JSP application. Setattribute() method: set attribute

• Java

setAttribute(String name,Object object)

Example

<%
  application.setAttribute("user","lzw");
  Date Now = new Date();
  application.setAttribute("Now",Now);
%>

Typical application

<body>
  <p>application实现简单计数器<br>
    <%
       Integer count = null;  //定义用于表示计数器的Integer对象
       synchronized(application){  //同步处理，保证只有一个进程可访问本方法
       count = (Integer)application.getAttribute("counter");  //获取保存在application对象中的信息
       if(count==null)  //判断该变量是否为空
       count = new Integer(0);
       count = new Integer(count.intValue()+1);  //将变量进行加1处理
       application.setAttribute("counter",count);  //将变量保存在application对象中
       }
     %>
  <font size=6 color="blue">您好！欢迎访问本站，您是第<%=count%>位访客</font>>
</body>
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