找入口
// Tell the subclass to refresh the internal bean factory.
// STEP 2:
// a) 创建IoC容器(DefaultListableBeanFactory)
// b) 加载解析XML文件(最终存储到Document对象中)
// c) 读取Document对象,并完成BeanDefinition的加载和注册工作
ConfigurableListableBeanFactory beanFactory = obtainFreshBeanFactory();
流程解析
-
进入AbstractApplication的
obtainFreshBeanFactory
方法:用于创建一个新的
IoC容器
,这个IoC容器
就是DefaultListableBeanFactory对象。
protected ConfigurableListableBeanFactory obtainFreshBeanFactory() {
// 主要是通过该方法完成IoC容器的刷新
refreshBeanFactory();
ConfigurableListableBeanFactory beanFactory = getBeanFactory();
if (logger.isDebugEnabled()) {
logger.debug("Bean factory for " + getDisplayName() + ": " + beanFactory);
}
return beanFactory;
}
- 进入AbstractRefreshableApplicationContext的
refreshBeanFactory
方法:- 销毁以前的容器
- 创建新的
IoC容器
- 加载
BeanDefinition
对象注册到IoC容器中
protected final void refreshBeanFactory() throws BeansException {
// 如果之前有IoC容器,则销毁
if (hasBeanFactory()) {
destroyBeans();
closeBeanFactory();
}
try {
// 创建IoC容器,也就是DefaultListableBeanFactory
DefaultListableBeanFactory beanFactory = createBeanFactory();
beanFactory.setSerializationId(getId());
customizeBeanFactory(beanFactory);
// 加载BeanDefinition对象,并注册到IoC容器中(重点)
loadBeanDefinitions(beanFactory);
synchronized (this.beanFactoryMonitor) {
this.beanFactory = beanFactory;
}
}
catch (IOException ex) {
throw new ApplicationContextException("I/O error parsing bean definition source for " + getDisplayName(), ex);
}
}
- 进入AbstractRefreshableApplicationContext的
createBeanFactory
方法
protected DefaultListableBeanFactory createBeanFactory() {
return new DefaultListableBeanFactory(getInternalParentBeanFactory());
}