web-xml写法要求1

<?xml version="1.0" encoding="ISO-8859-1"?>

<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee web-app_2_4.xsd"
    version="2.4">

  <display-name>Welcome to Tomcat</display-name>
  <description>
     JSP应用开发详解
  </description> 
    <filter>
     <filter-name>encoding</filter-name>
     <filter-class>com.jspdev.ch8.EncodingFilter</filter-class>
     <init-param>
             <param-name>encoding</param-name>
             <param-value>gb2312</param-value>
     </init-param>
    </filter>
    <filter>
     <filter-name>auth</filter-name>
           <filter-class>com.jspdev.ch8.SignonFilter</filter-class>
    </filter>
   
    <filter-mapping>
       <filter-name>encoding</filter-name>
       <url-pattern>/*</url-pattern>  //对在TOMCAT的文件下的所有东西有用
     </filter-mapping>
    
    <filter-mapping>
       <filter-name>auth</filter-name>
       <url-pattern>/security/*</url-pattern>  //只对security文件下的东西有用
   </filter-mapping>
    
    <filter-mapping>
       <filter-name>auth</filter-name>
       <url-pattern>/admin/*</url-pattern>  //只对admin文件下的东西有用
   </filter-mapping>
  
  
</web-app>