| A complicated network environment has come into being in recent years as the rapid development of e-commerce,Internet technology and XML technology.The Web service which has single function is hard to meet the needs of enterprises and users in such a network environment.In order to satisfy the demands of enterprises and users' combine the current network of Web services,form large-grained services will be the effective ways.At the same time,combination of existing Web service can improve the efficiency of software development and integration,and better network resources sharing.Hence,people pay a lot of attention currently to obtain more satisfactory Web service that combined in network.Through the research on Web service composition based on BPMN of literature,related technology and theory,this thesis mainly focused on the following several points for research.Firstly,we put forward the improved model of Web service composition based on BPMN;meanwhile analyze the function of modules and the interaction between them.Secondly,we present a service selection algorithm which is divided into two steps:In the first place select an item according to the service of function,and then choose one option according to the quality of service that taking the impact of factors between Qu's into account.This algorithm can meet the users' and enterprises' requirements of Web service are selected more effectively.Thirdly,parameters matching algorithm was proposed in Web service composition model,which binding corresponding relation of service parameters in early phase and later automatic matching parameters.The BPMN to BPEL conversion algorithm based on template was come up with finally.Series of experiments are performed to verify the Web service composition model and the selected algorithm.Experimental results show that the model and the algorithm is practicability and efficient.At the end of the paper,we discussed the deficiencies of the research content and the direction of further improvement. |
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