struts2登录拦截器代码实例

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";}},