<%@ page contentType="text ml;charset=gb2312"%>
<%@ page language="java" import="java.io.*"%>
<html>
<head>
<meta http-equiv="content-type" content="text ml; charset=gb2312">
<title>計數(shù)器</title>
</head>
<%!
//同步更新計數(shù)器
synchronized void counter(){
ServletContext application=getServletContext(); //構(gòu)造application對象（可選）
String szpath=application.getRealPath("/"); //得到當前路徑
szpath=szpath+"hits.txt"; //計數(shù)器文檔 0-9999999999999...
String szrecord=""; //記數(shù) string
int nrecord=0; //記數(shù) int
try{
BufferedReader file=new BufferedReader(new FileReader(szpath));
szrecord=file.readLine(); //讀取計數(shù)器文檔
}
catch(IOException e){
e.printStackTrace(System.err);
}
if(szrecord==null) szrecord="0"; //假如計數(shù)器文檔為空
nrecord=java.lang.Integer.parseInt(szrecord)+1; //計數(shù)器+1
try{
File f=new File(szpath);
PrintWriter pw=new PrintWriter(new FileWriter(f));
pw.print(nrecord); //寫文檔
pw.close();
}
catch(IOException e){
System.out.println(e);
}
}
%>
<%
//顯示計數(shù)器
if(session.isNew()){ //假如是新用戶
counter();
}
String path=application.getRealPath("/");
String szpath=path+"hits.txt";
String szrecord="";
BufferedReader file=new BufferedReader(new FileReader(szpath));
try{
szrecord=file.readLine();
}
catch(IOException e){
System.out.println("文檔未找到！");
}
//顯示7位數(shù)字gif圖像
String szout="<body topmargin=0 leftmargin=0>";
int i=0;
int k=7-szrecord.length(); //"0"的個數(shù)
for (i=0;i<k-1;i++){ //顯示"0"
szout=szout+"<img src=images/0.gif>";
}
for (i=0;i<szrecord.length();i++){ //顯示非"0"
szout=szout+"<img src=images/"+ szrecord.charAt(i) +".gif>";
}