Spring IOC类结构

Abstract class AbstractApplicationContext

+ refresh（）

InterfaceAliasRegistry

+ registerAlias

Class DefaultListableBeanFactory

+ beanDefinitionMap

InterfaceApplicationContext

+ 

Class AnnotationConfigApplicationContext

+ reader:AnnotatedBeanDefinitionReader+ scanner:ClassPathBeanDefinitionScanner

Class GenericApplicationContext

+ beanFactory: DefaultListableBeanFactory+ resourceLoader: ResourceLoader+ refreshed : AtomicBoolean

Interface[ ]

InterfaceBeanDefinitionRegistry

+ registerBeanDefinition+ getBeanDefinition

Abstract Class AbstractBeanFactory

+ mergedBeanDefinitions+ alreadyCreated

+ doGetBean()+ createBean()

Class DefaultSingletonBeanRegistry

+ singletonObjects+ singletonFactories

doGetBean方法1. beanName创建RootBeanDefinition2.如果是singleton，创建createBeanInstance3. addSingletonFactory方法把bean实例添加到单例工厂4. 从singletonFactory中取出该bean 对象放入singletonObjects

Class ClassPathBeanDefinitionScanner

+ registry:BeanDefinitionRegistry

Spring 启动，1. 先创建ApplicationContext的实现类。有XML配置方式，有Annotation配置方式。ClassPathResourceScanner等。2. ApplicationContext的实现类会去引用DefaultListableBeanFactory 的 registerBeanDefinition方法创建BeanDefinition并放入Map集合。3. 完成BeanDefinitionMap的封装后，会调用AbstractApplicationContext的refresh方法，这里会根据beanDefinitionMap创建bean示例。4. 单例非懒加载的bean会先放入singletonObjects中

Abstract Class AbstractAutowireCapableBeanFactory

+ createBean()+ doCreateBean+ createBeanInstance+ instantiateBean

Class AnnotatedBeanDefinitionReader

+ registerBean(Class annotatedClass)