|
|
<!--jsp計(jì)數(shù)器-->
<%-- 以前學(xué)ASP時(shí),用ASP做防止刷新的計(jì)數(shù)器很簡(jiǎn)單,以下是一個(gè)用JSP做的計(jì)數(shù)器--%>
<html>
<head>
<title>jsp計(jì)數(shù)器</title>
</head>
<body>
<%@ page import="Java.io.*" %>
<%
//out.println(request.getHeader("Cookie"));
String currentRecord = null;//保存文本的變量
BufferedReader file; //BufferedReader對(duì)象，用于讀取文件數(shù)據(jù)
String nameOfTextFile = "count.txt";
//讀取
file = new BufferedReader(new FileReader(nameOfTextFile));
String readStr =null;
int writeStr =0; //如果計(jì)數(shù)文本中的計(jì)數(shù)值為空則讓它顯示時(shí)變成1并寫(xiě)入
try
{ readStr = file.readLine(); }
catch (IOException e)
{ System.out.println("讀取數(shù)據(jù)錯(cuò)誤."); }
if (readStr == null) readStr = "沒(méi)有任何記錄";
//判斷cookie,第一次登陸時(shí)加1,刷新時(shí)不累計(jì)計(jì)數(shù)
else if (request.getHeader("Cookie")==null)
{ writeStr = Integer.parseInt(readStr)+1;}
else
{ writeStr = Integer.parseInt(readStr);}
//寫(xiě)入時(shí)控制因?yàn)樗⑿乱鸬闹貜?fù)計(jì)數(shù)
if (request.getHeader("Cookie")==null)
{
try {
PrintWriter pw = new PrintWriter(new FileOutputStream(nameOfTextFile));
pw.println(writeStr);
pw.close();}
catch(IOException e) {
out.println(e.getMessage());}
}
%>
<p align="center">您是CNJSP的第<b><font color="red"><%=writeStr%></font></b>位客人。</p>
</body>
</html>
jsp技術(shù)：一個(gè)可以防止刷新的JSP計(jì)數(shù)器，轉(zhuǎn)載需保留來(lái)源！
鄭重聲明：本文版權(quán)歸原作者所有，轉(zhuǎn)載文章僅為傳播更多信息之目的，如作者信息標(biāo)記有誤，請(qǐng)第一時(shí)間聯(lián)系我們修改或刪除，多謝。
