1、 i 摘摘 要要 随着互联网的发展， 网络聊天工具作为一种交流工具， 已经受到网民的青睐。 目前， 出现了很多功能强大的聊天工具， 其中应用比较广泛的有腾讯 QQ、 MSN-Messager 等等。 即时通讯软件，是每一个上网用户都需要的工具，它除了能够让您迅速地在网上找 到自己的朋友和伙伴之外，还可以实时交谈和传递信息，截止到目前，全球约有近 3 亿 多人使用即时软件，正因为即时通讯软件拥有数以亿计的用户和增长的市场，所以各个 公司都盯上了这个最大的市场，一时间，即时通讯市场硝烟四起。 对等网络(peer-to-peer，简称 P2P)，应用最初出现时和现在并不相同。事实上可以 认为它是若干
2、不同技术以及流行趋势相结合的产物。 以下是导致 P2P 技术发展最重要的 趋势:首先，一些新技术与软件工程的结合，形成了一种将工作分散的趋势。P2P 计算正 是这种分散工作趋势的结果。其次，在企业应用集成等因素的驱动下，过去十年渐渐形 成从集中的单机系统转向分布式系统。然而随着互联网的发展，全面的分布式计算也就 成为一种迫切需求。 关键词：局域网 聊天 P2P java ii Abstract With the development of the Internet，the chat tool as a communication tool, has been popularly accept
3、ed by netizens of all ages. At present, there are many powerful chat tools, of which Tencent QQ, MSN-Messager are much more prevalent. Instant messaging software is necessary for every one who connects to the internet, which can not only provide you a prompt way to find friends and partners online,
4、but can provide you the convenience of internet relay chat and information delivering. Up to now, there are about 300 million people using real-time software all over the world. As more and more corporations have focused on this market with growing potential, which has hundreds of millions of uses,
5、the competitions among these corporations are extremely fierce. The initial application of peer-to-peer network (peer-to-peer, referred to as P2P) is not the same as it is now. In fact, it can be regarded as a combination of different technologies and fashion trends. Below are the most important tre
6、nds that have led the development of P2P technology: First of all, the integration of software engineering and new technologies led to a working dispersion trend. As a result, P2P computing was born. Then, in the past decade, it has turned fro m a single centralized system to distributed system due to the motivation of factors such as enterprise application integration. At last, with the development of the Internet, however, a comprehensive
