How to create a Quote Server in Java

[Java Tip]

import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.util.Date;

public class QuoteServer {
  public static void main(String[] args) throws IOException {
    new QuoteServerThread().start();
  }
}

class QuoteServerThread extends Thread {
  private DatagramSocket socket = null;

  private DataInputStream in = null;

  private boolean moreQuotes = true;

  public QuoteServerThread() throws IOException {
    super("QuoteServerThread");
    socket = new DatagramSocket(4445);
    try {
      in = new DataInputStream(new FileInputStream("one-liners.txt"));
    } catch (FileNotFoundException e) {
      System.err
          .println("Could not open quote file. Serving time instead.");
    }
  }

  public void run() {

    while (moreQuotes) {
      try {
        byte[] buf = new byte[256];

        // receive request
        DatagramPacket packet = new DatagramPacket(buf, buf.length);
        socket.receive(packet);

        // figure out response
        String dString = null;
        if (in == null)
          dString = new Date().toString();
        else
          dString = getNextQuote();
        dString.getBytes(0, dString.length(), buf, 0);

        // send the response to the client at "address" and "port"
        InetAddress address = packet.getAddress();
        int port = packet.getPort();
        packet = new DatagramPacket(buf, buf.length, address, port);
        socket.send(packet);
      } catch (IOException e) {
        e.printStackTrace();
        moreQuotes = false;
      }
    }
    socket.close();
  }

  private String getNextQuote() {
    String returnValue = null;
    try {
      if ((returnValue = in.readLine()) == null) {
        in.close();
        moreQuotes = false;
        returnValue = "No more quotes. Goodbye.";
      }
    } catch (IOException e) {
      returnValue = "IOException occurred in server.";
    }
    return returnValue;
  }

}

/////////////////////////////////////////////////

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;

public class QuoteClient {
  public static void main(String[] args) throws IOException {

    if (args.length != 1) {
      System.out.println("Usage: java QuoteClient <hostname>");
      return;
    }

    // get a datagram socket
    DatagramSocket socket = new DatagramSocket();

    // send request
    byte[] buf = new byte[256];
    InetAddress address = InetAddress.getByName(args[0]);
    DatagramPacket packet = new DatagramPacket(buf, buf.length, address,
        4445);
    socket.send(packet);

    // get response
    packet = new DatagramPacket(buf, buf.length);
    socket.receive(packet);

    // display response
    String received = new String(packet.getData());
    System.out.println("Quote of the Moment: " + received);

    socket.close();
  }
}