服務導向架構應用軟體元件鬆散藕合組成，系統規劃採用「持續累積服務」，跳脫以往緊耦合設計，並且強調系統之間溝通與資料交換，站在更宏觀的角度與高度進行系統規劃，因為當我們面臨重大問題時，與問題同一個水平思維是無法解決問題，必須提升至更高的層次，如此才能真正解決問題，因此SOA所帶來的變革不僅僅是技術上提升，更具管理意涵，讓系統規劃變成由上而下（top-down）的發展進程。SOA對IT產業帶來衝擊，強調了整合、溝通與重複使用的服務精神，期望能建構真正持續改善且不斷降低資訊成本的系統規劃與發展。 本研究使用服務導向思維，透過jBPM工作流程引擎（jBPM Workflow Engine）結合Apache Axis2實作Web Services，並且利用雙向SSL憑證協議確保資訊安全與身分認證，於Android手機進行資料交換，提出行動化簽核系統的藍圖。 Service-oriented architecture applications are composed of loosely coupled software components; therefore, system planning use "continuous accumulation of service" can go beyond tightly coupled design, and then integrate communication and information exchange between systems. Planning and starting from a broad point of view will be the most efficient way to solve problems. The changes brought by the SOA not only technical upgrade but also lead system planning become top-down development process. SOA results in a huge impact in IT industry, it emphasizes system integration, communication and re-use of the service, and then expects to build sustained improvement and reduce the cost of information systems planning and development. In this study, based on service-oriented architecture, we will combine jBPM workflow engine implementation with Apache Axis2 Web Services, plus the use of two-way SSL protocol to ensure information security and certificate authentication on the Android phone. It can provide a blueprint for workflow management system.
