jsp 利用application统计在线人数代码

jsp教程 利用application统计在线人数代码

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

 
 
 
  
 
  <%!
Integer number;//
synchronized void numberVisiter()
{
ServletContext application = getServletContext();
Integer num = (Integer)application.getAttribute("count");
if(num == null)//如果是第一个访问者
{
num = new Integer(1);
application.setAttribute("count",num);
}
else
{
num = new Integer(num.intValue() + 1);
application.setAttribute("count",num);
}
}
  %>
  <%
  if(session.isNew())
  {
  numberVisiter();
  Integer number = (Integer)application.getAttribute("count");
  }
  %>

  简单的页面访问计数器
 

 
  欢迎访问此页面，您是<%=number%>个访问用户