【Spring源码】5.spring的bean工厂准备工作（prepareBeanFactory(beanFactory)）

【Spring源码系列- IOC】

本文目录

Debug进入prepareBeanFactory(beanFactory)

​部分函数详解（注释超详细有没有～另外提一嘴的其实就一个）

​带注解函数全文（体贴如我(o^^o)）～～

prepareBeanFactory(beanFactory)是refresh()函数中的第三个函数，想了解前两个函数：准备工作的prepareRefresh()和创建工厂(包含配置文件的解析工作)的obtainFreshBeanFactory()可以参考【Spring源码】3. xml文件如何转换成BeanDefinition(主要涉及prepareRefresh()+ obtainFreshBeanFactory()两个函数，图解向，堆图预警)_AQin1012的博客-CSDN博客一堆图预警～～～通过测试启动类进入ApplicationContext容器设置(解析)配置文件路径setConfigLocations(configLocations);参数configLocations格式是String[]​进入超级重要的refresh()方法1.准备工作：prepareRefresh()/** * Prepare this context for refreshing, setting its startup date andhttps://blog.csdn.net/aqin1012/article/details/124494175

Debug进入prepareBeanFactory(beanFactory)

完整prepareBeanFactory(ConfigurableListableBeanFactory beanFactory)函数源码（嘿嘿下面附带注解可复制版）

​部分函数详解（注释超详细有没有～另外提一嘴的其实就一个）

注意注意～addPropertyEditorRegistrar这个函数是可以进行属性编辑相关的扩展的，保姆级教程参考本系列下一篇文章

​带注解函数全文（体贴如我(o^^o)）～～

	/**
	 * Configure the factory's standard context characteristics,
	 * such as the context's ClassLoader and post-processors.
	 * @param beanFactory the BeanFactory to configure
	 */
	protected void prepareBeanFactory(ConfigurableListableBeanFactory beanFactory) {
		// Tell the internal bean factory to use the context's class loader etc.
		/** 设置BeanFactory的classloader为当前context的classloader */
		beanFactory.setBeanClassLoader(getClassLoader());
		/** 设置BeanFactory的表达式语言处理器 */
		beanFactory.setBeanExpressionResolver(new StandardBeanExpressionResolver(beanFactory.getBeanClassLoader()));
		/** 可扩展
		 *  为BeanFactory添加一个默认的propertyResolver（主要是bean属性设置管理的一个工具类）
		 * */
		beanFactory.addPropertyEditorRegistrar(new ResourceEditorRegistrar(this, getEnvironment()));

		// Configure the bean factory with context callbacks.
		/** 添加BeanPostProcessor */
		beanFactory.addBeanPostProcessor(new ApplicationContextAwareProcessor(this));
		/** 设置要忽略自动装配的接口（这些接口的实现是由容器通过set方法进行注入的）*/
		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 interface not registered as resolvable type in a plain factory.
		// MessageSource registered (and found for autowiring) as a bean.
		/** 设置几个自动匹配的特殊规则，当进行ioc初始化是如果有多个实现，那么就使用指定的对象进行注入 */
		beanFactory.registerResolvableDependency(BeanFactory.class, beanFactory);
		beanFactory.registerResolvableDependency(ResourceLoader.class, this);
		beanFactory.registerResolvableDependency(ApplicationEventPublisher.class, this);
		beanFactory.registerResolvableDependency(ApplicationContext.class, this);

		// Register early post-processor for detecting inner beans as ApplicationListeners.
		/** 注册BPP */
		beanFactory.addBeanPostProcessor(new ApplicationListenerDetector(this));

		/**
		 * 增加对AspectJ的支持（AspectJ提供了两种织入方式：编译期织入、类加载期织入（如下面的LOAD_TIME_WEAVER_BEAN_NAME））
		 * 在java中织入为三种方式：编译期织入、类加载期织入、运行期织入
		 * * 编译期织入 指在java编译期，采用特殊的编译器，将切面织入java类中
		 * * 类加载期织入 指通过特殊的类加载器，在类的字节码加载到JVM时，织入切面
		 * * 运行期织入 指通过cglib或者jdk动态代理在程序运行时进行切面织入
		 */
		// 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.
		/** 注册默认的系统环境bean到一级缓存中 */
		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());
		}
	}