web.xml

jsp,过滤器和监听器的简单例子

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" 
	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 
	http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
  
  <filter>
    <filter-name>loginFilter</filter-name>
    <filter-class>MyPackage.loginFilter</filter-class>
    <init-param>
      <param-name>login_uri</param-name>
      <param-value>login.jsp</param-value>
    </init-param>
    <init-param>
      <param-name>index_uri</param-name>
      <param-value>index.jsp</param-value>
    </init-param>
    <init-param>
      <param-name>login_servlet_name</param-name>
      <param-value>MyPackage.FilterListenerServlet</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>loginFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
  <listener>
    <listener-class>MyPackage.OnlineListener</listener-class>
  </listener>
  <servlet>
    <description>This is the description of my J2EE component</description>
    <display-name>This is the display name of my J2EE component</display-name>
    <servlet-name>FilterListenerServlet</servlet-name>
    <servlet-class>MyPackage.FilterListenerServlet</servlet-class>
  </servlet>

  <servlet-mapping>
    <servlet-name>FilterListenerServlet</servlet-name>
    <url-pattern>/servlet/FilterListenerServlet</url-pattern>
  </servlet-mapping>
</web-app>