Model的意思是模型，Model承载的作用就是数据的抽象， Model其实就是一组数据的集合，通常为数据库实体层 ，即数据库中的一张表对应一个实体类。整个系统都可以看成是数据的流动，既然要流动，就一定是有流动的载体。
Service的意思是服务，即业务逻辑层，它的目的是 提供一个服务 。这个服务可能是一系列的数据处理，也可能是调用别的服务。
Dao(data access object)的意思是数据存储对象，它主要是负责和底层数据库通信，即对数据库进行增删改查等基础操作（ 访问数据库，向数据库发送sql语句，完成数据的增删改查任务 ）。
Controller的意思是控制器，即 把握全局 、控制流程，所有的指令都从这里发出。
它们之间的关系：
Controller 层调用Service interface去控制业务流程，最底层的即为model，model定义的为实体类，dao层中封装了很多常用的增删改查方法（例如：deleteByProperties、getByProerties、queryByProerties、updateByProper等方法），它会调用model层，从而对数据库进行操作；Service层建立在Dao层之上Controller层之下，建立了Dao层后才可以建立Service层，service层调用dao层接口，接收dao层返回的数据，完成项目的基本功能设计；而Controller层又建立在Service层之上，因而controller层接受前端请求，调用service层，接收service层返回的数据，最后返回具体的页面和数据到客户端，每个模型都有一个Service接口，每个接口分别封装各自的业务处理方法。
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