Ajax Session失效如何跳转登录页面

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;/*** * @author Goma OMA1989@YEAH.NET* @version v1.0* @since 2012-05-31* */public class SecurityInterceptor extends AbstractInterceptor {private static final long serialVersionUID = 1L;private Logger logger = Logger.getLogger(SecurityInterceptor.class);@Overridepublic String intercept(ActionInvocation invocation) throws Exception {// TODO Auto-generated method stubString 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 PROCESSresponse.setHeader("sessionstatus", ConstantsKey.MSG_TIME_OUT);result = null;} else {// NORMAL REQUEST PROCESSresult = 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;}}

//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"));}}});