//session清除
session.invalidate();	






//session检测 	Users us = (Users) session.getAttribute("loginuser");	if (null != us) {		java.util.Hashtable htb = (java.util.Hashtable) application.getAttribute("MemberList");		if(htb != null){			String loginid = (String) htb.get(us.getLoginid());			if (session.getId().equals(loginid)) {				out.print("");			} else {				session.removeAttribute("loginuser");				session.invalidate();			}		}	}//清除页面缓存，直接写页面上	response.setHeader("Cache-Control","no-store");	response.setHeader("Pragma","no-cache");	response.setDateHeader ("Expires", 0);