跟我学Spring3 学习笔记一

 

public interface HelloApi {
	public void sayHello();  

}

 

 

public class HelloImpl implements HelloApi{

	public void sayHello() {
		System.out.println("Hello World ! ");
	}

}

 

 

<?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:p="http://www.springframework.org/schema/p"
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="   
	    http://www.springframework.org/schema/beans
	    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd   
	    http://www.springframework.org/schema/context        
	    http://www.springframework.org/schema/context/spring-context-3.0.xsd">

	<!-- id 表示你这个组件的名字，class表示组件类 -->
	<bean id="hello"
		class="com.HelloImpl"> 
		
	</bean>

</beans>

 

public class HelloImplTest {

	@Test
	public void testSayHello() {
		//ClassPathXmlApplicationContext: ApplicationContext实现， 
		// 以classes为根目录算起
		//1、读取配置文件实例化一个Ioc容器
		ApplicationContext context = new ClassPathXmlApplicationContext("helloworld.xml");
		//2、从容器获取Bean，注意此处完成 “面向接口编程，而不是面向实现”
		HelloApi helloApi = context.getBean("hello",HelloApi.class);
		//3、执行业务逻辑
		helloApi.sayHello();
		
		//XmlBeanFactory 从classpath 或 文件系统等获取资源(项目根目录)
		File file = new File("helloworld.xml");
		Resource resource = new FileSystemResource(file);
		                  // = new ClassPathResource("helloworld.xml");
		BeanFactory beanFactory = new XmlBeanFactory(resource);
		                  //  = new XmlBeanFactory(resource);
		HelloApi helloApi2 = (HelloApi)beanFactory.getBean("hello");
		helloApi2.sayHello();
		
		// FileSystemXmlApplicationContext：ApplicationContext实现，
		// 从文件系统获取配置文件(项目根目录)
		BeanFactory beanFactory2 = new FileSystemXmlApplicationContext("helloworld.xml");
		HelloApi helloApi3 = (HelloApi)beanFactory2.getBean("hello");
		helloApi3.sayHello();
	}

}