| Web services are currently the standard frameworks for constructing cross-enterprise distributed applications and infrastructure of Enterprise-Business-Integration solution based on SOA. Web services composition has become the bridge between information infrastructures based on Web services and enterprise business integration. Only when application programs and business processes can together implement complex business applications through Web services composition, could Web services technique be brought into complete-play. Therefore, the problem how to compose distributed and autonomous Web services available into new enterprise business applications has become a hotspot problem of software engineering field.With the requirements above, we have investigated some important issues of dynamic service composition. The comtributions of this dissertation are as follows:The paper have summarized the research progress on services composition home and abroad and have been described as examples and their advantages and disadvantages been analyzed.BPEL4WS is the first choice among standards about Web services composition currently, but it isn't entirely suitable for services dynamic composition, so this dissertation give a method about Web services dynamic composition based on process template. This method introduce a agent to discovery and select adequate Web services, and it considered about the characters of BPEL4WS standard and it's engine.Lots of study on Web services selection based on semantic has been done, but the QoS attributes of Web services is signaficient to consumer, so this dissertation introduce a method about service selection based on QoS. This method extend current technique standard and get well effection. |
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