Solved

java chat in which server send notification to all clients !!!!

Posted on 2004-05-02
14
381 Views
Last Modified: 2010-03-31
hello to all .,

i am trying to make a console ( gui can be better ) client server chat program ( in java ofcourse !!! ) ...which is multithreaded  ( of course !!! )......
...which goes like this ....

client : LOGIN  shehryar         ( " shehyar" will be extracted using substring )
server : clientname , ip ,  port   ( sends this to all clients connected )
client : LOGOFF
server : clientname LOGOFF   ( sends this to all clients conneted )


i have done a hell lot but cant seem to do it in the order specified.........( i am sure the order is pretty comprehensible ) .......

Explaination : when a client gets connected , it types  LOGIN  clientname ....... "clientname" is extracted using subtring ....then server send    ->    clientname  hisIP  hisPORT    to all clients connected  , and when client A types LOGOFF , the server send notification to all clients that  client A has logged off ...

can plz any1 help in this and send me sum code stuff/part..........thanks !!!
0
Comment
Question by:DahaR
  • 5
  • 5
  • 3
  • +1
14 Comments
 
LVL 92

Expert Comment

by:objects
ID: 10973926
0
 
LVL 30

Expert Comment

by:mayankeagle
ID: 10974657
You should maintain a list of all client-Sockets or their PrintWriters in a static Vector or something like that, at the server-side. When a client connects, then add its PrintWriter to the Vector. When a client disconnects, then remove it. While adding/ removing, iterate through the Vector and send a message to all other clients.
0
 
LVL 1

Author Comment

by:DahaR
ID: 10977552
ok !!! but will        out.println(message);       command     ,  send the message to all clients connected or will i have to use synchronization.... or sumthing  ???
0
 
LVL 30

Expert Comment

by:mayankeagle
ID: 10978054
If you use a Vector, it is synchronized itself, so you don't need to worry about that. You can store all the PrintWriters in that Vector, loop through it and send the data using out.println ( message ). Be careful not to send it to the same client himself~!
0
 
LVL 1

Author Comment

by:DahaR
ID: 10981373
ok ......lemme check  !!!!  by the way ...have u done anything similar to this program !!! that i can get help from or see !!! thx!!!
0
 
LVL 13

Expert Comment

by:Webstorm
ID: 10981751
Hi all,

You can create a class for each client:

    public class ChatClient
    {
          Socket soc;
          String name,ip,port;  // information about the client
          PrintStream ps; // = new PrintStream( soc.getOutputStream() );
    }

>> If you use a Vector, it is synchronized itself
only during the Vector method call.

The client list may need some synchronization :


    public synchronized void addClient( ChatClient cc )
    {
         sendToAllClients("server: "+cc.name+", "+cc.ip+", "+cc.port);
         clients.add(cc);
    }

    public synchronized void removeClient( PrintStream ps )
    {
        clients.remove(cc);
        sendToAllClients("server: "+cc.name+" LOGOFF");
    }

    public synchronized void sendToAllClients( String msg )
    {
         int nb=clients.size();
         for (int i=0;i<nb;i++)
             ((ChatClient)clients.elementAt(i)).ps.println(msg);
    }


0
 
LVL 13

Accepted Solution

by:
Webstorm earned 125 total points
ID: 10981756
   public synchronized void removeClient( PrintStream ps )
Should be:
    public synchronized void removeClient( ChatClient cc )
0
What Should I Do With This Threat Intelligence?

Are you wondering if you actually need threat intelligence? The answer is yes. We explain the basics for creating useful threat intelligence.

 
LVL 1

Author Comment

by:DahaR
ID: 10981878
ok thanks man !!! i'll check it out and then tell ya !!!!!!!
0
 
LVL 1

Author Comment

by:DahaR
ID: 10982818
thanks a lot  WEBSTORM !!!!   yur idea really helped me !!!  

well i have osting another question regarding sending image from server to client using streams......so do check it out....remember my LOGIN plz !!!!!!! see ya ...........
0
 
LVL 30

Expert Comment

by:mayankeagle
ID: 10983527
DahaR. do you know that you can split the points between experts who provide an idea and who provide a working solution?
0
 
LVL 30

Expert Comment

by:mayankeagle
ID: 10983528
>> only during the Vector method call.

Ah, right.
0
 
LVL 1

Author Comment

by:DahaR
ID: 10984558
sorry man , didnt know  that  :( .....will try to be careful next time .....n'ways thx for the info !!!
0
 
LVL 13

Expert Comment

by:Webstorm
ID: 10984814
Hi mayankeagle,

>> do you know that you can split the points ...
You can post a question to
http://www.experts-exchange.com/Community_Support/askQuestion.jsp

Or i can post a question to give you points.
0
 
LVL 30

Expert Comment

by:mayankeagle
ID: 10984964
No, Webstorm, not needed :-) thanks. I just wanted to let DahaR know that it is possible because I had a feeling he didn't know it. I don't have any issues with the PAQing of the question.
0

Featured Post

Enabling OSINT in Activity Based Intelligence

Activity based intelligence (ABI) requires access to all available sources of data. Recorded Future allows analysts to observe structured data on the open, deep, and dark web.

Join & Write a Comment

By the end of 1980s, object oriented programming using languages like C++, Simula69 and ObjectPascal gained momentum. It looked like programmers finally found the perfect language. C++ successfully combined the object oriented principles of Simula w…
Java had always been an easily readable and understandable language.  Some relatively recent changes in the language seem to be changing this pretty fast, and anyone that had not seen any Java code for the last 5 years will possibly have issues unde…
Viewers will learn about if statements in Java and their use The if statement: The condition required to create an if statement: Variations of if statements: An example using if statements:
This tutorial covers a practical example of lazy loading technique and early loading technique in a Singleton Design Pattern.

759 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

21 Experts available now in Live!

Get 1:1 Help Now