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从org.springframework.context.support.AbstractApplicationContext#refresh方法开发,进入到实例化所有的非懒加载的单实例Bean的finishBeanFactoryInitialization(beanFactory)的方法:
protected void finishBeanFactoryInitialization(ConfigurableListableBeanFactory beanFactory) { // 为Bean工厂设置类型转化器 if (beanFactory.containsBean(CONVERSION_SERVICE_BEAN_NAME) && beanFactory.isTypeMatch(CONVERSION_SERVICE_BEAN_NAME, ConversionService.class)) { beanFactory.setConversionService( beanFactory.getBean(CONVERSION_SERVICE_BEAN_NAME, ConversionService.class)); } // Register a default embedded value resolver if no bean post-processor // (such as a PropertyPlaceholderConfigurer bean) registered any before: // at this point, primarily for resolution in annotation attribute values. if (!beanFactory.hasEmbeddedValueResolver()) { beanFactory.addEmbeddedValueResolver(new StringValueResolver() { @Override public String resolveStringValue(String strVal) { return getEnvironment().resolvePlaceholders(strVal); } }); } // Initialize LoadTimeWeaverAware beans early to allow for registering their transformers early. String[] weaverAwareNames = beanFactory.getBeanNamesForType(LoadTimeWeaverAware.class, false, false); for (String weaverAwareName : weaverAwareNames) { getBean(weaverAwareName); } // Stop using the temporary ClassLoader for type matching. beanFactory.setTempClassLoader(null); //冻结所有的Bean定义 , 至此注册的Bean定义将不被修改或任何进一步的处理 beanFactory.freezeConfiguration(); //实例化剩下的单实例Bean beanFactory.preInstantiateSingletons(); }cs