在日常开发中，我们经常需要从 Spring 容器中获取 Beans。但是你知道如何获取 Spring 容器对象吗？

1. BeanFactoryAware 接口

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

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

    public void add() {
        Student student = (Student) beanFactory.getBean("student");
    }
}

实现 BeanFactoryAware 接口，然后重写 setBeanFactory 方法。从这个方法中，可以获取 Spring 容器对象。

2.ApplicationContextAware 接口

@Service
public class StudentService2 implements ApplicationContextAware {
    private ApplicationContext applicationContext;

    @Override
    public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
        this.applicationContext = applicationContext;
    }

    public void add() {
        Student student = (Student) applicationContext.getBean("student");
    }
}