统计在线人数

1         ServletContext sc = this.getServletContext();
2         Long personCount = (Long)sc.getAttribute("personCount");
3         if(personCount==null){
4             personCount=(long)0;
5             sc.setAttribute("personCount", personCount);
6             
7         }
8         sc.setAttribute("personCount", (personCount+1));
9         System.out.println("当前在线人数："+sc.getAttribute("personCount"));
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原文地址：https://www.cnblogs.com/pxffly/p/7465818.html