说明：  本次毕业设计的目的在于学习Java程序设计基本技术，学习用Eclipse开发Java程序的相关技术，熟悉项目开发的完整过程。学会怎样进行一个项目的需求分析、概要设计、详细设计等软件开发过程，熟练地掌握Java程序设计的基本技术和方法，熟练地掌握Eclipse环境的使用方法，培养起初步的项目分析能力和程序设计能力。
(Java and Eclipse technology and development at home and abroad the status quo based on the detailed description of the various development stages of the entire life cycle of the LAN real-time communication system. First, the analysis of the feasibility of the development of the system, focusing on analysis of the feasibility of the technology used in the design. Secondly, the aspects of the system main interface, messaging, file transfer, as well as voice, video, JMF multimedia functions)