📄 ex2_5.jsp
字号:
<%@ page contentType="text/html;charset=GB2312" %>
<%@ page import="java.io.*" %>
<HTML>
<BODY BGCOLOR=cyan><FONT Size=1>
<%! int number=0;
synchronized void countPeople()//计算访问次数的同步方法
{
if(number==0)
{
try{
FileInputStream in=new FileInputStream("count.txt");
DataInputStream dataIn=new DataInputStream(in);
number=dataIn.readInt();
number++;
in.close();
dataIn.close();
}
catch(FileNotFoundException e)
{ number++;
try {FileOutputStream out=new FileOutputStream("count.txt");
DataOutputStream dataOut=new DataOutputStream(out);
dataOut.writeInt(number);
out.close();dataOut.close();
}
catch(IOException ee){}
}
catch(IOException ee)
{
}
}
else
{number++;
try{
FileOutputStream out=new FileOutputStream("count.txt");
DataOutputStream dataOut=new DataOutputStream(out);
dataOut.writeInt(number);
out.close();dataOut.close();
}
catch(FileNotFoundException e){}
catch(IOException e){}
}
}
%>
<%
countPeople();
%>
<P><P>您是第
<%=number%>
个访问本站的客户。
<BODY>
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