Spring IOC
入口
AbstractApplicationContext
Object var1 = this.startupShutdownMonitor;
synchronized(this.startupShutdownMonitor) {
//刷新前的预处理操作
//初始化配置信息 及验证配置正确性
//初始化bean定义信息
//web环境情况初始化servletConfig 相关配置
th`在这里插入代码片`is.prepareRefresh();
//创建或者刷新beanFactory
ConfigurableListableBeanFactory beanFactory = this.obtainFreshBeanFactory();
//beanFactory 预处理阶段
//主要给beanFactory设置属性
this.prepareBeanFactory(beanFactory);
try {
//BeanFactory准备工作完成后进行的后置处理工作
//子类通过重写这个方法来在BeanFactory创建并预准备完成以后做进一步的设置
this.postProcessBeanFactory(beanFactory);
//执行BeanFactoryPostProcessor的方法；
//两个接口：BeanFactoryPostProcessor、BeanDefinitionRegistryPostProcessor
this.invokeBeanFactoryPostProcessors(beanFactory);
//注册BeanPostProcessor（Bean的后置处理器）【 intercept bean creation】
//不同的BeanPostProcessor 执行时机不一样
//详细见BeanPostProcessor笔记
this.registerBeanPostProcessors(beanFactory);
//初始化MessageSource组件（做国际化功能；消息绑定，消息解析）
this.initMessageSource();
//初始化事件派发器；事件广播使用
this.initApplicationEventMulticaster();
//留给子容器（子类）事件,重写可以实现自己逻辑
this.onRefresh();
//注册所有监听器
this.registerListeners();
//初始化所有剩下的单实例bean
this.finishBeanFactoryInitialization(beanFactory);
//完成BeanFactory的初始化创建工作；IOC容器就创建完成
//
this.finishRefresh();
} catch (BeansException var9) {
if (this.logger.isWarnEnabled()) {
this.logger.warn("Exception encountered during context initialization - cancelling refresh attempt: " + var9);
}
//创建失败销毁所有bean
this.destroyBeans();
this.cancelRefresh(var9);
throw var9;
} finally {
//重置各种缓存
this.resetCommonCaches();
}
}
详细
一、刷新前的预处理操作
this.prepareRefresh();
1、initPropertySources()
1. 初始化一些属性设置;子类自定义个性化的属性设置方法；
2. 获取 Environment 实例， 如果是 WEB 环境需要注入 ServletContext 和 servletConfig 数据源
3. 初始化bean定义信息
2、 this.getEnvironment().validateRequiredProperties();
1. 验证配置属性的合法性
2. this.earlyApplicationEvents = new LinkedHashSet(); 保存容器一些早期事件
二、获取BeanFactory
ConfigurableListableBeanFactory beanFactory = this.obtainFreshBeanFactory();
1、 this.refreshBeanFactory();
创建或刷新BeanFactory
创建了一个this.beanFactory = new DefaultListableBeanFactory();
设置beanFactory 的id
2、 getBeanFactory();返回刚才GenericApplicationContext创建的BeanFactory对象；
3、 将创建的BeanFactory【DefaultListableBeanFactory】返回；
三、BeanFactory属性预处理（设置一些属性）
this.prepareBeanFactory(beanFactory);
protected void prepareBeanFactory(ConfigurableListableBeanFactory beanFactory) {
// Tell the internal bean factory to use the context's class loader etc.
/**
* 设置上下文类加载器
*/
beanFactory.setBeanClassLoader(getClassLoader());
/**
* 添加bean表达式解释器，为了能够让我们的beanFactory去解析bean表达式
* 模板默认以前缀“#{”开头，以后缀“}”结尾
* 可以修改默认额前缀后缀
* 通过beanFactory.getBeanExpressionResolver()获得BeanExpressionResolver
* 然后resolver.setExpressionPrefix("%{");resolver.setExpressionSuffix("}");
*
* 那么什么时候用到这个解析器？
* 就是在Bean进行初始化后会有属性填充的一步,方法如下:
* protected void populateBean(String beanName, RootBeanDefinition mbd, BeanWrapper bw) {
* //属性填充
* applyPropertyValues(beanName, mbd, bw, pvs);
* }
* 最终会通过AbstractBeanFactory中的evaluateBeanDefinitionString方法进行解析
* 然后这时候就进到StandardBeanExpressionResolver中的evaluate方法中进行解析了
*/
beanFactory.setBeanExpressionResolver(new StandardBeanExpressionResolver(beanFactory.getBeanClassLoader()));
/**
* spring内部的属性编辑器
* 添加PropertyEditor属性编辑器（可以将我们的property动态设置为bean里面对应的属性类型）
* 比如：property赋值的是路径名(classpath/spring.xml)，而对应bean属性设置的是Resource，则有spring的ResourceEditor完成转换
* springframework-bean下的propertyEditors包下有很多spring自带的属性编辑器
* 其中刚才提到的ResourceEditor在springframework-core下的io包里面
*
* 可以自定义属性编辑器，通过实现PropertyEditorSupport接口，spring中自带的属性编辑器也是这么做的
* 使用ApplicationContext,只需要在配置文件中通过CustomEditorConfigurer注册即可。
* CustomEditorConfigurer实现了BeanFactoryPostProcessor接口，因而是一个Bean工厂后置处理器
* 在Spring容器中加载配置文件并生成BeanDefinition后会被执行。CustomEditorConfigurer在容器启动时有机会注册自定义的属性编辑器
*/
beanFactory.addPropertyEditorRegistrar(new ResourceEditorRegistrar(this, getEnvironment()));
// Configure the bean factory with context callbacks.
/**
* 添加一个处理器，主要设置 实现Aware接口的bean 获取对应Aware
* ApplicationContextAwareProcessor：能够在bean中获得各种*Aware
*/
beanFactory.addBeanPostProcessor(new ApplicationContextAwareProcessor(this));
/**
* 跳过以下6个属性的自动注入
* 因为在ApplicationContextAwareProcessor中已经完成了手动注入
*/
beanFactory.ignoreDependencyInterface(EnvironmentAware.class);
beanFactory.ignoreDependencyInterface(EmbeddedValueResolverAware.class);
beanFactory.ignoreDependencyInterface(ResourceLoaderAware.class);
beanFactory.ignoreDependencyInterface(ApplicationEventPublisherAware.class);
beanFactory.ignoreDependencyInterface(MessageSourceAware.class);
beanFactory.ignoreDependencyInterface(ApplicationContextAware.class);
// BeanFactory interface not registered as resolvable type in a plain factory.
// MessageSource registered (and found for autowiring) as a bean.
/**
* 注册几个自动装配相关的类和实例
* 在应用代码就可以通过类型自动装配把工厂实例和ApplicationContext实例设置到自定义bean的属性中
*
* 例如：这几个属性都会被自动设置，虽然没有在显示的在bean定义xml中注入它们
* private BeanFactory beanFactory;
* private ResourceLoader resourceLoader;
* private ApplicationEventPublisher appEventPublisher;
* private ApplicationContext appContext;
*/
beanFactory.registerResolvableDependency(BeanFactory.class, beanFactory);
beanFactory.registerResolvableDependency(ResourceLoader.class, this);
beanFactory.registerResolvableDependency(ApplicationEventPublisher.class, this);
beanFactory.registerResolvableDependency(ApplicationContext.class, this);
// Register early post-processor for detecting inner beans as ApplicationListeners.
/**
* 添加一个BPP（处理器），处理时间监听器
*/
beanFactory.addBeanPostProcessor(new ApplicationListenerDetector(this));
// Detect a LoadTimeWeaver and prepare for weaving, if found.
/**
增加对 AspectJ（动态代理） 的支持
* 当容器检查到定义了名称为loadTimeWeaver的bean时
* 会注册一个LoadTimeWeaverAwareProcessor到容器中
*
* 这个BPP（处理器）用来处理LoadTimeWeaverAware接口的
* 把LTW实例设置到实现了LoadTimeWeaverAware接口的bean中
*/
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()));
}
// Register default environment beans.
/**
* 就是一些系统配置和系统环境信息
* 如果发现没有这些bean则spring自己注册
*/
if (!beanFactory.containsLocalBean(ENVIRONMENT_BEAN_NAME)) {
beanFactory.registerSingleton(ENVIRONMENT_BEAN_NAME, getEnvironment());
}
if (!beanFactory.containsLocalBean(SYSTEM_PROPERTIES_BEAN_NAME)) {
beanFactory.registerSingleton(SYSTEM_PROPERTIES_BEAN_NAME, getEnvironment().getSystemProperties());
}
if (!beanFactory.containsLocalBean(SYSTEM_ENVIRONMENT_BEAN_NAME)) {
beanFactory.registerSingleton(SYSTEM_ENVIRONMENT_BEAN_NAME, getEnvironment().getSystemEnvironment());
}
}
四、BeanFactory准备工作完成后进行的后置处理工作
postProcessBeanFactory(beanFactory)
1、子类通过重写这个方法来在BeanFactory创建并预准备完成以后做进一步的设置
五、执行BeanFactoryPostProcessor的方法
invokeBeanFactoryPostProcessors(beanFactory)
/**
* 在上下文中调用注册为bean的工厂处理器
*/
invokeBeanFactoryPostProcessors(beanFactory);
public static void invokeBeanFactoryPostProcessors(
ConfigurableListableBeanFactory beanFactory, List<BeanFactoryPostProcessor> beanFactoryPostProcessors) {
// Invoke BeanDefinitionRegistryPostProcessors first, if any.
Set<String> processedBeans = new HashSet<String>();
// 1.判断beanFactory是否为BeanDefinitionRegistry，beanFactory为DefaultListableBeanFactory,
// 而DefaultListableBeanFactory实现了BeanDefinitionRegistry接口，因此这边为true
if (beanFactory instanceof BeanDefinitionRegistry) {
BeanDefinitionRegistry registry = (BeanDefinitionRegistry) beanFactory;
// 用于存放普通的BeanFactoryPostProcessor
List<BeanFactoryPostProcessor> regularPostProcessors = new LinkedList<BeanFactoryPostProcessor>();
// 用于存放BeanDefinitionRegistryPostProcessor
List<BeanDefinitionRegistryPostProcessor> registryProcessors = new LinkedList<BeanDefinitionRegistryPostProcessor>();
// 2.首先处理入参中的beanFactoryPostProcessors
// 遍历所有的beanFactoryPostProcessors, 将BeanDefinitionRegistryPostProcessor和普通BeanFactoryPostProcessor区分开
for (BeanFactoryPostProcessor postProcessor : beanFactoryPostProcessors) {
if (postProcessor instanceof BeanDefinitionRegistryPostProcessor) {
// 2.1 如果是BeanDefinitionRegistryPostProcessor
BeanDefinitionRegistryPostProcessor registryProcessor =
(BeanDefinitionRegistryPostProcessor) postProcessor;
// 2.1.1 直接执行BeanDefinitionRegistryPostProcessor接口的postProcessBeanDefinitionRegistry方法
registryProcessor.postProcessBeanDefinitionRegistry(registry);
// 2.1.2 添加到registryProcessors(用于最后执行postProcessBeanFactory方法)
registryProcessors.add(registryProcessor);
} else {
// 2.2 否则，只是普通的BeanFactoryPostProcessor
// 2.2.1 添加到regularPostProcessors(用于最后执行postProcessBeanFactory方法)
regularPostProcessors.add(postProcessor);
}
}
// Do not initialize FactoryBeans here: We need to leave all regular beans
// uninitialized to let the bean factory post-processors apply to them!
// Separate between BeanDefinitionRegistryPostProcessors that implement
// PriorityOrdered, Ordered, and the rest.
// 用于保存本次要执行的BeanDefinitionRegistryPostProcessor
List<BeanDefinitionRegistryPostProcessor> currentRegistryProcessors = new ArrayList<BeanDefinitionRegistryPostProcessor>();
// First, invoke the BeanDefinitionRegistryPostProcessors that implement PriorityOrdered.
// 3.调用所有实现PriorityOrdered接口的BeanDefinitionRegistryPostProcessor实现类
// 3.1 找出所有实现BeanDefinitionRegistryPostProcessor接口的Bean的beanName
String[] postProcessorNames =
beanFactory.getBeanNamesForType(BeanDefinitionRegistryPostProcessor.class, true, false);
// 3.2 遍历postProcessorNames
for (String ppName : postProcessorNames) {
// 3.3 校验是否实现了PriorityOrdered接口
if (beanFactory.isTypeMatch(ppName, PriorityOrdered.class)) {
// 3.4 获取ppName对应的bean实例, 添加到currentRegistryProcessors中,
// beanFactory.getBean: 这边getBean方法会触发创建ppName对应的bean对象, 目前暂不深入解析
currentRegistryProcessors.add(beanFactory.getBean(ppName, BeanDefinitionRegistryPostProcessor.class));
// 3.5 将要被执行的加入processedBeans，避免后续重复执行
processedBeans.add(ppName);
}
}
// 3.6 进行排序(根据是否实现PriorityOrdered、Ordered接口和order值来排序)
sortPostProcessors(currentRegistryProcessors, beanFactory);
// 3.7 添加到registryProcessors(用于最后执行postProcessBeanFactory方法)
registryProcessors.addAll(currentRegistryProcessors);
// 3.8 遍历currentRegistryProcessors, 执行postProcessBeanDefinitionRegistry方法
invokeBeanDefinitionRegistryPostProcessors(currentRegistryProcessors, registry);
// 3.9 执行完毕后, 清空currentRegistryProcessors
currentRegistryProcessors.clear();
// Next, invoke the BeanDefinitionRegistryPostProcessors that implement Ordered.
// 4.调用所有实现了Ordered接口的BeanDefinitionRegistryPostProcessor实现类（过程跟上面的步骤3基本一样）
// 4.1 找出所有实现BeanDefinitionRegistryPostProcessor接口的类, 这边重复查找是因为执行完上面的BeanDefinitionRegistryPostProcessor,
// 可能会新增了其他的BeanDefinitionRegistryPostProcessor, 因此需要重新查找
postProcessorNames = beanFactory.getBeanNamesForType(BeanDefinitionRegistryPostProcessor.class, true, false);
for (String ppName : postProcessorNames) {
// 校验是否实现了Ordered接口，并且还未执行过
if (!processedBeans.contains(ppName) && beanFactory.isTypeMatch(ppName, Ordered.class)) {
currentRegistryProcessors.add(beanFactory.getBean(ppName, BeanDefinitionRegistryPostProcessor.class));
processedBeans.add(ppName);
}
}
sortPostProcessors(currentRegistryProcessors, beanFactory);
registryProcessors.addAll(currentRegistryProcessors);
// 4.2 遍历currentRegistryProcessors, 执行postProcessBeanDefinitionRegistry方法
invokeBeanDefinitionRegistryPostProcessors(currentRegistryProcessors, registry);
currentRegistryProcessors.clear();
// Finally, invoke all other BeanDefinitionRegistryPostProcessors until no further ones appear.
// 5.最后, 调用所有剩下的BeanDefinitionRegistryPostProcessors
boolean reiterate = true;
while (reiterate) {
reiterate = false;
// 5.1 找出所有实现BeanDefinitionRegistryPostProcessor接口的类
postProcessorNames = beanFactory.getBeanNamesForType(BeanDefinitionRegistryPostProcessor.class, true, false);
for (String ppName : postProcessorNames) {
// 5.2 跳过已经执行过的
if (!processedBeans.contains(ppName)) {
currentRegistryProcessors.add(beanFactory.getBean(ppName, BeanDefinitionRegistryPostProcessor.class));
processedBeans.add(ppName);
// 5.3 如果有BeanDefinitionRegistryPostProcessor被执行, 则有可能会产生新的BeanDefinitionRegistryPostProcessor,
// 因此这边将reiterate赋值为true, 代表需要再循环查找一次
reiterate = true;
}
}
sortPostProcessors(currentRegistryProcessors, beanFactory);
registryProcessors.addAll(currentRegistryProcessors);
// 5.4 遍历currentRegistryProcessors, 执行postProcessBeanDefinitionRegistry方法
invokeBeanDefinitionRegistryPostProcessors(currentRegistryProcessors, registry);
currentRegistryProcessors.clear();
}
// Now, invoke the postProcessBeanFactory callback of all processors handled so far.
// 6.调用所有BeanDefinitionRegistryPostProcessor的postProcessBeanFactory方法(BeanDefinitionRegistryPostProcessor继承自BeanFactoryPostProcessor)
invokeBeanFactoryPostProcessors(registryProcessors, beanFactory);
// 7.最后, 调用入参beanFactoryPostProcessors中的普通BeanFactoryPostProcessor的postProcessBeanFactory方法
invokeBeanFactoryPostProcessors(regularPostProcessors, beanFactory);
} else {
// Invoke factory processors registered with the context instance.
invokeBeanFactoryPostProcessors(beanFactoryPostProcessors, beanFactory);
}
// 到这里 , 入参beanFactoryPostProcessors和容器中的所有BeanDefinitionRegistryPostProcessor已经全部处理完毕,
// 下面开始处理容器中的所有BeanFactoryPostProcessor
// Do not initialize FactoryBeans here: We need to leave all regular beans
// uninitialized to let the bean factory post-processors apply to them!
// 8.找出所有实现BeanFactoryPostProcessor接口的类
String[] postProcessorNames =
beanFactory.getBeanNamesForType(BeanFactoryPostProcessor.class, true, false);
// Separate between BeanFactoryPostProcessors that implement PriorityOrdered,
// Ordered, and the rest.
// 用于存放实现了PriorityOrdered接口的BeanFactoryPostProcessor
List<BeanFactoryPostProcessor> priorityOrderedPostProcessors = new ArrayList<BeanFactoryPostProcessor>();
// 用于存放实现了Ordered接口的BeanFactoryPostProcessor的beanName
List<String> orderedPostProcessorNames = new ArrayList<String>();
// 用于存放普通BeanFactoryPostProcessor的beanName
List<String> nonOrderedPostProcessorNames = new ArrayList<String>();
// 8.1 遍历postProcessorNames, 将BeanFactoryPostProcessor按实现PriorityOrdered、实现Ordered接口、普通三种区分开
for (String ppName : postProcessorNames) {
// 8.2 跳过已经执行过的
if (processedBeans.contains(ppName)) {
// skip - already processed in first phase above
} else if (beanFactory.isTypeMatch(ppName, PriorityOrdered.class)) {
// 8.3 添加实现了PriorityOrdered接口的BeanFactoryPostProcessor
priorityOrderedPostProcessors.add(beanFactory.getBean(ppName, BeanFactoryPostProcessor.class));
} else if (beanFactory.isTypeMatch(ppName, Ordered.class)) {
// 8.4 添加实现了Ordered接口的BeanFactoryPostProcessor的beanName
orderedPostProcessorNames.add(ppName);
} else {
// 8.5 添加剩下的普通BeanFactoryPostProcessor的beanName
nonOrderedPostProcessorNames.add(ppName);
}
}
// First, invoke the BeanFactoryPostProcessors that implement PriorityOrdered.
// 9.调用所有实现PriorityOrdered接口的BeanFactoryPostProcessor
// 9.1 对priorityOrderedPostProcessors排序
sortPostProcessors(priorityOrderedPostProcessors, beanFactory);
// 9.2 遍历priorityOrderedPostProcessors, 执行postProcessBeanFactory方法
invokeBeanFactoryPostProcessors(priorityOrderedPostProcessors, beanFactory);
// Next, invoke the BeanFactoryPostProcessors that implement Ordered.
// 10.调用所有实现Ordered接口的BeanFactoryPostProcessor
List<BeanFactoryPostProcessor> orderedPostProcessors = new ArrayList<BeanFactoryPostProcessor>();
for (String postProcessorName : orderedPostProcessorNames) {
// 10.1 获取postProcessorName对应的bean实例, 添加到orderedPostProcessors, 准备执行
orderedPostProcessors.add(beanFactory.getBean(postProcessorName, BeanFactoryPostProcessor.class));
}
// 10.2 对orderedPostProcessors排序
sortPostProcessors(orderedPostProcessors, beanFactory);
// 10.3 遍历orderedPostProcessors, 执行postProcessBeanFactory方法
invokeBeanFactoryPostProcessors(orderedPostProcessors, beanFactory);
// Finally, invoke all other BeanFactoryPostProcessors.
// 11.调用所有剩下的BeanFactoryPostProcessor
List<BeanFactoryPostProcessor> nonOrderedPostProcessors = new ArrayList<BeanFactoryPostProcessor>();
for (String postProcessorName : nonOrderedPostProcessorNames) {
// 11.1 获取postProcessorName对应的bean实例, 添加到nonOrderedPostProcessors, 准备执行
nonOrderedPostProcessors.add(beanFactory.getBean(postProcessorName, BeanFactoryPostProcessor.class));
}
// 11.2 遍历nonOrderedPostProcessors, 执行postProcessBeanFactory方法
invokeBeanFactoryPostProcessors(nonOrderedPostProcessors, beanFactory);
// Clear cached merged bean definitions since the post-processors might have
// modified the original metadata, e.g. replacing placeholders in values...
// 12.清除元数据缓存（mergedBeanDefinitions、allBeanNamesByType、singletonBeanNamesByType），
// 因为后处理器可能已经修改了原始元数据，例如， 替换值中的占位符...
beanFactory.clearMetadataCache();
```
### 六、注册BeanPostProcessor （Bean的后置处理器）【 intercept bean creation】详细见BeanPostProcessor笔记
### registerBeanPostProcessors(beanFactory)
```java
public static void registerBeanPostProcessors(
ConfigurableListableBeanFactory beanFactory, AbstractApplicationContext applicationContext) {
// 1.找出所有实现BeanPostProcessor接口的类
String[] postProcessorNames = beanFactory.getBeanNamesForType(BeanPostProcessor.class, true, false);
// Register BeanPostProcessorChecker that logs an info message when
// a bean is created during BeanPostProcessor instantiation, i.e. when
// a bean is not eligible for getting processed by all BeanPostProcessors.
// BeanPostProcessor的目标计数
int beanProcessorTargetCount = beanFactory.getBeanPostProcessorCount() + 1 + postProcessorNames.length;
// 2.添加BeanPostProcessorChecker(主要用于记录信息)到beanFactory中
beanFactory.addBeanPostProcessor(new BeanPostProcessorChecker(beanFactory, beanProcessorTargetCount));
// Separate between BeanPostProcessors that implement PriorityOrdered,
// Ordered, and the rest.
// 3.定义不同的变量用于区分: 实现PriorityOrdered接口的BeanPostProcessor、实现Ordered接口的BeanPostProcessor、普通BeanPostProcessor
// 3.1 priorityOrderedPostProcessors: 用于存放实现PriorityOrdered接口的BeanPostProcessor
List<BeanPostProcessor> priorityOrderedPostProcessors = new ArrayList<BeanPostProcessor>();
// 3.2 internalPostProcessors: 用于存放Spring内部的BeanPostProcessor
List<BeanPostProcessor> internalPostProcessors = new ArrayList<BeanPostProcessor>();
// 3.3 orderedPostProcessorNames: 用于存放实现Ordered接口的BeanPostProcessor的beanName
List<String> orderedPostProcessorNames = new ArrayList<String>();
// 3.4 nonOrderedPostProcessorNames: 用于存放普通BeanPostProcessor的beanName
List<String> nonOrderedPostProcessorNames = new ArrayList<String>();
// 4.遍历postProcessorNames, 将BeanPostProcessors按3.1 - 3.4定义的变量区分开
for (String ppName : postProcessorNames) {
if (beanFactory.isTypeMatch(ppName, PriorityOrdered.class)) {
// 4.1 如果ppName对应的Bean实例实现了PriorityOrdered接口, 则拿到ppName对应的Bean实例并添加到priorityOrderedPostProcessors
BeanPostProcessor pp = beanFactory.getBean(ppName, BeanPostProcessor.class);
priorityOrderedPostProcessors.add(pp);
if (pp instanceof MergedBeanDefinitionPostProcessor) {
// 4.2 如果ppName对应的Bean实例也实现了MergedBeanDefinitionPostProcessor接口,
// 则将ppName对应的Bean实例添加到internalPostProcessors
internalPostProcessors.add(pp);
}
}
else if (beanFactory.isTypeMatch(ppName, Ordered.class)) {
// 4.3 如果ppName对应的Bean实例没有实现PriorityOrdered接口, 但是实现了Ordered接口, 则将ppName添加到orderedPostProcessorNames
orderedPostProcessorNames.add(ppName);
}
else {
// 4.4 否则, 将ppName添加到nonOrderedPostProcessorNames
nonOrderedPostProcessorNames.add(ppName);
}
}
// First, register the BeanPostProcessors that implement PriorityOrdered.
// 5.首先, 注册实现PriorityOrdered接口的BeanPostProcessors
// 5.1 对priorityOrderedPostProcessors进行排序
sortPostProcessors(priorityOrderedPostProcessors, beanFactory);
// 5.2 注册priorityOrderedPostProcessors
registerBeanPostProcessors(beanFactory, priorityOrderedPostProcessors);
// Next, register the BeanPostProcessors that implement Ordered.
// 6.接下来, 注册实现Ordered接口的BeanPostProcessors
List<BeanPostProcessor> orderedPostProcessors = new ArrayList<BeanPostProcessor>();
for (String ppName : orderedPostProcessorNames) {
// 6.1 拿到ppName对应的BeanPostProcessor实例对象
BeanPostProcessor pp = beanFactory.getBean(ppName, BeanPostProcessor.class);
// 6.2 将ppName对应的BeanPostProcessor实例对象添加到orderedPostProcessors, 准备执行注册
orderedPostProcessors.add(pp);
if (pp instanceof MergedBeanDefinitionPostProcessor) {
// 6.3 如果ppName对应的Bean实例也实现了MergedBeanDefinitionPostProcessor接口,
// 则将ppName对应的Bean实例添加到internalPostProcessors
internalPostProcessors.add(pp);
}
}
// 6.4 对orderedPostProcessors进行排序
sortPostProcessors(orderedPostProcessors, beanFactory);
// 6.5 注册orderedPostProcessors
registerBeanPostProcessors(beanFactory, orderedPostProcessors);
// Now, register all regular BeanPostProcessors.
// 7.注册所有常规的BeanPostProcessors（过程与6类似）
List<BeanPostProcessor> nonOrderedPostProcessors = new ArrayList<BeanPostProcessor>();
for (String ppName : nonOrderedPostProcessorNames) {
BeanPostProcessor pp = beanFactory.getBean(ppName, BeanPostProcessor.class);
nonOrderedPostProcessors.add(pp);
if (pp instanceof MergedBeanDefinitionPostProcessor) {
internalPostProcessors.add(pp);
}
}
registerBeanPostProcessors(beanFactory, nonOrderedPostProcessors);
// Finally, re-register all internal BeanPostProcessors.
// 8.最后, 重新注册所有内部BeanPostProcessors（相当于内部的BeanPostProcessor会被移到处理器链的末尾）
// 8.1 对internalPostProcessors进行排序
sortPostProcessors(internalPostProcessors, beanFactory);
// 8.2注册internalPostProcessors
registerBeanPostProcessors(beanFactory, internalPostProcessors);
// Re-register post-processor for detecting inner beans as ApplicationListeners,
// moving it to the end of the processor chain (for picking up proxies etc).
// 9.重新注册ApplicationListenerDetector（跟8类似，主要是为了移动到处理器链的末尾）
beanFactory.addBeanPostProcessor(new ApplicationListenerDetector(applicationContext));
}
```
### 七、初始化MessageSource组件（做国际化功能；消息绑定，消息解析）
### initMessageSource()
> 如果想了解国际化可以[点击](https://blog.csdn.net/elim168/article/details/77891450)不是我写的
### 八、初始化事件派发器；事件广播使用
### initApplicationEventMulticaster()
> 事件的使用可以用来做消息发送日志记录等 自己百度用法
### 九、留给子容器（子类）事件
### onRefresh()
> 1、子类重写这个方法，在容器刷新的时候可以自定义逻辑；
### 十、给容器中将所有项目里面的ApplicationListener注册进来
### registerListeners()
> 系统事件 自定义事件等；
### 十一、初始化所有剩下的单实例bean
### finishBeanFactoryInitialization(beanFactory);
> 该方法会实例化所有剩余的非懒加载单例 bean。除了一些内部的 bean、实现了 BeanFactoryPostProcessor 接口的 bean、实现了 BeanPostProcessor 接口的 bean，其他的非懒加载单例 bean 都会在这个方法中被实例化，并且 BeanPostProcessor 的触发也是在这个方法中。
> 通过FactoryBean 反射创建在beanFactory 中定义的单例非懒加载单例 bean
具体可以跟下源码 实在写不动了