1.Bean 的实例化
public class AbstractAutowireCapableBeanFactory{
protected Object doCreateBean(**){
..
if (instanceWrapper == null) {
instanceWrapper = this.createBeanInstance(beanName, mbd, args);
}
..
}
}
2.Bean 的属性注入（DI）
public class AbstractAutowireCapableBeanFactory{
protected Object doCreateBean(**){
..
populateBean(beanName, mbd, instanceWrapper);
..
}
}
3.初始化
public class AbstractAutowireCapableBeanFactory{
protected Object doCreateBean(**){
..
exposedObject = initializeBean(beanName, exposedObject, mbd);
..
}
}
里面分了几步
private void invokeAwareMethods(String beanName, Object bean) {
if (bean instanceof Aware) {
if (bean instanceof BeanNameAware) {
((BeanNameAware) bean).setBeanName(beanName);
}
if (bean instanceof BeanClassLoaderAware) {
ClassLoader bcl = getBeanClassLoader();
if (bcl != null) {
((BeanClassLoaderAware) bean).setBeanClassLoader(bcl);
}
}
if (bean instanceof BeanFactoryAware) {
((BeanFactoryAware) bean).setBeanFactory(AbstractAutowireCapableBeanFactory.this);
}
}
}
if (mbd == null || !mbd.isSynthetic()) {
//---------------------------Bean生命周期一部分,调用postProcessAfterInitialization-----------------------
wrappedBean = applyBeanPostProcessorsAfterInitialization(wrappedBean, beanName);
}
1. 实现了BeanNameAware接口的话，Spring将Bean的Id传递给setBeanName()方法
2. 实现了BeanClassLoaderAware接口的话，Spring将getBeanClassLoader传给Bean
3. 如果Bean实现了BeanFactoryAware接口的话，Spring将调用setBeanFactory()方法，将BeanFactory容器实例传入
4. 如果Bean 实现了BeanPostProcessor接口，Spring就将调用他们的postProcessAfterInitialization()方法。
此时，Bean已经准备就绪，他们将一直驻留在应用上下文中，直到应用上下文被销毁。但是如果bean实现了DisposableBean接口，pring将调用它的destory()接口方法，同样，如果bean使用了destory-method 声明销毁方法，该方法也会被调用。
