Bean的依赖注入方式--构造方法

 

package ioc1.it.dao;

public class userDaoImpl implements userDao {
    public userDaoImpl() {
        System.out.println("无参");
    }

    @Override
    public void save() {
        System.out.println("kachaq");
    }
}

 

        <bean id="userDao" class="ioc1.it.dao.userDaoImpl"></bean>
        <bean id="service" class="factory.service">
                <constructor-arg name="userDao" ref="userDao"></constructor-arg>
        </bean>

 

public class test2 {
    public static void main(String[] args) {
        ClassPathXmlApplicationContext app = new ClassPathXmlApplicationContext("applicationContext.xml");
        service service = (service)app.getBean("service");
        service.save();

    }
}