ABSTRACT
With the development of Web, the distributed system has been the main choice to the users. For example, the Electronic Commerce systems, the grid system, P2P share system, the intelligence system of enterprises’ dynamic alliance are distributed systems. And the appearing of loud computing has highlighted the advantage of distributed systems. Cloud computing is the development of distributed computing, parallel computing and grid computing. In other words, cloud computing is the commercialization of these computer concepts. The basic principle of cloud computing is to distribute computing on lots of distributed computers, not on local computers or remote servers. The operation of enterprises’ data centers is similar with the Internet. Thus enterprises can switch its resource to the application in need and access computers and storage system accordingly. The distributed Web system is main stream of system integration technology and also the orientation of system integration and its solution.
