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client / server (communication problem...)

mark smith
Ranch Hand

Joined: Apr 05, 2005
Posts: 251

i need to create a little client/server (multithread)

i read

i don't need the protocol class (just need to return what the client type and the number of request...)

the connection is ok but when the client type... nothing happen on the server

client class

server class

ServerThread class

PrintWriter and BufferedReader seem ok...
any idea?
Ranch Hand

Joined: Nov 22, 2008
Posts: 18944
hi marc,

the server code is fine - you may test it by connecting to your server with a telnet client and then typing a line.

however, the client expects the server to send a welcome string once they are connected. it hangs at:

because the server also waits for the client to send something, which doesn't happen!
mark smith
Ranch Hand

Joined: Apr 05, 2005
Posts: 251
ok but how can i resolve the problem
Ranch Hand

Joined: Nov 22, 2008
Posts: 18944
check this out.
like this, there is no loop or so, but you can see what you type in at the client will be received by the server. Now just do whatever you wanted to do with the data coming in at the server.
One caveat. When you run the client from an IDE, you might get problems because sometimes, STDIN ( is not readable (BufferedReader.readLine() in the client then returns immediately). I have this problem when I use my Netbeans IDE. Netbeans uses Ant for running a project, and by default you don't have a console (there is some kind of switch you can set in the "java" ant task, it's attribute "fork" which you probably have to set to "true" if you wanna use the Netbeans console as STDIN; see manual: I recommend testing from the command line.

[ September 28, 2005: Message edited by: Dennis K�hn ]
sama xxx

Joined: Nov 21, 2005
Posts: 1
I have done this and am facing the same problem "client don't get the result from the server".....need help

Client code:

Multi-Server code:

Thread code:

i have changed things according to the previous explenation but still
Ernest Friedman-Hill
author and iconoclast

Joined: Jul 08, 2003
Posts: 24199

Colinm and sama xxx

Both of you, welcome to JavaRanch!

And I do have to let you know that you're both in violation of the JavaRanch policy on display names. It requires that you use a full, real (sounding) first and last name for your display name. Joke names and "handles" aren't acceptable at the Ranch. You can change your display names here; please do so right away. Thanks for your cooperation.

[Jess in Action][AskingGoodQuestions]
sama Ali

Joined: Nov 22, 2005
Posts: 4
LOL no one seems to offer help in here
I agree. Here's the link:
subject: client / server (communication problem...)
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