分布式多层Web应用系统的实现

随着Internet/Intranet的高速发展 ,基于Web的应用系统的开发越来越受到人们的重视 “Web+数据库”的两层系统结构是目前Web系统开发中使用的主要方式 ,但实践证明 :以此开发出的应用系统存在着Web服务器负荷过重、执行效率不高以及缺乏延展性等一些缺陷 ,难以应付中大型应用的需求 文中结合现今流行的COM/DCOM、CORBA组件技术 ,从系统构成、负载平衡、核心技术几方面介绍了分布式组件技术在Web系统中的应用 ,着重论述了“中间层”对提高Web系统性能的重要作用 ,并在此基础上实现了一个分布式多层Web应用系统 与两层结构的Web应用系统相比 ,该系统具有较高的灵活性、安全性和执行效率

The Implementation of a Distributed Multilayer Web-Based Application System

With the rapid development of Internet/Intranet, web-based applications play more and more important roles in people's life. The two-layer application structure—the traditional “web+database" structure—has such defects as heavy burden on the web server,system inflexibility,etc. Distributed component techniques, such as COM/DCOM and CORBA, provide a standard model for packaging services and exposing them to other applications. This paper introduces a multilayer components-based approach to designing and developing web-based applications.The distributed component techniques are described in terms of the system organization, the load balance and the vital techniques. And the importance of the middle layer in improving the web-based system's performance is presented. On this basis, a distributed multilayer web-based application is implemented, which makes the web-based system more flexible,safer and more efficient.