用UML设计与实现基于Windows DNA的在线考试系统

【作者】 吴丽贤；

【导师】 鱼滨；

【作者基本信息】 西北大学 ， 计算机软件与理论， 2003， 硕士

【摘要】 随着Internet／Intranet技术和多媒体技术的发展，远程教育逐步显示出其潜在的优势。远程考试是远程教学的一个重要组成部分，随着教学内容的不断丰富和参加远程教育人群的增加，要求在线考试系统能不断地升级、增强功能，而且能很好地解决访问量高度集中时，所引起的负荷过重问题。所以，建立一个具有高度伸缩性，灵活性、稳定性且可扩充、易维护的考试系统是远程教育发展的一个重要环节。 本文在研究开发在线考试系统中，借助Rose工具将UML语言和Web应用开发结合起来，进行可视化建模。利用UML的用例图、类图、时序图、合作图、组件图和部署图等，定义系统需求，描述系统设计。将Web页面、组件对象、数据表和数据库都作为类或对象，按照真实世界的观点进行建模。依据软件工程学的观点来制定设计开发步骤。该系统以Windows DNA体系结构为基础，充分利用COM+组件、Windows 2000提供的各项底层服务和三层模式的灵活性来简化开发过程，优化系统的性能，提高系统的开发价值。更多还原

【Abstract】 With the development of Internet/Intranet and multimedia technologies, remote education shows its educational potential advantages gradually. Remote examination is a significant part of remote education. With the teaching content continually enriched and an increasing number of people entering for study, the online examination system is required to upgrade itself more functions continually, and to resolve the problem of overweight loading by mass access. Therefore, building an examination system with high flexibility, stability, extensibility and maintainability is important for the development of remote education.In this study of developing an online examination system, UML is integrated into the development of web application in virtue of Rose to get visual system model. The system requirements and design models are defined by UML diagrams such as Use Case diagram, Class diagram, Sequence diagram, Collaboration diagram, Component diagram, and Deployment diagram. Web pages, component objects, data tables and databases are all regarded as a class or an object. The modeling process bases on the views of real world. The design and development process is established according to the views of Software Engineering. The online examination system which bases on Windows DNA can fully use the COM+, the rock-bottom services provided by Windows 2000 and the flexibility of three-tier model to optimize the system performance and to enhance the development value.更多还原