Spring学习笔记之通过FactoryBean配置Bean

//自定义的FactoryBean需要实现FactoryBean接口

public class CarFactoryBean implements FactoryBean<Car>{

private String brand;

public void setBrand(String brand) {
this.brand = brand;
}

//返回bean的对象
@Override
public Car getObject() throws Exception {
// TODO Auto-generated method stub
return new Car(brand, 600000);
}

@Override
public Class<?> getObjectType() {
// TODO Auto-generated method stub
return Car.class;
}

@Override
public boolean isSingleton() {
// TODO Auto-generated method stub
return true;
}

}

Main.java

public class Main {
public static void main(String[] args) {

ApplicationContext ctx = new ClassPathXmlApplicationContext("beans-beanfactory.xml");

Car car =(Car) ctx.getBean("car");
System.out.println(car);
}

}

beans-beanfactory.xml配置

通过factoryBean 来配置Bean的实例

class:指向FactoryBean的全类名

property:配置FactoryBean的属性

但实际返回的实例确实FactoryBean的getObject()方法返回的实例！

<bean id="car" class="com.jhh.spring.beans.factorybean.CarFactoryBean">
<property name="brand" value="BMW"></property>
</bean>

运行结果

Car [brand=BMW, price=600000.0]