通过讨论可以发现：基于J2EE和MVC模式的多层体系结构为搭建具有可伸缩性、灵活性、易维护性的商务系统提供了良好的机制。
Through discussion, we have found a multi-tier architecture based on J2EE and MVC pattern which provides a good mechanism for a telescopic, flexible and easy maintaining business system.
提出为了适应数字城市向智能城市进化，数字城市系统的构建必须满足开放性、易拓展性、可重用性、可动态适应的智能性等特征。
Then it demonstrates that current Digital City system should be open, scalable, reusable, dynamically and intelligently adaptable to events, in order to evolve from now into future intelligent City.
因此如何将旧的遗留系统再生至一个具有高可靠性、易维护性，又能方便弹性地根据企业策略而调整服务内容的可扩展性系统，是一项迫切的需求。
Consequently, how to reengineering the Legacy System to a high reliability, maintainability Scalable System that can adjust the service content conveniently and flexibly is an urgent requirement.
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