AbstractApplicationContext的refresh()方法简要说明
public void refresh() throws BeansException, IllegalStateException {synchronized (this.startupShutdownMonitor) {prepareRefresh();//准备启动spring容器，设置容器的启动日期和活动标志ConfigurableListableBeanFactory beanFactory = obtainFreshBeanFactory();//获得容器ApplicationContext的子类BeanFactory。步骤如下：如果已经有了BeanFactory就销毁它里面的单例Bean并关闭这个BeanFactory。2.创建一个新的BeanFactory。3.对这个BeanFactory进行定制（customize),如allowBeanDefinitionOverriding，allowCircularReferences。4.转载BeanDefinitions(读取配置文件，将xml转换成对应得BeanDefinition)。5.检查是否同时启动了两个BeanFactory。prepareBeanFactory(beanFactory);//配置BeanFactory（就是将ApplicationContext的一些属性配置到BeanFactory上吧）。这里做了很多事情，可以看看其源码，比较重要的如设置classLoader；将BeanPostProcess注册到BeanFactory里。try {// Allows post-processing of the bean factory in context subclasses.postProcessBeanFactory(beanFactory);invokeBeanFactoryPostProcessors(beanFactory);//触发BeanFactoryPostProcessorsregisterBeanPostProcessors(beanFactory);//触发BeanPostProcessors// Initialize message source for this context.initMessageSource();// Initialize event multicaster for this context.initApplicationEventMulticaster();// Initialize other special beans in specific context subclasses.onRefresh();// Check for listener beans and register them.registerListeners();finishBeanFactoryInitialization(beanFactory);//初始化单例的Bean，并将其保存起来。// Last step: publish corresponding event.finishRefresh();}catch (BeansException ex) {// Destroy already created singletons to avoid dangling resources.beanFactory.destroySingletons();// Reset 'active' flag.cancelRefresh(ex);// Propagate exception to caller.throw ex;}}}
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