Struts2中拦截器

package com.zhangpn.Intercepor;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.Interceptor;

public class PermissionIntercepor implements Interceptor{

	@Override
	public void destroy() {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void init() {
		// TODO Auto-generated method stub
		
	}

	@Override
	public String intercept(ActionInvocation arg0) throws Exception {
		// TODO Auto-generated method stub
		return null;
	}
}

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
	"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
	"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
	<constant name="struts.multipart.saveDir" value="/tmp"/>
    <package name="default" namespace="/" extends="struts-default">
    	<interceptors>
    		<interceptor name="PERMIT" class="com.zhangpn.Intercepor.PermissionIntercepor"></interceptor>
    	</interceptors>
    	<action name="index" class="com.zhangpn.struts2.Uploadfile">
    		<interceptor-ref name="PERMIT"/>
            <result name="success">welcome.jsp</result>
            <result name="error">error.jsp</result>
        </action>
    </package>
</struts>