Spring源码 - 容器刷新#postProcessBeanFactory()

Spring源码 - 容器刷新#postProcessBeanFactory()

Spring版本：Spring 5.3.13-release

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# 1、postProcessBeanFactory()

AbstractApplicationContext#postProcessBeanFactory()代码：

	/**
	 * Modify the application context's internal bean factory after its standard
	 * initialization. All bean definitions will have been loaded, but no beans
	 * will have been instantiated yet. This allows for registering special
	 * BeanPostProcessors etc in certain ApplicationContext implementations.
	 * @param beanFactory the bean factory used by the application context
	 */
	protected void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) {
	}

可以看到，在AbstractApplicationContext#postProcessBeanFactory()中是没有做任何事情的，这是Spring预留给子类进行扩展使用的。模板方法设计模式。

而在SpringBoot中的AnnotationConfigServletWebServerApplicationContext#postProcessBeanFactory()是对这个方法进行了覆盖的：

	/**
	 * override AbstractApplicationContext's postProcessBeanFactory()
	 * template method in Spring IOC refresh()
	 *
	 * @param beanFactory ConfigurableListableBeanFactory
	 */
	@Override
	protected void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) {
		// 首先注册为 Web Application
		super.postProcessBeanFactory(beanFactory);
		// 扫描指定包下的 Bean 并将其进行注册
		if (this.basePackages != null && this.basePackages.length > 0) {
			this.scanner.scan(this.basePackages);
		}
		// 扫描指定注解的类下的 Bean 并将其注册
		if (!this.annotatedClasses.isEmpty()) {
			this.reader.register(ClassUtils.toClassArray(this.annotatedClasses));
		}
	}

我这里的Spring Boot源码版本为：2.6.2-release

GitHub源码地址：https://github.com/kapbc/kapcb-spring-source/tree/master/Spring-Framework-v5.3.13

备注：此文为笔者学习Spring源码的笔记，鉴于本人技术有限，文中难免出现一些错误，感谢大家批评指正。