XModem sending part

I am stuck in my project at XModem communication in java.I only need sending part if any body can help me please my due date is coming.

And this is related to Swing how?
Moving to Sockets and Internet Protocols.

I developed my project in Swing for serial communication.

But the problem isn't related to the Swing part.

Sorry dear I can't understand what you said would you like to explain me again what you said.My problem is that I want Xmodem in java and only for sending file.

I never even addressed your problem. All I said was that your problem is not related to the user interface of your application, and that's why I moved your thread to a different forum.

XModem is a protocol generally used over serial connections, so I doubt that sockets or TCP/IP communication would be involved. This post mentions a commercial implementation and the beginnings of an open source implementation: http://stackoverflow.com/questions/606074/implementation-of-x-modem-protocol-in-java