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844天前<%@ page contentType="text/html;charset=gb2312" %> |
<%@ page import="java.io.*" %> |
<!--jsp计数器--> |
<html> |
<head> |
<title>jsp计数器</title> |
</head> |
<body> |
<% |
|
BufferedReader file; //BufferedReader对象，用于读取文件数据 |
String nameOfTextFile =request.getRealPath("/") + "\\counter.txt"; |
//读取 |
file = new BufferedReader(new FileReader(nameOfTextFile)); |
String readStr =null; |
int writeStr =0; //如果计数文本中的计数值为空则让它显示时变成1并写入 |
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"; |
//判断cookie,第一次登陆时加1,刷新时不累计计数 |
else if (request.getHeader("Cookie")==null) |
{ writeStr = Integer.parseInt(readStr)+1;} |
else |
{ writeStr = Integer.parseInt(readStr);} |
//写入时控制因为刷新引起的重复计数 |
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> |
