📄 mycounter.jsp
字号:
<html>
<head>
<title>
一个防止刷新的计数器
</title>
</head>
<%@ page contentType="text/html;charset=gb2312"%>
<%@ page import="java.io.*" %>
<body>
<%
BufferedReader file;
String filepath="D:\\count.txt";
file=new BufferedReader(new FileReader(filepath));
String readStr=null;
int writeStr=0;
try
{
readStr=file.readLine();
}
catch(IOException e)
{
System.out.println("读取数据错误.");
}
if(readStr==null)
readStr="没有任何记录.";
else if(request.getHeader("Cookie")==null)
{
writeStr=Integer.parseInt(readStr)+1;
}
else
{
writeStr=Integer.parseInt(readStr);
}
if(request.getHeader("Cookie")==null)
{
try
{
PrintWriter pw=new PrintWriter(new FileOutputStream(filepath));
pw.println(writeStr);
pw.close();
}
catch(IOException e)
{
out.println(e.getMessage());
}
}
%>
<center>
<h2>
您是第<font color="red"><%=writeStr%></font>位客人
</center>
</body>
</html>
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