生命周期案例

@SuppressWarnings("all")

@Repository

@Scope("singleton")

public class BookDaoImpl implements BookDao {

    public void save(){

        System.out.println("BookDaoImpl save rning...");

    }

    @PostConstruct

    public void init(){

        System.out.println("bookdaoimpl init rning...");

    }

    @PreDestroy

    public void destroy(){

        System.out.println("bookdaoimpl destroy rning...");

    }

}

public void test(){

        ApplicationContext c = new AnnotationConfigApplicationContext(SpringConfig.class);

        BookDao dao = c.getBean(BookDao.class);

        System.out.println(dao);

        BookDao dao1 = c.getBean(BookDao.class);

        System.out.println(dao1);

        dao.save();

    }

public void test(){

//        ApplicationContext 中不具有 registerShutdownHook 关闭钩子的方法

        AnnotationConfigApplicationContext c = new AnnotationConfigApplicationContext(SpringConfig.class);

//        设置关闭钩子

        c.registerShutdownHook();

        BookDao dao = c.getBean(BookDao.class);

        System.out.println(dao);

        BookDao dao1 = c.getBean(BookDao.class);

        System.out.println(dao1);

        dao.save();

    }