簡介

spring容器在創(chuàng)建當前bean時，會去調(diào)用接口BeanFactoryAware擴展點。BeanFactoryAware有個方法setBeanFactory，入?yún)⑹莃eanFactory。

重寫setBeanFactory方法，能夠獲取到spring容器，進而從spring容器獲取指定bean。如果該bean尚未創(chuàng)建，會觸發(fā)bean的創(chuàng)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);
    }
}