学 院：专 业：姓 名：指导老师：
基于socket的网络聊天系统 计算机学院 计算机科学与技术 苏国东 学 号： 100201021010 雷剑刚 职 称： 讲师 中国·珠海 二○一四 年 四 月
北京理工大学珠海学院2014届毕业设计（论文）
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本人郑重承诺：本人承诺呈交的毕业设计《计算机科学与技术》是在指导教师的指导下，独立开展研究取得的成果，文中引用他人的观点和材料，均在文后按顺序列出其参考文献，设计使用的数据真实可靠。
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北京理工大学珠海学院2014届毕业设计（论文）
基于socket的网络聊天系统
摘要 随着科学技术的迅速提高，计算机网络得到了飞速的发展，而各种基于网络的应用
程序也随之诞生，比如基于互联网的信息发布，通信，数据共享等等。局域网技术作为人们日常生活中必不可少的部分同样得到了广泛的应用，人们通过局域网连接INTERNET进行数据传输及交换。因此开发一个局域网的即时通信工具是非常有必要的。本文围绕这个中心并进行了更为合理的设计在WINDOWS平台上进行了实现。将客户端与服务器端分开，用多线程实现不同的并行任务。能够满足一般用户最基本的要求，特点是简单方便，功能齐全，拓展性强。
关键词：局域网; 即时通信; 客户端; 服务端; 多线程
北京理工大学珠海学院2014届毕业设计（论文）
LAN Instant Messaging System
Abstract Along with the high-speed development of the science and technology, the technology
based on computer network improved quickly. Various kinds of applications based on network was born, like information releasing, data sharing ... .The LAN technology as an essential part of our daily life are also widely used . People transfer and exchange data through LAN to connect with Internet. So it’s very necessary to develop a software which based on instant-message in LAN. So I make a new design, and implement it on windows platform. In my implementation the client and the server were separated in one program with multi thread mechanism and had a good GUI. It can satisfier most people’s demands. It was very easy to use and the function is very realizable. At last, it is also easy for expanding.
Key words LAN; Instant Messaging; Client; Server; Multi thread
北京理工大学珠海学院2014届毕业设计（论文）
目 录
1. 引言 ............................................................................................................................................................................. 1 1.1 课题背景及意义 ................................................................................................................................................... 1 1.2 课题现状 ............................................................................................................................................................... 1 1.3 研究目标 ............................................................................................................................................................... 2 1.4 开发平台与技术的选择及介绍 ........................................................................................................................... 2 1.4.1 开发环境的介绍........................................................................................................................................... 2 1.4.2 WINDOWS SOCKETS网络编程接口概述 ........................................................................................................ 3 1.4.3 Vc6.0开发平台简介 .................................................................................................................................... 3 1.4.4 access数据库 ............................................................................................................................................. 4 2. 需求分析及可行性研究 ............................................................................................................................................. 5 2.1 系统分析概况 ....................................................................................................................................................... 5 2.2 系统需求分析 ....................................................................................................................................................... 5 2.2.1 功能要求 ...................................................................................................................................................... 6 2.2.2 性能要求 ...................................................................................................................................................... 6 2.3 系统可行性研究 ................................................................................................................................................... 7 2.3.1 技术可行性 .................................................................................................................................................. 7 2.3.2 经济可行性 .................................................................................................................................................. 7 2.3.3 营运可行性 .................................................................................................................................................. 7 3. 系统设计及编码实现 ................................................................................................................................................. 8 3.1 系统基础认知 ....................................................................................................................................................... 8 3.1.1局域网简介 ................................................................................................................................................... 8 3.1.2 TCP/IP 协议 .............................................................................................................................................. 13 3.1.3Windows Sockets......................................................................................................................................... 15 3.2 体系结构设计 ..................................................................................................................................................... 17 3.3功能模块分析 ...................................................................................................................................................... 20 3.3.1整体架构分析 ............................................................................................................................................. 20 3.3.2 功能架构分析 ............................................................................................................................................ 21 3.3.3 核心模块分析及代码 ................................................................................................................................. 22 3.4 用户界面设计 ..................................................................................................................................................... 26 3.4.1 服务器端监控 ............................................................................................................................................ 26 3.4.2 聊天状态图 ................................................................................................................................................ 26 3.4.3 传输文件 .................................................................................................................................................... 27 4. 系统测试 ................................................................................................................................................................... 29 4.1 白盒测试 ............................................................................................................................................................. 29 4.1.1 测试环境配置 ............................................................................................................................................ 29 4.1.2 正确性测试 ................................................................................................................................................ 30 4.2 黑盒测试 ............................................................................................................................................................. 30 4.2.1测试环境配置 ............................................................................................................................................. 30
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