struts2.2.3部署到tomcat上无法访问求解

web.xml代码：
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.
    xmlns:xsi="http://www.
    xsi:schemaLocation="http://java.
    http://java.
    <filter>
        <filter-name>struts2.2.3</filter-name>
        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>struts2.2.3</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>
struts.xml代码：<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN"
    "http://struts.
    <struts>
        <package name="demo" namespace="/demo" extends="struts-default" >
            <action name="demo1" class="com.ren.DemoAction">
                <result name="suc">/index.jsp</result>
            </action>
        </package>
        
    </struts>
DemoAction.java:
public class DemoAction {
    public String execute(){
        return "suc";
    }
}
TOMCAT版本6.0，直接解压缩的什么也没改，部署项目也成功了，就是当我用路径http://localhost:8080/demo2/demo/demo1访问ACTION时总是404这是为什么，无语了。