SocketServer based zip server

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipOutputStream;
import java.net.Socket;
 //ja  va  2  s . c o  m
class ZipSocket extends Socket {

    private InputStream in;
    private OutputStream out;

    public ZipSocket() { super(); }

    public ZipSocket(String host, int port) 
        throws IOException {
        super(host, port);
    }

    public InputStream getInputStream() 
        throws IOException {
        if (in == null) {
            in = new ZipInputStream(super.getInputStream());
        }
        return in;
    }

    public OutputStream getOutputStream() 
        throws IOException {
        if (out == null) {
            out = new ZipOutputStream(super.getOutputStream());
        }
        return out;
    }

   
    public synchronized void close() throws IOException {
        OutputStream o = getOutputStream();
        o.flush();
        super.close();
    }

}

import java.net.ServerSocket;
import java.net.Socket;
import java.io.IOException;
/*  ja v  a2 s.  c  o  m*/
public class ZipServerSocket extends ServerSocket
{
  public ZipServerSocket(int port) throws IOException
  { 
  super(port);
  }

  public Socket accept() throws IOException
  { 
     Socket socket = new ZipSocket();
     implAccept(socket);
     return socket;
  }
}