(基础)计算访问次数..

来源：互联网发布：淘宝视觉编辑：程序博客网时间：2024/04/30 19:27

<%@ page contentType="text/html;charset=gb2312" %>
<%@ page import="java.io.*" %>
<html>
<body>
<%!
int number=0;
File file=new File("count.txt");
synchronized void countPeople()//计算访问次数的同步方法
{
     if(!file.exists())
      {
       number++;
       try{
             file.createNewFile();
             FileOutputStream out=new

FileOutputStream("count.txt");
DataOutputStream dataOut=new

DataOutputStream(out);
             dataOut.writeInt(number);
             out.close();
             dataOut.close();
          }
       catch(IOException ee){}
      }
       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 ee){}
      }
   }%>
<% countPeople(); %>
<p><p>你是第<%= number %>个访问本站的客户
</body>
</html>