=================进入getOrCreateEnvironment()private ConfigurableEnvironment getOrCreateEnvironment() { if (this.environment != null) { return this.environment; } switch (this.webApplicationType) { case SERVLET: //如果是原生servlet编程 return new StandardServletEnvironment(); case REACTIVE: //如果是响应式编程 return new StandardReactiveWebEnvironment(); default: return new StandardEnvironment(); } }====================进入configureEnvironment()protected void configureEnvironment(ConfigurableEnvironment environment, String[] args) { //给环境增加一些类型转换器 if (this.addConversionService) { ConversionService conversionService = ApplicationConversionService.getSharedInstance(); environment.setConversionService((ConfigurableConversionService) conversionService); } //加载(读取)内部配置源 //即读取所有的配置源的配置属性值 configurePropertySources(environment, args); //激活Profiles环境 configureProfiles(environment, args); }==========进入configurePropertySources()protected void configurePropertySources(ConfigurableEnvironment environment, String[] args) { //获取到所有配置源 MutablePropertySources sources = environment.getPropertySources(); DefaultPropertiesPropertySource.ifNotEmpty(this.defaultProperties, sources::addLast); //命令行信息 if (this.addCommandLineProperties && args.length > 0) { String name = CommandLinePropertySource.COMMAND_LINE_PROPERTY_SOURCE_NAME; if (sources.contains(name)) { PropertySource<?> source = sources.get(name); CompositePropertySource composite = new CompositePropertySource(name); composite.addPropertySource( new SimpleCommandLinePropertySource("springApplicationCommandLineArgs", args)); composite.addPropertySource(source); sources.replace(name, composite); } else { sources.addFirst(new SimpleCommandLinePropertySource(args)); } } }==============进入environmentPrepared（）void environmentPrepared(ConfigurableBootstrapContext bootstrapContext, ConfigurableEnvironment environment) { doWithListeners("spring.boot.application.environment-prepared", (listener) -> listener.environmentPrepared(bootstrapContext, environment)); }所有配置源
创立IOC容器 createApplicationContext()
protected ConfigurableApplicationContext createApplicationContext() { return this.applicationContextFactory.create(this.webApplicationType); }=============依据以后的利用类型（Servlet）创立容器//以后会创立AnnotationConfigServletWebServerApplicationContextApplicationContextFactory DEFAULT = (webApplicationType) -> { try { switch (webApplicationType) { case SERVLET: return new AnnotationConfigServletWebServerApplicationContext(); case REACTIVE: return new AnnotationConfigReactiveWebServerApplicationContext(); default: return new AnnotationConfigApplicationContext(); } } catch (Exception ex) { throw new IllegalStateException("Unable create a default ApplicationContext instance, " + "you may need a custom ApplicationContextFactory", ex); } };筹备ApplicationContext IOC容器的根本信息 prepareContext()
private void prepareContext(DefaultBootstrapContext bootstrapContext, ConfigurableApplicationContext context, ConfigurableEnvironment environment, SpringApplicationRunListeners listeners, ApplicationArguments applicationArguments, Banner printedBanner) { //保留后面的根底环境 context.setEnvironment(environment); //IOC容器的后置解决流程。 postProcessApplicationContext(context); //利用初始化器：applyInitializers applyInitializers(context); listeners.contextPrepared(context); bootstrapContext.close(context); if (this.logStartupInfo) { logStartupInfo(context.getParent() == null); logStartupProfileInfo(context); } // Add boot specific singleton beans ConfigurableListableBeanFactory beanFactory = context.getBeanFactory(); beanFactory.registerSingleton("springApplicationArguments", applicationArguments); if (printedBanner != null) { beanFactory.registerSingleton("springBootBanner", printedBanner); } if (beanFactory instanceof DefaultListableBeanFactory) { ((DefaultListableBeanFactory) beanFactory) .setAllowBeanDefinitionOverriding(this.allowBeanDefinitionOverriding); } if (this.lazyInitialization) { context.addBeanFactoryPostProcessor(new LazyInitializationBeanFactoryPostProcessor()); } // Load the sources Set<Object> sources = getAllSources(); Assert.notEmpty(sources, "Sources must not be empty"); load(context, sources.toArray(new Object[0])); listeners.contextLoaded(context); }================== postProcessApplicationContext(context);protected void postProcessApplicationContext(ConfigurableApplicationContext context) { if (this.beanNameGenerator != null) {//注册组件 context.getBeanFactory().registerSingleton(AnnotationConfigUtils.CONFIGURATION_BEAN_NAME_GENERATOR, this.beanNameGenerator); } if (this.resourceLoader != null) { //读取配置文件的资源 if (context instanceof GenericApplicationContext) { ((GenericApplicationContext) context).setResourceLoader(this.resourceLoader); } if (context instanceof DefaultResourceLoader) { //资源加载器 ((DefaultResourceLoader) context).setClassLoader(this.resourceLoader.getClassLoader()); } } //筹备类型转换器 if (this.addConversionService) { context.getBeanFactory().setConversionService(ApplicationConversionService.getSharedInstance()); } }===================applyInitializers(context)protected void applyInitializers(ConfigurableApplicationContext context) {//遍历所有的 ApplicationContextInitializer。调用 initialize。来对ioc容器进行初始化扩大性能 for (ApplicationContextInitializer initializer : getInitializers()) { //之前从spring.factories找进去的七个Initializer Class<?> requiredType = GenericTypeResolver.resolveTypeArgument(initializer.getClass(), ApplicationContextInitializer.class); Assert.isInstanceOf(requiredType, context, "Unable to call initializer."); initializer.initialize(context); } }@Override public void initialize(ConfigurableApplicationContext context) { ConfigurableEnvironment environment = context.getEnvironment(); List<Class<?>> initializerClasses = getInitializerClasses(environment); //如果initializerClasses不为空，就把他们实例化。 if (!initializerClasses.isEmpty()) { applyInitializerClasses(context, initializerClasses); } }![上传中...]()