SpringApplication初始化

SpringApplication:
	Object[] sources) {
	0) {
	.asList(sources));
	}
	= deduceWebEnvironment();
	// 从spring.factories里读取所有 ApplicationContextInitializer，并记入 SpringApplication
	Collection) getSpringFactoriesInstances(
	.class));
	// 从spring.factories里读取所有 ApplicationListener，并记入 SpringApplication
	.class));
	= deduceMainApplicationClass();
	}
	.. args) {
	StopWatch();
	.start();
	null;
	null;
	configureHeadlessProperty();
	// 从spring.factories里读取所有 SpringApplicationRunListener，监听springboot启动，参考：org.springframework.boot.context.event.EventPublishingRunListener
	= getRunListeners(args);
	.starting();
	try {
	DefaultApplicationArguments(
	args);
	= prepareEnvironment(listeners,
	applicationArguments);
	= printBanner(environment);
	// web环境下默认的 ApplicationContext： org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext
	// 非web环境下默认的 ApplicationContext： org.springframework.context.annotation.AnnotationConfigApplicationContext
	= createApplicationContext();
	FailureAnalyzers(context);
	// org.springframework.cloud.bootstrap.config.PropertySourceBootstrapProperties 会通过 ApplicationContextInitializer，准备 PropertySource
	// PropertySourceBootstrapProperties 收集 PropertySourceLocator 来获得PropertySource
	// 其中 org.springframework.cloud.config.client.ConfigServicePropertySourceLocator 是 Cloud Config Client 提供的 PropertySourceLocator
	prepareContext(context, environment, listeners, applicationArguments,
	printedBanner);
	// 调用 context.refresh
	refreshContext(context);
	afterRefresh(context, applicationArguments);
	null);
	.stop();
	.logStartupInfo) {
	.mainApplicationClass)
	.logStarted(getApplicationLog(), stopWatch);
	}
	return context;
	}
	Throwable ex) {
	handleRunFailure(context, listeners, analyzers, ex);
	IllegalStateException(ex);
	}
	}