在 AbstractApplicationContext refresh方法中会调用prepareBeanFactory方法进行容器的特殊属性处理
protected void prepareBeanFactory(ConfigurableListableBeanFactory beanFactory) { // Tell the internal bean factory to use the context's class loader etc. beanFactory.setBeanClassLoader(getClassLoader()); beanFactory.setBeanExpressionResolver(new StandardBeanExpressionResolver()); //注册默认属性编辑器 beanFactory.addPropertyEditorRegistrar(new ResourceEditorRegistrar(this)); ApplicationContextAwareProcessor实现了BeanPostProcessor接口对于bean实现了 EmbeddedValueResolverAware ,ResourceLoaderAware ,ApplicationEventPublisherAware ,MessageSourceAware ApplicationContextAware等接口就通过反射进行赋值。 beanFactory.addBeanPostProcessor(new ApplicationContextAwareProcessor(this)); 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. beanFactory.registerResolvableDependency(BeanFactory.class, beanFactory); beanFactory.registerResolvableDependency(ResourceLoader.class, this); beanFactory.registerResolvableDependency(ApplicationEventPublisher.class, this); beanFactory.registerResolvableDependency(ApplicationContext.class, this); // 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.containsBean(SYSTEM_PROPERTIES_BEAN_NAME)) { Map systemProperties; try { systemProperties = System.getProperties(); } catch (AccessControlException ex) { systemProperties = new ReadOnlySystemAttributesMap() { @Override protected String getSystemAttribute(String propertyName) { try { return System.getProperty(propertyName); } catch (AccessControlException ex) { if (logger.isInfoEnabled()) { logger.info("Not allowed to obtain system property [" + propertyName + "]: " + ex.getMessage()); } return null; } } }; } beanFactory.registerSingleton(SYSTEM_PROPERTIES_BEAN_NAME, systemProperties); }