Java 一个UDP数据报套接字，一个多播发送器应用程序

/* from 

时代Java*/

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import java.net.DatagramPacket;

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import java.net.DatagramSocket;

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import java.net.InetAddress;

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public class Main {

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

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    DatagramSocket udpSocket = null;

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    udpSocket = new DatagramSocket();

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

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    byte[] msg = "Hello multicast socket".getBytes();

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    DatagramPacket packet = new DatagramPacket(msg, msg.length);

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    packet.setAddress(mcIPAddress);

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    packet.setPort(5555);

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    udpSocket.send(packet);

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    System.out.println("Sent a multicast message.");

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