yiping的专栏

Core J2EE™ Patterns学习笔记Intercepting Filter You want to intercept and manipulate a request and a response before and after the request is processed.Front ControllerYou want a centralized access po

Application ControllerYou want to centralize and modularize action and view management.注1：Struts structure diagrame注2：Struts structure diagrame1.spring mvc请所有的请求都提交给DispatcherServlet,它会委托应用系统的其他模块负责负

Development Process1.Iterative and Waterfall ProcessesThe waterfall style breaks down a project based on activity. To build software, you have to do certain activities: requirements analysis, design,

1, 事务脚本 vs. 领域模型（Transaction Script vs. Domain Model）作者基于功能的复杂性来区分两种模式的使用时机，却忽略了另外一个因素：功能的增加领域模型将功能和数据置于同一个对象中，当需要增加新的功能时，只能通过为对象增加新的方法来实现，这造成了对象接口的不稳定，并无法在没有源代码的情况下进行功能增加而事务脚本则可以灵活的进行功能的扩展：增加一个