Spring扩展接口-BeanFactoryAware

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简介

调用时机：spring容器在创建当前bean时，会去调用接口BeanFactoryAware扩展点。

public interface BeanFactoryAware extends Aware {
    void setBeanFactory(BeanFactory beanFactory) throws BeansException;
}

BeanFactoryAware有个方法setBeanFactory，入参是beanFactory。重写时，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。

用途示例

内部获取Spring的BeanFactory，封装获取bean的工具类。

@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);
    }
}