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耦合度高。

IOC

对象外部引入

1.导入Spring坐标

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

 

2.定义Spring管理类和接口

建立包

建立接口，点击之后会出现需要的

 

package dao;public interface BookDao {void save();
}

建立类

package dao.impl;import dao.BookDao;public class BookDaoImpl  implements BookDao {@Overridepublic void save() {System.out.println("bookdao save");}
}

建立service

重复上述步骤

package service;import java.awt.print.Book;public interface BookService {void addBook(Book book);
}

package service.impl;import service.BookService;import java.awt.print.Book;public class BookServiceImpl implements BookService {@Overridepublic void addBook(Book book) {System.out.println("bookservice save");}
}

 3.创建spring空间

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"><bean id="bookDao"   class="dao.impl.BookDaoImpl"></bean><bean id="bookService"   class="service.impl.BookServiceImpl"></bean>
</beans>

创建运行程序空间

import dao.BookDao;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import service.BookService;public class APP1 {public static  void main(String[] args) {//1.配置解析文件ClassPathXmlApplicationContext ioc= new ClassPathXmlApplicationContext("SpringContent.xml");// 2.通过工厂获取beanBookDao bookDao  =(BookDao) ioc.getBean("bookDao");// 3.使用功能bookDao.save();BookService bookService =(BookService) ioc.getBean("bookService");bookService.addBook();}
}

 运行