[Java Sprint] Autowire

Previous we have seen Constructore injection:https://www.cnblogs.com/answer1215/p/9484872.html

It would is easier to using autowire to reduce the code, and Autowite have four different types:

• Bytype
• ByName
• Constructor
• No

First let's see how to use ' autowire= ' constructor "':

    <name= "CustomerService"  class= " Com.pluralsight.service.CustomerServiceImpl "   autowire=" constructor ">         <!---    </beans>

We comment out constructor injection and using Autowire.

ByName:

 PackageCom.pluralsight.service;ImportCom.pluralsight.model.Customer;Importcom.pluralsight.repository.CustomerRepository;Importjava.util.List; Public classCustomerserviceimplImplementsCustomerService {//private Customerrepository customerrepository = new Hibernatecustomerrepositoryimpl ();    Privatecustomerrepository customerrepository;  PublicCustomerserviceimpl () {} PublicCustomerserviceimpl (customerrepository customerrepository) { This. Customerrepository =customerrepository; } //if set autowire by name, so in ApplicationContext <bean name= "customerrepository": >//if <bean name= "foo". > Then this function should is rename public void Setfoo (Customerrepository customerrepository)     Public voidsetcustomerrepository (customerrepository customerrepository) { This. Customerrepository =customerrepository; } @Override PublicList<customer>FindAll () {returnCustomerrepository.findall (); }}

<?XML version= "1.0" encoding= "UTF-8"?><Beansxmlns= "Http://www.springframework.org/schema/beans"Xmlns:xsi= "Http://www.w3.org/2001/XMLSchema-instance"xsi:schemalocation= "Http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd" >    <!--Define A class, using implementation -     <Bean  name= "Customerrepository"  class= " Com.pluralsight.repository.HibernateCustomerRepositoryImpl "></bean>     <!--Setter injection:inject Hibernatecustomerrepositoryimpl to Customerrepository -    <Beanname= "CustomerService"class= "Com.pluralsight.service.CustomerServiceImpl" autowire= "ByName" >        <!--<property name= "customerrepository" ref= "foo" ></property> -        <!--<constructor-arg index= "0" ref= "foo" ></constructor-arg> -    </Bean></Beans>

Bytype:

    <Beanname= "CustomerService"class= "Com.pluralsight.service.CustomerServiceImpl" autowire= "Bytype" >        <!--<property name= "customerrepository" ref= "foo" ></property> -        <!--<constructor-arg index= "0" ref= "foo" ></constructor-arg> -    </Bean>

It doesn ' t matter we use ' name= ' customerservice ' or ' name= ' foo ', because it finding by type, so still'll work.

[Java Sprint] Autowire