使用struts2拦截器如何实现对用户进行权限控制

<&#63;xml version="1.0" encoding="UTF-8" &#63;> <!DOCTYPE struts PUBLIC  "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"  "http://struts.apache.org/dtds/struts-2.3.dtd"> <struts>  <package name="hello" extends="struts-default" namespace="/">   <interceptors>    <interceptor name="testInterceptor" class="org.interceptor.InterceptorTest"></interceptor>    <!-- 一个拦截器栈中可以定义多个拦截器 -->    <interceptor-stack name="testStack">     <interceptor-ref name="testInterceptor" />     <interceptor-ref name="defaultStack" />    </interceptor-stack>   </interceptors>   <!--全局结果处理 -->   <global-results>    <result name="error">/Error.jsp</result>   </global-results>   <action name="login" class="org.interceptor.LoginAction">    <result>/WEB-INF/pages/index.jsp</result>   </action>   <action name="admin" class="org.interceptor.LoginAction" method="AdminExecute">    <interceptor-ref name="testStack"></interceptor-ref>    <result>/WEB-INF/pages/admin.jsp</result>   </action>   <action name="vip" class="org.interceptor.LoginAction" method="vipExecute">    <interceptor-ref name="testStack"></interceptor-ref>    <result>/WEB-INF/pages/vipUser.jsp</result>   </action>   <action name="commen" class="org.interceptor.LoginAction" method="commenExecute">    <interceptor-ref name="testStack"></interceptor-ref>    <result>/WEB-INF/pages/commen.jsp</result>   </action>  </package> </struts>