A client-server based e-chat application in Java

1. Submitted to Submitted
• Er.:Mayank by :
• Naveen Moorjani (Team
Sharma • Chandni Verma
Leader)
• Tushar Seth
(Coder)
(Tester)

2. Objective
 A JAVA Chat Application based
on client-server architecture.

3. Features
 Allows a client to communicate
with all the other clients connected
to the server.
 Light-weight.
 Easy to operate !
 Can add a chat room to your
website in minutes.

4. Technologies used
 Networking
 Multi-threading
 Applets
 Abstract window toolkit
(AWT)

5. Simplest Concept

6. Protocol – Step 1
 When a user types something into
their chat window, their message
will be sent as a string through a
DataOutputStream.
private void processMessage( String message )
{
try
{
// Send it to the server
dout.writeUTF( message );
// Clear out text input field
tf.setText( "" );
} catch( IOException ie ) {
System.out.println( ie ); }
}

7. Protocol – Step 2
 When the server receives a message,
through a DataInputStream, it will send
this same
message to all users, again as a string
through a DataOutputStream.
void sendToAll( String message ) {
synchronized( outputStreams ) {
for (Enumeration e = getOutputStreams(); e.hasMoreElements(); )
{
DataOutputStream dout = (DataOutputStream)e.nextElement();
try {
dout.writeUTF( message );
} catch( IOException ie ) { System.out.println( ie ); }
}
}
}

8. Protocol – Step 3
 The users will use a DataInputStream to
receive the message.
public void run() {
try {
while (true) {
String message = din.readUTF();
ta.append( message+"n" );
}
} catch( IOException ie ) { System.out.println( ie ); }
}

9. Future prospects
 Multiple chat rooms.
 Multiple skins
 Multi lingual support
 Higher Security Protocols

10. Thanks for watching, Goodbye !