Spring commonly used tags @repository, @controller, @service

In the Annotaion configuration note, @component is used to represent a generic comment to illustrate that a class is a spring container-managed class. That is, the class has been pulled into the management of spring. And @controller, @Service, @Repository is the refinement of @component, these three annotations with more semantics than @component, they correspond to the control layer, service layer, the class of the persistence layer respectively.

The @Repository tag is used to define a name for the class of the persistence layer, so that spring is associated with the class based on the name.


For example:

@Repository ("Userdao")
public class Userdaoimpl implements userdao{

........................................

}

Declares the name of Userdaoimpl in the spring container called Userdao.

The @Service is a Iserviceimpl class file for the service layer, similar in function to @repository.



Another tag: @autowired is used to inject.

For example:

@autowired
Private Userdao Userdao;

This is injected into the equivalent of a new implementation class, so we don't have to write setter methods.

We also have to have configuration files to configure:

<?xml version= "1.0" encoding= "UTF-8"?>
<beans xmlns= "Http://www.springframework.org/schema/beans"
Xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop= "HTTP://WWW.SPRINGFRAMEWORK.ORG/SCHEMA/AOP"
xmlns:tx= "Http://www.springframework.org/schema/tx"
xmlns:context= "Http://www.springframework.org/schema/context"
xsi:schemalocation= "Http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/ Spring-beans-2.5.xsd
Http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd
HTTP://WWW.SPRINGFRAMEWORK.ORG/SCHEMA/AOP http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
Http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd ">
<context:annotation-config/>
<context:component-scan base-package= "Com.zxr.manager" >
<context:include-filter type= "regex" expression= ". *daoimpl"/>
<context:include-filter type= "regex" expression= ". *serviceimpl"/>
</context:component-scan>
</beans>

In this way, all the. *daoimpl,.*serviceimpl under the Com.zxr.manager package are registered to be associated with the spring container.