url重写

1.先下载jar包.
  http://tuckey.org/urlrewrite/#download
2.web.xml配置。加上：
    <!--URL重写设置-->
    <filter>
    <filter-name>UrlRewriteFilter</filter-name>
    <filter-class>org.tuckey.web.filters.urlrewrite.UrlRewriteFilter</filter-class>
    </filter>
    <filter-mapping>
    <filter-name>UrlRewriteFilter</filter-name>
    <url-pattern>/*</url-pattern>
    </filter-mapping>
3.urlrewrite.xml文件中写规则。如：
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE urlrewrite PUBLIC "-//tuckey.org//DTD UrlRewrite 3.1//EN"
        "http://tuckey.org/res/dtds/urlrewrite3.1.dtd">
<urlrewrite>
  <rule>
      <from>/world/([0-9]+)_([0-9]+).html</from>
      <to>/world.jsp?parent_id=$1&amp;class_id=$2</to>
  </rule>
</urlrewrite>
把world.jsp?parent_id=100&class_id=0改写为world/100_0.html