Html5中WebSocket协议关键技术的研究及基于WebSocket协议的实时Web通信系统的实现

发布时间：2018-07-23 13:09

【摘要】：互联网的飞速发展使得人们对实时通信的需求越来越迫切，实现实时通信的软件有成为互联网上第一大软件的趋势。实时Web应用是实现实时Web通信的主要方式，互联网上常用的实时Web应用有B/S(Browser/Server)和C/S(Client/Server)两种模式。在互联网高速发展的大环境下，实时Web应用成为实时通信技术领域研究的热点，并得到了广泛的实际应用。在WebSocket协议规范未被公布之前，开发者使用基于浏览器插件的技术、轮询和Comet技术来实现实时Web应用。但这些方式都有自己的缺陷，不是大量消耗服务器带宽和资源就是要不停地向服务器发送请求，导致大量时间和网络吞吐量的被浪费。于是，被冠以Web TCP美名的WebSocket协议产生了。本文首先研究了目前广泛使用的几种实时Web技术方案，分析了各种方案的不足；然后，对WebSocket协议实现原理及关键技术进行了深入研究，提出了一种基于WebSocket协议及WebRTC技术的方案实现实时Web通信。此技术方案能在一定程度上避免现有方案的不足，是一种更加高效便捷的实现方案。最后，本文在新的方案基础上设计并实现了一套完整的实时Web通信系统，并对此通信系统的性能与可行性进行了理论分析。在实现新系统的过程中，本文选用Java编程语言实现WebSocket Server；为提高系统的安全性与稳定性，选用SQLServer数据库以保存用户信息。同时，为了便于系统给普通用户提供服务，系统布局于常见的Windows IIS (Internet Information Services)平台，用户页面用ASP.NET实现。另外，本文还重点描述了如何获取用户实时资源，，包括实时视频、文件等，并给出了相关的处理方法。为了验证新实时Web通信系统的可行性，本文通过实验对其性能进行了评估。通过功能测试及对测试数据的分析，证明了本文实现的实时Web通信系统的合理性、可行性及实用性。
[Abstract]:With the rapid development of the Internet, the demand for real-time communication is becoming more and more urgent, and the software to realize real-time communication has become the largest software on the Internet. Real-time Web application is the main way to realize real-time Web communication. The commonly used real-time Web applications on the Internet are B / S (Browser/Server) and C / S (Client/Server) modes. With the rapid development of the Internet, the application of real-time Web has become a hot spot in the field of real-time communication technology, and has been widely used in practice. Prior to the publication of the WebSocket protocol specification, developers used browser-based plug-in technology, polling and Comet technologies to implement real-time Web applications. However, these methods have their own shortcomings, either consuming a large amount of server bandwidth and resources or constantly sending requests to the server, resulting in a lot of time and network throughput is wasted. As a result, the WebSocket protocol, known as Web TCP, came into being. This paper first studies several kinds of real-time Web technology schemes which are widely used at present, analyzes the shortcomings of various schemes, and then deeply studies the implementation principle and key technologies of WebSocket protocol. A scheme based on WebSocket protocol and WebRTC technology is proposed to realize real-time Web communication. This scheme can avoid the deficiency of the existing scheme to a certain extent and is a more efficient and convenient implementation scheme. Finally, a complete real-time Web communication system is designed and implemented on the basis of the new scheme, and the performance and feasibility of the communication system are analyzed theoretically. In order to improve the security and stability of the system, the SQLServer database is chosen to save the user information in order to improve the security and stability of the system. At the same time, in order to facilitate the system to provide services to ordinary users, the system is distributed on common Windows IIS (Internet Information Services) platforms, and user pages are implemented with ASP.NET. In addition, this paper mainly describes how to obtain real-time user resources, including real-time video, files and so on, and gives the relevant processing methods. In order to verify the feasibility of the new real-time Web communication system, this paper evaluates its performance through experiments. The rationality, feasibility and practicability of the real time Web communication system realized in this paper are proved by the function test and the analysis of the test data.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP393.04

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