📄 example3_19.jsp.bak
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<HTML>
<%@page contentType="text/html;charset=GB2312"%>
<%@page import="java.io.*"%>
<BODY bgcolor=cyan><Font size=3>
<%! int number=0;
synchronized void countPeople()
{
if(number==0)
{
try
{
File f=new File("D:/Tomcat","countPeople.txt");
FileInputStream in=new FileInputStream(f);
DataInputStream dataIn=new DataInputStream(in);
number=dataIn.readInt();
number++;
in.close();
dataIn.close();
}catch(FileNotFoundException e)
{
number++;
try
{
File f=new File("D:/Tomcat","countPeople.txt");
FileOutputStream out=new FileOutputStream(f);
DataOutputStream dataOut=new DataOutputStream(out);
dataOut.writeInt(number);
out.close(); dataOut.close();
}
catch(IOException ee){}
}
catch(IOException ee){}
}
else
{
number++;
try
{
File f=new File("D:/Tomcat","countPeople.txt");
FileOutputStream out=new FileOutputStream(f);
DataOutputStream dataOut=new DataOutputStream(out);
dataOut.writeInt(number);
out.close(); dataOut.close();
}
catch(FileNotFoundException e){}
catch(IOException e){}
}
}
%>
<% if(session.isNew())
{
countPeople();
String str=String.valueOf(number);
session.setAttribute("count",str);
}
%>
<%-- String a=(String)session.getAttribute("count");
if(a==null)a="1";
int num=Integer.parseInt(a);
--%>
<P>您是第<%=(String)session.getAttribute("count")%>个访问本站的人
</FONT>
</BODY>
</HTML>
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