DTO 模式的研究及对其实现的改进

在多层架构的分布式软件系统中，如何在层间交换数据，采用何种粒度的对象交换数据，是系统构建时经常遇到的问题。作为J2EE核心设计模式之一的数据传输对象模式的提出，就是为了解决该问题的。通过对数据传输对象模式的研究和分析，针对在架构基于Internet的、分布式的企业级应用中所遇到的问题，吸取了多数据传输对象模式的优点，结合工厂模式和策略模式，利用接口来抽象，提出了一种改进的数据传输对象模式的实现方案，并且应用到了实际软件项目中，从实践中证明了该解决方案是满足可插入性的设计原则的。

Research and improving implementation for DTO pattern

It is a common problem for the designer to exchange data in different layers and use which kind of granularity in multi-layers architecture software system . As one of the core patterns of J2EE , data transfer object pattern is presented to solve the problem. Based on the practical problem faced when constructing a distributed enterprise application on internet and the research and analysis of data transfer object pattern , this paper put forward an improved solution plan which uses interface to abstract from factory pattern and strategy pattern . The solution has been used in actual software project and proved that it is feasible and can meets the requirement of design rule well.