Webservices-based Service-oriented Application Integration

With the development of internet/intranet and the distributed systems increasing, the application system integration is sharing us in the face. But tranditional Enterprise Application Integration (EAI) has not only a great way to dynamic expansibility and interoperating in isomerous systems but also been restricted by technical manufacture and appliction environments which is caused by the realization technology localization in interoperation, unification description of interface and loose couple etc. Service-oriented Architecture (SOA) is brought forward by Gartner Group. And with Web Services's development and maturation, SOA has realization technology support.Based on analyzing the shortage of traditional EAI resolvents, SOA is described in this paper. And the realization modes and key of SOA are also anatomized. Then "Web Services+SOA" is put forward as the optimal resolvent for EAI in actual technology level. Next the author designs the services-oriented application integration system framework which is realized with Web Services. And system's hiberarchy is also analyzed from software point of view.The paper emphatically states SOA implementing techniques, including Extensible Markup Language (XML), Web Services Description Language (WSDL), Simple Object Access Protocol (SOAP) and Universal Description, Discovery and Integration(UDDI).According to the integration system framework and realizatoin method, the author designs and develops human resource management system with J2EE, in which the uniform identy authentication coponent is developed as web service with .Net and integrated in human resource management system to validate Web Services-based service oriented application integration's spanning operation system, application system, database and programmer language chracteristic. Then Web Service-based XML data' s redisposing and legacy system EJB components' service encapsulation are also discussed in the paper.According to practice, SOAP binding HTTP can make integration system extensible and interoperable. WSDL can make system interface universal. UDDI can make integration agile. "Web Services+SOA"can realize not only bussiness function integration but also data integration. And it can expediently encapsulate legacy system to integrate with SOA system, having lower cost and realizing software reusing.