ajax Session失效如何跳转到登录页面

一、建立拦截器

package com.xxx.planeap.interceptor;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.Logger;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionContext;

import com.opensymphony.xwork2.ActionInvocation;

import com.opensymphony.xwork2.ActionSupport;

import com.opensymphony.xwork2.interceptor.AbstractInterceptor;

import com.xxx.common.contants.ConstantsKey;

import com.xxx.common.contants.SessionKey;

import com.xxx.planeap.domain.User;

import com.xxx.planeap.security.SecurityContextUtil;

public class SecurityInterceptor extends AbstractInterceptor {

    private static final long serialVersionUID = 1L;

    private Logger logger = Logger.getLogger(SecurityInterceptor.class);

    @Override

    public String intercept(ActionInvocation invocation) throws Exception {

        // TODO Auto-generated method stub

        String className = invocation.getAction().getClass().getName();

        String action = className.substring(className.lastIndexOf(".")+1,className.length());

        String actionName = invocation.getProxy().getActionName();

        

        String result;

        HttpServletRequest request = ServletActionContext.getRequest();

        HttpServletResponse response = ServletActionContext.getResponse();

        String type = request.getHeader("X-Requested-With");

        User user = (User) ActionContext.getContext().getSession().get(SessionKey.CURRENT_USER);

        if (user == null) {

            logger.debug("SECURITY CHECKED: NEED TO LOGIN");

            if ("XMLHttpRequest".equalsIgnoreCase(type)) {// AJAX REQUEST PROCESS

                response.setHeader("sessionstatus", ConstantsKey.MSG_TIME_OUT);

                result = null;

            } else {// NORMAL REQUEST PROCESS

                result = ActionSupport.LOGIN;

            }

        } else {

            logger.debug("SECURITY CHECKED: USER HAS LOGINED");

            SecurityContextUtil.setCurrentUser(user);

            boolean hanPerm = SecurityContextUtil.hasPerm(action, actionName);

            logger.debug("SECURITY CHECKED: PERMISSION---"+action+"."+actionName+"="+hanPerm);

            result = invocation.invoke();

        }

        return result;

    }

}

二、定义全局AJAX请求结束处理方法

//全局的AJAX访问，处理AJAX清求时SESSION超时

$.ajaxSetup({

    contentType:"application/x-www-form-urlencoded;charset=utf-8",

    complete:function(XMLHttpRequest,textStatus){

          //通过XMLHttpRequest取得响应头，sessionstatus           

          var sessionstatus=XMLHttpRequest.getResponseHeader("sessionstatus"); 

          if(sessionstatus=="timeout"){

               //这里怎么处理在你，这里跳转的登录页面

               window.location.replace(PlanEap.getActionURI("login"));

       }

    }

});