{"id":1916,"date":"2023-06-19T18:07:57","date_gmt":"2023-06-19T10:07:57","guid":{"rendered":"https:\/\/xinchewhd.com.cn\/?p=1916"},"modified":"2023-06-19T18:07:57","modified_gmt":"2023-06-19T10:07:57","slug":"spring%e4%b8%adbean%e7%9a%84%e7%94%9f%e5%91%bd%e5%91%a8%e6%9c%9f","status":"publish","type":"post","link":"https:\/\/xinchewhd.com.cn\/index.php\/spring\/spring%e4%b8%adbean%e7%9a%84%e7%94%9f%e5%91%bd%e5%91%a8%e6%9c%9f\/","title":{"rendered":"Spring\u4e2dBean\u7684\u751f\u547d\u5468\u671f"},"content":{"rendered":"
\n

Spring Bean\u7684\u751f\u547d\u5468\u671f<\/span><\/h2>\n
\u6211\u4eec\u5728\u5177\u4f53\u804aSpring Bean\u7684\u751f\u547d\u5468\u671f\u4e4b\u524d\uff0c\u6211\u4eec\u5148\u804a\u4e00\u4e2a\u6982\u5ff5\uff1aSpring Bean\u7684\u4f5c\u7528\u57df\u3002\u5b83\u662f\u4ec0\u4e48\uff1f\u80fd\u88ab\u7528\u6765\u5e72\u561b\uff1f\u4e0d\u61c2\u5c31\u67e5\u3002<\/span><\/span><\/section>\n
\n
\n

Bean \u7684\u4f5c\u7528\u57df\u662f\u6307 Bean \u5728 Spring \u6574\u4e2a\u6846\u67b6\u4e2d\u7684\u67d0\u79cd\u884c\u4e3a\u6a21\u5f0f\u3002<\/span><\/p>\n

\u6bd4\u5982 singleton \u5355\u4f8b\u4f5c\u7528\u57df\uff0c\u5c31\u8868\u793a Bean \u5728\u6574\u4e2a Spring \u4e2d\u53ea\u6709\u4e00\u4efd\uff0c\u5b83\u662f\u5168\u5c40\u5171\u4eab\u7684\uff0c\u5f53\u6709\u4eba\u4fee\u6539\u4e86\u8fd9\u4e2a\u503c\u4e4b\u540e\uff0c\u90a3\u4e48\u53e6\u4e00\u4e2a\u4eba\u8bfb\u53d6\u5230\u7684\u5c31\u662f\u88ab\u4fee\u6539\u540e\u7684\u503c\u3002<\/span><\/p>\n<\/section>\n<\/blockquote>\n

Spring\u6846\u67b6\u652f\u6301\u4ee5\u4e0b\u4e94\u79cdBean\u7684\u4f5c\u7528\u57df\uff1a<\/span><\/p>\n

    \n
      \n
        \n
      • \n

        singleton<\/span><\/code> : \u552f\u4e00 bean \u5b9e\u4f8b\uff0cSpring \u4e2d\u7684 bean \u9ed8\u8ba4\u90fd\u662f\u5355\u4f8b\u7684\u3002<\/span><\/p>\n<\/li>\n

      • \n

        prototype<\/span><\/code> : \u6bcf\u6b21\u8bf7\u6c42\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684 bean \u5b9e\u4f8b\u3002<\/span><\/p>\n<\/li>\n

      • \n

        request<\/span><\/code> : \u6bcf\u4e00\u6b21 HTTP \u8bf7\u6c42\u90fd\u4f1a\u4ea7\u751f\u4e00\u4e2a\u65b0\u7684 bean\uff0c\u8be5 bean \u4ec5\u5728\u5f53\u524d HTTP request \u5185\u6709\u6548<\/span><\/p>\n<\/li>\n

      • \n


        <\/p>\n

        session<\/span><\/code> : \u6bcf\u4e00\u6b21 HTTP \u8bf7\u6c42\u90fd\u4f1a\u4ea7\u751f\u4e00\u4e2a\u65b0\u7684 bean\uff0c\u8be5 bean \u4ec5\u5728\u5f53\u524d HTTP session \u5185\u6709\u6548\u3002<\/span><\/p>\n<\/li>\n

      • \n

        global-session<\/span>\uff1a\u5728\u4e00\u4e2a\u5168\u5c40\u7684HTTP Session\u4e2d\uff0c\u4e00\u4e2abean\u5b9a\u4e49\u5bf9\u5e94\u4e00\u4e2a\u5b9e\u4f8b\u3002\u8be5\u4f5c\u7528\u57df\u4ec5\u5728\u57fa\u4e8eweb\u7684Spring ApplicationContext\u60c5\u5f62\u4e0b\u6709\u6548\u3002\u7f3a\u7701\u7684Spring bean \u7684\u4f5c\u7528\u57df\u662fSingleton\u3002<\/span><\/span><\/p>\n


        <\/p>\n<\/li>\n<\/ul>\n


        <\/p>\n<\/ul>\n<\/ul>\n

        \u800c\u6211\u4eec\u4eca\u5929\u8981\u804a\u7684Spring Bean\u7684\u751f\u547d\u5468\u671f\uff0c\u4e3b\u8981\u662f\u6307 <\/span>singleton bean\u3002<\/span><\/strong><\/span><\/section>\n
        \u90a3\u4ec0\u4e48\u662fSpring Bean\u7684\u751f\u547d\u5468\u671f\u5462\uff1f<\/strong><\/span><\/section>\n
        \u5bf9\u4e8e\u666e\u901a\u7684 Java \u5bf9\u8c61\uff0c\u5f53 new \u7684\u65f6\u5019\u521b\u5efa\u5bf9\u8c61\uff0c\u7136\u540e\u8be5\u5bf9\u8c61\u5c31\u80fd\u591f\u4f7f\u7528\u4e86\u3002\u4e00\u65e6\u8be5\u5bf9\u8c61\u4e0d\u518d\u88ab\u4f7f\u7528\uff0c\u5219\u7531 Java \u81ea\u52a8\u8fdb\u884c\u5783\u573e\u56de\u6536\u3002<\/span><\/section>\n
        \u90a3\u5b83\u7684\u751f\u547d\u5468\u671f\u5c31\u662f\uff1a\u5b9e\u4f8b\u5316\u3001\u4e0d\u88ab\u4f7f\u7528\u65f6\u88ab\u5783\u573e\u673a\u5236\u56de\u6536\u3002<\/span><\/section>\n

        \u800c Spring \u4e2d\u7684\u5bf9\u8c61\u662f bean\uff0cbean \u548c\u666e\u901a\u7684 Java \u5bf9\u8c61\u6ca1\u4ec0\u4e48\u533a\u522b\uff0c\u53ea\u4e0d\u8fc7 Spring \u4e0d\u518d\u81ea\u5df1\u53bb new \u5bf9\u8c61\u4e86\uff0c\u800c\u662f\u7531 IOC \u5bb9\u5668\u53bb\u5e2e\u52a9\u6211\u4eec\u5b9e\u4f8b\u5316\u5bf9\u8c61\u5e76\u4e14\u7ba1\u7406\u5b83\uff0c\u6211\u4eec\u9700\u8981\u54ea\u4e2a\u5bf9\u8c61\uff0c\u53bb\u95ee IOC \u5bb9\u5668\u8981\u5373\u53ef\uff0cSpring Bean \u7684\u751f\u547d\u5468\u671f\u5b8c\u5168\u7531\u5bb9\u5668\u63a7\u5236\u3002<\/span><\/p>\n

        \u5b83\u5206\u4e3a\u56db\u4e2a\u9636\u6bb5\uff1a<\/span><\/strong>\u5b9e\u4f8b\u5316 -> \u5c5e\u6027\u8d4b\u503c -> \u521d\u59cb\u5316 -> \u9500\u6bc1<\/span><\/strong><\/span><\/span><\/p>\n

            1\uff09\u5b9e\u4f8b\u5316 Instantiation<\/span>
        <\/span><\/span><\/section>\n
            2\uff09\u5c5e\u6027\u8d4b\u503c Populate<\/span>
        <\/span><\/span><\/section>\n
            3\uff09\u521d\u59cb\u5316 Initialization<\/span>
        <\/span><\/span><\/section>\n
            4\uff09\u9500\u6bc1 Destruction<\/span><\/span><\/span><\/section>\n
        \u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u7ed3\u5408\u6e90\u7801\u6765\u5bf9Bean\u7684\u751f\u547d\u5468\u671f\u8fd9\u4e2a\u8fc7\u7a0b\u8fdb\u884c\u63a2\u7a76\u3002<\/span><\/section>\n
        \n
          \n
        • <\/li>\n
        • <\/li>\n
        • <\/li>\n
        • <\/li>\n
        • <\/li>\n
        • <\/li>\n
        • <\/li>\n<\/ul>\n
          org.springframework.context.support.AbstractApplicationContext.refresh()<\/span><\/span><\/code>--> org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization \/\/ \u521d\u59cb\u5316bean\uff08\u5ef6\u8fdf\u52a0\u8f7d\u9664\u5916\uff09<\/span><\/span><\/code>--> org.springframework.beans.factory.config.ConfigurableListableBeanFactory.preInstantiateSingletons()<\/span><\/span><\/code>--> org.springframework.beans.factory.support.AbstractBeanFactory.getBean<\/span><\/span><\/code>--> org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean<\/span><\/span><\/code>--> org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean \/\/ \u521b\u5efa bean\uff08\u5b9e\u4f8b\u5316 bean\uff09<\/span><\/span><\/code>--> org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean<\/span><\/span><\/code><\/pre>\n<\/section>\n

          <\/section>\n
          Spring Bean\u7684\u521d\u59cb\u5316<\/span>\u662f\u5728Spring \u5bb9\u5668 refresh() \u65f6\u8fdb\u884c\u7684\uff0cSpring \u5bb9\u5668 refresh \u65f6\u4f1a\u8c03\u7528 finishBeanFactoryInitialization() \u6765\u521d\u59cb\u5316\u6240\u6709\u975e\u5ef6\u8fdf\u52a0\u8f7d\u7684 bean<\/span><\/span>\u3002<\/span>
          <\/span><\/section>\n
          \u6211\u4eec\u542f\u52a8\u672c\u5730\u9879\u76ee\uff0c\u5728\u4e0a\u8ff0\u5c42\u7ea7\u7ed3\u6784\u4e0a\u6253\u4e0a\u7aef\u70b9\uff0c\u7ed3\u5408\u6e90\u7801\uff0c\u6211\u4eec\u6765\u770b\u4e0bBean\u7684\u521b\u5efa\u8fc7\u7a0b\u3002<\/span><\/section>\n
          \u4f60\u4f1a\u53d1\u73b0\uff0c\u5728\u771f\u6b63createBean\u4e4b\u524d\uff0c\u8fd8\u6709\u4e00\u4e2a\u65b9\u6cd5doGetBean\uff0c\u5b83\u662f\u5e72\u561b\u7684\uff1f<\/span><\/section>\n
          \u6211\u4eec\u8fdb\u4e00\u6b65\u6df1\u5165\u5206\u6790\u770b\u4e0b\uff1a<\/span><\/section>\n
          1\u3001doGetBean<\/span> \u83b7\u53d6Bean<\/strong><\/span><\/section>\n

          <\/section>\n
          \u4ee5\u4e0adoGetBean\u65b9\u6cd5\u7b80\u5355\u7684\u6d41\u7a0b\u56fe\uff0c\u7ed3\u5408\u6e90\u7801\u5177\u4f53\u8bf4\u660e\u5982\u4e0b\uff1a<\/span><\/section>\n
          1\u3001\u83b7\u53d6\u771f\u6b63\u7684BeanName\uff1a\u65b9\u6cd5transformedBeanName()<\/strong><\/span><\/p>\n
            \n
              \n
              \u53c2\u6570 name\uff0c\u4e0d\u4e00\u5b9a\u662f beanName\uff0c\u53ef\u80fd\u662f aliasName\uff0c\u4e5f\u6709\u53ef\u80fd\u662f FactoryBean(\u5e26\u201c&\u201d\u524d\u7f00)\uff0c\u6240\u4ee5\u8fd9\u91cc\u9700\u8981\u8c03\u7528 transformedBeanName()\u65b9\u6cd5\u5bf9 name \u8fdb\u884c\u4e00\u756a\u8f6c\u6362\u3002<\/span><\/section>\n
                \n
              • \n
                \u53bb\u9664 FactoryBean \u7684\u4fee\u9970\u7b26\u3002\u5982\u679c name \u4ee5 \u201c&\u201d \u4e3a\u524d\u7f00\uff0c\u90a3\u4e48\u4f1a\u53bb\u6389\u8be5 \u201c&\u201d\uff0c\u4f8b\u5982\uff0cname = \"&amp;studentService\"\uff0c\u5219\u4f1a\u662f name = \"studentService<\/span><\/section>\n<\/li>\n
              • \n
                canonicalName\u65b9\u6cd5\uff1a\u53d6\u6307\u5b9a\u7684 alias \u6240\u8868\u793a\u7684\u6700\u7ec8 beanName\u3002<\/span><\/section>\n<\/li>\n<\/ul>\n

                <\/section>\n

                <\/section>\n<\/ul>\n<\/ul>\n
                       \u8fd9\u91cc\u5f15\u5165\u4e00\u4e2a\u6269\u5c55\u70b9\uff0cBean\u7684alias\u662f\u5982\u4f55\u751f\u6210\uff1fkey\u4e3a\u522b\u540d\u3001value\u662fbeanName<\/span>  \uff0c\u800cbeanName\u7684\u8bbe\u7f6e\uff0c\u6e90\u7801\u5982\u4e0b\uff1a <\/span><\/p>\n
                \u5982\u679c\u7c7bwhiteApple\u7684Bean \u5b58\u5728 \u522b\u540d\uff1awhiteApple3\u3001whiteApple2\u3001whiteApple1<\/span><\/span>
                <\/span><\/section>\n
                \u90a3\u4e48alias\u6700\u7ec8\u4f1a\u662f\uff1a{\"whiteApple3<\/span>\":\"whiteApple2<\/span>\"} {\"<\/span>whiteApple3<\/span>\":\"<\/span>whiteApple1<\/span>\"}<\/span><\/span><\/span><\/p>\n
                2\u3001\u83b7\u53d6\u7f13\u5b58\u4e2d\u7684\u5355\u4f8b\uff1a<\/span>getSingleton()<\/strong>
                <\/span><\/p>\n
                  \n
                    \n
                      \n
                    • \n
                      \u5982\u679c\u5728\u7f13\u5b58\u4e2d\u53ef\u4ee5\u5355\u4f8b\uff0c \u6709\u5219\u8fdb\u4e00\u6b65\u5224\u65ad\u8fd9\u4e2aBean\u662f\u4e0d\u662f\u5728\u521b\u5efa\u4e2d\uff0c\u5982\u679c\u662f\u7684\u5c31\u7b49\u5f85\u521b\u5efa\u5b8c\u6bd5\uff0c\u5426\u5219\u76f4\u63a5<\/span>\u8c03\u7528getObjectForBeanInstance<\/strong>()\u65b9\u6cd5\u8fd4\u56de<\/span><\/section>\n<\/li>\n
                    • \n
                      \u5982\u679c\u5728\u7f13\u5b58\u4e2d\u672a\u5b58\u5728\u5355\u4f8b\uff0c\u5219\u7ee7\u7eed\u4e0b\u4e00\u6b65<\/span><\/section>\n

                      <\/section>\n<\/li>\n<\/ul>\n<\/ul>\n<\/ul>\n
                      3\u3001isPrototypeCurrentlyInCreation<\/span><\/strong>\u65b9\u6cd5\uff1a\u5982\u679cscope\u662fprototype \u5e76\u4e14\u8fd8\u5728\u521b\u5efa\u4e2d\uff0c\u76f4\u63a5\u629b\u51fa\u5f02\u5e38<\/span><\/span><\/section>\n
                      4\u3001getParentBeanFactory<\/strong>() \u83b7\u53d6\u5f53\u524dBeanFactory\u7684parentBeanFactory<\/span><\/section>\n
                        \n
                          \n
                            \n
                          • \n
                            parentBeanFactory\u4e0d\u4e3a\u7a7a\uff0c\u5e76\u4e14containsBeanDefinition(beanName)<\/span> \u4e3afalse \u5219\u8c03\u7528parentBeanFactory.doGetBean \u8fd4\u56deBean<\/span><\/section>\n<\/li>\n
                          • \n
                            \u53cd\u4e4b \u7ee7\u7eed\u4e0b\u4e00\u6b65
                            <\/span><\/p>\n<\/li>\n<\/ul>\n<\/ul>\n<\/ul>\n
                            5\u3001<\/span>getMergedLocalBeanDefinition<\/span><\/strong>() \u5c06\u7236\u7c7b\u7684BeanDefinition\u4e0e\u5b50\u7c7b\u7684BeanDefinition\u8fdb\u884c\u5408\u5e76\u8986\u76d6<\/span><\/span>
                            <\/span><\/p>\n
                            6\u3001\u5982\u679cBean\u662f\u5355\u4f8b\uff08singleton\uff09\uff0c\u5219\u8c03\u7528createBean() <\/strong>\u521b\u5efabean<\/span><\/p>\n
                            \u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u7ee7\u7eed\u770b createBean\u3002<\/span>
                            <\/span><\/p>\n
                            2\u3001doCreateBean<\/span> \u521b\u5efaBean<\/strong><\/strong><\/strong><\/span><\/section>\n
                            \u4ee5\u4e0adoCreateBean\u65b9\u6cd5\u7b80\u5355\u7684\u6d41\u7a0b\u56fe\uff0c\u7ed3\u5408\u6e90\u7801\u5177\u4f53\u8bf4\u660e\u5982\u4e0b\uff1a<\/span><\/section>\n
                            1\u3001mbd.isSingleton() \u5224\u65ad\u662f\u5426\u662f\u5355\u4f8b\uff0c\u5982\u679c\u662f\uff0c\u5219\u9700\u8981\u5728\u7f13\u5b58factoryBeanInstanceCache \u4e2d\u628abeanName\u5bf9\u5e94\u7684\u6570\u636eremove\u6389\u3002<\/span><\/span><\/section>
                            2\u3001BeanWrapper\u4e3a\u7a7a\u7684\u60c5\u51b5\u4e0b \u8c03\u7528createBeanInstance\u521b\u5efabean\u5b9e\u4f8b\u3002<\/span><\/section>

                                <\/section>
                                • \u5982\u679c\u662f@Bean\u65b9\u5f0f\u58f0\u660ebean\u7684\u521b\u5efa\uff0c\u8be6\u89c1createBeanInstance \u2013 <\/span><\/span>instantiateUsingFactoryMethod <\/span>\u65b9\u6cd5\u3002<\/span><\/span><\/section><\/li>
                                • bean\u5982\u679c\u6ca1\u6709\u6709\u53c2\u6784\u9020\u5668\uff0c\u9ed8\u8ba4\u4f7f\u7528\u65e0\u53c2\u7684\u6784\u9020\u65b9\u6cd5\u53cd\u5c04\u521b\u5efa\u5b9e\u4f8b\uff0c\u8be6\u60c5\u89c1<\/span>createBeanInstance \u2013 instantiateBean<\/code><\/span><\/span>\u65b9\u6cd5\u3002<\/span><\/section><\/li>
                                  • \u9ed8\u8ba4\u4f7f\u7528\u65e0\u53c2\u7684\u6784\u9020\u65b9\u6cd5\uff1a<\/span>clazz.getDeclaredConstructor()<\/span><\/span><\/section><\/li>
                                  • \u901a\u8fc7\u53cd\u5c04\u8c03\u7528\u6784\u9020\u5668\u521b\u5efa\u5bf9\u8c61<\/span>\uff1a<\/span>BeanUtils.<\/span>instantiateClass<\/span>(constructorToUse) <\/span><\/span>\u5b9e\u4f8b\u5316\u5bf9\u8c61<\/span><\/span><\/section><\/li><\/ul>
                                  • bean\u5982\u679c\u6709\u552f\u4e00\u7684\u6709\u53c2\u6784\u9020\u5668\uff0c\u5e76\u4e14\u53c2\u6570\u80fd\u5728Spring\u5bb9\u5668\u4e2d\u627e\u5230\uff0c\u5219\u901a\u8fc7\u6709\u53c2\u6784\u9020\u5668\u53cd\u5c04\u3002\u8be6\u60c5\u89c1<\/span><\/span>createBeanInstance \u2013 autowireConstructor<\/code><\/span><\/span>\u65b9\u6cd5\u3002<\/span><\/section><\/li><\/ul>

                                    <\/p><\/ul><\/ul>
                                    3\u3001<\/span>applyMergedBeanDefinitionPostProcessors\uff1aBean\u540e\u7f6e\u5904\u7406\u5668<\/span><\/span><\/p>
                                        \u5728debug\u8fc7\u7a0b\u4e2d\uff0c\u6211\u4eec\u53d1\u73b0\u4e86\u4e09\u4e2a\u540e\u7f6e\u5904\u7406\u5668\uff0c\u90a3\u4ed6\u4eec\u5206\u522b\u90fd\u5e72\u4ec0\u4e48\u4e86\u5462\uff1f\u6ce8\u89e3\u626b\u63cf<\/span><\/span><\/section>
                                        • CommonAnnotationBeanPostProcessor\uff1a\u8d1f\u8d23@PostConstruct\u3001@PreDestroy<\/span><\/section><\/li>
                                        • AutowiredAnnotationBeanPostProcessor \uff1a@Autowired\u3001@Value<\/span><\/section><\/li>
                                        • ApplicationListenerDetector \u6682\u4e0d\u5206\u6790<\/span><\/section><\/li><\/ul>
                                          \u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/span><\/section>