Spring源码分析总结(一)-IOC容器初始化_spring ioc初始化总结-优快云博客

本文链接：https://blog.youkuaiyun.com/Jacabe/article/details/79762983

本文详细介绍了IOC容器的初始化过程，包括BeanDefinition的Resource定位、载入和解析，以及BeanDefinition在IOC容器中的注册等三个阶段，并阐述了依赖注入的过程。

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一、IOC容器的初始化过程

IOC容器的初始化是由refresh()方法启动。经常使用的ApplicationContext 有:ClassPathXmlApplicationContext和FileSystemXmlApplicationContext、XmlWebApplicationContext等。都有refresh()方法。

refresh()方法的这个启动分为三个基本过程:

	/**
	 * Create a new ClassPathXmlApplicationContext with the given parent,
	 * loading the definitions from the given XML files.
	 * @param configLocations array of resource locations
	 * @param refresh whether to automatically refresh the context,
	 * loading all bean definitions and creating all singletons.
	 * Alternatively, call refresh manually after further configuring the context.
	 * @param parent the parent context
	 * @throws BeansException if context creation failed
	 * @see #refresh()
	 */
	public ClassPathXmlApplicationContext(
			String[] configLocations, boolean refresh, @Nullable ApplicationContext parent)
			throws BeansException {

		super(parent);
		setConfigLocations(configLocations);
		if (refresh) {
			refresh();
		}
	}

public abstract class AbstractApplicationContext extends DefaultResourceLoader
		implements ConfigurableApplicationContext {

@Override
	public void refresh() throws BeansException, IllegalStateException {
		synchronized (this.startupShutdownMonitor) {
			//准备刷新的上下文环境 Prepare this context for refreshing.
			prepareRefresh();

			//初始化BeanFactory,并进行xml文件读取 Tell the subclass to refresh the internal bean factory.
			ConfigurableListableBeanFactory beanFactory = obtainFreshBeanFactory();

			//对BeanFactory进行各种功能填充 Prepare the bean factory for use in this context.
			prepareBeanFactory(beanFactory);

			try {
				//子类覆盖方法做额外的处理Allows post-processing o