说明：  企业级应用程序架构历经了多年的发展演进，其设计思想已发生了巨大变化。回顾其发展历程，大型机和个人计算机盛行的早期，大多数企业级应用程序安装在单个机器上，并采用双层架构即客户端/服务器端架构。随着软件分层思想的引入以及Internet技术的迅猛发展，目前的企业级软件架构模型逐渐演变成三层架构甚至是n(n>3)层架构，其中尤以基于Web的应用开发为典型代表。
(Enterprise application architecture to evolve through the years, and its design has changed dramatically. Recalling its development process, mainframe and personal computers prevailed early, most enterprise applications are installed on a single machine, and using double-architecture that is a client/server architecture. With the introduction of the software as well as hierarchical thinking rapid development of Internet technology, the current enterprise software architecture evolved into a three-tier model even n (n> 3) layer architecture, especially Web-based application development for typical .)