The Research And Application Of Web Service Composition Based On J2EE

With the evolution of services-oriented architecture based on web services, providing supports for compositing distributed and autonomous web services into business applications has become a key research area in software engineering.Web services composition supports more powerful and more complete business functions, through the composition of complex servicess from simpler ones on the Internet according to certain business processing logics. By dynamically composing existing web services, we haven't to rewrite complex code and can adapt well to the variety evolution of the commerce environment. Agility of business applications will be obtained through web services composition technologies.This thesis is concentrated on exploring web services composition technology on services-oriented architecture system for concrete applications.First this thesis elaborates concepts of the web services and web services composition technology, makes complete introduction of web services's system structure, its essential technology, running mechanism and the technical superiority, then introduces a kind of language, business process execution language(BPEL), for web services composition technology. Lastly, presentes and realizes an on-line shopping system model, analyzes each module constitution and their mutual relations based on web services and web services composition technology.Considering the union of BPEL and the Java language, the BPELJ is introduced, which uses the BPEL and the Java, that are two kinds of programming language,to construct services-flow application. Through inserting Java code snippet into the BPEL, it enables web services to cooperate well, and facilitates the development of the web services composition application.The key point of this thesis is to apply web services composition technology to services-oriented architecture system to fully utilize the web services's mutual operational superiority...