The Design And Implementation Of Web Services Support System In J2EE Application Server

As the use of internet spreads and deepens in all fields, how tointegrate the applications running in distributed heterogeneousenvironments becomes an urgent problem. Since the existing distributedobject technologies (such as COBRA, RMI and DCOM) have technicallimitations, web services has become an ideal solution to address theproblem.Web services use XML as the base for their description, discoveryand binding. Due to the open nature of XML, the differences between thesystems of various component model, operating system and programminglanguage are eliminated. Compared with the existing Distributed objecttechnologies, Web services can be easily integrated, loosely coupled,dynamically composed, etc. J2EE is a standard framework fordevelopment of multi-tier distributed enterprise applications, and providesfull support for the web services. Web Services for J2EE specificationdefines how Web services are supported in J2EE application server.This thesis first describes the web services architecture and relatedprotocols, and discusses the document structure and analytic techniques of XML and WSDL files in detail. It also introduces the theories andtechniques of the implementation of J2EE web services. Based on theabove, the thesis presents an implement plan of web services supportsystem in a J2EE application server. Then it describes the implementationdetails of the following major system functions: (1)services invocation:including stateless EJB and servlet-based web services invocation.(2)services deployment: automatic deployment and un-deployment of Webservices in J2EE component.(3)services management: management of thedeployed services and monitoring of the services performance. (4)servicestesting: including how to automatically generate user interfaces accordingto the WSDL description, dynamically construct services invocationinformation and invoke the services by the WSDL document and the userinput value.This thesis expatiates on the implementation of the web servicessupporting system. The system provides an integrated supportenvironment for web services deployment, running, management andtesting, thus facilitates user's web service applications.