public void refresh() throws BeansException, IllegalStateException {
synchronized(this.startupShutdownMonitor) {this.prepareRefresh(); // 准备工作
ConfigurableListableBeanFactory beanFactory =this.obtainFreshBeanFactory(); // 获取ConfigurableListableBeanFactory最终的目的是
DefaultListableBeanFactorythis.prepareBeanFactory(beanFactory); // 准备bean工厂try {this.postProcessBeanFactory(beanFactory); // 一个空的实现，注意这里的
spring版本号为：5.3xthis.invokeBeanFactoryPostProcessors(beanFactory); // 注册bean的工厂this.registerBeanPostProcessors(beanFactory);this.initMessageSource(); // Spring 从所有的 @Bean 定义中抽取出来了
BeanPostProcessor，然后都注册进 beanPostProcessors，等待后面的的顺序调用 注册
BeanPostProcessorthis.initApplicationEventMulticaster(); // 初始化事件监听多路广播器this.onRefresh(); // 一个空的实现this.registerListeners(); // 注册监听器this.finishBeanFactoryInitialization(beanFactory); // 到了spring加载流
程最复杂的一步，开始实例化所有的bdthis.finishRefresh();// 刷新完成工作
} catch (BeansException var9) {if (this.logger.isWarnEnabled()) {this.logger.warn("Exception encountered during context
initialization - cancelling refresh attempt: " + var9);
}this.destroyBeans();this.cancelRefresh(var9);throw var9;
} finally {this.resetCommonCaches();
}
}
}