Internet was born in the traditional telephone network while communication exchange can be said of the Internet natural one. Internet is now the world's largest computer Internet, it spread globally, of all sizes around the world connects to the network as a whole. With the network communication technology and the further development of computer technology, instant communication network online activities are becoming indispensable to business. In recent years, computer technology is developing rapidly, in particular the development of computer networks, increasingly profound changes in all aspects of people's lives.
Socket is the Programming Interface of TCP/ IP , namely using a set of API , offered by Socket , programming to realize TCP/ IP. This paper takes use of the class and interface of Java.net packets and Java. awt packet, using JDK6.0. developed instant communications software "LanMessage." The software include client, the client has a general communications software functions, including: point-to-point text chat function, file transfer function,Mass function, After testing the basic system design to achieve the desired objectives.
Keywords: Java, Lan, Instant communication, TCP / IP
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