在Struts應用中，我們發出的請求都會經過 相應的攔截器進行相關處理，一般都會有一個用戶登錄攔截（Session失效攔截）；一般請求的話，如果Session失效時，我們會跳到登錄頁面，可是如果我們采用AJAX請求時，將會返回登錄頁面的HTML代碼，這肯定不是我們想要的，那麼我們如何解決呢？請看以下步驟：
一、建立攔截器
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; /** * * @author Goma [email protected] * @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); @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、定義全局AJAX請求結束處理方法
//全局的AJAX訪問，處理AJAX清求時SESSION超時
$.ajaxSetup({
contentType:"application/x-www-form-urlencoded;charset=utf-8",
complete:function(XMLHttpRequest,textStatus){
//通過XMLHttpRequest取得響應頭，sessionstatus
var sessionstatus=XMLHttpRequest.getResponseHeader("sessionstatus");
if(sessionstatus=="timeout"){
//這裡怎麼處理在你，這裡跳轉的登錄頁面
window.location.replace(PlanEap.getActionURI("login"));
}
}
});
也就是ajax發送請求時如果攔截返回一個表示就跳轉，否則執行正常操作。