您的位置:首页 > 编程语言 > Java开发

spring实例化bean之简单工厂实例方法实例化

2013-08-21 22:25 639 查看
PersonDao

public interface PersonDao {

}

PersonDaoImpl
public class PersonDaoImpl implements PersonDao{

public PersonDaoImpl(){
System.out.println("spring通过构造方法来实例化对象");
}
}
DaoFactory
public class DaoFactory {

public DaoFactory(){
System.out.println("工厂类实例化");
}

public PersonDao createPersonDao(){
return new PersonDaoImpl();
}

}
applicationContext.xml
<?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-2.5.xsd"> <!-- spring来实例化工厂类 -->
<bean id="beanFactory" class="com.xxc.initBean.three.factory.DaoFactory"></bean>

<!-- spring用已经实例化好的工厂类的指定方法实例化dao -->
<bean id="personDao" factory-bean="beanFactory" factory-method="createPersonDao"></bean>
</beans>


测试类:spring先实例化了工厂类,然后调用工厂类中的方法实例化了dao
public class App {
public static void main(String[] args) {
ApplicationContext ac = new ClassPathXmlApplicationContext("com/xxc/initBean/three/applicationContext.xml");
PersonDao personDao = (PersonDao)ac.getBean("personDao");
}
}
内容来自用户分享和网络整理,不保证内容的准确性,如有侵权内容,可联系管理员处理 点击这里给我发消息
标签: 
相关文章推荐