Java 接收UDP多播消息的UDP多播套接字

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import java.net.DatagramPacket;

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import java.net.InetAddress;

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import java.net.MulticastSocket;

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public class Main {

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  public static void main(String[] args) throws Exception {

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    InetAddress mcIPAddress = InetAddress.getByName("127.0.0.1");

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    MulticastSocket mcSocket = new MulticastSocket(5555);

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    System.out.println("Multicast Receiver running at:"

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        + mcSocket.getLocalSocketAddress());

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    mcSocket.joinGroup(mcIPAddress);

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    DatagramPacket packet = new DatagramPacket(new byte[1024], 1024);

    /**

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    while (true) {

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      System.out.println("Waiting for a multicast message...");

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      mcSocket.receive(packet);

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      String msg = new String(packet.getData(), packet.getOffset(),

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          packet.getLength());

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