??? 本實(shí)例實(shí)現(xiàn)一個(gè)簡(jiǎn)單的網(wǎng)站計(jì)數(shù)器
???
[編程要點(diǎn)]???
這里主要用到了Java2的同步處理機(jī)制,每個(gè)Java application 都有basic.counter的屬性,當(dāng)application被調(diào)用一次就把basic.counter值加1.
??
?[程序?qū)崿F(xiàn)]
<%@ page contentType="text/html; charset=gb2312" %>
<%@ page language="java" %>
<%
? Integer count = null;
? //同步處理
? synchronized (application)
? {
??? //從內(nèi)存當(dāng)中讀取訪問(wèn)量
??? count = (Integer) application.getAttribute("basic.counter");
??? if (count == null)
??? count = new Integer(0);
??? count = new Integer(count.intValue() + 1);
??? //將訪問(wèn)量保存到內(nèi)存當(dāng)中
??? application.setAttribute("basic.counter", count);
? }
%>?
<html>
<head>
<title>簡(jiǎn)單計(jì)數(shù)器</title>
</head>
<body>
<center>
<font size=10 color=blue>簡(jiǎn)單計(jì)數(shù)器</font>
<br>
<hr>
<br>
<font size=5 color=blue>您好！您是本站的第 <%= count %> 位客人</font>
</center>
</body>
</html>
[運(yùn)行結(jié)果]
posted on 2006-08-21 12:16
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