Spring_注入外部Bean

主要实现service层调用dao层

1. 导入jar
   
2. 写类、接口

public interface UserDao {
    public  void update();
}

public class UserDaoImpl implements UserDao {
    @Override
    public void update() {
        System.out.println("dao update...............");
    }
}

public class UserService {
//创建UserDao的属性，生成set方法
    private UserDao userDao;
    public void setUserDao(UserDao userDao) {
        this.userDao = userDao;
    }
    public void add(){
        System.out.println("service add.........");
        userDao.update();
    }
}

3. 写bean.xml文件

<bean id="userService" class="com.atguigu.spring5.service.UserService">
        <property name="userDao" ref="userDaoIpml"></property>
    </bean>
    <bean id="userDaoIpml"  class="com.atguigu.spring5.dao.UserDaoImpl"></bean>

4. 结果

 @Test
    public void testBean1(){
//        加载spring配置文件
        ApplicationContext context =
                new ClassPathXmlApplicationContext("bean2.xml");
//        获取配置文件对象
        UserService userService = context.getBean("userService", UserService.class);
        userService.add();
    }

最后

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