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Posted 14 Jun 2002


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Java Chat With Customizable GUI

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4.75/5 (105 votes)
7 May 2007CPOL3 min read
A complete Java (AWT) Chat Application with great customizable GUI Interface. It has features such as general chat and private chat, music when message arrives, sending images and more
Sample Image - chat.jpg

Note: The latest source code has been uploaded along with this article now.


This is my second article on The Code Project. I have already posted Tap Control in Java here.

This Java Chat is purely AWT based, no Swing Components used and still it has a great look and feel. For this application, I have developed my own Tab Control and Image Canvas. Also, I have uploaded the complete source code here. You can download it from there.

This is the updated article . Now I have posted all the concepts behind the chat instead
of putting the source code as per the request of The Code Project members.


  1. Transfer Smilies with Text
  2. Private Chat
  3. Great Look and Feel with Customized Color
  4. Audio Enabled


In this Chat application, we have both server side and client side modules.. In server side, I have defined our own RFC Commands. Some of the commands which I have used in this application are listed below:

  • HELO - Initialize connection to server
  • QUIT - Remove users from chat
  • KICK - Kickoff from chat
  • CHRO - Change room
  • MESS - Send general message
  • PRIV - Send private message
  • ROCO - Get users count in specified room
  • CALL - Request for voice chat (not included with this one)

Server Side Module

I will briefly explain the concepts behind the server side.

  • Created custom UserObject class which will have the client details like username, the socket of user, and the room name, etc.
  • When the Chat Server runs, it opens the Server Socket at port 1436 (we can modify too) and listen for the client to connect. If the client connects to the server, it will open a separate thread to service. So, when the client sends QUIT command, it will close the thread too. If you take a look, you will get all the details.

This is a sample code of getting connection from the Chat Client and creating a new object of ChatCommunication. In ChatCommunication class, we will create a thread to watch all the commands from the client and responds to the client too.

    Socket socket = serversocket.accept();
    ChatCommunication chat = new ChatCommunication(socket);

ChatCommuncation(Socket socket)
    personalsocket = socket;
    dout = new Dataoutputstream(personalsocket.getoutoutstream());

Client Side Module

I will also briefly explains the concepts behind the Client side Chat.

  • When the Chat Client runs, it will open a socket and connect to ChatServer by sending HELO RFC to Server.. Once it gets connected, the chat client will keep the socket connection and communicate with the server whenever the user commands it.
  • Another important thing in the client module is the USER INTERFACE. I have created my OWN Custom Components like Tab Control and Image Supported Message Canvas.
  • The basic idea of creating a message canvas is based on simple logic. Whenever users enter the message, I will store it in arraylist. Also, in the Arraylist, I keep the XOffset and YOffSet position of each message. If you have a look of this sample code, you might get an idea of what I mean.
for(int i =0; i < messagearraylist.size();i++)

This is the Function To Paint Images and Text Messages
private void PaintMessageIntoCanvas(MessageObject messageObject)
int m_YPos = messageobject.StartY - YOffset;
int m_XPos = 5 - XOffset;
int CustomWidth = 0;
String Message = messageobject.Message;

/*************Print The User Name in UserName Font **************/        
if(Message.indexOf(":") >= 0)
fontmetrics = chatclient.getGraphics().getFontMetrics();
String m_UserName = Message.substring(0,Message.indexOf(":")+1);
Message = Message.substring(Message.indexOf(":")+1);

/*********Set the Text Font **********/
fontmetrics =  chatclient.getGraphics().getFontMetrics();

/**********Print Image Area********/
if(messageobject.IsImage == true)
tokenizer = new StringTokenizer(Message," ");    
TokenString = tokenizer.nextToken();                
if(TokenString.indexOf("~~") >= 0)
/********If its a Proper Image*************/
try {
int m_ImageIndex = Integer.parseInt(TokenString.substring(2));
if((m_ImageIndex >= 0) && (m_ImageIndex < chatclient.IconCount))
,m_XPos+CustomWidth,m_YPos - 15,messageobject.Width,messageobject.Height,this);
}catch(Exception _Exc) { }                
if(TotalWidth < m_XPos+CustomWidth)
TotalWidth = m_XPos+CustomWidth;


In this updated article, I have uploaded my complete source code. To download the full source code, click here.

If you still have any doubts, feel free to contact me at


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Jeeva S
United States United States
No Biography provided

Comments and Discussions

Generalrequest for the report of the project Pin
Member 1365304018-Nov-18 6:43
MemberMember 1365304018-Nov-18 6:43 
Questionabout Project Pin
Member 1089302216-Jun-17 16:57
MemberMember 1089302216-Jun-17 16:57 
Questionhow to run chat final source code+binaries in netbean Pin
Member 126213326-Jul-16 2:03
MemberMember 126213326-Jul-16 2:03 
QuestionDoesnt work Pin
Reda Benhaddou6-Jun-16 14:03
MemberReda Benhaddou6-Jun-16 14:03 
QuestionError in running code. Need your help Pin
Member 1243826810-Apr-16 7:03
MemberMember 1243826810-Apr-16 7:03 
QuestionHelp Pin
Member 1209449029-Oct-15 6:35
MemberMember 1209449029-Oct-15 6:35 
QuestionError Connect to chat Pin
Gronscij20-Apr-15 21:54
MemberGronscij20-Apr-15 21:54 
Questionregarding gui in netbeans Pin
Member 1149954711-Mar-15 23:17
MemberMember 1149954711-Mar-15 23:17 
AnswerRe: regarding gui in netbeans Pin
Member 1178877330-Sep-15 18:21
MemberMember 1178877330-Sep-15 18:21 
Questionone server to multiple clients Pin
Member 1068127321-Oct-14 20:44
MemberMember 1068127321-Oct-14 20:44 
Questionproblem in adding emoticons Pin
Member 1095065722-Jul-14 21:25
MemberMember 1095065722-Jul-14 21:25 
QuestionJava Chat With Customizable GUI Pin
Member 1081012719-Jul-14 22:18
MemberMember 1081012719-Jul-14 22:18 
Questionlogin values Pin
Member 1063133727-Feb-14 22:56
MemberMember 1063133727-Feb-14 22:56 
Questionsay th'k Pin
Nohara Shinnosuke12-Nov-13 8:28
MemberNohara Shinnosuke12-Nov-13 8:28 
QuestionRooms Pin
Member 1028705320-Sep-13 10:13
MemberMember 1028705320-Sep-13 10:13 
AnswerRe: Rooms Pin
Riko Séfreddy2-May-16 3:05
MemberRiko Séfreddy2-May-16 3:05 
QuestionA link to the correct source code please! Pin
Arash black14-Aug-13 22:46
MemberArash black14-Aug-13 22:46 
GeneralThanks Pin
PhieTheKId31-May-13 19:31
MemberPhieTheKId31-May-13 19:31 
QuestionRegarding proxy server or port Pin
deepali.gudulkar27-May-13 1:59
Memberdeepali.gudulkar27-May-13 1:59 
QuestionHow to use this chat application Pin
Member 1000093620-Apr-13 2:34
MemberMember 1000093620-Apr-13 2:34 
Questionis this messenger even applicable on linux? Pin
ankur0124-Apr-13 19:21
Memberankur0124-Apr-13 19:21 
QuestionU r awesome Pin
Isank Agarwal11-Mar-13 7:36
MemberIsank Agarwal11-Mar-13 7:36 
Questionregarding this chat application Pin
Member 98457264-Mar-13 5:55
MemberMember 98457264-Mar-13 5:55 
AnswerRe: regarding this chat application Pin
Isank Agarwal11-Mar-13 7:38
MemberIsank Agarwal11-Mar-13 7:38 
Questionhow to run the soure code in netbeans Pin
maheshkadtan29-Nov-12 7:15
Membermaheshkadtan29-Nov-12 7:15 

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