spring加載配置文件，AbstractApplicationContext類中的refresh方法起著重要的作用。

@Overridepublic void refresh() throws BeansException, IllegalStateException {synchronized (this.startupShutdownMonitor) {// Prepare this context for refreshing.準備刷新context prepareRefresh();// Tell the subclass to refresh the internal bean factory.刷新子類beanFactory，注冊beanDefinitionConfigurableListableBeanFactory beanFactory = obtainFreshBeanFactory();// Prepare the bean factory for use in this context.準備beanfactory prepareBeanFactory(beanFactory);try {// Allows post-processing of the bean factory in context subclasses. postProcessBeanFactory(beanFactory);// Invoke factory processors registered as beans in the context. invokeBeanFactoryPostProcessors(beanFactory);// Register bean processors that intercept bean creation. registerBeanPostProcessors(beanFactory);// 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();// Instantiate all remaining (non-lazy-init) singletons.初始化非懶加載的bean實例 finishBeanFactoryInitialization(beanFactory);// Last step: publish corresponding event. finishRefresh();}catch (BeansException ex) {logger.warn("Exception encountered during context initialization - cancelling refresh attempt", ex);// Destroy already created singletons to avoid dangling resources. destroyBeans();// Reset 'active' flag. cancelRefresh(ex);// Propagate exception to caller.throw ex;}}}

實例化bean對象，主要的是在

finishBeanFactoryInitialization(beanFactory)

?方法。
大致的流程圖（下部分）：

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（點擊查看大圖）

下面分析實例化bean對象的源碼分析

加載bean對象：

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在AbstractBeanFactory類中，根據不同scope進行實例化，例如Singleton,Prototype等

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根據不同情況采用不同的代理方式：

到這里就是bean實例的初始化，可以看到spring采用的代理方式，來實現bean的初始化。

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轉載于:https://www.cnblogs.com/lzeffort/p/7669150.html

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