[sping]xml配置文件中factory-bean与factory-method(spring使用工厂方法注入bean)

抄写自：https://www.cnblogs.com/vickylinj/p/9474597.html

public class CarFactory {
   //非静态方法
   public Car createCar(){
       Car car = new Car();
       car.setBrand("BMW");
       return car;
   }
   
   //静态方法
   public static Car createStaticCar(){
       Car car = new Car();
       return car;
   }
}

1.对于非静态方法createCar的注入方式：

非静态方法：必须实例化工厂类（factory-bean）后才能调用工厂方法

<?xml version="1.0" encoding="UTF-8" ?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
         http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

    <!-- 工厂方法-->
    <bean id="carFactory" class="com.baobaotao.ditype.CarFactory" />
    <bean id="car5" factory-bean="carFactory" factory-method="createCar">
    </bean>


</beans>

2.对于静态方法createStaticCar的注入方式：

静态方法：无须创建工厂类实例的情况下就可以调用工厂类方法

<?xml version="1.0" encoding="UTF-8" ?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns:p="http://www.springframework.org/schema/p"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
         http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

    <bean id="car6" class="com.baobaotao.ditype.CarFactory"
        factory-method="createStaticCar"></bean>

</beans>

总结：

factory-bean：用于实例化工厂类；

factory-method：用于调用工厂类方法