HTTP Status 404如何解决

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee     http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">    <!-- 配置Spring -->    <context-param>        <param-name>contextConfigLocation</param-name>        <param-value>            WEB-INF/classes/com/us/jack/config/applicationContext.xml            WEB-INF/classes/com/us/jack/config/applicationContext-services.xml        </param-value>    </context-param>    <listener>        <listener-class>            org.springframework.web.context.ContextLoaderListener        </listener-class>    </listener>       <!-- 配置Struts2 -->    <filter>        <filter-name>struts2</filter-name>        <filter-class>            org.apache.struts2.dispatcher.FilterDispatcher        </filter-class>    </filter>    <filter-mapping>        <filter-name>struts2</filter-name>        <url-pattern>/*</url-pattern>    </filter-mapping>        <welcome-file-list>        <welcome-file>index.jsp</welcome-file>    </welcome-file-list></web-app>