傳送

　　private DatagramSocket sendSocket = null;
    
　　private int sendPort = 8856;

　　private String ip = "192.168.1.100";

   private void sendMsg(final String msg) {
        new Thread(new Runnable() {
            @Override
            public void run() {
                try {
                    if (sendSocket == null) {
                        sendSocket = new DatagramSocket(sendPort);
                    }
                    InetAddress inetAddress = InetAddress.getByName(ip);
                    DatagramPacket datagramPacket = new DatagramPacket(msg.getBytes(), msg.length(), inetAddress, receivePort);
                    sendSocket.send(datagramPacket);
                } catch (Exception e) {
                }
            }
        }).start();
    }



接收

private DatagramSocket receiveSocket = null;

private int receivePort = 8855;

DatagramPacket datagramPacket;

private void receiveMsg() {
    try {
        if (receiveSocket == null) {
            receiveSocket = new DatagramSocket(receivePort);
        }
        while (true) {
            byte[] bytes = new byte[1024];
            datagramPacket= new DatagramPacket(bytes, 0, bytes.length);
            receiveSocket.receive(datagramPacket);
            String data = new String(datagramPacket.getData(), 0, datagramPacket.getLength());
        }
    } catch (Exception e) {
    }
}