SpringBoot是如何动起来的

程序入口

SpringApplication.run(BeautyApplication.class, args);
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执行此方法来加载整个SpringBoot的环境。

1. 从哪儿开始？

SpringApplication.java

/** * Run the Spring application, creating and refreshing a new * {@link ApplicationContext}. * @param args the application arguments (usually passed from a Java main method) * @return a running {@link ApplicationContext} */
	public ConfigurableApplicationContext run(String... args) {
		//...
  }
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调用SpringApplication.java 中的 run 方法，目的是加载Spring Application，同时返回 ApplicationContext。

2. 执行了什么？

2.1 计时

记录整个Spring Application的加载时间！

StopWatch stopWatch = new StopWatch();
stopWatch.start();
// ...
stopWatch.stop();
if (this.logStartupInfo) {
	new StartupInfoLogger(this.mainApplicationClass)
			.logStarted(getApplicationLog(), stopWatch);
}
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2.2 声明

// 声明 ApplicationContext
ConfigurableApplicationContext context = null;
// 声明 一个异常报告集合
Collection<SpringBootExceptionReporter> exceptionReporters = new ArrayList<>();
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2.3 指定程序运行模式

指定 java.awt.headless，默认是true 通常是在程序开始激活headless模式，告诉程序，如今你要工做在Headless mode下，就不要期望硬件帮忙了，你得自力更生，依靠系统的计算能力模拟出这些特性来。

private void configureHeadlessProperty() {
	System.setProperty(SYSTEM_PROPERTY_JAVA_AWT_HEADLESS, System.getProperty(
			SYSTEM_PROPERTY_JAVA_AWT_HEADLESS, Boolean.toString(this.headless)));
}
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2.4 配置监听并发布应用启动事件

SpringApplicationRunListener 负责加载 ApplicationListener事件。

SpringApplicationRunListeners listeners = getRunListeners(args);
// 开始
listeners.starting();
// 处理全部 property sources 配置和 profiles 配置，准备环境，分为标准 Servlet 环境和标准环境
ConfigurableEnvironment environment = prepareEnvironment(listeners,applicationArguments);
// 准备应用上下文
prepareContext(context, environment, listeners, applicationArguments,printedBanner);
// 完成
listeners.started(context);
// 异常
handleRunFailure(context, ex, exceptionReporters, listeners);
// 执行
listeners.running(context);
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getRunListeners 中根据 type = SpringApplicationRunListener.class 去拿到了全部的 Listener 并根据优先级排序。 对应的就是 META-INF/spring.factories 文件中的 org.springframework.boot.SpringApplicationRunListener=org.springframework.boot.context.event.EventPublishingRunListener

private <T> Collection<T> getSpringFactoriesInstances(Class<T> type, Class<?>[] parameterTypes, Object... args) {
		ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
		// Use names and ensure unique to protect against duplicates
		Set<String> names = new LinkedHashSet<>(
				SpringFactoriesLoader.loadFactoryNames(type, classLoader));
		List<T> instances = createSpringFactoriesInstances(type, parameterTypes,
				classLoader, args, names);
		AnnotationAwareOrderComparator.sort(instances);
		return instances;
	}
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在 ApplicationListener 中 , 能够针对任何一个阶段插入处理代码。

public interface SpringApplicationRunListener {

	/** * Called immediately when the run method has first started. Can be used for very * early initialization. */
	void starting();

	/** * Called once the environment has been prepared, but before the * {@link ApplicationContext} has been created. * @param environment the environment */
	void environmentPrepared(ConfigurableEnvironment environment);

	/** * Called once the {@link ApplicationContext} has been created and prepared, but * before sources have been loaded. * @param context the application context */
	void contextPrepared(ConfigurableApplicationContext context);

	/** * Called once the application context has been loaded but before it has been * refreshed. * @param context the application context */
	void contextLoaded(ConfigurableApplicationContext context);

	/** * The context has been refreshed and the application has started but * {@link CommandLineRunner CommandLineRunners} and {@link ApplicationRunner * ApplicationRunners} have not been called. * @param context the application context. * @since 2.0.0 */
	void started(ConfigurableApplicationContext context);

	/** * Called immediately before the run method finishes, when the application context has * been refreshed and all {@link CommandLineRunner CommandLineRunners} and * {@link ApplicationRunner ApplicationRunners} have been called. * @param context the application context. * @since 2.0.0 */
	void running(ConfigurableApplicationContext context);

	/** * Called when a failure occurs when running the application. * @param context the application context or {@code null} if a failure occurred before * the context was created * @param exception the failure * @since 2.0.0 */
	void failed(ConfigurableApplicationContext context, Throwable exception);

}
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3. 每一个阶段执行的内容

3.1 listeners.starting();

在加载Spring Application以前执行，全部资源和环境未被加载。

3.2 prepareEnvironment(listeners, applicationArguments);

建立 ConfigurableEnvironment； 将配置的环境绑定到Spring Application中；

private ConfigurableEnvironment prepareEnvironment( SpringApplicationRunListeners listeners, ApplicationArguments applicationArguments) {
		// Create and configure the environment
		ConfigurableEnvironment environment = getOrCreateEnvironment();
		configureEnvironment(environment, applicationArguments.getSourceArgs());
		listeners.environmentPrepared(environment);
		bindToSpringApplication(environment);
		if (this.webApplicationType == WebApplicationType.NONE) {
			environment = new EnvironmentConverter(getClassLoader())
					.convertToStandardEnvironmentIfNecessary(environment);
		}
		ConfigurationPropertySources.attach(environment);
		return environment;
	}
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3.3 prepareContext

配置忽略的Bean；

private void configureIgnoreBeanInfo(ConfigurableEnvironment environment) {
		if (System.getProperty(
				CachedIntrospectionResults.IGNORE_BEANINFO_PROPERTY_NAME) == null) {
			Boolean ignore = environment.getProperty("spring.beaninfo.ignore",
					Boolean.class, Boolean.TRUE);
			System.setProperty(CachedIntrospectionResults.IGNORE_BEANINFO_PROPERTY_NAME,
					ignore.toString());
		}
	}
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打印日志-加载的资源

Banner printedBanner = printBanner(environment);
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根据不一样的WebApplicationType建立Context

context = createApplicationContext();
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3.4 refreshContext

支持定制刷新

/** * Register a shutdown hook with the JVM runtime, closing this context * on JVM shutdown unless it has already been closed at that time. * <p>This method can be called multiple times. Only one shutdown hook * (at max) will be registered for each context instance. * @see java.lang.Runtime#addShutdownHook * @see #close() */
	void registerShutdownHook();
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3.5 afterRefresh

刷新后的实现方法暂未实现

/** * Called after the context has been refreshed. * @param context the application context * @param args the application arguments */
	protected void afterRefresh(ConfigurableApplicationContext context, ApplicationArguments args) {
	}
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3.6 listeners.started(context);

到此为止， Spring Application的环境和资源都加载完毕了； 发布应用上下文启动完成事件； 执行全部 Runner 运行器 - 执行全部 ApplicationRunner 和 CommandLineRunner 这两种运行器

// 启动
callRunners(context, applicationArguments);
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3.7 listeners.running(context);

触发全部 SpringApplicationRunListener 监听器的 running 事件方法