The Research & Development Of Three-Layers Distributed System Based On Web Service In Foreign Trade Business

With the change of the requirements from the enterprise users, the traditional twolayers application programs can no longer meet the requirement in terms of efficiency,multi-platform etc. In the meanwhile, because of the complexity of the foreign tradebusiness, the companies also want a suitable software to help their day-to-day work.From these two side, this paper bring in the idea of three layers distributed system,analysis the advantages and characters of it, explain the abstract layer of this system,discuss the issues such as system net structure, system structure, developing tools,system security control etc. Then based on a typical company in foreign trade business,this paper refines its business procedures, separates different business modules, designsdetails, lists key data flow charts, thus gives out a example of the realization of thesystem.