Spring（Bean）6

生命周期
构造 ---》set---》Bean

 

init前后执行 （新创建 类）

public class MyBeanPostProcesser implements BeanPostProcessor{


//在init方法之前执行
//Object bean: 当前正在初始化的bean对象
//String beanName:当前正在初始化的bean的id值.
@Override
public Object postProcessBeforeInitialization(Object bean, String beanName)
throws BeansException {
System.out.println("postProcessBeforeInitialization "+beanName);

}

//做一些校验的工作 校验数据的合法性等.
//因为是通过Car类来演示的，因此就直接强转了.

//if(bean instanceof XXX)
Car car = (Car)bean ;
car.setPrice(450000);
return bean;
}

//在init方法之后执行

@Override
public Object postProcessAfterInitialization(Object bean, String beanName)
throws BeansException {
System.out.println("postProcessAfterInitialization "+ beanName);

Car car = new Car();
car.setBrand("bmw");
car.setPrice(100000);

return car;
}

}