不同机器上的简单UDP广播客户端和服务器

The idea behind this test is so I can use this method so a client can find a server on the LAN by sending a datagram packet (peer discovery). I think I'm doing something wrong with the host name or something but after a week of googling and testing new ideas I'm officially all out of them :(.

public class Client
{
    private String hostname= "localhost";
    private int port=1234;
    private InetAddress host;
    private DatagramSocket socket;
    DatagramPacket packet;

    public void run()
    {
        try
        {
            host = InetAddress.getByName(hostname);
            socket = new DatagramSocket (null);
            packet=new DatagramPacket (new byte[100], 0,host, port);
            socket.send (packet);
            packet.setLength(100);
            socket.receive (packet);
            socket.close ();
            byte[] data = packet.getData ();
            String time=new String(data);  // convert byte array data into string
            System.out.println(time);
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
    }
}



public class Server
{
    public static final int DEFAULT_PORT = 1234;
    private DatagramSocket socket;
    private DatagramPacket packet;

    public void run()
    {
        try
        {
            socket = new DatagramSocket(DEFAULT_PORT);
        }
        catch( Exception ex )
        {
            System.out.println("Problem creating socket on port: " + DEFAULT_PORT );
        }

        packet = new DatagramPacket (new byte[1], 1);

        while (true)
        {
            try
            {
                socket.receive (packet);
                System.out.println("Received from: " + packet.getAddress () + ":" +
                                   packet.getPort ());
                byte[] outBuffer = new java.util.Date ().toString ().getBytes ();
                packet.setData (outBuffer);
                packet.setLength (outBuffer.length);
                socket.send (packet);
            }
            catch (IOException ie)
            {
                ie.printStackTrace();
            }
        }
    }
}

只是想知道是否有人可以提供帮助?