Using timer in a server thread

Hi,
I just build a server, I want to add timer to thread where user don't
send any message for 5 minuts the thread is close: what I need to do?

import java.net.*;
import java.io.*;

public class *** extends Thread {
    private Socket socket = null;

    public ***(Socket socket) {
    super("***");
    this.socket = socket;
}

    public void run() {

    try {
        PrintWriter out = new PrintWriter(socket.getOutputStream(),
true);
        BufferedReader in = new BufferedReader(
                    new InputStreamReader(
                    socket.getInputStream()));

        String inputLine, outputLine;
        *** sftp = new ***(socket);
        outputLine = sftp.processCommand(null);
        out.println(outputLine);

        while ((inputLine = in.readLine()) != null) {
        outputLine = sftp.processCommand(inputLine);

          out.println(outputLine);
        if (outputLine.equals("100 Bye.\r\n"))
            break;
        }
        out.close();
        in.close();
        socket.close();

    } catch (IOException e) {
        e.printStackTrace();
    }
    }
}
Thanks!