created cs654/lab5/partII directory

git-svn-id: svn://anubis/gvsu@16 45c1a28c-8058-47b2-ae61-ca45b979098e

cs654/lab5/partII/ChatClient.java

@@ -0,0 +1,67 @@
+import java.net.*;
+import java.io.*;
+
+public class ChatClient {
+	
+   ChatFrame gui;
+   String name;
+  
+   InetAddress group;
+   MulticastSocket socket;
+   int port = 6789;
+  
+   public ChatClient(String name) {
+      this.name = name;
+
+      // GUI Create GUI and handle events:
+      // After text input, sendTextToChat() is called,
+      // When closing the window, disconnect() is called. 
+
+      gui = new ChatFrame("Chat with IP-Multicast");
+      gui.input.addKeyListener (new EnterListener(this,gui));
+      gui.addWindowListener(new ExitListener(this));
+     
+// In order for a host to receive a multicast data, 
+// the receiver must register with a group, by creating a MulticastSocket on a port and call the joinGroup() method.
+
+      try {
+         socket = new MulticastSocket(port);
+         group = InetAddress.getByName("226.1.3.5");
+         socket.joinGroup(group);
+         gui.output.append("Connected...\n");
+
+ // waiting for and receiving messages 
+
+         while (true) {
+	    byte[] buffer = new byte[1000];
+?
+?
+	    String message = new String(datagram.getData());
+	    gui.output.append(message);
+         }
+      } catch (IOException e) { 
+         e.printStackTrace(); 
+      }
+   }
+  
+   public void sendTextToChat(String message) {
+      message = name+": "+message+"\n";
+      byte[] buf = (message).getBytes();
+      ?
+      try { 
+         ?
+      }
+      catch (IOException ex) { 
+         System.out.println(ex);
+      }
+   }
+
+   public void disconnect() {}
+
+   public static void main(String args[]) {
+      if (args.length!=1) 
+         throw new RuntimeException ("Syntax: java ChatClient <name>"); 
+      ChatClient client = new ChatClient(args[0]);
+   }
+}
+