@Overridepublic void refresh() throws BeansException, IllegalStateException {synchronized (this.startupShutdownMonitor) {// Prepare this context for refreshing.准备刷新context
            prepareRefresh();// Tell the subclass to refresh the internal bean factory.刷新子类beanFactory，注册beanDefinitionConfigurableListableBeanFactory beanFactory = obtainFreshBeanFactory();// Prepare the bean factory for use in this context.准备beanfactory
            prepareBeanFactory(beanFactory);try {// Allows post-processing of the bean factory in context subclasses.
                postProcessBeanFactory(beanFactory);// Invoke factory processors registered as beans in the context.
                invokeBeanFactoryPostProcessors(beanFactory);// Register bean processors that intercept bean creation.
                registerBeanPostProcessors(beanFactory);// Initialize message source for this context.
                initMessageSource();// Initialize event multicaster for this context.
                initApplicationEventMulticaster();// Initialize other special beans in specific context subclasses.
                onRefresh();// Check for listener beans and register them.
                registerListeners();// Instantiate all remaining (non-lazy-init) singletons.初始化非懒加载的bean实例
                finishBeanFactoryInitialization(beanFactory);// Last step: publish corresponding event.
                finishRefresh();}catch (BeansException ex) {logger.warn("Exception encountered during context initialization - cancelling refresh attempt", ex);// Destroy already created singletons to avoid dangling resources.
                destroyBeans();// Reset 'active' flag.
                cancelRefresh(ex);// Propagate exception to caller.throw ex;}}}

finishBeanFactoryInitialization(beanFactory)