MulticastSender.java
import java.io.IOException;
import java.net.DatagramPacket;
import java.net.InetAddress;
import java.net.MulticastSocket;
import java.net.SocketException;
public class MulticastSender {
public static void main(String[] args) {
InetAddress ia = null;
int port = 0;
byte ttl = (byte) 1;
// read the address from the command line
try {
ia = InetAddress.getByName(args[0]);
port = Integer.parseInt(args[1]);
if (args.length > 2)
ttl = (byte) Integer.parseInt(args[2]);
} catch (Exception e) {
System.err.println(e);
System.err.println("Usage: java MulticastSender multicast_address port ttl");
System.exit(1);
}
byte[] data = "Here's some multicast data\r\n".getBytes();
DatagramPacket dp = new DatagramPacket(data, data.length, ia, port);
try {
MulticastSocket ms = new MulticastSocket();
ms.joinGroup(ia);
for (int i = 1; i < 10; i++) {
ms.send(dp, ttl);
}
ms.leaveGroup(ia);
ms.close();
} catch (SocketException se) {
System.err.println(se);
} catch (IOException ie) {
System.err.println(ie);
}
}
}
MulticastSniffer.java
import java.net.*;
import java.io.*;
public class MulticastSniffer {
public static void main(String[] args) {
InetAddress group = null;
int port = 0;
// read the address from the command line
try {
group = InetAddress.getByName(args[0]);
port = Integer.parseInt(args[1]);
} // end try
catch (Exception e) {
// ArrayIndexOutOfBoundsException, NumberFormatException,
// or UnknownHostException
System.err.println("Usage: java MulticastSniffer multicast_address port");
System.exit(1);
}
MulticastSocket ms = null;
try {
ms = new MulticastSocket(port);
ms.joinGroup(group);
byte[] buffer = new byte[8192];
while (true) {
DatagramPacket dp = new DatagramPacket(buffer, buffer.length);
ms.receive(dp);
String s = new String(dp.getData());
System.out.println(s);
}
} catch (IOException e) {
System.err.println(e);
} finally {
if (ms != null) {
try {
ms.leaveGroup(group);
ms.close();
} catch (IOException e) {
}
}
}
}
}
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