简单的Spring的bean实例化过程

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先看起始点，载入先走AbstractBeanFactory

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进入AbstractBeanFactory中的protected Class resolveBeanClass方法：
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Object doCreateBean(final String beanName, final RootBeanDefinition mbd, final Object[] args) // Initialize the bean instance.Object exposedObject = bean;try {populateBean(beanName, mbd, instanceWrapper);if (exposedObject != null) {exposedObject = initializeBean(beanName, exposedObject, mbd);}}return exposedObject;//返回给AbstractBeanFactory
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