Spring's commonly used label @repository, @controller, @service

In annotaion configuration annotations, @component is used to represent a generic annotation that describes a class as a spring container-managed class. That is, the class has been pulled into spring management. And @controller, @Service, @Repository is @component refinement, these three annotations have more semantics than @component, they correspond to the control layer, service layer, persistence layer class.

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


For example:

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

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

}

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

@Service is a Iserviceimpl class file for the service layer, and functions similar to @repository.



Another label: @autowired 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 the setter method.

We also have to have a configuration file 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>

This allows all of the. *daoimpl,.*serviceimpl under the Com.zxr.manager package to be registered with the spring container.