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();
}

}