spring bean的初始化过程

在org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory类的方法initializeBean里进行了bean的初始化操作(spring使用4.3.23版本)

protected Object initializeBean(final String beanName, final Object bean, RootBeanDefinition mbd) {
        if (System.getSecurityManager() != null) {
            AccessController.doPrivileged(new PrivilegedAction<Object>() {
                @Override
                public Object run() {
                    invokeAwareMethods(beanName, bean);
                    return null;
                }
            }, getAccessControlContext());
        }
        else {
            invokeAwareMethods(beanName, bean);
        }

        Object wrappedBean = bean;
        if (mbd == null || !mbd.isSynthetic()) {
            wrappedBean = applyBeanPostProcessorsBeforeInitialization(wrappedBean, beanName);
        }

        try {
            invokeInitMethods(beanName, wrappedBean, mbd);
        }
        catch (Throwable ex) {
            throw new BeanCreationException(
                    (mbd != null ? mbd.getResourceDescription() : null),
                    beanName, "Invocation of init method failed", ex);
        }
        if (mbd == null || !mbd.isSynthetic()) {
            wrappedBean = applyBeanPostProcessorsAfterInitialization(wrappedBean, beanName);
        }
        return wrappedBean;
    }

    private void invokeAwareMethods(final String beanName, final Object bean) {
        if (bean instanceof Aware) {
            if (bean instanceof BeanNameAware) {
                ((BeanNameAware) bean).setBeanName(beanName);
            }
            if (bean instanceof BeanClassLoaderAware) {
                ((BeanClassLoaderAware) bean).setBeanClassLoader(getBeanClassLoader());
            }
            if (bean instanceof BeanFactoryAware) {
                ((BeanFactoryAware) bean).setBeanFactory(AbstractAutowireCapableBeanFactory.this);
            }
        }
    }

对应的文字描述：
1）设置属性值；

2）调用Bean中的BeanNameAware.setBeanName()方法，如果该Bean实现了BeanNameAware接口；

3）调用Bean中的BeanFactoryAware.setBeanFactory()方法，如果该Bean实现了BeanFactoryAware接口；

4）调用BeanPostProcessors.postProcessBeforeInitialization()方法；

5）调用Bean中的afterPropertiesSet方法，如果该Bean实现了InitializingBean接口；

6）调用Bean中的init-method，通常是在配置bean的时候指定了init-method，例如：<bean class="beanClass" init-method="init"></bean>

7）调用BeanPostProcessors.postProcessAfterInitialization()方法；

8）如果该Bean是单例的，则当容器销毁并且该Bean实现了DisposableBean接口的时候，调用destory方法；如果该Bean是prototype，则将准备好的Bean提交给调用者，后续不再管理该Bean的生命周期。

对应的图片：

spring bean生命周期.png