做一个带有beans的文字计数器
访问计数器程序：counter.Java
package counter;
import java.io.*;
public class counter {
public String path='';
public String doCount() throws FileNotFoundException
{
BufferedReader file;
String countFile=path;
file=new BufferedReader(new FileReader(countFile));
String readStr='';
int writeStr=1;
try
{
readStr=file.readLine();
}
catch(IOException e)
{
System.out.println('读取数据错误.');
}
if(readStr=='') readStr='没有任何记录';
else
{
writeStr=Integer.parseInt(readStr)+1;
}
try
{
PrintWriter pw=new PrintWriter(new FileOutputStream(countFile));
pw.println(writeStr);
pw.close();
}
catch(IOException e)
{
System.out.println(e.getMessage());
}
return readStr;
}
}
counter.JSP代码如下：
<HTML>
<HEAD>
<TITLE>
counter
</TITLE>
</HEAD>
<BODY>
<jsp:useBean id='counter' scope='request' class='counter.counter' />
<%@ page contentType='text/html;charset=gb2312'%>
<%
counter.path='count.txt';
String count=counter.doCount();
%>
<p align='center'>
<H3 align='center'><font color='#993300' size='5'>您好!您是本系统的第
<font color='ff0000'><%=count%> </font>
名访问者！</font></H3>
</body>
</html>
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