三种实例化Spring中Bean对象的方式

1、使用类构造器实例化。

<!-- 使用类构造器实例化bean -->

<bean id="stockService" class="cn.itcast.service.impl.StockServiceImpl"></bean>

2、使用静态工厂方法实例化bean

<!-- 使用静态工厂方法实例化bean -->

<bean id="personServiceFactory" class="cn.itcast.service.impl.PersonServiceBeanFactory" factory-method="createPersonServiceBeanFactory"></bean>

3、使用实例化工厂方法实例化bean

<!-- 使用实例化工厂方法实例化bean-->

<!--首先实例化工厂对象 -->

<bean id="personServiceFactory2" class="cn.itcast.service.impl.PersonServiceBeanFactory"></bean>

<!-- 在实例化Bean对象 -->

<bean id="personServiceFactory3" factory-bean="personServiceFactory2" factory-method="createPersonServiceBeanFactory2"></bean>

 

package cn.itcast.service.impl;

public class PersonServiceBeanFactory {
public static PersonServiceBean createPersonServiceBeanFactory() {
return new PersonServiceBean();
}
public PersonServiceBean createPersonServiceBeanFactory2() {
return new PersonServiceBean();
}
}

测试Case
@Test public void instanceSpring3() {
ApplicationContext ctx = new ClassPathXmlApplicationContext("beans.xml");
PersonService personService = (PersonService)ctx.getBean("personServiceFactory3");
personService.save();
}