超时设置

<%@ page contentType="text/html; charset=UTF-8" %>
<%
//从session中获取用户姓名
String validName = session.getAttribute("userName")==null?"":(String)session.getAttribute("userName");
if("".equals(validName)){
 out.println("<script>window.parent.location='"+request.getContextPath()+"/index.jsp'</script>");
 return;
}
%>