Spring 類構造器創建Bean

一、創建接口

 

public interface PersonService { public void save(); }

 

二、創建實現類

public class PersonServiceBean implements PersonService { public void save(){ System.out.println("Save Method is running!."); } }

 

 

三、創建測試類

import org.junit.BeforeClass; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class PersonServiceBeanTest { @BeforeClass public static void SetUpBeforeClass() throws Exception{ } @Test public void instanceSpring(){ ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml"); PersonService personService = (PersonService) context.getBean("personService"); personService.save(); } } 

 

 

四、beans.xml

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="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-2.5.xsd"> <bean id = "personService" class="com.test.spring.test.PersonServiceBean"></bean> </beans>

 

 

五、說明

先申明這個是我的理解，我覺的spring裏面的bean就是配置該調用哪個類去實現對應的接口，在沒有用spring之前，我們是手動的創建，比如：interfaceName iName = new interfaceNameImplement（）；，用了spring之後我們就那這個傢伙寫在配置文件裏面.