基于新型教育信息化终端的即时通讯系统设计与应用研究

发布时间：2018-01-02 12:37

本文关键词：基于新型教育信息化终端的即时通讯系统设计与应用研究　出处：《山东大学》2015年硕士论文　论文类型：学位论文

【摘要】：即时通讯(Instant Messaging)是指通信者通过互联网实现实时的信息交互。依托即时通讯可以实现即时消息收发、状态实时更新、语音视频通信、文件传输、虚拟场景等多种应用。即时通讯技术表现为多媒体、多功能、便携化、专业化、企业化、开放化等诸多发展方向。目前主流即时通讯产品均使用私有协议,不同的协议架构下的即时通讯产品无法实现互联互通,进而制约了即时通讯技术的进一步发展。可扩展消息与出席协议XMPP是一种基于可扩展标记语言XML的开放协议,用于提供即时通讯、在线状态探测等即时服务。XMPP的设计目标是实现包括异构协议框架下的任意网络实体的互联互通,即使其使用的操作系统、应用软件等并不相同。本文通过与当前主流网络通信协议对比发现XMPP协议在开放性、规范性、扩展性、安全性方面的优势。本论文通过对XMPP的研究与扩展,设计并实现了具有开放架构的即时通信系统,系统采用客户端/服务器架构。服务器IM Server为分布式、模块化设计,承担着即时通讯实体间的连接管理、会话管理、XML流转发等任务。客户端IMessager承担的任务包括人机交互、维持连接、解析XML等。客户端建立起与服务器的TCP长连接,经过身份认证建立会话后,通过双向的XML流与服务器通信。即时通讯会涉及到个人隐私与财产信息,仅通过用户名与密码进行用户身份认证,无法保证即时通讯系统的安全性,本文基于AES算法和RSA算法设计了组合加密策略,并在java开发环境中实现,为即时通讯系统提供安全传输保障。本系统可以提升教学的效率与互动性；同时兼容与异构即时通信系统的互联互通,方便教育信息化系统的扩展。对即时通讯系统进行测试,包括单节点服务器、多节点服务器和服务器集群测试。部署测试结果表明单台即时通讯服务器IM Server可以有效承载10万用户的并发访问,实现登陆注册、添加好友、收发消息、传送文件等功能；系统在分布式服务器架构下可以有效工作；带有负载均衡的IM Server集群可以承载更多的并发访问。新型教育信息化终端设备是于山东大学袁东风教授主持研发的“低成本、低能耗、高可靠、嵌入式终端与信息服务平台”项目的研究成果之一。依托项目团队研究的基础,实现了适用于教育领域的定制化、智能化教育云终端。该设备具备高性能的嵌入式硬件架构和定制的Android操作系统,为本文即时通讯系统的实现提供了很好的平台。
[Abstract]:Instant messaging (IM) means that the communicator can realize the real-time information exchange through the Internet. Depending on the instant messaging, the instant message can be sent and received, and the status can be updated in real time. Voice video communication, file transmission, virtual scene and other applications. Instant messaging technology for multimedia, multi-function, portable, professional, enterprise. At present, the mainstream instant messaging products all use private protocol, and the instant messaging products under different protocol framework can not achieve interconnection. The extensible message and attendance protocol (XMPP) is an open protocol based on extensible markup language (XML) to provide instant messaging. The design goal of real-time service. XMPP, such as online state detection, is to realize the interconnection of any network entity under the framework of heterogeneous protocols, even if it uses the operating system. The application software is not the same. This paper finds that the XMPP protocol is open, normative and extensible by comparing with the current mainstream network communication protocols. The advantages of security. Through the research and extension of XMPP, this paper designs and implements an open architecture instant messaging system. The system adopts client / server architecture. Server IM Server is distributed and modularized, which is responsible for connection management and session management between instant messaging entities. The tasks undertaken by the client IMessager include man-machine interaction, maintaining connection, parsing XML, etc. The client establishes a long TCP connection with the server. After establishing a session through identity authentication, it communicates with the server through a two-way XML stream. Instant messaging involves personal privacy and property information, and only authenticates the identity of the user by user name and password. Can not guarantee the security of the instant messaging system, this paper based on the AES algorithm and RSA algorithm to design a combined encryption strategy, and implemented in the java development environment. This system can improve the efficiency and interaction of teaching. At the same time, it is compatible with heterogeneous instant communication system, which is convenient for the expansion of educational information system. The instant communication system is tested, including single-node server. Multi-node server and server cluster test. Deployment test results show that a single instant messaging server IM Server can effectively host 100,000 users of concurrent access, login registration, add friends. Send and receive messages, transfer files and other functions; The system can work effectively under the distributed server architecture. The IM Server cluster with load balancing can carry more concurrent access. The new educational information terminal equipment is "low cost, low energy consumption and high reliability" developed by Professor Yuan Dongfeng of Shandong University. One of the research results of the embedded terminal and information service platform. Based on the research of the project team, the customization of the embedded terminal and information service platform is realized in the field of education. The intelligent education cloud terminal, which has high performance embedded hardware architecture and customized Android operating system, provides a good platform for the realization of the instant messaging system in this paper.
【学位授予单位】：山东大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN915.04

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