Ajax通讯时，检查Session是否过期

来源：互联网发布：paxos一致性算法编辑：程序博客网时间：2024/05/21 07:52

场景：ajax通讯模式下，客户端校验Session是否过期。

实现：这里用到一个拦截器，检查Session中的用户是否存在

public class LoginFilter extends AbstractInterceptor{private static final long serialVersionUID = 1L;private Logger logger =Logger.getLogger(LoginFilter.class.getName());private static String Error = "errorLogin";private String msg ;public String getMsg() {return msg;}public void setMsg(String msg) {this.msg = msg;}@Overridepublic String intercept(ActionInvocation arg0) throws Exception {logger.debug("...LoginFilter开始载拦...");//取得请求的action实例ActionContext ctx = arg0.getInvocationContext();//取得提交URIHttpServletRequest request = (HttpServletRequest)ctx.get(ServletActionContext.HTTP_REQUEST);HttpServletResponse response = (HttpServletResponse)ctx.get(ServletActionContext.HTTP_RESPONSE);String actionName = ctx.getContext().getName();if("goAIOPortal".equals(actionName)||"goRealware".equals(actionName)||"loginCheck".equals(actionName)||"loginCh".equals(actionName)||"ukeyloginCheck".equals(actionName)||"loginCheckPass".equals(actionName)) {return arg0.invoke();}//获取sessionlogger.debug("...LoginFilter：判断用户登录...");Map<String,Object> session =ctx.getSession();//异步传输if (request.getHeader("x-requested-with") != null && request.getHeader("x-requested-with").equalsIgnoreCase("XMLHttpRequest")) {  if (session.get("user") == null) {//if(!autoLogin(session,request)){msg = "用户未登录或登录超时,请重新登录！";logger.debug("用户未登录,重新登录！");//request.setAttribute("msg", msg);response.setContentType("text/json;charset=UTF-8");response.setHeader("Cache-Control", "no-cache");PrintWriter pw = null;try {pw = response.getWriter();pw.write("overdue");} catch (IOException e) {throw new EVoucherException("获取http写入流异常" + e.getMessage());} finally {if (pw != null) {pw.close();}}return null;//}}else{return arg0.invoke();}//同步传输}else{if (session.get("user") == null) {logger.debug("用户未登录,重新登录！");return Action.LOGIN;}else{return arg0.invoke();}}}//自动登陆private boolean autoLogin(Map<String,Object> session, HttpServletRequest request){return false;}}

然后在检测的时候判断执行以下方法就行了。

/** * ajax通讯模式下，客户端校验Session是否过期。 * @param msg */function checkSessionOverdue(msg){if (msg == 'overdue'){alert("登录时间过长，将重新登录！！")window.top.location.href = '/realware/jsp/common/Login.jsp';}}

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