毕业设计论文TCP协议下的即时通讯软件的实现.doc

PAGE TCP协议下的即时通讯软件的实现 摘 要 即时通信(Instant Message)，由于其具有实时性、跨平台性、成本低、效率高等优点而受到广泛的使用。设计并实现一个能够处理多用户进行实时、安全的即时通信系统具有较强的现实意义。即时通信的底层通信是通过SOCKET套接字接口实现的。当前的主流UNIX系统和微软的WINDOWS系统都在内核提供了对SOCKET字接口的支持。使用这个统一的接口，可以编写一个可移植的TCP/IP通信程序。使信息能够在INTERNET上可靠的传输。 本文设计并实现了基于局域网内的简单即时通信系统，系统采用C/S模式，底层通信通过SOCKET套接字接口实现，服务器负责客户端的登录验证，好友信息的保存和心跳报文的发送。客户端采用P2P方式实现消息传递，并能实现文件的传输。本文首先讨论了同步套接字，异步套接字，多线程并发执行任务等；然后阐述了客户端、服务器如何使用XML序列化的消息进行通信。 关键词：即时通信；文件传输；套接字；TCP协议 The Design and Implementation of Simple Instant Message Software Based on TCP Protocol Abstract Instant messages have several advantages such as real-time, cross-platform, cheap and efficient. To design a Multi-user IM (instant message) architecture is very important in both theory and realism. Instant message based on TCP/IP protocol that is realized by socket interface. Almost all UNIX operation systems and Microsofts windows operation systems provide support of socket in the kernel. Using the uniform interface, we can develop a portable program of TCP/IP, which help us transfer information in Internet safely and credibly. The system uses the client/server(C/S) mode. The server takes the responsibility of the login message of client, the saving of friend message and Message heartbeat. The transmission of the basic messages of the customer end will be designed on P2P architecture. This thesis explains how the client and server communicate via serializing XML message. Key words: Instant Message; File Transfer; Socket; TCP protocol 目 录 论文总页数：28页 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc174246985 1 引言 PAGEREF _Toc174246985 \h 1 HYPERLINK \l _Toc174246986 1.1 课题背景 PAGEREF _Toc174246986 \h 1 HYPERLINK \l _Toc174246987 1.2 国内外研究现状 PAGEREF _Toc174246987 \h 1 HYPERLINK \l _Toc174246988 1.2.1 国外研究现状 PAGEREF _Toc174246988 \h 1 HYPERLINK \l _Toc174246989 1.2.2 国内研究现状 PAGEREF _Toc174246989 \h 2 HYPERLINK \l _Toc174246990 1.3 本课题研究的意义 PAGEREF _Toc174246990 \h 2 HYPERLINK \l _Toc174246991 1.4 本课题的研究方法 PAGEREF _Toc174246991 \h 2