视频地址：https://www.youtube.com/watch?v=RA9ag2v4Gq8 代码地址：https://github.com/gaohanghang/Spring/blob/master/springcore

讲解

容器管理对象的生命周期

Application Context

Coding Step by Step 逐步编码

代码地址：https://github.com/gaohanghang/Spring/blob/master/springcore

public class Main1 {

    public static void main(String[] args) {
        EmailService emailService = new EmailService();
        emailService.sendEmail("[email protected]", "Hello from Miss Xing");
    }

}

BeanFactory 获取实例

public class Main2 {

    public static void main(String[] args) {
        //BeanFactory beanFactory = new XmlBeanFactory(new ClassPathResource("spring.xml"));
        BeanFactory beanFactory = new ClassPathXmlApplicationContext("spring.xml");
        EmailService emailService = beanFactory.getBean("emailService", EmailService.class);

        emailService.sendEmail("[email protected]", "Hello from Miss Xing");
    }

}

ApplicationContext 获取实例

通过xml获取实例

public class Main3 {

    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml");
        EmailService emailService = context.getBean("emailService", EmailService.class);

        emailService.sendEmail("[email protected]", "Hello from Miss Xing");
    }

}