摘 要随 着 网 络 通 信 技 术 和 计 算 机 技 术 的 进 一 步 进 展 , 即 时 通 信 (Instant Messaging)正在成为网络在线活动中不可缺少的业务,对它的讨论是互联网应用中一个热点课题。即时通信软件的诞生,推动了企业工作效率的提高,降低了办公费用,给企业的管理带来了新的思路和方法,并引起了人们对该应用领域的关注。本文在现有的网络通信技术、数据库技术和信息安全技术的基础上设计并实现了新型的企业即时通信系统(EIM,Enterprise Instant Messaging)。该系统为用户提供了一个集文字通信、文件传输于一体的即时通信平台,基本满足了企业用户的要求。在对即时通信系统的服务器端和客户端的主要组成模块详细剖析后,论文讨论了各个模块的详细设计和实现方式,分别讨论了每个模块的主要功能,并给出了模块运行效果图。系统实现后,对系统进行了功能测试,并分析测试数据。实验数据表明,该系统具有易于实现、可靠性高、易于扩展、传输效率高等特点,达到了预定的设计目标。关键词:即时通信,Socket,通信模型, 文件传输AbstractWith the network communication technology and the further development of computer technology, instant messaging (Instant Messaging) is becoming an indispensable network of online business activities; its research is a hot topic in Internet applications. The birth of instant messaging software, to promote the work efficiency of the enterprise, reducing business costs, to the enterprise's management has brought new ideas and methods, and aroused the concern of the applications. The subject in the existing network communication technology, database technology and information security technology based on the design and implementation of a new type of enterprise instant messaging system (EIM, Enterprise Instant Messaging). The system provides users with a set of text communication file transfer, instant messaging platforms in one, basically meet the requirements of business users.Then, the paper of the instant messaging system server and client modul...