Java EE：在哪里可以了解dao，服务以及为什么使用它们？ [英] Java EE: Where could I read about dao, services and why they're used?

问题描述

确定
我是新来的工作，现在我被分配到一个使用Spring，Hibernate和Wicket的项目。
而且我看到了很多DAO和服务包，我想了解为什么要使用它们以及它的优点。

Ok I'm new at my job, and now I'm assigned to a project which uses Spring, Hibernate and Wicket. And I see a lot of DAO and Services packages and I want to understand why they're used and what is advantajes of this.

我知道DAO它需要使用数据库，但是我想了解更多信息。

I understand that DAO it's need for working with the databases, but I want more information.

我需要DAO和Services层的总体图片。

I need an overall, a BIG PICTURE of DAO and Services layers.

推荐答案

看看 Spring in Action 。本书解释了Spring，DAO和服务的所有基本方面。

Take a look at Spring in Action. This book explains all essential aspects of Spring, DAOs and services.

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