SpringBoot 上下文 Bean 工具类

@Component
public class BeanContextUtil implements BeanFactoryAware {
    private static DefaultListableBeanFactory listableBeanFactory;

    @Override
    public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
        listableBeanFactory = (DefaultListableBeanFactory) beanFactory;
        listableBeanFactory.setAllowBeanDefinitionOverriding(true);
    }

    /**
     * 创建单例的bean
     */
    public void registerSingleton(String beanName, Object object) {
        listableBeanFactory.registerSingleton(beanName, object);
    }

    /**
     * 销毁单例的bean
     */
    public void destroySingleton(String beanName) {
        listableBeanFactory.destroySingleton(beanName);
    }

    /**
     * 通过名称获取bean
     */
    public Object getBean(String beanName) {
        if (containsBean(beanName)) {
            return listableBeanFactory.getBean(beanName);
        } else {
            return null;
        }
    }

    /**
     * 判断上下文是否有这个bean
     */
    public boolean containsBean(String beanName) {
        return listableBeanFactory.containsBean(beanName);
    }
}