multicastSocket实现单播组播 局域网通信

@Event(value = R.id.test2)private void test2(View w) {    new Thread(new Runnable() {        @Override        public void run() {            service();        }    }).start();}@Event(value = R.id.test3)private void test3(View w) {    new Thread(new Runnable() {        @Override        public void run() {            getReceiver();        }    }).start();}@Event(value = R.id.test4)private void test4(View w) {    new Thread(new Runnable() {        @Override        public void run() {            registSocket();        }    }).start();}public void getReceiver() {    if (!multicastSocket.isClosed() && null != multicastSocket) {        try {            String time = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()) + "test444";            byte[] buf2 = time.getBytes();            //192.168.1.101s            InetAddress byName = null;            byName = InetAddress.getByName("192.168.1.126");            DatagramPacket datagramPacket = new DatagramPacket(buf2, buf2.length, byName, 10000);            System.out.println("数据发送。。datagramPacket。");            multicastSocket.send(datagramPacket);            Thread.sleep(1000);        } catch (Exception e) {            e.printStackTrace();        }    }}MulticastSocket multicastSocket;public void registSocket() {    if (ip != null) {        System.out.println("ip:" + ip);        try {            if (!multicastSocket.isClosed() && null != multicastSocket) {                String time = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()) + "test333";                byte[] buf2 = time.getBytes();                //192.168.1.101s                InetAddress byName = InetAddress.getByName(ip.getHostAddress().toString());                DatagramPacket datagramPacket = new DatagramPacket(buf2, buf2.length, byName, 10000);                System.out.println("数据发送。。datagramPacket。");                multicastSocket.send(datagramPacket);                Thread.sleep(1000);            }        } catch (Exception e) {            e.printStackTrace();        }    }}public void service() {    // TODO Auto-generated method stub    try {        multicastSocket = new MulticastSocket(10000);        InetAddress address = InetAddress.getByName("239.0.0.1");        multicastSocket.joinGroup(address);        byte[] buf = new byte[1024];        while (true) {            DatagramPacket datagramPacket = new DatagramPacket(buf, buf.length);            multicastSocket.receive(datagramPacket); // 接收数据，同样会进入阻塞状态            byte[] message = new byte[datagramPacket.getLength()]; // 从buffer中截取收到的数据            System.arraycopy(buf, 0, message, 0, datagramPacket.getLength());            ip = datagramPacket.getAddress();            System.out.println(ip);            System.out.println(new String(message));        }    } catch (IOException e) {        // TODO Auto-generated catch block        e.printStackTrace();    } // 接收数据时需要指定监听的端口号}@Event(value = R.id.test1)private void test(View w) {    new Thread(new Runnable() {        @Override        public void run() {            sent();        }    }).start();}public void sent() {    MulticastSocket multicastSocket;    try {        multicastSocket = new MulticastSocket();        InetAddress address = InetAddress.getByName("239.0.0.1"); // 必须使用D类地址        multicastSocket.joinGroup(address); // 以D类地址为标识，加入同一个组才能实现广播        multicastSocket.setLoopbackMode(false);        while (true) {//心跳包            String time = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(new Date()) + "test1";            byte[] buf = time.getBytes();            DatagramPacket datagramPacket = new DatagramPacket(buf, buf.length);            datagramPacket.setAddress(address); // 接收地址和group的标识相同            datagramPacket.setPort(10000); // 发送至的端口号            multicastSocket.send(datagramPacket);            Thread.sleep(1000);        }    } catch (Exception e) {        // TODO Auto-generated catch block        e.printStackTrace();    }}