要求：使得接受者可以連續接收發送者傳送的資料
傳送的資料是可變的，如可以從控制檯上輸入；

public void sendSocket() throws IOException {
        DatagramSocket socket = new DatagramSocket(10001);
        while (true) {
            byte[] bs = new byte[1024];
            DatagramPacket pack = new DatagramPacket(bs, bs.length);
            socket.receive(pack);
            InetAddress adress 
 
= pack.getAddress();
            byte[] b = pack.getData();
            int port = pack.getPort();
            System.out.print(adress + "  ");
            System.out.print(port + "  ");
            System.out.println(new String(b, 0, b.length));
        }

 }

//鍵盤接收資料的傳送端
public static void main(String[] args) throws
 
 Exception {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String str = null;
        DatagramSocket socket = new DatagramSocket();
        DatagramPacket pack = null;
        byte[] bs = null;
        while ((str = br.readLine()) != null) {
            if
 
 (str.equals("finish"))
                break;
            bs = str.getBytes();
            pack = new DatagramPacket(bs, bs.length, InetAddress.getByName("127.0.0.1"), 10001);
            socket.send(pack);
        }
        socket.close();
    }