Spring源码学习笔记

?最近在看spring的源码，担心忘掉了，打个记号，也请大家一起指正其中的错误，防止走歪路。

从xml配置文件加载入手

xml配置文件加载由

org.springframework.context.support.ClassPathXmlApplicationContext完成,该类的继承关系如下：

?实际调用：

AbstractApplicationContext context = new ClassPathXmlApplicationContext(new String[]{"beans.xml"});PersonService service = (PersonService)context.getBean("personService");

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?Beans.xml加载在创建ClassPathXmlApplicationContext实例时完成，上面调用方法仅仅是ClassPathXmlApplicationContext构造函数之一。

? 该构造函数调用具体内部步骤如下：

DefaultListableBeanFactory beanFactory = createBeanFactory();customizeBeanFactory(beanFactory);

加载bean定义的xml文件

protected void loadBeanDefinitions(DefaultListableBeanFactory beanFactory) throws IOException {// Create a new XmlBeanDefinitionReader for the given BeanFactory.XmlBeanDefinitionReader beanDefinitionReader = new XmlBeanDefinitionReader(beanFactory);// Configure the bean definition reader with this context's// resource loading environment.beanDefinitionReader.setResourceLoader(this);beanDefinitionReader.setEntityResolver(new ResourceEntityResolver(this));// Allow a subclass to provide custom initialization of the reader,// then proceed with actually loading the bean definitions.initBeanDefinitionReader(beanDefinitionReader);loadBeanDefinitions(beanDefinitionReader);}

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