面试题 ApplicationContext refresh 的流程

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1. prepareRefresh

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2. obtainFreshBeanFactroy

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3. prepareBeanfactory

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4. postProcessBeanFactory

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5. invokeBeanFactoryPostProcessors

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6. registerBeanPostProcessors

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7. initMessageSource

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8. initApplicationEventMulticaster

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9. onRefresh

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10. registerListeners

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11. finishBeanFactoryInitialization

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12. finishRefresh

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