code 目前下载已经移到这上面了。

３、如何使用

3.1、安装 jar

　　下载 urlrewrite-3.2.0.jar 并将其复制到WEB-INF/lib目录

3.2、配置web.xml

　　基本上复制以下代码就可以了：

<filter><br /> <filter-name>UrlRewriteFilter</filter-name><br /> <filter-class>org.tuckey.web.filters.urlrewrite.UrlRewriteFilter</filter-class><br /> </filter><br /> <filter-mapping><br /> <filter-name>UrlRewriteFilter</filter-name><br /> <url-pattern>/*</url-pattern><br /> </filter-mapping><br />

3.3、配置rule重写规则

将用户访问的伪地址转成真实的地址。

<rule><br /> 　　<from>^/([a-zA-Z0-9/-]{36}).shtml$</from><br /> 　　<to>/News.do?method=view&uuid=$1</to><br /> </rule>

访问from配置节，实际上访问的是to配置节

3.4、配置outbound-rule重写规则

将页面上的真实地址，转换成伪地址，用此配置节，可以使程序和配置之间达到透明，程序唯一要做的是将要映射的地址

Using the example above JSP's with the code<br /> <a href="<%= response.encodeURL(" mce_href="&lt;%= response.encodeURL("/world.jsp?country=usa&amp;city=nyc") %>">nyc</a><br /> will output<br /> <a href="/world/usa/nyc" mce_href="world/usa/nyc">nyc</a> </p> <p>Or JSTL<br /> <a href="<c:url value=" mce_href="<c:url value="/world.jsp?country=${country}&amp;city=${city}" ></a>">nyc</a><br /> will output<br /> <a href="/world/usa/nyc" mce_href="world/usa/nyc">nyc</a> </p> <p>Note, If you are using JSTL (ie, <c:url) this will work also.<br />

注意：<c:url 中不能将&换成&amp;官方文档是错的！

<outbound-rule><br /> 　　<from>^/News.do/?method=view&amp;uuid=([a-zA-Z0-9/-]{36})$</from><br /> 　　<to>/$1.shtml</to><br /> </outbound-rule>

注意：此配置?要换成/?  &要换成&amp;