【作者】 徐洋；

【导师】 张斌；

【作者基本信息】 东北大学 ， 计算机软件与理论， 2005， 硕士

【摘要】 伴随着Internet的发展,Web服务组合给企业电子商务应用带来了前所未有的商机,它给服务提供者和应用开发者创造机会,利用组合Web服务来产生增值服务。然而,单个服务间常常是孤立的,彼此间没什么联系,各自完成一定的功能,如何把已有的Web服务组合起来成为当前研究的重点。 本文的研究正是以此应用为中心,以自助旅游这一特定领域为应用背景,按照服务本体的规范,设计并实现了一个面向服务设计的Web服务组合系统。该系统根据用户的需求,自动的为用户提供了从图形化设计到Web服务组合的动态选取及执行的完整过程。 本文的研究重点是对于Web服务组合的动态选取机制的研究。在进行了相关基础知识的介绍之后,本文对在Web服务组合问题的研究中所遇到的与服务的动态选取相关的问题进行了介绍,基于服务质量模型,采用动态规划算法来对服务进行选取,并用BPEL4WS规范来描述Web服务组合的业务流程行为。最后,本文详细的介绍了动态选取器以及其他相关模块的实现。更多还原

【Abstract】 Web Service composition brings a great chance to e_commerce application of enterprises along with the development of Internet. It has raised the opportunity for service providers and application developers to develop value-added services by combining existing web services. Internet has a lot of Web Service we can access, but most of them are in the state of isolation. Each of them has its own function, little relationship with others. Now how to compose Web Services that deal with creating complex services by using existing services to create a new Web Service is a hot research topic.The thesis focuses on this application to design and implement a Service Design Oriented Web Service Composition System based on budget travelling field and supported by service ontology. This system can automatically provide the whole process of Web Service composition from designing with graphics to choosing services dynamically and executing them after users bring up their requirements.The main content of this thesis is the mechanism of dynamic selection of Web Service. After introducing the research background, the thesis discusses the topic related to the Web Service composition and dynamic selection. Then the thesis uses the algorithm of dynamic layout to select the Services based on Web Service Quality Model and the specification of BPEL4WS to describe the business process of Web Service composition in the SDOWSCS system. In the end, the thesis gives the detailed process of realization of dynamic selection and implementation of other modules.更多还原