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projects/Assignments/homework2/ConardMulticastSender.java

+
+import java.io.ByteArrayOutputStream;
+import java.io.DataOutputStream;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.InetAddress;
+import java.net.MulticastSocket;
+
+
+/**
+ *
+ * @author emilyconard
+ */
+public class ConardMulticastSender {
+
+    public static final String MULTICAST_ADDRESS = "239.1.2.15";
+    public static final int DESTINATION_PORT = 1717;
+    /** How many routers can be crossed */
+    public static final int TTL = 10; 
+    
+    public static void main(String[] args) 
+    {
+        try
+        {
+            int ID = 27;
+            int xcord = 5;
+            int ycord = 7; 
+            System.setProperty("java.net.preferIPv4Stack", "true");
+            
+            
+            MulticastSocket multicastSocket = new MulticastSocket(1718);
+            multicastSocket.setTimeToLive(TTL);
+            InetAddress multicastAddress = InetAddress.getByName(MULTICAST_ADDRESS);
+            System.out.println(multicastAddress);            
+            // Join group useful on receiving side
+            multicastSocket.joinGroup(multicastAddress);
+            // You can join multiple groups here
+            
+            // Put together a message with binary content. "ByteArrayOutputStream"
+            // is a java.io utility that lets us put together an array of binary
+            // data, which we put into the UDP packet.
+            
+            ByteArrayOutputStream baos = new ByteArrayOutputStream();
+            DataOutputStream dos = new DataOutputStream(baos);
+            dos.writeInt(ID);
+            dos.writeInt(xcord);
+            dos.writeInt(ycord); 
+            byte[] buffer = baos.toByteArray();
+            
+
+            
+            DatagramPacket packet = new DatagramPacket(buffer, buffer.length, multicastAddress, DESTINATION_PORT);
+            
+            for(int idx = 0; idx < 100; idx++)
+            {
+               multicastSocket.send(packet);
+               Thread.sleep(1000); // Send 100, one per second
+               System.out.println("Sent multicast packet " + idx + " of 100");
+            }
+        }
+        catch(Exception e)
+        {
+            System.out.println(e);
+        }
+    }
+  
+}