Expert one on one development without ejb读书笔记

第三章 架构

• ❑  Business services layer. This is central to successful applications.

• ❑  Presentation layer. This may be a UI or a remoting facade.

• ❑  Data access layer. Objects accessing a persistence store—usually, one or more relational databases.

业务服务层

表现层

数据访问层

业务服务层：

无状态or有状态对象