登录超时给出提示跳到登录页面（ajax、导入、导出）
一、一般页面登录超时验证，可以用过滤器filter，如下：
packagecom.lg.filter;
importjava.io.IOException;
importjavax.servlet.Filter;
importjavax.servlet.FilterChain;
importjavax.servlet.FilterConfig;
importjavax.servlet.ServletException;
importjavax.servlet.ServletRequest;
importjavax.servlet.ServletResponse;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
importcom.lg.func.MyFunc;
publicclassLoginFilterimplementsFilter{
publicvoiddestroy(){
}
publicvoiddoFilter(ServletRequestrequest,ServletResponseresponse,
FilterChainchain)throwsServletException,IOException{
HttpServletRequestrequest1=(HttpServletRequest)request;
HttpServletResponseresponse1=(HttpServletResponse)response;
chain.doFilter(request,response);//放行。让其走到下个链或目标资源中
Stringurl=request1.getServletPath();
System.out.println("Demo1过滤前"+url);
MyFuncmyFunc=newMyFunc(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");
}
publicvoidinit(FilterConfigarg0)throwsServletException{
//TODOAuto-generatedmethodstub
System.out.println("===========init========过滤后");
}
}
web.xml配置
<filter> <filter-name>Demo1Filter</filter-name> <filter-class>com.lg.filter.LoginFilter</filter-class> </filter> <filter-mapping> <filter-name>Demo1Filter</filter-name> <url-pattern>*.jsp</url-pattern> </filter-mapping>
二、ajax提交
提交页面,我的页面提示弹出框架用的asyncBox，可以改成其他的跳转
$.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)){
varobj=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
functioncheckLogin2(msg){
if(msg!=null&&msg.length>0){
if(msg.indexOf("DOCTYPE")>-1){
checkLogin();
returnfalse;
}
}
returntrue;
}
functioncheckLogin(){
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';
});
}
}
后台：
1.处理数据前
if(checkLogin())return;
//检查登录，session过期，或者未登录，自动跳转
publicbooleancheckLogin()throwsIOException{
booleanresult=false;
Stringhtml="";
NativeObjectu=SessionMng.getCurrentUser(request);//检验是否登录超时
if(u==null){
html="<!DOCTYPEHTMLPUBLIC'-//W3C//DTDHTML4.01Transitional//EN''http://www.w3.org/TR/html4/loose.dtd'>\n"+
"<scripttype='text/javascript'src='/admin/js/jquery.min.js'></script>\n"+
"<scripttype='text/javascript'src='/admin/js/common.js'></script>\n"+
"<scripttype='text/javascript'src='/admin/js/dialog/asyncbox.js'></script>\n"+
"<scriptlanguage=javascript>checkLogin();</script>\n";
response.getWriter().println(html);
result=true;
}
returnresult;
}
三、异步导入excel
用AjaxUpload.js导入excel功能
前端提交页面参考上面的；
后台处理页面：
if(!isLogin()){
response.getWriter().print("DOCTYPE");
return;
}
//是否登录
publicbooleanisLogin(){
NativeObjectu=SessionMng.getCurrentUser(request);
if(u!=null){
returntrue;
}else{
returnfalse;
}
}
四。用window.open导出excel文件
后台同二
前端导出页面
functionexport_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
<%@pagecontentType="text/html;charset=utf-8"%>
<%
//========================当前登陆用户信息========================================
if(checkLogin())return;
%>
以上内容给大家介绍了登录超时给出提示跳到登录页面（ajax、导入、导出）的相关知识，希望对大家有所帮助！