Java web网站访问量的计数_实现一个网页访问计数功能,每一个用户登录到本网站,就将网页的计数器加1。注意:同-优快云博客

本文链接：https://blog.youkuaiyun.com/Allureyou/article/details/54564303

当客户访问网站时就去读这个文件，将服务器重新启动前的计数读入，并在此基础上增加1，然后将新的计数写入到文件中。

参考代码如下：

<%@ page language="java" import="java.io.*" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
	<%!
		int number = 0;
		File file = new File("count.txt");
		synchronized void countPeople()
		{
			if(!file.exists())
			{
				number++;
				try{
					file.createNewFile();
					FileOutputStream out = new FileOutputStream("count.txt");
					DataOutputStream dataOut = new DataOutputStream(out);
					dataOut.writeInt(number);
					dataOut.close();
				}catch(IOException ex){}
			}
			else 
				try{
					FileInputStream in = new FileInputStream("count.txt");
					DataInputStream dataIn = new DataInputStream(in);
					number = dataIn.readInt();
					number++;
					in.close();
					dataIn.close();
					FileOutputStream out = new FileOutputStream("count.txt");
					DataOutputStream dataOut = new DataOutputStream(out);
					dataOut.writeInt(number);
					out.close();
					dataOut.close();
				}catch(IOException ex){}
		}
	%>
	<%
		countPeople();
	%>
	<p>
		您是第
		<%=number %>
		个访问网站的客户。
	</p>
</body>
</html>