学位论文--即时通讯系统设计说明书.doc

本科毕业设计（论文）说明书 即时通讯系统的设计与实现 学 院 计算机工程学院 专业班级 09软件工程1班 摘 要 即时通讯软件是目前计算机用户进行交流最普遍的方式之一，各种各样的聊天软件也层出不穷；服务提供商也提供了越来越丰富的通讯服务功能。即时通信中最基本的功能就是通过计算机之间的文本数据的互换的形式实现思想的交流和沟通，它的优点是方便快捷，为人们之间创建了一种新型的、廉价的、快速的、简便的沟通方式。本文分析了即时通讯系统的原理及其实现过程，探讨了Socket技术与多线程技术在C/S模式下的局域网即时通讯系统的应用。本毕业设计就是模拟 QQ 聊天软件，开发一个包括文字聊天、文件传输等功能的聊天软件。系统主要采用C/S架构、C#编程语言、.NET开发平台、UDP通信协议以及Socket等技术来完成。主要实现的功能有注册、登录、聊天、发送表情以及文件传输等功能。系统采用客户机/服务器（C/S）的模式设计，是一个三层C/S结构，数据库服务器、应用程序服务器端、应用程序客户端，按照此设计思想，可以将任务合理分配到客户机端和服务器端 ，从而降低了系统的通信开销。此系统共分为两个模块：客户端模块和服务器端模块。通过运行、测试与分析，该多功能聊天软件运行稳定、可靠，具有一定的实用价值。即时通讯； C#Abstract Instant messaging software is currently one of the most common computer users to communicate the way, a variety of chat software also emerge in an endless stream; the service provider offers more and more communication services. Instant communication is the most basic function is the text data by computer are realized in the form of the exchange of ideas and communication, it has the advantage of convenience, as a new, cheap, fast, convenient way to communicate to create among the people. This paper analyzes the principle of instant communication system and its realizing process, discusses the application of Socket network technology and multithreading technology in C\/S mode of instant messaging system. This graduation design is to simulate the QQ chat software, the development of a text chat, file transfer and other functions of the chat software. The system mainly uses C/S architecture, C# programming language,.NET development platform, UDP protocol and Socket technology to complete. The main function of registration, login, chat, send expression and file transfer functions. The system uses a client / server (C/S) mode design, is a three layer C/S structure, database server, application server, client application program, according to the design idea, the system uses the C/S structure, the rational allocation of tasks to the client side and server, wh