prepareRefresh()
obtainFreshBeanFactory()
prepareBeanFactory(beanFactory)
postProcessBeanFactory(beanFactory)
invokeBeanFactoryPostProcessors(beanFactory)
registerBeanPostProcessors(beanFactory)
initMessageSource()
initApplicationEventMulticaster()
onRefresh()
registerListeners()
finishBeanFactoryInitialization(beanFactory)
finishRefresh()

// 設(shè)置啟動時間
this.startupDate = System.currentTimeMillis();
// 1交給子類實現(xiàn)，初始化屬性源
initPropertySources();
// 驗證所有標(biāo)記為必須的屬性
getEnvironment().validateRequiredProperties();

System.out.println("開始校驗自定義配置");
getEnvironment().setRequiredProperties("my-name");

// 刷新 BeanFactory
refreshBeanFactory();
// 獲取 getBeanFactory
return getBeanFactory();

//創(chuàng)建 beanFactory
DefaultListableBeanFactory beanFactory = createBeanFactory();
// 指定序列化 id
beanFactory.setSerializationId(getId());
// 定制 beanFactory，設(shè)置相關(guān)屬性，包括是否允許覆蓋同名稱的不同定義的對象以及循環(huán)依賴及設(shè)置 @Autowired 和 @Qualifier 注解解析器
customizeBeanFactory(beanFactory);
// 初始化 DocumentReader,并進行 XML 文件的讀取及解析，生成 BeanDefinition
loadBeanDefinitions(beanFactory);

// 設(shè)置 beanFactory 的類加載器
beanFactory.setBeanClassLoader(getClassLoader());
// 設(shè)置支持表達式解析器
beanFactory.setBeanExpressionResolver(new StandardBeanExpressionResolver(beanFactory.getBeanClassLoader()));
// 為 beanFactory 增加了一個默認的 propertyEditor ，這個主要是對 bean 的屬性等設(shè)置管理的一個工具
beanFactory.addPropertyEditorRegistrar(new ResourceEditorRegistrar(this, getEnvironment()));
// 添加部分BeanPostProcessor【ApplicationContextAwareProcessor】
beanFactory.addBeanPostProcessor(new ApplicationContextAwareProcessor(this));
//設(shè)置忽略的自動裝配的接口EnvironmentAware、EmbeddedValueResolverAware、xxx；
//這些接口的實現(xiàn)類不能通過類型來自動注入
beanFactory.ignoreDependencyInterface(EnvironmentAware.class);
beanFactory.ignoreDependencyInterface(EmbeddedValueResolverAware.class);
beanFactory.ignoreDependencyInterface(ResourceLoaderAware.class);
beanFactory.ignoreDependencyInterface(ApplicationEventPublisherAware.class);
beanFactory.ignoreDependencyInterface(MessageSourceAware.class);
beanFactory.ignoreDependencyInterface(ApplicationContextAware.class);
// 注冊可以解析的自動裝配；我們能直接在任何組件中自動注入
beanFactory.registerResolvableDependency(BeanFactory.class, beanFactory);
beanFactory.registerResolvableDependency(ResourceLoader.class, this);
beanFactory.registerResolvableDependency(ApplicationEventPublisher.class, this);
beanFactory.registerResolvableDependency(ApplicationContext.class, this);
// 增加對 AspectJ 的支持
if (beanFactory.containsBean(LOAD_TIME_WEAVER_BEAN_NAME)) {
?? ?beanFactory.addBeanPostProcessor(new LoadTimeWeaverAwareProcessor(beanFactory));
?? ?// Set a temporary ClassLoader for type matching.
?? ?beanFactory.setTempClassLoader(new ContextTypeMatchClassLoader(beanFactory.getBeanClassLoader()));
}
// 環(huán)境信息ConfigurableEnvironment
if (!beanFactory.containsLocalBean(ENVIRONMENT_BEAN_NAME)) {
?? ?beanFactory.registerSingleton(ENVIRONMENT_BEAN_NAME, getEnvironment());
}
// 系統(tǒng)屬性，systemProperties【Map<String, Object>】
if (!beanFactory.containsLocalBean(SYSTEM_PROPERTIES_BEAN_NAME)) {
?? ?beanFactory.registerSingleton(SYSTEM_PROPERTIES_BEAN_NAME, getEnvironment().getSystemProperties());
}
// 系統(tǒng)環(huán)境變量systemEnvironment【Map<String, Object>】
if (!beanFactory.containsLocalBean(SYSTEM_ENVIRONMENT_BEAN_NAME)) {
?? ?beanFactory.registerSingleton(SYSTEM_ENVIRONMENT_BEAN_NAME, getEnvironment().getSystemEnvironment());
}

// 執(zhí)行BeanFactoryPostProcessor的方法
PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(beanFactory, getBeanFactoryPostProcessors());

// 把這件事委托給 PostProcessorRegistrationDelegate 來處理
PostProcessorRegistrationDelegate.registerBeanPostProcessors(beanFactory, this);

// 1. 獲取所有的 Bean 后置處理器的名字
String[] postProcessorNames = beanFactory.getBeanNamesForType(BeanPostProcessor.class, true, false);
// 2. 對 Bean 后置處理器分類
List<BeanPostProcessor> priorityOrderedPostProcessors = new ArrayList<>();
List<BeanPostProcessor> internalPostProcessors = new ArrayList<>();
List<String> orderedPostProcessorNames = new ArrayList<>();
List<String> nonOrderedPostProcessorNames = new ArrayList<>();
// 3. 注冊 Bean 后置處理器
registerBeanPostProcessors(beanFactory, priorityOrderedPostProcessors);
registerBeanPostProcessors(beanFactory, orderedPostProcessors);
registerBeanPostProcessors(beanFactory, nonOrderedPostProcessors);
registerBeanPostProcessors(beanFactory, internalPostProcessors);
// 4. 注冊 ApplicationListener 探測器
beanFactory.addBeanPostProcessor(new ApplicationListenerDetector(applicationContext));

// 1. 添加指定的監(jiān)聽器
for (ApplicationListener<?> listener : getApplicationListeners()) {
?? ?getApplicationEventMulticaster().addApplicationListener(listener);
}
// 2. 獲取所有實現(xiàn) ApplicationListener 的廣播器,并添加
String[] listenerBeanNames = getBeanNamesForType(ApplicationListener.class, true, false);
for (String listenerBeanName : listenerBeanNames) {
?? ?getApplicationEventMulticaster().addApplicationListenerBean(listenerBeanName);
}

// 1. 凍結(jié)所有的 bean，已經(jīng)注冊的 bean 定義將不會被修改或任何進一步的處理
beanFactory.freezeConfiguration();
// 2. 實例化所有剩余的非懶加載的 bean
beanFactory.preInstantiateSingletons();

// 3.獲取容器中所有 beanDefinition 的名稱
List<String> beanNames = new ArrayList<>(this.beanDefinitionNames);
for (String beanName : beanNames) {
? ? // 根據(jù) beanName 獲取 BeanDefinition
?? ?RootBeanDefinition bd = getMergedLocalBeanDefinition(beanName);
?? ?// 不是抽象的 && 是單例的 && 不是懶加載的
?? ?if (!bd.isAbstract() && bd.isSingleton() && !bd.isLazyInit()) {
?? ??? ?if (isFactoryBean(beanName)) {
?? ??? ? ? ?// 如果是 FactoryBean，就先獲取 FactoryBean 實例
?? ??? ??? ?Object bean = getBean(FACTORY_BEAN_PREFIX + beanName);
?? ??? ??? ?if (bean instanceof FactoryBean) {
?? ??? ??? ??? ?…………
?? ??? ??? ?}
?? ??? ?}
?? ??? ?else {
?? ??? ? ? ?// 如果不是 FactoryBean,就直接獲取 Bean
?? ??? ??? ?getBean(beanName);
?? ??? ?}
?? ?}
}

// 清除上下文資源緩存（如掃描中的ASM元數(shù)據(jù)） scanning).
clearResourceCaches();
// 初始化上下文的生命周期處理器，并刷新（找出Spring容器中實現(xiàn)了Lifecycle接口的bean并執(zhí)行start()方法）
initLifecycleProcessor();
getLifecycleProcessor().onRefresh();
// 發(fā)布ContextRefreshedEvent事件告知對應(yīng)的ApplicationListener進行響應(yīng)的操作
publishEvent(new ContextRefreshedEvent(this));