```java public ConfigurableApplicationContext run(String... args) { StopWatch stopWatch = new StopWatch(); stopWatch.start(); ConfigurableApplicationContext context = null; FailureAnalyzers analyzers = null; configureHeadlessProperty(); //獲取SpringApplicationRunListeners；從類路徑下META-INF/spring.factories SpringApplicationRunListeners listeners = getRunListeners(args); //回調所有的獲取SpringApplicationRunListener.starting()方法 listeners.starting(); try { //封裝命令行參數 ApplicationArguments applicationArguments = new DefaultApplicationArguments( args); //準備環境 ConfigurableEnvironment environment = prepareEnvironment(listeners, applicationArguments); //創建環境完成后回調SpringApplicationRunListener.environmentPrepared()；表示環境準備完成 Banner printedBanner = printBanner(environment); //創建ApplicationContext；決定創建web的ioc還是普通的ioc context = createApplicationContext(); analyzers = new FailureAnalyzers(context); //準備上下文環境;將environment保存到ioc中；而且applyInitializers()； //applyInitializers()：回調之前保存的所有的ApplicationContextInitializer的initialize方法 //回調所有的SpringApplicationRunListener的contextPrepared()； // prepareContext(context, environment, listeners, applicationArguments, printedBanner); //prepareContext運行完成以后回調所有的SpringApplicationRunListener的contextLoaded（）； //s刷新容器；ioc容器初始化（如果是web應用還會創建嵌入式的Tomcat）；Spring注解版 //掃描，創建，加載所有組件的地方；（配置類，組件，自動配置） refreshContext(context); //從ioc容器中獲取所有的ApplicationRunner和CommandLineRunner進行回調 //ApplicationRunner先回調，CommandLineRunner再回調 afterRefresh(context, applicationArguments); //所有的SpringApplicationRunListener回調finished方法 listeners.finished(context, null); stopWatch.stop(); if (this.logStartupInfo) { new StartupInfoLogger(this.mainApplicationClass) .logStarted(getApplicationLog(), stopWatch); } //整個SpringBoot應用啟動完成以后返回啟動的ioc容器； return context; } catch (Throwable ex) { handleRunFailure(context, listeners, analyzers, ex); throw new IllegalStateException(ex); } } ```