Research And Implementation Of Automatic Web Service Composition Based On QoS Aware Purchasing System

With the rapid development of the logistics industry and the Internet,there are more and more logistics services appearing on the Internet.How to find and combine these large and functional Web logistics services,and then to achieve a more powerful and meet the needs of users of the function,which is the current research hot spots.In the fast-growing environment of Web services,the traditional Web service composition method can not be suitable for large-scale data.So how to automatically generate QoSaware Web logistics service composition according to the user's request is a problem that needs to be solved in this thesis.This thesis has done the following work:(1)This thesis proposes an improved Web service composition framework for logistics.Based on the Web service composition framework,this framework combines the functions and nonfunctional attributes of the logistics Web service,which can automatically find and match the service according to the user's needs,then optimize the QoS of the service composition,and finally provide the solution of the logistics service composition problem.(2)This thesis presents a four-stage optimization algorithm based on QoS-aware logistics service composition.Firstly,the semantic matching is used to generate the service composition graph.Second,the algorithm of the shortest path is used to calculate the optimal QoS of the service composition graph.Third,through the backtracking traversal to remove useless services and redundant services.Finally,the backward algorithm is used to extract the minimum service composition with optimal QoS.Through this algorithm,we can automatically discover and combine the minimum service composition satisfying multiple QoS standards from the large number of Web services provided by the logistics service provider.This thesis demonstrates the efficiency of the proposed method by a series of simulation experiments.(3)The logistics Web service composition system based on the framework and algorithm is designed,and the system is implemented on the book purchasing system.