@Controller, @service, @repository, @component differences

1、@controller controller （ Injection service 、 Use in Controller layer ）

Used to label the control layer , amount to struts Medium action layer

2、@service service （ Inject dao、 Use in Service layer ）

For tagging the service layer , It is mainly used for business logic processing

3、@repository（ Realization dao visit 、 Use in Mapper layer ）

Used to label data access layer , It can also be used to label data access components , namely DAO Components .

4、@component （ Put ordinary pojo Instantiate to spring In the container , Equivalent to the configuration file ）

It refers to all kinds of components , That is to say, when our classes do not belong to various categories （ Do not belong to @Controller、@Services When waiting ）, We can use @Component To label this class .

explain ：

<context:component-scan base-package=”com.*”>
The example above is the introduction of Component Examples of components , among base-package Represents all subpackages that need to be scanned .
Common ground ： By @controller 、@service、@repository 、@component Annotated classes , These classes will be included in spring Manage in containers