This document summarizes a Java chat application that uses a client-server architecture. It allows clients to communicate with each other through a server. The chat application is lightweight and easy to use. It uses networking, multi-threading, applets, and AWT. The application protocol involves clients sending messages to the server via DataOutputStream, the server broadcasting messages to all clients via DataOutputStream, and clients receiving messages from the server via DataInputStream. Potential future improvements include multiple chat rooms, skins, language support, and stronger security.

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 !