prepareRefresh方法

从命名来看，就知道这个方法主要做了一些刷新前的准备工作，和主流程关系不大，主要是保存了容器的启动时间，启动标志等
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obtainFreshBeanFactory 方法

获取告诉子类初始化Bean工厂 就是把beanFactory取出来而已。DefaultListableBeanFactory XML模式下会在这里读取BeanDefinition
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AbstractRefreshableApplicationContext类	
	protected final void refreshBeanFactory() throws BeansException {
		if (hasBeanFactory()) {
			destroyBeans();
			closeBeanFactory();
		}
		try {
			DefaultListableBeanFactory beanFactory = createBeanFactory();
			beanFactory.setSerializationId(getId());
			customizeBeanFactory(beanFactory);
			loadBeanDefinitions(beanFactory);
			this.beanFactory = beanFactory;
		}
		catch (IOException ex) {
			throw new ApplicationContextException("I/O error parsing bean definition source for " + getDisplayName(), ex);
		}
	}
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prepareBeanFactory 方法

还是一些准备工作，添加了两个后置处理器:ApplicationContextAwareProcessor，ApplicationListenerDetector
还设置了 忽略自动装配 和 允许自动装配 的接口,如果不存在某个bean的时候，spring就自动注册singleton bean ,还设置了bean表达式解析器 等
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方法说明

	protected void prepareBeanFactory(ConfigurableListableBeanFactory beanFactory) {
		// Tell the internal bean factory to use the context's class loader etc.
		//APPCLassLoader
		beanFactory.setBeanClassLoader(getClassLoader());
		//bean解析处理器 StandardBeanExpressionResolver
		beanFactory.setBeanExpressionResolver(new StandardBeanExpressionResolver(beanFactory.getBeanClassLoader()));
		beanFactory.addPropertyEditorRegistrar(new ResourceEditorRegistrar(this, getEnvironment()));

		// Configure the bean factory with context callbacks.
		//添加一个ApplicationContextAwareProcessor 扩展了BeanPostProcessor
		beanFactory.addBeanPostProcessor(new ApplicationContextAwareProcessor(this));
		//忽略给定的自动装配依赖接口。
		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接口没有在普通工厂中注册为可解析类型。
		// MessageSource被注册为一个bean(用于自动装配)。
		//以下接口，允许自动装配,第一个参数是自动装配的类型，，第二个字段是自动装配的值

		beanFactory.registerResolvableDependency(BeanFactory.class, beanFactory);
		beanFactory.registerResolvableDependency(ResourceLoader.class, this);
		beanFactory.registerResolvableDependency(ApplicationEventPublisher.class, this);
		beanFactory.registerResolvableDependency(ApplicationContext.class, this);

		
    	//添加一个后置处理器：ApplicationListenerDetector，此后置处理器实现了BeanPostProcessor接口  用于检测内部bean的早期后处理器注册为applicationlistener
		beanFactory.addBeanPostProcessor(new ApplicationListenerDetector(this));

      //如果没有注册过bean名称为XXX，spring就自己创建一个名称为XXX的singleton bean
		// Detect a LoadTimeWeaver and prepare for weaving, if found.
		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.
		if (!beanFactory.containsLocalBean(ENVIRONMENT_BEAN_NAME)) { 
			//environment
			beanFactory.registerSingleton(ENVIRONMENT_BEAN_NAME, getEnvironment());
		}
		if (!beanFactory.containsLocalBean(SYSTEM_PROPERTIES_BEAN_NAME)) {
			//systemProperties
			beanFactory.registerSingleton(SYSTEM_PROPERTIES_BEAN_NAME, getEnvironment().getSystemProperties());
		}
		if (!beanFactory.containsLocalBean(SYSTEM_ENVIRONMENT_BEAN_NAME)) { 
			//systemEnvironment
			beanFactory.registerSingleton(SYSTEM_ENVIRONMENT_BEAN_NAME, getEnvironment().getSystemEnvironment());
		}
	}
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主要做了如下的操作：

1. 设置了一个类加载器
2. 设置了bean表达式解析器
3. 添加了属性编辑器的支持
4. 添加了一个后置处理器：ApplicationContextAwareProcessor，此后置处理器实现了BeanPostProcessor接口
5. 设置了一些忽略自动装配的接口
6. 设置了一些允许自动装配的接口，并且进行了赋值操作
7. 在容器中还没有XX的bean的时候，帮我们注册beanName为XX的singleton bean

postProcessBeanFactory 方法

//允许在上下文子类中对bean工厂进行后处理。
postProcessBeanFactory(beanFactory);

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