参考源
《Spring源码深度解析(第2版)》
版本
本文章基于 Spring 5.3.15
Spring IOC 的核心是
其中一共有 13 个主要方法,这里分析第 3 个:AbstractApplicationContext
的refresh
方法。prepareBeanFactory
。
1 AbstractApplicationContext
1-1 对 BeanFactory 进行功能填充
prepareBeanFactory(beanFactory)
protected void prepareBeanFactory(ConfigurableListableBeanFactory beanFactory) { // 设置 beanFactory 的 classLoader 为当前 context 的 classLoader beanFactory.setBeanClassLoader(getClassLoader()); if (!shouldIgnoreSpel) { /** * 设置bean Factory 的表达式语言处理桥, Spring3 增加了表达式语言的支持 * 默认可以使用 #{bean.xxx} 的形式来调用相关属性值 */ beanFactory.setBeanExpressionResolver(new StandardBeanExpressionResolver(beanFactory.getBeanClassLoader())); } // 为 beanFactory 增加了一个默认的 propertyEditor,这个主要是对 bean 的属性等设置管理的一个工具 beanFactory.addPropertyEditorRegistrar(new ResourceEditorRegistrar(this, getEnvironment())); // 添加 Bean 增强器 beanFactory.addBeanPostProcessor(new ApplicationContextAwareProcessor(this)); // 设置忽略自动装配的接口 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.ignoreDependencyInterface(ApplicationStartupAware.class); // 设置自动装配的特殊规则 beanFactory.registerResolvableDependency(BeanFactory.class, beanFactory); beanFactory.registerResolvableDependency(ResourceLoader.class, this); beanFactory.registerResolvableDependency(ApplicationEventPublisher.class, this); beanFactory.registerResolvableDependency(ApplicationContext.class, this); // 添加 Bean 增强器 beanFactory.addBeanPostProcessor(new ApplicationListenerDetector(this)); // 增加对 AspectJ 的支持 if (!NativeDetector.inNativeImage() && beanFactory.containsBean(LOAD_TIME_WEAVER_BEAN_NAME)) { beanFactory.addBeanPostProcessor(new LoadTimeWeaverAwareProcessor(beanFactory)); // 为类型匹配设置临时类加载器 beanFactory.setTempClassLoader(new ContextTypeMatchClassLoader(beanFactory.getBeanClassLoader())); } // 添加默认的系统环境 bean if (!beanFactory.containsLocalBean(ENVIRONMENT_BEAN_NAME)) { beanFactory.registerSingleton(ENVIRONMENT_BEAN_NAME, getEnvironment()); } if (!beanFactory.containsLocalBean(SYSTEM_PROPERTIES_BEAN_NAME)) { beanFactory.registerSingleton(SYSTEM_PROPERTIES_BEAN_NAME, getEnvironment().getSystemProperties()); } if (!beanFactory.containsLocalBean(SYSTEM_ENVIRONMENT_BEAN_NAME)) { beanFactory.registerSingleton(SYSTEM_ENVIRONMENT_BEAN_NAME, getEnvironment().getSystemEnvironment()); } if (!beanFactory.containsLocalBean(APPLICATION_STARTUP_BEAN_NAME)) { beanFactory.registerSingleton(APPLICATION_STARTUP_BEAN_NAME, getApplicationStartup()); }}