Spring第四弹—–Spring的三种实例化bean的方式
1.使用类构造器实例化
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<bean id=“orderService" class="cn.itcast.OrderServiceBean"/>
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2.使用静态工厂方法实例化
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<bean id="personService" class="cn.itcast.service.OrderFactory" factory-method="createOrder"/>
public class OrderFactory {
public static OrderServiceBean createOrder(){
return new OrderServiceBean();
}
}
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PS:其中class是工厂类, factory-method是生成你所需bean的工厂方法。
示例：
工厂类:
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package zmc;
public class PersobnSevicebeanFactory {
public static PersonServicebean createOrder(){
return new PersonServicebean();
}
}
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配置文件：
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<bean id="personService2" class="zmc.PersobnSevicebeanFactory" factory-method="createOrder"></bean>
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3.使用实例工厂方法实例化:
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<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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PS:此时要先实例化工厂类，再使用此工厂类的工厂方法来创建所需要的bean，其中factory-bean为工厂bean的名字（id)。
示例：
工厂类：
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package zmc;
public class PersobnSevicebeanFactory {
public PersonServicebean createOrder2(){
return new PersonServicebean();
}
}
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配置文件：
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<bean id="personServiceFactory" class="zmc.PersobnSevicebeanFactory"></bean>
<bean id="personService3" factory-bean="personServiceFactory" factory-method="createOrder2"></bean>
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