{"rsdb":{"rid":"376023","subhead":"","postdate":"0","aid":"263387","fid":"54","uid":"1","topic":"1","content":"
spring\u4f5c\u4e3a\u76ee\u524d\u6211\u4eec\u5f00\u53d1\u7684\u57fa\u7840\u6846\u67b6,\u6bcf\u5929\u7684\u5f00\u53d1\u5de5\u4f5c\u57fa\u672c\u548c\u4ed6\u5f62\u5f71\u4e0d\u79bb,\u4f5c\u4e3a\u7ba1\u7406bean\u7684\u6700\u7ecf\u5178\u3001\u4f18\u79c0\u7684\u6846\u67b6\uff0c\u5b83\u7684\u590d\u6742\u7a0b\u5ea6\u5f80\u5f80\u4ee4\u4eba\u671b\u800c\u5374\u6b65\u3002\u4e0d\u8fc7\u4f5c\u4e3a\u671d\u5915\u76f8\u5904\u7684\u6846\u67b6\uff0c\u6211\u4eec\u5fc5\u987b\u5f97\u660e\u767d\u4e00\u4e2a\u95ee\u9898\u5c31\u662fspring\u662f\u5982\u4f55\u52a0\u8f7dbean\u7684\uff0c\u6211\u4eec\u5e38\u5728\u5f00\u53d1\u4e2d\u4f7f\u7528\u7684\u6ce8\u89e3\u6bd4\u5982@Component\u3001@AutoWired\u3001@Socpe\u7b49\u6ce8\u89e3\uff0cSpring\u662f\u5982\u4f55\u89e3\u6790\u7684\uff0c\u660e\u767d\u8fd9\u4e9b\u539f\u7406\u5c06\u6709\u52a9\u4e8e\u6211\u4eec\u66f4\u6df1\u523b\u7684\u7406\u89e3spring\u3002\u9700\u8981\u8bf4\u660e\u4e00\u70b9\u7684\u662fspring\u7684\u6e90\u7801\u975e\u5e38\u7cbe\u5bc6\u3001\u590d\u6742\uff0c\u9650\u4e8e\u7bc7\u5e45\u7684\u5173\u7cfb\uff0c\u672c\u7bc7\u535a\u5ba2\u4e0d\u4f1a\u7ec6\u81f4\u7684\u5206\u6790\u6e90\u7801\uff0c\u4f1a\u91c7\u53d6\u62bd\u4e1d\u5265\u8327\u7684\u65b9\u5f0f\uff0c\u907f\u8f7b\u5c31\u91cd\uff0c\u6293\u4f4f\u91cd\u70b9\u6765\u5206\u6790\u6574\u4e2a\u6d41\u7a0b(\u4e0d\u4f1a\u5206\u6790\u5177\u4f53\u7684\u7ec6\u8282)\uff0c\u672c\u6b21\u5c06\u4f1a\u57fa\u4e8espring5.0\u7684\u7248\u672c<\/p>
\u672c\u7bc7\u535a\u5ba2\u7684\u76ee\u5f55\uff1a<\/p>
\u4e00\uff1aspring\u8bfb\u53d6\u914d\u7f6e\u6216\u6ce8\u89e3\u7684\u8fc7\u7a0b<\/p>
\u4e8c\uff1aspring\u7684bean\u7684\u751f\u547d\u5468\u671f<\/p>
\u4e09\uff1aspring\u7684BeanPostProcessor\u5904\u7406\u5668<\/p>
\u56db\uff1a\u4e00\u4e9b\u5173\u952e\u6027\u7684\u95ee\u9898<\/p>
\u4e94\uff1a\u6d4b\u8bd5<\/p>
\u516d\uff1a\u603b\u7ed3<\/p>
\u4e00\uff1aspring\u8bfb\u53d6\u914d\u7f6e\u6216\u6ce8\u89e3\u7684\u8fc7\u7a0b<\/p>
1\uff1a\u5148\u901a\u8fc7\u626b\u63cf\u6307\u5b9a\u5305\u8def\u5f84\u4e0b\u7684spring\u6ce8\u89e3\uff0c\u6bd4\u5982@Component\u3001@Service\u3001@Lazy @Sope\u7b49spring\u8bc6\u522b\u7684\u6ce8\u89e3\u6216\u8005\u662fxml\u914d\u7f6e\u7684\u5c5e\u6027(\u901a\u8fc7\u8bfb\u53d6\u6d41,\u89e3\u6790\u6210Document\uff0cDocument)\u7136\u540espring\u4f1a\u89e3\u6790\u8fd9\u4e9b\u5c5e\u6027\uff0c\u5c06\u8fd9\u4e9b\u5c5e\u6027\u5c01\u88c5\u5230BeanDefintaion\u8fd9\u4e2a\u63a5\u53e3\u7684\u5b9e\u73b0\u7c7b\u4e2d.<\/p>
<\/p>
\u5728springboot\u4e2d\uff0c\u6211\u4eec\u4e5f\u53ef\u4ee5\u91c7\u7528\u6ce8\u89e3\u914d\u7f6e\u7684\u65b9\u5f0f\uff1a<\/p>
<\/p>
\u6bd4\u5982\u8fd9\u4e2a\u914d\u7f6eBean,spring\u4e5f\u4f1a\u5c06className\u3001scope\u3001lazy\u7b49\u8fd9\u4e9b\u5c5e\u6027\u88c5\u914d\u5230PersonAction\u5bf9\u5e94\u7684BeanDefintaion\u4e2d.\u5177\u4f53\u91c7\u7528\u7684\u662fBeanDefinitionParser\u63a5\u53e3\u4e2d\u7684parse(Element element, ParserContext parserContext)\u65b9\u6cd5,\u8be5\u63a5\u53e3\u6709\u5f88\u591a\u4e0d\u540c\u7684\u5b9e\u73b0\u7c7b\u3002\u901a\u8fc7\u5b9e\u73b0\u7c7b\u53bb\u89e3\u6790\u6ce8\u89e3\u6216\u8005xml\u7136\u540e\u653e\u5230BeanDefination\u4e2d,BeanDefintaion\u7684\u4f5c\u7528\u662f\u96c6\u6210\u4e86\u6211\u4eec\u7684\u914d\u7f6e\u5bf9\u8c61\u4e2d\u7684\u5404\u79cd\u5c5e\u6027\uff0c\u91cd\u8981\u7684\u6709\u8fd9\u4e2abean\u7684ClassName\uff0c\u8fd8\u6709\u662f\u5426\u662fSingleton\u3001\u5bf9\u8c61\u7684\u5c5e\u6027\u548c\u503c\u7b49\uff08\u5982\u679c\u662f\u5355\u4f8b\u7684\u8bdd\uff0c\u540e\u9762\u4f1a\u5c06\u8fd9\u4e2a\u5355\u4f8b\u5bf9\u8c61\u653e\u5165\u5230spring\u7684\u5355\u4f8b\u6c60\u4e2d\uff09\u3002spring\u540e\u671f\u5982\u679c\u9700\u8981\u8fd9\u4e9b\u5c5e\u6027\u5c31\u4f1a\u76f4\u63a5\u4ece\u5b83\u4e2d\u83b7\u53d6\u3002\u7136\u540e\uff0c\u518d\u6ce8\u518c\u5230\u4e00\u4e2aConcurrentHashMap\u4e2d\uff0c\u5728spring\u4e2d\u5177\u4f53\u7684\u65b9\u6cd5\u5c31\u662fregisterBeanDefinition()\uff0c\u8fd9\u4e2aMap\u5b58\u7684key\u662f\u5bf9\u8c61\u7684\u540d\u5b57\uff0c\u6bd4\u5982Person\u8fd9\u4e2a\u5bf9\u8c61\uff0c\u5b83\u7684\u540d\u5b57\u5c31\u662fperson,\u503c\u662fBeanDefination,\u5b83\u4f4d\u4e8eDefaultListableBeanFactory\u7c7b\u4e0b\u9762\u7684beanDefinitionMap\u7c7b\u5c5e\u6027\u4e2d\uff0c\u540c\u65f6\u5c06\u6240\u6709\u7684bean\u7684\u540d\u5b57\u653e\u5165\u5230beanDefinitionNames\u8fd9\u4e2alist\u4e2d,\u76ee\u7684\u5c31\u662f\u65b9\u4fbf\u53d6beanName;<\/p>
\u4e8c\uff1aspring\u7684bean\u7684\u751f\u547d\u5468\u671f<\/p>
spring\u7684bean\u751f\u547d\u5468\u671f\u5176\u5b9e\u6700\u6838\u5fc3\u7684\u5206\u4e3a4\u4e2a\u6b65\u9aa4\uff0c\u53ea\u8981\u7406\u6e05\u4e09\u4e2a\u5173\u952e\u7684\u6b65\u9aa4\uff0c\u5176\u4ed6\u7684\u53ea\u662f\u5728\u8fd9\u4e09\u4e2a\u7ec6\u8282\u4e2d\u6dfb\u52a0\u4e0d\u540c\u7684\u7ec6\u8282\u5b9e\u73b0,\u4e5f\u5c31\u662fspring\u7684bean\u751f\u660e\u5468\u671f\uff1a<\/p>
\u5b9e\u4f8b\u5316\u548c\u521d\u59cb\u5316\u7684\u533a\u522b\uff1a\u5b9e\u4f8b\u5316\u662f\u5728jvm\u7684\u5806\u4e2d\u521b\u5efa\u4e86\u8fd9\u4e2a\u5bf9\u8c61\u5b9e\u4f8b\uff0c\u6b64\u65f6\u5b83\u53ea\u662f\u4e00\u4e2a\u7a7a\u7684\u5bf9\u8c61\uff0c\u6240\u6709\u7684\u5c5e\u6027\u4e3anull\u3002\u800c\u521d\u59cb\u5316\u7684\u8fc7\u7a0b\u5c31\u662f\u8bb2\u5bf9\u8c61\u4f9d\u8d56\u7684\u4e00\u4e9b\u5c5e\u6027\u8fdb\u884c\u8d4b\u503c\u4e4b\u540e\uff0c\u8c03\u7528\u67d0\u4e9b\u65b9\u6cd5\u6765\u5f00\u542f\u4e00\u4e9b\u9ed8\u8ba4\u52a0\u8f7d\u3002\u6bd4\u5982spring\u4e2d\u914d\u7f6e\u7684\u6570\u636e\u5e93\u5c5e\u6027Bean\uff0c\u5728\u521d\u59cb\u5316\u7684\u65f6\u5019\u5c31\u4f1a\u5c06\u8fd9\u4e9b\u5c5e\u6027\u586b\u5145\uff0c\u6bd4\u5982driver\u3001jdbcurl\u7b49,\u7136\u540e\u521d\u59cb\u5316\u8fde\u63a5<\/p>
2.1\uff1a\u5b9e\u4f8b\u5316 Instantiation<\/p>
AbstractAutowireCapableBeanFactory.doCreateBean\u4e2d\u4f1a\u8c03\u7528createBeanInstance()\u65b9\u6cd5,\u8be5\u9636\u6bb5\u4e3b\u8981\u662f\u4ecebeanDefinitionMap\u5faa\u73af\u8bfb\u53d6bean,\u83b7\u53d6\u5b83\u7684\u5c5e\u6027\uff0c\u7136\u540e\u5229\u7528\u53cd\u5c04(core\u5305\u4e0b\u6709ReflectionUtil\u4f1a\u5148\u5f3a\u884c\u5c06\u6784\u9020\u65b9\u6cd5setAccessible(true))\u8bfb\u53d6\u5bf9\u8c61\u7684\u6784\u9020\u65b9\u6cd5(spring\u4f1a\u81ea\u52a8\u5224\u65ad\u662f\u5426\u662f\u6709\u53c2\u6570\u8fd8\u662f\u65e0\u53c2\u6570\uff0c\u4ee5\u53ca\u6784\u9020\u65b9\u6cd5\u4e2d\u7684\u53c2\u6570\u662f\u5426\u53ef\u7528),\u7136\u540e\u518d\u53bb\u521b\u5efa\u5b9e\u4f8b\uff08newInstance\uff09<\/p>
2.2\uff1a\u521d\u59cb\u5316<\/p>
\u521d\u59cb\u5316\u4e3b\u8981\u5305\u62ec\u4e24\u4e2a\u6b65\u9aa4,\u4e00\u4e2a\u662f\u5c5e\u6027\u586b\u5145\uff0c\u53e6\u4e00\u4e2a\u5c31\u662f\u5177\u4f53\u7684\u521d\u59cb\u5316\u8fc7\u7a0b<\/p>
2.2.1\uff1a\u5c5e\u6027\u8d4b\u503c PopulateBean()\u4f1a\u5bf9bean\u7684\u4f9d\u8d56\u5c5e\u6027\u8fdb\u884c\u586b\u5145\uff0c@AutoWired\u6ce8\u89e3\u6ce8\u5165\u7684\u5c5e\u6027\u5c31\u53d1\u751f\u8fd9\u4e2a\u9636\u6bb5\uff0c\u5047\u5982\u6211\u4eec\u7684bean\u6709\u5f88\u591a\u4f9d\u8d56\u7684\u5bf9\u8c61\uff0c\u90a3\u4e48spring\u4f1a\u4f9d\u6b21\u8c03\u7528\u8fd9\u4e9b\u4f9d\u8d56\u7684\u5bf9\u8c61\u8fdb\u884c\u5b9e\u4f8b\u5316\uff0c\u6ce8\u610f\u8fd9\u91cc\u53ef\u80fd\u4f1a\u6709\u5faa\u73af\u4f9d\u8d56\u7684\u95ee\u9898\u3002\u540e\u9762\u6211\u4eec\u4f1a\u8bb2\u5230spring\u662f\u5982\u4f55\u89e3\u51b3\u5faa\u73af\u4f9d\u8d56\u7684\u95ee\u9898<\/p>
2.2\uff1a\u521d\u59cb\u5316 Initialization<\/p>
\u521d\u59cb\u5316\u7684\u8fc7\u7a0b\u5305\u62ec\u5c06\u521d\u59cb\u5316\u597d\u7684bean\u653e\u5165\u5230spring\u7684\u7f13\u5b58\u4e2d\u3001\u586b\u5145\u6211\u4eec\u9884\u8bbe\u7684\u5c5e\u6027\u8fdb\u4e00\u6b65\u505a\u540e\u7f6e\u5904\u7406\u7b49
3: \u4f7f\u7528\u548c\u9500\u6bc1 Destruction<\/p>
\u5728Spring\u5c06\u6240\u6709\u7684bean\u90fd\u521d\u59cb\u5316\u597d\u4e4b\u540e\uff0c\u6211\u4eec\u7684\u4e1a\u52a1\u7cfb\u7edf\u5c31\u53ef\u4ee5\u8c03\u7528\u4e86\u3002\u800c\u9500\u6bc1\u4e3b\u8981\u7684\u64cd\u4f5c\u662f\u9500\u6bc1bean\uff0c\u4e3b\u8981\u662f\u4f34\u968f\u7740spring\u5bb9\u5668\u7684\u5173\u95ed\uff0c\u6b64\u65f6\u4f1a\u5c06spring\u7684bean\u79fb\u9664\u5bb9\u5668\u4e4b\u4e2d\u3002\u6b64\u540espring\u7684\u751f\u547d\u5468\u671f\u5230\u8fd9\u4e00\u6b65\u5f7b\u5e95\u7ed3\u675f\uff0c\u4e0d\u518d\u63a5\u53d7spring\u7684\u7ba1\u7406\u548c\u7ea6\u675f\u3002<\/p>
\u4e09\uff1aspring\u7684BeanPostProcessor\u5904\u7406\u5668<\/p>
spring\u7684\u53e6\u4e00\u4e2a\u5f3a\u5927\u4e4b\u5904\u5c31\u662f\u5141\u8bb8\u5f00\u53d1\u8005\u81ea\u5b9a\u4e49\u6269\u5c55bean\u7684\u521d\u59cb\u5316\u8fc7\u7a0b\uff0c\u6700\u4e3b\u8981\u7684\u5b9e\u73b0\u601d\u8def\u5c31\u662f\u901a\u8fc7BeanPostProcessor\u6765\u5b9e\u73b0\u7684,spring\u6709\u5404\u79cd\u524d\u7f6e\u548c\u540e\u7f6e\u5904\u7406\u5668\uff0c\u8fd9\u4e9b\u5904\u7406\u5668\u6e17\u900f\u5728bean\u521b\u5efa\u7684\u524d\u524d\u540e\u540e,\u7a7f\u63d2\u5728spring\u751f\u547d\u5468\u671f\u7684\u5404\u4e2a\u9636\u6bb5\uff0c\u6bcf\u4e00\u6b65\u90fd\u4f1a\u5f71\u54cd\u7740spring\u7684bean\u52a0\u8f7d\u8fc7\u7a0b\u3002\u63a5\u4e0b\u6765\u6211\u4eec\u5c31\u6765\u5206\u6790\u5177\u4f53\u7684\u8fc7\u7a0b\uff1a<\/p>
<\/p>
3.1:\u5b9e\u4f8b\u5316\u9636\u6bb5<\/p>
\u8be5\u9636\u6bb5\u4f1a\u8c03\u7528\u5bf9\u8c61\u7684\u7a7a\u6784\u9020\u65b9\u6cd5\u8fdb\u884c\u5bf9\u8c61\u7684\u5b9e\u4f8b\u5316\uff0c\u5728\u8fdb\u884c\u5b9e\u4f8b\u5316\u4e4b\u540e\uff0c\u4f1a\u8c03\u7528InstantiationAwareBeanPostProcessor\u7684postProcessBeforeInstantiation\u65b9\u6cd5<\/p>
BeanPostProcessor(\u5177\u4f53\u5b9e\u73b0\u662fInstantiationAwareBeanPostProcessor). postProcessBeforeInstantiation();<\/p>
\u8fd9\u4e2a\u9636\u6bb5\u5141\u8bb8\u5728Bena\u8fdb\u884c\u5b9e\u4f8b\u5316\u4e4b\u524d\uff0c\u5141\u8bb8\u5f00\u53d1\u8005\u81ea\u5b9a\u4e49\u903b\u8f91\uff0c\u5982\u8fd4\u56de\u4e00\u4e2a\u4ee3\u7406\u5bf9\u8c61\u3002\u4e0d\u8fc7\u9700\u8981\u6ce8\u610f\u7684\u662f\u5047\u5982\u5728\u8fd9\u4e2a\u9636\u6bb5\u8fd4\u56de\u4e86\u4e00\u4e2a\u4e0d\u4e3anull\u7684\u5b9e\u4f8b\uff0cspring\u5c31\u4f1a\u4e2d\u65ad\u540e\u7eed\u7684\u8fc7\u7a0b\u3002
BeanPostProcessor.postProcessAfterInstantiation();<\/p>
\u8fd9\u4e2a\u9636\u6bb5\u662fBean\u5b9e\u4f8b\u5316\u5b8c\u6bd5\u540e\u6267\u884c\u7684\u540e\u5904\u7406\u64cd\u4f5c\uff0c\u6240\u6709\u5728\u521d\u59cb\u5316\u903b\u8f91\u3001\u88c5\u914d\u903b\u8f91\u4e4b\u524d\u6267\u884c<\/p>
3.2:\u521d\u59cb\u5316\u9636\u6bb5<\/p>
3.2.1:BeanPostProcessor.postProcessBeforeInitialization<\/p>
\u8be5\u65b9\u6cd5\u5728bean\u521d\u59cb\u5316\u65b9\u6cd5\u524d\u88ab\u8c03\u7528\uff0cSpring AOP\u7684\u5e95\u5c42\u5904\u7406\u4e5f\u662f\u901a\u8fc7\u5b9e\u73b0BeanPostProcessor\u6765\u6267\u884c\u4ee3\u7406\u903b\u8f91\u7684<\/p>
3.2.2:InitializingBean.afterPropertiesSet<\/p>
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