IOC入门案例

一、导入坐标

<dependency>
           	<groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.2.10.RELEASE</version>
 </dependency>

二、定义spring管理的接口、类

public interface BookDao {
    public void save();
}
public class BookDaoImpl implements BookDao {
    public void save() {
        System.out.println("book dao save...");
    }
}

public interface BookService {
    public void save();
}
public class BookServiceImpl implements BookService {
    private BookDao bookDao = new BookDaoImpl();
    public void save() {
        System.out.println("book service save");
        bookDao.save();
    }
}

三、创建spring配置文件

配置对应类作为spring管理的bean

<bean id="bookDao" class="com.he.dao.impl.BookDaoImpl"/>
<bean id="bookService" class="com.he.service.Impl.BookServiceImpl"/>

四、初始化容器，并获取bean对象

public static void main(String[] args) {
        //3.获取IOC容器
        ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
        //4.获取bean
        BookDao bookDao = (BookDao) ctx.getBean("bookDao");
        BookService bookService = (BookService) ctx.getBean("bookService");
        bookService.save();
        bookDao.save();

    }