用户登录页面login.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
request.getSession().setAttribute("user", "has logined");
%>
用户已经登录!
要自定义拦截器需要实现com.opensymphony.xwork2.interceptor.Interceptor接口
package struts2.example.interceptor;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.Interceptor;
public class PermissionInterceptor implements Interceptor {
//在类被摧毁的时候会执行该方法
@Override
public void destroy() {
// TODO Auto-generated method stub
}
//在struts2启动的时候会对拦截器进行实例化
@Override
public void init() {
// TODO Auto-generated method stub
}
//当拦截到action的时候会执行该方法
@Override
public String intercept(ActionInvocation invocation) throws Exception {
//先判断用户是否登录
Object user=ActionContext.getContext().getSession().get("user");
if(user!=null){//user不为空，表示用户已登录
return invocation.invoke();//调用该方法被拦截到的方法就可以执行
}
ActionContext.getContext().put("message", "你没有执行该操作的权限");
return "success";
}
}登录结果页面showInfo.jsp
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
<head>
<title>My JSP 'showInfo.jsp' starting page</title>
</head>
<body>
${message}
</body>
</html><?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<constant name="struts.multipart.maxSize" value="10701096" />
<package name="csdn" namespace="/control" extends="struts-default">
<interceptors>
<interceptor name="permissionInterceptor"
class="struts2.example.interceptor.PermissionInterceptor" />
<interceptor-stack name="permissionInterceptorStack">
<interceptor-ref name="defaultStack" />
<interceptor-ref name="permissionInterceptor" />
</interceptor-stack>
</interceptors>
<global-results>
<result name="success">/WEB-INF/page/showInfo.jsp</result>
</global-results>
<action name="list_*" class="struts2.example.action.FilterAction"
method="{1}">
<interceptor-ref name="permissionInterceptorStack" />
</action>
</package>
</struts>在action里面注册了自定义拦截器后，struts2很多默认的拦截器会被屏蔽掉,也就无法使用struts2很多默认的功能。为了解决这个问题，可定义拦截器栈。在拦截器栈中，定义在前面的先执行，后定义的后执行。 <interceptor-stack name="defaultStack">
<interceptor-ref name="exception"/>
<interceptor-ref name="alias"/>
<interceptor-ref name="servletConfig"/>
<interceptor-ref name="i18n"/>
<interceptor-ref name="prepare"/>
<interceptor-ref name="chain"/>
<interceptor-ref name="debugging"/>
<interceptor-ref name="scopedModelDriven"/>
<interceptor-ref name="modelDriven"/>
<interceptor-ref name="fileUpload"/>
<interceptor-ref name="checkbox"/>
<interceptor-ref name="multiselect"/>
<interceptor-ref name="staticParams"/>
<interceptor-ref name="actionMappingParams"/>
<interceptor-ref name="params">
<param name="excludeParams">dojo\..*,^struts\..*</param>
</interceptor-ref>
<interceptor-ref name="conversionError"/>
<interceptor-ref name="validation">
<param name="excludeMethods">input,back,cancel,browse</param>
</interceptor-ref>
<interceptor-ref name="workflow">
<param name="excludeMethods">input,back,cancel,browse</param>
</interceptor-ref>
</interceptor-stack>
原文：http://blog.csdn.net/lindonglian/article/details/46580691