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基于J2EE技术的网上购物系统.doc


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基于J2EE技术的网上购物系统
摘要
网上商店是电子商务的典型应用。大多数网上商店系统是基于两层体系结构来进行设计和开发的。的飞速发展,传统的两层体系结构面临着严峻的挑战,其中最为突出的问题是开发负担重、维护困难等。
J2EE是构建电子商务系统的新兴技术,采用J2EE技术,可以方便地将系统分离为三层:表示层、业务层及数据库层。表示层向客户的浏览器提供基于Web的显示页面;业务层处理客户购物过程;数据层则提供数据存储。采用这种层次结构可以提高系统的扩展性和服务器的效率,方便开发。
本文针对目前网上商店所面临的问题,采用J2EE技术,设计开发了一个网上商店系统。系统具有高可靠性、可扩展性和可重用性的特点。
系统中采用多种设计模式来提高系统性能:采用前台控制器来方便地实现导航;采用复合视图来向用户提供Web显示,减少了视图中代码的重复;采用业务代表降低各层之间的耦合;并在业务层中采用值对象来向表示层提供数据。
系统使用了J2EE中的多种技术,如EJB、JSP、Servlet、JDBC、JNDI等。系统以国产达梦数据库管理系统DM3作为后台数据库,在BEA WebLogic、IBM WebSphere、Borland Application Server等应用服务器上部署成功。
关键词:多层体系结构,J2EE,EJB,部署,网上商店,DM3
Design and Implementation of J2EE-based Virtual Store
Abstract
Virtual store is a typical system of E-Business. Virtual store system usually uses two-tier architecture. With the rapid development of , traditional two-tier architecture faces rigorous challenges, such as the heavy burden of development and the difficulty of maintenance, etc.
J2EE is a new technology to build up E-Business systems. Adopting J2EE, we can separate a application to three tiers: presentation tier, business tier and database tier. Presentation tier provides the view for the browser. Business tier handles the request of client and database tier provides data for the application. This three-tier architecture can improve application’s scalability, server’s efficiency, and it’s also convenient for development.
In this paper, we analyzes the ings of current virtual store, and adopts J2EE to design and implement a virtual store system. This system has several features such as high reliability, scalability and reusability. This system uses several design patterns to improve its performance. We use front controller to realize the navigation. We posite view which lowers the reduplicative code to provide views and business delegate to lower the coupling between two tiers. Meanwhile we use value object to provide data for presentation tier.
This system adopts several technologies of J2EE, such as JSP, Servlets, EJB, JDBC,

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  • 时间2011-05-12
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