BT下载软件的设计与开发毕业设计论文.docVIP

中文摘要 P2P技术存在已久，其第一次实际使用可以追溯到1979年的Usenet新闻服务系统。随着1998年出现的音乐共享软件Napster的流行，着眼于分布式数据共享的P2P技术得到了迅猛的发展，并日益呈现出取代传统的C/S文件共享模式的趋势。 BitTorrent是P2P技术在文件共享领域最成功的代表之一。BitTorrent是一个开放的文件分发系统，它基于两个通信协议并由几种分工不同的网络节点组成。不同于普通的http或者ftp文件共享方式，BitTorrent采用一种全新的模式：资源的发布者只需要上传一份完整资源的数据量，之后的数据交换完全可以在BitTorrent下载者之间进行。本文将详细分析BitTorrent文件分发系统的关键部分。 本文从P2P的基本概念开始，首先介绍BitTorrent文件分发系统的组成，之后在此基础上解析BitTorrent的两个重要协议，最后重点分析一个轻量型BitTorrent协议客户端的实现。分析依照软件工程的思想，首先描述客户端的总体框架，包括功能模块、数据流和主程序的执行流程。在总体框架的基础上，具体分析客户端的各个功能模块的实现。该BT客户端实现了对种子文件的解析、文件的下载、断点续传等功能，界面使用Qt开发环境进行设计，界面简明、易用，基本可以满足用户文件下载的功能。 关键词：P2P；BitTorrent；文件分发系统；文件分发协议Design and development of the BT client under Linux Author:Zhang Jinlong Tutor:Zhao Hongyan Abstract P2P technology has existed for a long time, its first actual use can be traced back to 1979, the Usenet news service system. Since the music-sharing application Napster designed in 1998 became popular, P2P technology focusing on distributed data-sharing has been in rapid development and with a tendency to replace the traditional C / S file-sharing model gradually. BitTorrent is one of the most successful classifications of P2P technology in file-sharing field. It is an open file distribution system, which is based on two communication protocol and consists of several network nodes in different roles. Unlike ordinary http or ftp file-sharing manner, BitTorrent uses a new model: the publisher of a resource only needs to upload at least a whole resource. After that, the exchange of data can be just done between the BitTorrent downloaders. This article will detailedly analysethe implementation of the pivotal part of BitTorrent file distribution system, a BitTorrent client. This article will begin with the P2P basic concept, and then introduce the constitutes of the BitTorrent file distribution system. On the basis of that, it willanalyse the two important Algorithms of BitTorrent. And finally it will come with focus on the implementation of a lightweight BitTorrent client. In acc