Ajax Session失效跳转登录页面的方法

前端技术 2023/09/01 AJAX

在Struts应用中,我们发出的请求都会经过 相应的拦截器进行相关处理,一般都会有一个用户登录拦截(Session失效拦截);一般请求的话,如果Session失效时,我们会跳到登录页面,可是如果我们采用AJAX请求时,将会返回登录页面的HTML代码,这肯定不是我们想要的,那么我们如何解决呢?请看以下步骤:

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;
/**
* 
* @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);
@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\"));
}
}
});

也就是ajax发送请求时如果拦截返回一个表示就跳转,否则执行正常操作。

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