On-line Communication Client

Main focus of this thesis is protocol XMPP (Extensible Messaging and Presence Protocol) and its implementation into on-line client built in JAVA programming language. Purpose of XMPP protocol is to deliver messages in real-time between two or more users. It’s standardized protocol with open specification based on XML (Extensible Markup Language). This thesis describes various aspects and specifications of XMPP protocol, the way the messages are exchanged between users, various types of XML information contained in stream which is exchanged between entities in network and generally describes functioning of XMPP protocol. The output of this thesis is an on-line client for instant messaging developed using Smack API package for JAVA – various aspects of this package are described in this document alongside explanation of implementation of the client