springbean创建过程及执行顺序

1.如果框架里有实现BeanDefinitionRegistryPostProcessor的，最先执行2.BeanDefinitionRegistryPostProcessor.postProcessBeanDefinitionRegistry方法
比如 mybitis整合spring用到了

3.如果框架里有实现BeanFactoryPostProcessor的，最先执行BeanFactoryPostProcessor.postProcessBeanFactory方法
构造方法

4.set 设置属性

5.如果实现了Aware 执行Aware实现方法BeanNameAware.setBeanName -->BeanFactoryAware。setBeanFactory

6.如果框架里有实现BeanPostProcessor （所有bean创建都会执行）就执行BeanPostProcessor.postProcessBeforeInitialization

7.如果实现了InitializingBean接口就执行afterPropertiesSet

8.如果设置了initMethod 就执行此方法

9.如果框架里有实现BeanPostProcessor（所有bean创建都会执行）就执行BeanPostProcessor.postProcessAfterInitialization（和4对应）

springbean创建过程.png

spring启动过程分析
AbstractApplicationContext.refresh

public void refresh() throws BeansException, IllegalStateException {

synchronized (this.startupShutdownMonitor) {
            // Prepare this context for refreshing.
            prepareRefresh();

            // Tell the subclass to refresh the internal bean factory.
            ConfigurableListableBeanFactory beanFactory = obtainFreshBeanFactory();
                       
            // Prepare the bean factory for use in this context.
            prepareBeanFactory(beanFactory);

            try {
                              
                // Allows post-processing of the bean factory in context subclasses.
                postProcessBeanFactory(beanFactory);

                                 //此处会执行BeanFactoryPostProcessor
                // Invoke factory processors registered as beans in the context.
                invokeBeanFactoryPostProcessors(beanFactory);

                // Register bean processors that intercept bean creation.
                registerBeanPostProcessors(beanFactory);

                                //此处会执行BeanPostProcessor
                // Initialize message source for this context.
                initMessageSource();

                // Initialize event multicaster for this context.
                initApplicationEventMulticaster();

                // Initialize other special beans in specific context subclasses.
                onRefresh();

                // Check for listener beans and register them.
                registerListeners();

                // Instantiate all remaining (non-lazy-init) singletons.
                finishBeanFactoryInitialization(beanFactory);

                // Last step: publish corresponding event.
                finishRefresh();
            }
}