struts2登录拦截器代码实例

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struts.xml

拦截器配置，创建package：

    <package name="loginInterceptor" extends="json-default">    <interceptors>   <interceptor name="myIntercept" class="<span style="font-family: Arial, Helvetica, sans-serif;">com.beyond.kqxt.web.struts.action.</span><span style="font-family: Arial, Helvetica, sans-serif;">login.MyIntercept</span><span style="font-family: Arial, Helvetica, sans-serif;">"></interceptor></span><interceptor-stack name="loginStack">    <interceptor-ref name="myIntercept"/>    <interceptor-ref name="defaultStack"/></interceptor-stack>   </interceptors>   <default-interceptor-ref name="loginStack"></default-interceptor-ref>   <global-results>   <result name="login" type="redirectAction">   <param name="namespace">/authority</param>   <param name="actionName">to_login.m</param>   </result>   </global-results>    </package>

将需要做登录拦截的模块的子struts2.xml文件包含进struts.xml文件中

<include file="struts/struts-pun.xml" />

struts-pun.xml

package继承拦截器loginInterceptor,当进入action方法，就做登录拦截

文件代码如下：

<?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><package name="Pun" namespace="/authority" extends="loginInterceptor">             <action name="punAct" class="punAct"><result name="json" type="json"></result></action></package></struts>

MyInterceptor.java

拦截代码如下：

package com.beyond.kqxt.web.struts.action.login;import java.io.PrintWriter;import java.util.Map;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionInvocation;import com.opensymphony.xwork2.interceptor.Interceptor;public class MyIntercept implements Interceptor {/** * 拦截器执行方法 */@Overridepublic String intercept(ActionInvocation ai) throws Exception {//System.out.println("拦截前。。。");//执行action业务方法Map<String, Object> session=ai.getInvocationContext().getSession();Object admin=session.get("byLoginName");if(admin==null){HttpServletRequest request = ServletActionContext.getRequest();//ajax异步请求的拦截if (request.getHeader("X-Requested-With") != null&& request.getHeader("X-Requested-With").equalsIgnoreCase(     "XMLHttpRequest")) {  System.out.println("ajax请求，用户没登录或登录过期，不能访问");return null;//不是异步请求的拦截} else {System.out.println("http请求，用户没登录或登录过期，不能访问");return "login";}}else{return ai.invoke();}}}

拦截请求在异步ajax请求中，不能重定向到登录页面，

可考虑通过在jsp页面的ajax请求中success方法中添加如下代码;

 success :function(data){if(data==null){alert("登录过期，请重新登录");window.location.href = url+"/authority/frontend/login.jsp";} },

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