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Java Bean实现网页来访计数器

2009-10-10 16:41 316 查看

1.JSP页：

<%--

Document : index

Created on : 2009-10-10, 14:47:46

Author : lucifer

--%>

<%@page contentType="text/html" pageEncoding="UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"

"http://www.w3.org/TR/html4/loose.dtd">

<jsp:useBean id="count" class="MyBean.Counter"/>

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>JSP Page</title>

</head>

<body bgcolor="#FFFFCC">

<center>

<font size="+5" face="楷体">Welcome!!</font><br>

You're the

<%

String url = "C://Users//lucifer//Desktop//count.txt";
//改成自己的text文件，用来计数

count.setPath(url);

count.setCount();

out.println(count.getCount());

%>

Visitor!!!

</center>

</body>

</html>

2.Bean:

package MyBean;

import java.io.*;

/**

*

* @author lucifer

*/

public class Counter {

private String url;

private String count;

public void setPath(String url){

this.url = url;

}

public String getCount(){

try{

BufferedReader br;

br = new BufferedReader(new FileReader(url));

count = br.readLine();

br.close();

return count;

}

catch(IOException e){

e.printStackTrace();

return "No Record!";

}

}

public void setCount(){

try{

BufferedReader br = new BufferedReader(new FileReader(url));

count = new String(br.readLine());

int num;

if(count == null)

num = 1;

else

num = Integer.parseInt(count) + 1;

try{

PrintWriter pw = new PrintWriter(new FileOutputStream(url));

pw.println(num);

pw.close();

}

catch(IOException e){

System.out.println(e.getMessage());

}

br.close();

}

catch(IOException e){

e.printStackTrace();

}

}

}

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