登录超时给出提示跳到登录页面（ajax、导入、导出）

 package com.lg.filter; import java.io.IOException; import javax.servlet.Filter; import javax.servlet.FilterChain; import javax.servlet.FilterConfig; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.lg.func.MyFunc; public class LoginFilter implements Filter{ public void destroy() { } public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws ServletException, IOException { HttpServletRequest request1=(HttpServletRequest)request; HttpServletResponse response1=(HttpServletResponse)response; chain.doFilter(request, response);//放行。让其走到下个链或目标资源中 String url=request1.getServletPath(); System.out.println("Demo1过滤前"+url); MyFunc myFunc = new MyFunc(request1,response1); System.out.println("Demo1过滤前"+url.startsWith("/index/")); if(myFunc.checkLogin2()&&!url.startsWith("/index/")){ response1.sendRedirect("/index_login.html"); } System.out.println("Demo1过滤后"); } public void init(FilterConfig arg0) throws ServletException { // TODO Auto-generated method stub System.out.println("===========init========过滤后"); } }

  Demo1Filtercom.lg.filter.LoginFilter Demo1Filter*.jsp

 $.ajax({ type: "post", url:"a.jsp", async:false,//同步 data:{"name":"fdgh"} success:function(msg){ //checkLogin2(msg)判断是否登录超时，超时返回false，跳到登录页面 if(checkLogin2(msg)){ var obj=eval('('+msg+')'); if(obj.result.indexOf("suc")>-1){ alert("成功"); }else{ alert("失败"); } } }); //是否登录超时，超时返回false，跳到登录页面 function checkLogin2(msg){ if(msg!=null&&msg.length>0){ if(msg.indexOf("DOCTYPE")>-1){ checkLogin(); return false; } } return true; } function checkLogin(){ if(window.top != window.self){ top.asyncbox.alert('登录超时，请重新登录', '提示', function(action){ top.location.href='/login.jsp'; }); }else{ asyncbox.alert('登录超时，请重新登录', '提示', function(action){ window.location.href='/login.jsp'; }); } }

 if(checkLogin())return; //检查登录，session过期，或者未登录，自动跳转 public boolean checkLogin() throws IOException{ boolean result = false; String html = ""; NativeObject u = SessionMng.getCurrentUser(request);//检验是否登录超时 if (u == null){ html = "

 if(!isLogin()){ response.getWriter().print("DOCTYPE"); return ; } //是否登录 public boolean isLogin(){ NativeObject u = SessionMng.getCurrentUser(request); if (u != null){ return true; }else{ return false; } }

 function export_excel(){ $.ajax({ type: "post", url:"/admin/inc/checkLogin.jsp", async:false,//同步 success:function(msg){ if(checkLogin2(msg)){ window.open("perfm_excel.jsp?"+$('#Form1').serialize()); } } }); login.jsp < page contentType="text/html; charset=utf-8"