initial multicastsocket example

VerteilteSysteme-Examples/src/verteiltesysteme/socket/multicast/UDPMulticastConsumer.java

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+/* Angelehnt an Kurose/Ross Computernetzwerke (bis 5e Java, ab 6e Python) */
+
+package verteiltesysteme.socket.multicast;
+
+import java.net.*;
+
+class UDPMulticastConsumer {
+	public static void main(String args[]) throws Exception {
+		String groupname = "224.1.1.1";
+		int udpPort = 36040;
+		@SuppressWarnings("resource")
+		MulticastSocket mcastSocket = new MulticastSocket(udpPort);
+		InetAddress IPAddress = InetAddress.getByName(groupname);
+		mcastSocket.joinGroup(IPAddress);
+		
+		byte[] receiveData = new byte[1024];
+
+		while (true) {
+			DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
+			mcastSocket.receive(receivePacket);
+			String sentence = new String(receivePacket.getData(), 0, receivePacket.getLength());
+			System.out.println(sentence);
+		}
+	}
+}

VerteilteSysteme-Examples/src/verteiltesysteme/socket/multicast/UDPMulticastProducer.java

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+/* Angelehnt an Kurose/Ross Computernetzwerke (bis 5e Java, ab 6e Python) */
+
+package verteiltesysteme.socket.multicast;
+
+import java.io.*;
+import java.net.*;
+
+class UDPMulticastProducer {
+	public static void main(String args[]) throws Exception {
+		String groupname = "224.1.1.1";
+		int udpPort = 36040;
+		BufferedReader inFromUser = new BufferedReader(new InputStreamReader(System.in));
+		MulticastSocket mcastSocket = new MulticastSocket(udpPort);
+		InetAddress IPAddress = InetAddress.getByName(groupname);
+		mcastSocket.joinGroup(IPAddress);
+		
+		byte[] sendData = new byte[1024];
+
+		String sentence = inFromUser.readLine();
+		sendData = sentence.getBytes();
+
+		DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, IPAddress, udpPort);
+		mcastSocket.send(sendPacket);
+		mcastSocket.leaveGroup(IPAddress);
+		mcastSocket.close();
+	}
+}