Spring扩展接口-BeanFactoryAware

简介

spring容器在创建当前bean时，会去调用接口BeanFactoryAware扩展点。BeanFactoryAware有个方法setBeanFactory，入参是beanFactory。

重写setBeanFactory方法，能够获取到spring容器，进而从spring容器获取指定bean。如果该bean尚未创建，会触发bean的创建流程。

示例

@Service
public class BeanFactoryUtils implements BeanFactoryAware {
    private BeanFactory beanFactory;


    @Override
    public void setBeanFactory(BeanFactory beanFactory) {
        this.beanFactory = beanFactory;
    }

    public <T> T getBean(String beanName) {
        return (T) beanFactory.getBean(beanName);
    }
}