{"id":1897,"date":"2019-07-08T07:59:25","date_gmt":"2019-07-07T23:59:25","guid":{"rendered":"https:\/\/coderbee.net\/?p=1897"},"modified":"2019-10-27T15:20:19","modified_gmt":"2019-10-27T07:20:19","slug":"springboot-%e5%90%af%e5%8a%a8%e5%88%86%e6%9e%90%e4%ba%94-%e4%b8%8a%e4%b8%8b%e6%96%87%e7%9a%84%e5%88%b7%e6%96%b0%e8%bf%87%e7%a8%8b","status":"publish","type":"post","link":"https:\/\/coderbee.net\/index.php\/framework\/20190708\/1897","title":{"rendered":"SpringBoot \u542f\u52a8\u5206\u6790(\u4e94) — \u4e0a\u4e0b\u6587\u7684\u5237\u65b0\u8fc7\u7a0b"},"content":{"rendered":"

1. SpringApplication.refreshContext<\/h1>\n

\u9996\u5148\u6765\u770b SpringApplication \u91cc\u5237\u65b0\u4e0a\u4e0b\u6587\u7684\u903b\u8f91\uff1a<\/p>\n

private void refreshContext(ConfigurableApplicationContext context) {\n    refresh(context);\n    if (this.registerShutdownHook) {\n        try {\n            context.registerShutdownHook();\n        } catch (AccessControlException ex) {\n            \/\/ Not allowed in some environments.\n        }\n    }\n}\n\nprotected void refresh(ApplicationContext applicationContext) {\n    Assert.isInstanceOf(AbstractApplicationContext.class, applicationContext);\n    ((AbstractApplicationContext) applicationContext).refresh();\n}\n<\/code><\/pre>\n
\u5237\u65b0\u7684\u903b\u8f91\u662f\u5728 AbstractApplicationContext.refresh<\/code> \u65b9\u6cd5\u5b8c\u6210\u7684\uff0c\u5237\u65b0\u5b8c\u540e\u6ce8\u518c\u4e86 JVM \u7684\u5173\u95ed\u56de\u8c03\u94a9\u5b50\u3002<\/p>\n
2. AbstractApplicationContext.refresh<\/h1>\n
<\/p>\n
public void refresh() throws BeansException, IllegalStateException {\n    synchronized (this.startupShutdownMonitor) {\n        \/\/ Prepare this context for refreshing.\n        prepareRefresh();\n\n        \/\/ \u8ba9\u5b50\u7c7b\u63d0\u4f9b\u8981\u5237\u65b0\u7684 BeanFactory\n        ConfigurableListableBeanFactory beanFactory = obtainFreshBeanFactory();\n\n        \/\/ Prepare the bean factory for use in this context.\n        prepareBeanFactory(beanFactory);\n\n        try {\n            \/\/ Allows post-processing of the bean factory in context subclasses.\n            postProcessBeanFactory(beanFactory);\n\n            \/\/ Invoke factory processors registered as beans in the context.\n            \/\/ \u6838\u5fc3\u903b\u8f91\uff1a\u8c03\u7528\u4e0a\u4e0b\u6587\u91cc\u4ee5Bean\u5f62\u5f0f\u6ce8\u518c\u7684\u6240\u6709 BeanFactoryPostProcessor\n            invokeBeanFactoryPostProcessors(beanFactory);\n\n            \/\/ Register bean processors that intercept bean creation.\n            \/\/ \u6838\u5fc3\u903b\u8f91\uff1a\u5411beanFactory\u6ce8\u518c BeanPostProcessor\uff0c\n            \/\/ \u7528\u4e8e\u5728\u521b\u5efa bean \u65f6\u56de\u8c03\uff0c\u4ee5\u589e\u5f3a bean\n            registerBeanPostProcessors(beanFactory);\n\n            \/\/ Initialize message source for this context.\n            \/\/ \u521d\u59cb\u5316 MessageSource\n            initMessageSource();\n\n            \/\/ Initialize event multicaster for this context.\n            initApplicationEventMulticaster();\n\n            \/\/ Initialize other special beans in specific context subclasses.\n            onRefresh();\n\n            \/\/ Check for listener beans and register them.\n            registerListeners();\n\n            \/\/ Instantiate all remaining (non-lazy-init) singletons.\n            \/\/ \u6838\u5fc3\u903b\u8f91\uff1a\u5b9e\u4f8b\u5316\u6240\u6709\u975e\u5ef6\u8fdf\u521d\u59cb\u5316\u7684\u5355\u4f8b\n            finishBeanFactoryInitialization(beanFactory);\n\n            \/\/ Last step: publish corresponding event.\n            finishRefresh();\n        }\n\n        catch (BeansException ex) {\n            if (logger.isWarnEnabled()) {\n                logger.warn(\"Exception encountered during context initialization - \" +\n                        \"cancelling refresh attempt: \" + ex);\n            }\n\n            \/\/ Destroy already created singletons to avoid dangling resources.\n            destroyBeans();\n\n            \/\/ Reset 'active' flag.\n            cancelRefresh(ex);\n\n            \/\/ Propagate exception to caller.\n            throw ex;\n        }\n\n        finally {\n            \/\/ Reset common introspection caches in Spring's core, since we\n            \/\/ might not ever need metadata for singleton beans anymore...\n            resetCommonCaches();\n        }\n    }\n}\n<\/code><\/pre>\n
\u4e0a\u4e0b\u6587\u5237\u65b0\u7684\u6838\u5fc3\u903b\u8f91\u5728\u4e8e\uff1a
\n1\u3001 \u8c03\u7528\u4e0a\u4e0b\u6587\u91cc\u4ee5 Bean \u5f62\u5f0f\u6ce8\u518c\u7684\u6240\u6709 BeanFactoryPostProcessor\u3002<\/p>\n
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\u5bf9\u4e8e AnnotationConfigEmbeddedWebApplicationContext<\/code> \u548c AnnotationConfigApplicationContext<\/code> \u4e0a\u4e0b\u6587\uff0c\u5b83\u4eec\u5728\u6784\u5efa\u7684\u65f6\u5019\u4f1a\u521b\u5efa AnnotatedBeanDefinitionReader<\/code>\uff0cAnnotatedBeanDefinitionReader<\/code>\u5728\u6784\u9020\u51fd\u6570\u91cc\u4f1a\u5f80\u4e0a\u4e0b\u6587\u91cc\u6ce8\u518c\u4e00\u4e9b\u57fa\u7840\u7ec4\u4ef6\uff0c\u5f88\u91cd\u8981\u7684\u4e00\u4e2a\u662fConfigurationClassPostProcessor<\/code>\uff0c\u4f1a\u5728\u8fd9\u91cc\u88ab\u8c03\u7528\uff0c\u7528\u4e8e\u89e3\u6790\u914d\u7f6e\u7c7b\u3001\u52a0\u8f7dbean\u5b9a\u4e49\u7b49\u3002\u5176\u4ed6\u7684\u5177\u4f53\u89c1 AnnotationConfigUtils.registerAnnotationConfigProcessors(BeanDefinitionRegistry registry, Object source)<\/code> \u65b9\u6cd5\u3002<\/p>\n<\/blockquote>\n
2\u3001 \u5411 beanFactory<\/code> \u6ce8\u518c BeanPostProcessor<\/code>\uff0c\u4ee5\u8fd9\u4e9b BeanPostProcessor<\/code> \u88ab\u5e94\u7528\u7684\u987a\u5e8f\u6ce8\u518c\u7684\uff1a<\/p>\n
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