spring实例化业务bean

1.在AbstractApplicationContext类的refresh()方法的543行，实例化所有的非懒加载的单例

  finishBeanFactoryInitialization(beanFactory);

2.finishBeanFactoryInitialization方法的867行beanFactory.preInstantiateSingletons();

3.DefaultListableBeanFactory类的preInstantiateSingletons方法的761行getBean(beanName);

4.AbstractBeanFactory类的197行doGetBean

5.AbstractBeanFactory.class的doGetBean方法的312行

    createBean(beanName, mbd, args);

6.AbstractAutowireCapableBeanFactory.class的createBean方法的483行

     Object beanInstance = doCreateBean(beanName, mbdToUse, args);

7.AbstractAutowireCapableBeanFactory.class的doCreateBean方法的513行

    instanceWrapper = createBeanInstance(beanName, mbd, args);

8.AbstractAutowireCapableBeanFactory.class的createBeanInstance方法的1107行

    return instantiateBean(beanName, mbd);

9.AbstractAutowireCapableBeanFactory.class的instantiateBean方法的1155行

   beanInstance = getInstantiationStrategy().instantiate(mbd, beanName, parent);

10.SimpleInstantiationStrategy.class的instantiate方法的89行

   return BeanUtils.instantiateClass(constructorToUse);

11.BeanUtils.class的instantiateClass方法的142行

   return ctor.newInstance(args);

12Constructor.class的newInstance()方法的423行

   T inst = (T) ca.newInstance(initargs);

总结:可以看出，实例化bean底层是使用的Java的反射机制