Spring原理---prepareBeanFactory()方法

在完成解析，把所有的BeanDenifition注册到bean工厂完成后，开始执行prepareBeanFactory方法,prepareBeanFactory代码很简单,直接看代码

prepareBeanFactory()方法

	protected void prepareBeanFactory(ConfigurableListableBeanFactory beanFactory) {
		//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，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()));
		//添加属性编辑器，更准确应该是属性转换器，比如从String到Date类型的 转化
		beanFactory.addPropertyEditorRegistrar(new ResourceEditorRegistrar(this, getEnvironment()));
 
		//添加后置处理器
		beanFactory.addBeanPostProcessor(new ApplicationContextAwareProcessor(this));
		//忽略自动装配
		beanFactory.ignoreDependencyInterface(EnvironmentAware.class);
		beanFactory.ignoreDependencyInterface(EmbeddedValueResolverAware.class);
		beanFactory.ignoreDependencyInterface(ResourceLoaderAware.class);
		beanFactory.ignoreDependencyInterface(ApplicationEventPublisherAware.class);
		beanFactory.ignoreDependencyInterface(MessageSourceAware.class);
		beanFactory.ignoreDependencyInterface(ApplicationContextAware.class);
 
		//设置几个自动装配规则，例如如果是BeanFactory则注入beanFactory
		//如果是ResourceLoader，ApplicationEventPublisher，ApplicationContext注入当前对象
		beanFactory.registerResolvableDependency(BeanFactory.class, beanFactory);
		beanFactory.registerResolvableDependency(ResourceLoader.class, this);
		beanFactory.registerResolvableDependency(ApplicationEventPublisher.class, this);
		beanFactory.registerResolvableDependency(ApplicationContext.class, this);
 
		// 如果包含LoadTimeWeaver，（AspectJ支持）
		if (beanFactory.containsBean(LOAD_TIME_WEAVER_BEAN_NAME)) {
			//添加后置处理器
			beanFactory.addBeanPostProcessor(new LoadTimeWeaverAwareProcessor(beanFactory));
			// Set a temporary ClassLoader for type matching.
			beanFactory.setTempClassLoader(new ContextTypeMatchClassLoader(beanFactory.getBeanClassLoader()));
		}
 
		//这里个属性都是系统属性都是单独存在的并没有注入到容器中
		//这里把系统属性注入到容器中
		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());
		}
	}

总结

prepareBeanFactory主要是配置标准的beanFactory,设置ClassLoader,设置SpEL表达式解析器,添加忽略注入的接口,添加bean,添加bean后置处理器等