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: