三种实例化bean的方式

知识点：

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1.使用类构造器实例化 

<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: 

<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(); 

 } 

} 



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