jsp—application 模擬計數器，jspapplication
1 <%@ page language="java" contentType="text/html; charset=UTF-8"
2 pageEncoding="UTF-8"%>
3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
4 <html>
5 <head>
6 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
7 <title>Insert title here</title>
8 </head>
9 <body>
10 <%
11
12 String str=application.getInitParameter("test2");
13 out.print("test2="+str+"<br>");
14 //模擬計數器
15 //初始化
16 //取出計數器的當前值
17 Object obj=application.getAttribute("count");
18 if(obj==null)
19 {
20
21 application.setAttribute("count", 1);
22 obj=1;
23 }
24
25 //模擬計數器++（+1）的運行方式
26 //數據轉型，同object轉成數值型
27 long count=Long.parseLong(obj.toString());
28 count++;
29 //out.print("count="+obj.toString());
30 out.print("count="+count);
31 //取完之後將新的值在放到裡面繼續疊加運算
32 application.setAttribute("count", count);
33 %>
34 </body>
35 </html>
