1、前台ext

??? ??? Ext.Ajax.on('requestcomplete',function checkUserSessionStatus(conn,response,options){
??? ??? ??? ??? //Ext重新封装了response对象
??? ??? ??? ??? if(response.getResponseHeader('Timeout') == 'true'){
??? ??? ??? ??? //发现请求超时，退出处理代码...
??? ??? ??? ??? ??? Ext.MessageBox.confirm('Confirm', "Your session has time out, please log on again.", function(btn, text){
??? ??? ??? ??? ??? ??? ??? ??? ?window.location.href="login.jsp";
??? ??? ??? ??? ??? ??? ??? ??? ?}
??? ??? ??? ??? ??? );
??? ??? ??? ??? }
??? ??? }, this);

2、后台filter：

public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
??? ??? // pass the request along the filter chain
??? ??? logger.info("LoginFiler..beginAdd....");
??? ??? HttpServletRequest req = (HttpServletRequest)request;
??? ??? HttpServletResponse res = (HttpServletResponse)response;
??? ??? String servletPath = req.getServletPath();?
??? ??? System.out.println("ServletPath: "+req.getServletPath() +" req.getRequestURI(): "+req.getRequestURI() +" getContextPath: "+req.getContextPath());
??? ??? if(req.getSession().getAttribute("userInfo")!=null||servletPath.equals("/loginAction.action")||servletPath.equals("/login.jsp"))
??? ??? {
??? ??? ??? System.out.println("continue....");
??? ??? ??? chain.doFilter(request,response) ;
??? ??? }
??? ??? else if(servletPath.contains(".action"))//
??? ??? {
??? ??? ??? res.addHeader("Timeout", "true");
??? ??? ??? request.getRequestDispatcher("/jsp/common/outOfTime.jsp").forward(req,res);
??? ??? }
??? ??? else{
??? ??? ??? request.getRequestDispatcher("/login.jsp").forward(request,response);
//??? ??? ??? res.sendRedirect(req.getContextPath()+"/login.jsp");
??? ??? }
??? }