The Research Of Web Services Architecture And Applications

Web Services is a kind of new distributed computing model. It is the combination of correlative technologies such as, XML, SOAP, WSDL and UDDI, etc. Web Services has the characteristics of platform independency and language independency, and its main objective is to construct a technology layer that is independent of platform or programming language on the basis of various kinds of different existing platforms. The applications on all kinds of platform rely on this technology layer to implement the mutual connection and integration, so Web Services creates a kind of open distributed system that makes any enterprise and individual in any place can utilize Web Service and engage in business activities and other various kinds of activities.Firstly this paper discusses the Web Services Architecture, three important roles (service provider, service requestor, service broker), and the relationship among them. And introduces especially Web Services Protocol Stacks, including SOAP, WSDL, XML and UDDI.Secondly a Application Model Based on the Web Services framework is presented, then the building processes of every role in this system and the call relationship among them are described by some examples of inquiring Periodic table and Fast Fourier Transform algorithm; Finally, the Web Services platform independence is verified by several Web Services applications developed on difference platforms.Thirdly this paper discusses the UDDI mechanism, UDDI data structure, and UDDI programmer API. A UDDI Registry Prototype based on JUDDI is implemented, and services can be published or deleted from the registration center.At last this paper discusses the service's security and solution, and demonstrates how to enhance web service security by using J2EE Web Application default accessing control, Servlet Filter accessing control and SSL/HTTPS protocol.The research of this paper is very useful and practical for the application of Web Services.