Spring管理Bean的三种创建方式

1.使用类构造器实例化  （90%以上都是使用这种）

<bean id=“orderService" class="cn.itcast.OrderServiceBean"/>

2.使用静态工厂方法实例化

<bean id="personService" class="cn.itcast.service.OrderFactory" factory-method="createOrder"/>

public class OrderFactory {

public static OrderServiceBean createOrder(){

return new OrderServiceBean();

}

}

3.使用实例工厂方法实例化:

首先要实例化工厂

<bean id="personServiceFactory" class="cn.itcast.service.OrderFactory"/>

<bean id="personService" factory-bean="personServiceFactory" factory-method="createOrder"/>

public class OrderFactory {

public OrderServiceBean createOrder(){

return new OrderServiceBean();

}

}