springboot启动流程

stopWatch.stop();

context = createApplicationContext();

ApplicationListener

listeners.running(context)

LiquibaseServiceLocatorApplicationListener实现了ApplicationListener接口

void starting()

void onApplicationEvent(E event);

listeners.contextPrepared(context)

listeners.started(context)

Headless模式赋值

invokeListener

发送ApplicationContextInitializedEvent

这里的new ApplicationStartingEvent会对后面使用什么样的Listener产生影响

listeners.contextLoaded(context)

可以看到由于在EventPublishingRunListener中的starting方法中，调用multicastEvent方法时传入的event类型是ApplicationStartingEvent，所以这里会调用LiquibaseServiceLocatorApplicationListener这个监听器的onApplicationEvent方法

初始化失败分析器

listener.starting();

配置环境模块，发送ApplicationEnvironmentPreparedEvent

SpringApplicationRunListeners

starting()

计时器计时

listeners.starting();

发送ApplicationPreparedEvent

printBanner(environment);

SimpleApplicationEventMulticaster

onApplicationEvent

关联springboot组件和应用上下文对象

SpringApplication.run()

LiquibaseServiceLocatorApplicationListener

createApplicationContext()

refreshContext(context)

发送ApplicationReadyEvent

发送ApplicationStartedEvent

public void onApplicationEvent(ApplicationStartingEvent event)

加载sources到context

刷新上下文

multicastEvent(..)

调用框架启动扩展类

发送ApplicationStartingEvent

计时器停止计时

EventPublishingRunListener

context.setEnvironment(environment)postProcessApplicationContext(context)

SpringApplicationRunListener

创建应用上下文

打印banner