{"id":1299,"date":"2025-08-14T21:02:39","date_gmt":"2025-08-14T13:02:39","guid":{"rendered":"http:\/\/www.cmd137blog.top\/?p=1299"},"modified":"2025-08-21T15:42:11","modified_gmt":"2025-08-21T07:42:11","slug":"mini-spring-%e4%bb%a3%e7%90%86%e7%af%87-aop%ef%bc%9astep-14%ef%bc%9a%e4%bd%bf%e7%94%a8%e6%b3%a8%e8%a7%a3%e5%ae%9e%e7%8e%b0%e9%85%8d%e7%bd%ae%e5%b1%9e%e6%80%a7%e5%92%8c-bean-%e5%af%b9%e8%b1%a1%e7%9a%84","status":"publish","type":"post","link":"http:\/\/www.cmd137blog.top\/?p=1299","title":{"rendered":"mini-Spring \u4ee3\u7406\u7bc7-AOP\uff1aStep 14\uff1a\u4f7f\u7528\u6ce8\u89e3\u5b9e\u73b0\u914d\u7f6e\u5c5e\u6027\u548c Bean \u5bf9\u8c61\u7684\u81ea\u52a8\u6ce8\u5165"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">\u5f15\u8a00<\/h2>\n\n\n\n<p>\u5728Spring\u6846\u67b6\u4e2d\uff0c\u4f9d\u8d56\u6ce8\u5165\uff08Dependency Injection\uff09\u662f\u6838\u5fc3\u673a\u5236\u4e4b\u4e00\uff0c\u7528\u4e8e\u7ba1\u7406Bean\u5bf9\u8c61\u7684\u521b\u5efa\u548c\u4f9d\u8d56\u5173\u7cfb\u3002\u4f20\u7edf\u65b9\u5f0f\u4f9d\u8d56XML\u914d\u7f6e\u6587\u4ef6\u624b\u52a8\u6307\u5b9a\u5c5e\u6027\u503c\u548cBean\u5f15\u7528\uff0c\u8fd9\u79cd\u65b9\u6cd5\u5728\u590d\u6742\u9879\u76ee\u4e2d\u5bb9\u6613\u5bfc\u81f4\u914d\u7f6e\u7e41\u7410\u548c\u7ef4\u62a4\u56f0\u96be\u3002\u4e3a\u7b80\u5316\u5f00\u53d1\u6d41\u7a0b\uff0c\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u7075\u6d3b\u6027\uff0cSpring\u5f15\u5165\u6ce8\u89e3-based\u6ce8\u5165\u673a\u5236\uff0c\u5982@Value\u7528\u4e8e\u6ce8\u5165\u914d\u7f6e\u503c\uff0c@Autowired\u7528\u4e8e\u6ce8\u5165Bean\u5bf9\u8c61\u3002<\/p>\n\n\n\n<p>\u672c\u7ae0\u805a\u7126\u4e8e\u5b9e\u73b0\u6ce8\u89e3\u6ce8\u5165\u914d\u7f6e\u503c\u548cBean\u5bf9\u8c61\u7684\u529f\u80fd\u3002\u5b9e\u73b0\u601d\u8def\u6e90\u4e8eBean\u751f\u547d\u5468\u671f\u7684\u6269\u5c55\u70b9\uff1aSpring\u7684BeanPostProcessor\u63a5\u53e3\u5141\u8bb8\u5728Bean\u5b9e\u4f8b\u5316\u540e\u3001\u5c5e\u6027\u586b\u5145\u524d\u4fee\u6539\u5c5e\u6027\u503c\u3002\u901a\u8fc7\u7ee7\u627fInstantiationAwareBeanPostProcessor\u63a5\u53e3\uff0c\u5e76\u5728postProcessPropertyValues\u65b9\u6cd5\u4e2d\u626b\u63cf\u6ce8\u89e3\uff0c\u53ef\u4ee5\u5728\u5c5e\u6027\u586b\u5145\u9636\u6bb5\u52a8\u6001\u6ce8\u5165\u503c\u3002\u8fd9\u79cd\u65b9\u6cd5\u907f\u514d\u4e86XML\u914d\u7f6e\u7684\u9759\u6001\u6027\uff0c\u5229\u7528\u53cd\u5c04\u548c\u6ce8\u89e3\u5143\u6570\u636e\u5b9e\u73b0\u81ea\u52a8\u5316\u6ce8\u5165\u3002<\/p>\n\n\n\n<p>\u5177\u4f53\u6b65\u9aa4\u5305\u62ec\uff1a<\/p>\n\n\n\n<p>\uff081\uff09\u5728BeanFactory\u4e2d\u6ce8\u518c\u5c5e\u6027\u89e3\u6790\u5668\u5904\u7406\u5360\u4f4d\u7b26\uff1b<\/p>\n\n\n\n<p>\uff082\uff09\u5b9a\u4e49\u81ea\u5b9a\u4e49\u6ce8\u89e3\uff1b<\/p>\n\n\n\n<p>\uff083\uff09\u521b\u5efa\u6ce8\u89e3\u5904\u7406\u5668\u626b\u63cf\u5e76\u6ce8\u5165\u5c5e\u6027\uff1b<\/p>\n\n\n\n<p>\uff084\uff09\u5728Bean\u521b\u5efa\u6d41\u7a0b\u4e2d\u8c03\u7528\u5904\u7406\u5668\uff0c\u786e\u4fdd\u6ce8\u5165\u53d1\u751f\u5728\u5c5e\u6027\u586b\u5145\u524d\u3002\u8be5\u8bbe\u8ba1\u786e\u4fdd\u517c\u5bb9\u73b0\u6709Bean\u751f\u547d\u5468\u671f\uff0c\u540c\u65f6\u63d0\u4f9b\u53ef\u6269\u5c55\u6027\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u76ee\u6807<\/h2>\n\n\n\n<p>\u5b9e\u73b0\u57fa\u4e8e\u6ce8\u89e3\u7684\u81ea\u52a8\u6ce8\u5165\u529f\u80fd\uff0c\u5305\u62ec\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528@Value\u6ce8\u89e3\u6ce8\u5165\u914d\u7f6e\u503c\uff08\u5982\u4ece\u5c5e\u6027\u6587\u4ef6\u8bfb\u53d6\u7684\u5360\u4f4d\u7b26\uff09\u3002<\/li>\n\n\n\n<li>\u4f7f\u7528@Autowired\u6ce8\u89e3\u6ce8\u5165Bean\u5bf9\u8c61\uff0c\u652f\u6301@Qualifier\u6307\u5b9aBean\u540d\u79f0\u3002 \u6b64\u529f\u80fd\u6784\u5efa\u4e8eIOC\u5bb9\u5668\u81ea\u52a8\u626b\u63cf@Component\u6ce8\u89e3\u7684\u57fa\u7840\u4e0a\uff0c\u53d6\u4ee3XML\u4e2d\u7684&lt;property>\u6807\u7b7e\u3002&lt;\/property><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u8bbe\u8ba1\u65b9\u6848<\/h2>\n\n\n\n<p>\u6ce8\u5165\u64cd\u4f5c\u96c6\u6210\u5230Bean\u751f\u547d\u5468\u671f\u7684\u5c5e\u6027\u586b\u5145\u9636\u6bb5\uff08applyPropertyValues\u524d\uff09\u3002\u6838\u5fc3\u7ec4\u4ef6\u5305\u62ec\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u5c5e\u6027\u89e3\u6790\u5668<\/strong>\uff1a\u4f7f\u7528BeanFactoryPostProcessor\uff08\u5982PropertyPlaceholderConfigurer\uff09\u52a0\u8f7d\u5c5e\u6027\u6587\u4ef6\uff0c\u5e76\u6ce8\u518cStringValueResolver\u5230BeanFactory\uff0c\u7528\u4e8e\u89e3\u6790@Value\u4e2d\u7684\u5360\u4f4d\u7b26\u3002<\/li>\n\n\n\n<li><strong>\u6ce8\u89e3\u5904\u7406\u5668<\/strong>\uff1a\u5b9e\u73b0InstantiationAwareBeanPostProcessor\u63a5\u53e3\uff0c\u5728postProcessPropertyValues\u65b9\u6cd5\u4e2d\u626b\u63cf\u5b57\u6bb5\u6ce8\u89e3\uff0c\u6ce8\u5165\u914d\u7f6e\u503c\u6216Bean\u5b9e\u4f8b\u3002<\/li>\n\n\n\n<li><strong>\u6ce8\u5165\u903b\u8f91<\/strong>\uff1a\n<ul class=\"wp-block-list\">\n<li>\u914d\u7f6e\u503c\uff1a\u4eceBeanFactory\u89e3\u6790\u5360\u4f4d\u7b26\uff08\u5982&#8221;${token}&#8221;\uff09\uff0c\u8bbe\u7f6e\u5230PropertyValues\u3002<\/li>\n\n\n\n<li>Bean\u5bf9\u8c61\uff1a\u901a\u8fc7BeanFactory.getBean\u83b7\u53d6\u5b9e\u4f8b\uff0c\u652f\u6301\u7c7b\u578b\u6216\u540d\u79f0\u5339\u914d\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u8be5\u65b9\u6848\u5229\u7528BeanPostProcessor\u7684\u6269\u5c55\u6027\uff0c\u786e\u4fdd\u6ce8\u5165\u4e0d\u5e72\u6270\u6838\u5fc3\u521b\u5efa\u6d41\u7a0b\u3002<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/bugstack.cn\/assets\/images\/spring\/spring-15-01.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/bugstack.cn\/assets\/images\/spring\/spring-15-01.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\"\/><\/div><\/figure>\n\n\n\n<h1 class=\"wp-block-heading\">\u7ed3\u6784\uff1a<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">1.\u5de5\u7a0b\u7ed3\u6784<br><\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>small-spring-step-14<br>\u2514\u2500\u2500 src<br>\u251c\u2500\u2500 main<br>\u2502 \u2514\u2500\u2500 java<br>\u2502 \u2514\u2500\u2500 cn.bugstack.springframework<br>\u2502 \u251c\u2500\u2500 aop<br>\u2502 \u2502 \u251c\u2500\u2500 aspectj<br>\u2502 \u2502 \u2502 \u2514\u2500\u2500 AspectJExpressionPointcut.java<br>\u2502 \u2502 \u2502 \u2514\u2500\u2500 AspectJExpressionPointcutAdvisor.java<br>\u2502 \u2502 \u251c\u2500\u2500 framework<br>\u2502 \u2502 \u2502 \u251c\u2500\u2500 adapter<br>\u2502 \u2502 \u2502 \u2502 \u2514\u2500\u2500 MethodBeforeAdviceInterceptor.java<br>\u2502 \u2502 \u2502 \u251c\u2500\u2500 autoproxy<br>\u2502 \u2502 \u2502 \u2502 \u2514\u2500\u2500 MethodBeforeAdviceInterceptor.java<br>\u2502 \u2502 \u2502 \u251c\u2500\u2500 AopProxy.java<br>\u2502 \u2502 \u2502 \u251c\u2500\u2500 Cglib2AopProxy.java<br>\u2502 \u2502 \u2502 \u251c\u2500\u2500 JdkDynamicAopProxy.java<br>\u2502 \u2502 \u2502 \u251c\u2500\u2500 ProxyFactory.java<br>\u2502 \u2502 \u2502 \u2514\u2500\u2500 ReflectiveMethodInvocation.java<br>\u2502 \u2502 \u251c\u2500\u2500 AdvisedSupport.java<br>\u2502 \u2502 \u251c\u2500\u2500 Advisor.java<br>\u2502 \u2502 \u251c\u2500\u2500 BeforeAdvice.java<br>\u2502 \u2502 \u251c\u2500\u2500 ClassFilter.java<br>\u2502 \u2502 \u251c\u2500\u2500 MethodBeforeAdvice.java<br>\u2502 \u2502 \u251c\u2500\u2500 MethodMatcher.java<br>\u2502 \u2502 \u251c\u2500\u2500 Pointcut.java<br>\u2502 \u2502 \u251c\u2500\u2500 PointcutAdvisor.java<br>\u2502 \u2502 \u2514\u2500\u2500 TargetSource.java<br>\u2502 \u251c\u2500\u2500 beans<br>\u2502 \u2502 \u251c\u2500\u2500 factory<br>\u2502 \u2502 \u2502 \u251c\u2500\u2500 annotation<br>\u2502 \u2502 \u2502 \u2502 \u251c\u2500\u2500 Autowired.java<br>\u2502 \u2502 \u2502 \u2502 \u251c\u2500\u2500 AutowiredAnnotationBeanPostProcessor.java<br>\u2502 \u2502 \u2502 \u2502 \u251c\u2500\u2500 Qualifier.java<br>\u2502 \u2502 \u2502 \u2502 \u2514\u2500\u2500 Value.java<br>\u2502 \u2502 \u2502 \u251c\u2500\u2500 config<br>\u2502 \u2502 \u2502 \u2502 \u251c\u2500\u2500 AutowireCapableBeanFactory.java<br>\u2502 \u2502 \u2502 \u2502 \u251c\u2500\u2500 BeanDefinition.java<br>\u2502 \u2502 \u2502 \u2502 \u251c\u2500\u2500 BeanFactoryPostProcessor.java<br>\u2502 \u2502 \u2502 \u2502 \u251c\u2500\u2500 BeanPostProcessor.java<br>\u2502 \u2502 \u2502 \u2502 \u251c\u2500\u2500 BeanReference.java<br>\u2502 \u2502 \u2502 \u2502 \u251c\u2500\u2500 ConfigurableBeanFactory.java<br>\u2502 \u2502 \u2502 \u2502 \u251c\u2500\u2500 InstantiationAwareBeanPostProcessor.java<br>\u2502 \u2502 \u2502 \u2502 \u2514\u2500\u2500 SingletonBeanRegistry.java<br>\u2502 \u2502 \u2502 \u251c\u2500\u2500 support<br>\u2502 \u2502 \u2502 \u2502 \u251c\u2500\u2500 AbstractAutowireCapableBeanFactory.java<br>\u2502 \u2502 \u2502 \u2502 \u251c\u2500\u2500 AbstractBeanDefinitionReader.java<br>\u2502 \u2502 \u2502 \u2502 \u251c\u2500\u2500 AbstractBeanFactory.java<br>\u2502 \u2502 \u2502 \u2502 \u251c\u2500\u2500 BeanDefinitionReader.java<br>\u2502 \u2502 \u2502 \u2502 \u251c\u2500\u2500 BeanDefinitionRegistry.java<br>\u2502 \u2502 \u2502 \u2502 \u251c\u2500\u2500 CglibSubclassingInstantiationStrategy.java<br>\u2502 \u2502 \u2502 \u2502 \u251c\u2500\u2500 DefaultListableBeanFactory.java<br>\u2502 \u2502 \u2502 \u2502 \u251c\u2500\u2500 DefaultSingletonBeanRegistry.java<br>\u2502 \u2502 \u2502 \u2502 \u251c\u2500\u2500 DisposableBeanAdapter.java<br>\u2502 \u2502 \u2502 \u2502 \u251c\u2500\u2500 FactoryBeanRegistrySupport.java<br>\u2502 \u2502 \u2502 \u2502 \u251c\u2500\u2500 InstantiationStrategy.java<br>\u2502 \u2502 \u2502 \u2502 \u2514\u2500\u2500 SimpleInstantiationStrategy.java<br>\u2502 \u2502 \u2502 \u251c\u2500\u2500 Aware.java<br>\u2502 \u2502 \u2502 \u251c\u2500\u2500 BeanClassLoaderAware.java<br>\u2502 \u2502 \u2502 \u251c\u2500\u2500 BeanFactory.java<br>\u2502 \u2502 \u2502 \u251c\u2500\u2500 BeanFactoryAware.java<br>\u2502 \u2502 \u2502 \u251c\u2500\u2500 BeanNameAware.java<br>\u2502 \u2502 \u2502 \u251c\u2500\u2500 ConfigurableListableBeanFactory.java<br>\u2502 \u2502 \u2502 \u251c\u2500\u2500 DisposableBean.java<br>\u2502 \u2502 \u2502 \u251c\u2500\u2500 FactoryBean.java<br>\u2502 \u2502 \u2502 \u251c\u2500\u2500 HierarchicalBeanFactory.java<br>\u2502 \u2502 \u2502 \u251c\u2500\u2500 InitializingBean.java<br>\u2502 \u2502 \u2502 \u251c\u2500\u2500 ListableBeanFactory.java<br>\u2502 \u2502 \u2502 \u2514\u2500\u2500 PropertyPlaceholderConfigurer.java<br>\u2502 \u2502 \u251c\u2500\u2500 BeansException.java<br>\u2502 \u2502 \u251c\u2500\u2500 PropertyValue.java<br>\u2502 \u2502 \u2514\u2500\u2500 PropertyValues.java<br>\u2502 \u251c\u2500\u2500 context<br>\u2502 \u2502 \u251c\u2500\u2500 annotation<br>\u2502 \u2502 \u2502 \u251c\u2500\u2500 ClassPathBeanDefinitionScanner.java<br>\u2502 \u2502 \u2502 \u251c\u2500\u2500 ClassPathScanningCandidateComponentProvider.java<br>\u2502 \u2502 \u2502 \u2514\u2500\u2500 Scope.java<br>\u2502 \u2502 \u251c\u2500\u2500 event<br>\u2502 \u2502 \u2502 \u251c\u2500\u2500 AbstractApplicationEventMulticaster.java<br>\u2502 \u2502 \u2502 \u251c\u2500\u2500 ApplicationContextEvent.java<br>\u2502 \u2502 \u2502 \u251c\u2500\u2500 ApplicationEventMulticaster.java<br>\u2502 \u2502 \u2502 \u251c\u2500\u2500 ContextClosedEvent.java<br>\u2502 \u2502 \u2502 \u251c\u2500\u2500 ContextRefreshedEvent.java<br>\u2502 \u2502 \u2502 \u2514\u2500\u2500 SimpleApplicationEventMulticaster.java<br>\u2502 \u2502 \u251c\u2500\u2500 support<br>\u2502 \u2502 \u2502 \u251c\u2500\u2500 AbstractApplicationContext.java<br>\u2502 \u2502 \u2502 \u251c\u2500\u2500 AbstractRefreshableApplicationContext.java<br>\u2502 \u2502 \u2502 \u251c\u2500\u2500 AbstractXmlApplicationContext.java<br>\u2502 \u2502 \u2502 \u251c\u2500\u2500 ApplicationContextAwareProcessor.java<br>\u2502 \u2502 \u2502 \u2514\u2500\u2500 ClassPathXmlApplicationContext.java<br>\u2502 \u2502 \u251c\u2500\u2500 ApplicationContext.java<br>\u2502 \u2502 \u251c\u2500\u2500 ApplicationContextAware.java<br>\u2502 \u2502 \u251c\u2500\u2500 ApplicationEvent.java<br>\u2502 \u2502 \u251c\u2500\u2500 ApplicationEventPublisher.java<br>\u2502 \u2502 \u251c\u2500\u2500 ApplicationListener.java<br>\u2502 \u2502 \u2514\u2500\u2500 ConfigurableApplicationContext.java<br>\u2502 \u251c\u2500\u2500 core.io<br>\u2502 \u2502 \u251c\u2500\u2500 ClassPathResource.java<br>\u2502 \u2502 \u251c\u2500\u2500 DefaultResourceLoader.java<br>\u2502 \u2502 \u251c\u2500\u2500 FileSystemResource.java<br>\u2502 \u2502 \u251c\u2500\u2500 Resource.java<br>\u2502 \u2502 \u251c\u2500\u2500 ResourceLoader.java<br>\u2502 \u2502 \u2514\u2500\u2500 UrlResource.java<br>\u2502 \u251c\u2500\u2500 stereotype<br>\u2502 \u2502 \u2514\u2500\u2500 Component.java<br>\u2502 \u2514\u2500\u2500 utils<br>\u2502 \u251c\u2500\u2500 ClassUtils.java<br>\u2502 \u2514\u2500\u2500 StringValueResolver.java<br>\u2514\u2500\u2500 test<br>\u2514\u2500\u2500 java<br>\u2514\u2500\u2500 cn.bugstack.springframework.test<br>\u251c\u2500\u2500 bean<br>\u2502 \u251c\u2500\u2500 IUserService.java<br>\u2502 \u2514\u2500\u2500 UserService.java<br>\u2514\u2500\u2500 ApiTest.java<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">2.\u81ea\u52a8\u626b\u63cf\u6ce8\u5165\u5360\u4f4d\u7b26\u914d\u7f6e\u548c\u5bf9\u8c61\u7684\u7c7b\u5173\u7cfb\uff1a<\/h2>\n\n\n\n<figure class=\"wp-block-image\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/bugstack.cn\/assets\/images\/spring\/spring-15-02.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  decoding=\"async\" data-original=\"https:\/\/bugstack.cn\/assets\/images\/spring\/spring-15-02.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\u56fe 15-2\"\/><\/div><\/figure>\n\n\n\n<h1 class=\"wp-block-heading\">\u5b9e\u73b0\uff1a<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">1.\u5b9a\u4e49\u89e3\u6790\u5b57\u7b26\u4e32\u63a5\u53e3\uff1a<\/h2>\n\n\n\n<p>\u5b9a\u4e49StringValueResolver\u63a5\u53e3\uff0c\u7528\u4e8e\u89e3\u6790\u5360\u4f4d\u7b26\u5b57\u7b26\u4e32\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/**\n * \u5b57\u7b26\u4e32\u503c\u89e3\u6790\u5668\u63a5\u53e3\u3002\n * \u5b9a\u4e49\u4e86\u89e3\u6790\u5b57\u7b26\u4e32\u7684\u65b9\u6cd5\uff0c\u901a\u5e38\u7528\u4e8e\u89e3\u6790\u5360\u4f4d\u7b26\u6216\u8868\u8fbe\u5f0f\uff0c\n * \u5c06\u8f93\u5165\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u89e3\u6790\u540e\u7684\u5b9e\u9645\u503c\u3002\n *\/\npublic interface StringValueResolver {\n    String resolveStringValue(String strVal);\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">2.\u586b\u5145\u5c5e\u6027\u503c\u5230\u5bb9\u5668\uff1a<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">2.1 \u65b0\u589e\u96c6\u5408<code>embeddedValueResolvers<\/code>\u00a0\uff1a<\/h3>\n\n\n\n<p>\u5728 AbstractBeanFactory \u4e2d\u65b0\u589e\u4e86\u4e00\u4e2a\u96c6\u5408\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/*\n    embeddedValueResolvers \u96c6\u5408\u5b58\u50a8 StringValueResolver \u5b9e\u4f8b\uff0c\n    \u7528\u4e8e\u89e3\u6790\u5360\u4f4d\u7b26\u5b57\u7b26\u4e32\uff08\u5982 ${token}\uff09\u4ee5\u6ce8\u5165\u914d\u7f6e\u503c\u6216\u52a8\u6001\u503c\u5230Bean\u7684\u5c5e\u6027\u6216\u6ce8\u89e3\u4e2d\u3002\n     *\/\n    private final List&lt;StringValueResolver> embeddedValueResolvers = new ArrayList&lt;>();<\/code><\/pre>\n\n\n\n<p>\u5728ConfigurableBeanFactory\u5b9a\u4e49\u65b9\u6cd5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/**\n     * \u6dfb\u52a0\u4e00\u4e2a\u5b57\u7b26\u4e32\u89e3\u6790\u5668\uff0c\u7528\u4e8e\u89e3\u6790\u5d4c\u5165\u7684\u503c\uff0c\u4f8b\u5982\u6ce8\u89e3\u5c5e\u6027\u3002\n     *\/\n    void addEmbeddedValueResolver(StringValueResolver valueResolver);\n\n    \/**\n     * \u89e3\u6790\u7ed9\u5b9a\u7684\u5d4c\u5165\u503c\uff0c\u4f8b\u5982\u6ce8\u89e3\u5c5e\u6027\u3002\n     *\/\n    String resolveEmbeddedValue(String value);<\/code><\/pre>\n\n\n\n<p>\u5e76\u5728AbstractBeanFactory \u4e2d\u5b9e\u73b0\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>@Override\n    public void addEmbeddedValueResolver(StringValueResolver valueResolver) {\n        this.embeddedValueResolvers.add(valueResolver);\n    }\n\n    @Override\n    public String resolveEmbeddedValue(String value) {\n        String result = value;\n        for (StringValueResolver resolver : this.embeddedValueResolvers) {\n            result = resolver.resolveStringValue(result);\n        }\n        return result;\n    }<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">2.2 \u62d3\u5c55PropertyPlaceholderConfigurer\uff1a<br><\/h2>\n\n\n\n<p>\u4f18\u5316\u903b\u8f91\u5e76\u65b0\u589evalueResolver \u76f8\u5173\u529f\u80fd\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/**\n * \u8be5\u7c7b\u5b9e\u73b0\u4e86Spring\u7684BeanFactoryPostProcessor\u63a5\u53e3\uff0c\n * \u7528\u4e8e\u5904\u7406Bean\u5b9a\u4e49\u4e2d\u7684\u5c5e\u6027\u5360\u4f4d\u7b26\uff0c\u5c06${...}\u5f62\u5f0f\u7684\u5360\u4f4d\u7b26\u66ff\u6362\u4e3a\u5c5e\u6027\u6587\u4ef6\u4e2d\u7684\u5b9e\u9645\u503c\n *\/\npublic class PropertyPlaceholderConfigurer implements BeanFactoryPostProcessor {\n\n    \/**\n     * \u9ed8\u8ba4\u7684\u5360\u4f4d\u7b26\u524d\u7f00: {@value}\n     *\/\n    public static final String DEFAULT_PLACEHOLDER_PREFIX = \"${\";\n\n    \/**\n     * \u9ed8\u8ba4\u7684\u5360\u4f4d\u7b26\u540e\u7f00: {@value}\n     *\/\n    public static final String DEFAULT_PLACEHOLDER_SUFFIX = \"}\";\n\n    \/\/ \u5c5e\u6027\u6587\u4ef6\u7684\u4f4d\u7f6e\n    private String location;\n\n    \/**\n     * \u5b9e\u73b0BeanFactoryPostProcessor\u63a5\u53e3\u7684\u65b9\u6cd5\uff0c\u5728BeanFactory\u52a0\u8f7d\u5b8c\u6240\u6709Bean\u5b9a\u4e49\u540e\u6267\u884c\n     * \u7528\u4e8e\u66ff\u6362Bean\u5b9a\u4e49\u4e2d\u7684\u5c5e\u6027\u5360\u4f4d\u7b26\n     * @param beanFactory \u53ef\u914d\u7f6e\u7684Bean\u5de5\u5382\uff0c\u7528\u4e8e\u83b7\u53d6\u548c\u4fee\u6539Bean\u5b9a\u4e49\n     * @throws BeansException \u5982\u679c\u5904\u7406\u8fc7\u7a0b\u4e2d\u53d1\u751f\u9519\u8bef\n     *\/\n\n    @Override\n    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {\n        try {\n            \/\/ 1. \u521b\u5efa\u8d44\u6e90\u52a0\u8f7d\u5668\uff0c\u52a0\u8f7d\u6307\u5b9a\u4f4d\u7f6e\u7684\u5c5e\u6027\u6587\u4ef6\n            DefaultResourceLoader resourceLoader = new DefaultResourceLoader();\n            Resource resource = resourceLoader.getResource(location);\n\n            \/\/ 2. \u8bfb\u53d6\u5c5e\u6027\u6587\u4ef6\u5185\u5bb9\u5230 Properties \u5bf9\u8c61\u4e2d\n            Properties properties = new Properties();\n            properties.load(resource.getInputStream());\n\n            \/\/ 3. \u904d\u5386\u5bb9\u5668\u4e2d\u6240\u6709 BeanDefinition\n            String&#91;] beanDefinitionNames = beanFactory.getBeanDefinitionNames();\n            for (String beanName : beanDefinitionNames) {\n                BeanDefinition beanDefinition = beanFactory.getBeanDefinition(beanName);\n\n                \/\/ 4. \u83b7\u53d6\u8be5 BeanDefinition \u7684\u6240\u6709\u5c5e\u6027\u503c\n                PropertyValues propertyValues = beanDefinition.getPropertyValues();\n                for (PropertyValue propertyValue : propertyValues.getPropertyValues()) {\n                    Object value = propertyValue.getValue();\n\n                    \/\/ 5. \u53ea\u5904\u7406\u5b57\u7b26\u4e32\u7c7b\u578b\u7684\u5c5e\u6027\u503c\n                    if (!(value instanceof String)) continue;\n\n                    \/\/ 6. \u66ff\u6362\u5c5e\u6027\u503c\u4e2d\u7684\u5360\u4f4d\u7b26\uff08\u5982 ${xxx}\uff09\n                    value = resolvePlaceholder((String) value, properties);\n\n                    \/\/ 7. \u5c06\u66ff\u6362\u540e\u7684\u503c\u91cd\u65b0\u5199\u56de\u5230\u5c5e\u6027\u5217\u8868\n                    propertyValues.addPropertyValue(new PropertyValue(propertyValue.getName(), value));\n                }\n            }\n\n            \/\/ 8. \u5411 BeanFactory \u6ce8\u518c\u4e00\u4e2a\u5b57\u7b26\u4e32\u89e3\u6790\u5668\n            \/\/    \u8fd9\u4e2a\u89e3\u6790\u5668\u4f1a\u5728\u89e3\u6790 @Value \u6ce8\u89e3\u65f6\u751f\u6548\uff0c\u7528\u4e8e\u5904\u7406\u5360\u4f4d\u7b26\n            StringValueResolver valueResolver = new PlaceholderResolvingStringValueResolver(properties);\n            beanFactory.addEmbeddedValueResolver(valueResolver);\n\n        } catch (IOException e) {\n            \/\/ 9. \u5c5e\u6027\u6587\u4ef6\u52a0\u8f7d\u5931\u8d25\u65f6\uff0c\u629b\u51fa BeansException\n            throw new BeansException(\"Could not load properties\", e);\n        }\n    }\n\n\n    \/**\n     * \u89e3\u6790\u5b57\u7b26\u4e32\u4e2d\u7684\u5360\u4f4d\u7b26\u5e76\u66ff\u6362\u4e3a\u5bf9\u5e94\u7684\u5c5e\u6027\u503c\u3002\n     * \u5360\u4f4d\u7b26\u683c\u5f0f\u4e3a `${key}`\uff0c\u4ece\u7ed9\u5b9a\u7684 Properties \u4e2d\u83b7\u53d6 key \u5bf9\u5e94\u7684\u503c\u8fdb\u884c\u66ff\u6362\u3002\n     * \u5982\u679c\u5b57\u7b26\u4e32\u4e2d\u4e0d\u5b58\u5728\u5360\u4f4d\u7b26\uff0c\u5219\u8fd4\u56de\u539f\u5b57\u7b26\u4e32\u3002\n     *\/\n    private String resolvePlaceholder(String value, Properties properties) {\n        String strVal = value;\n        StringBuilder buffer = new StringBuilder(strVal);\n        int startIdx = strVal.indexOf(DEFAULT_PLACEHOLDER_PREFIX);\n        int stopIdx = strVal.indexOf(DEFAULT_PLACEHOLDER_SUFFIX);\n        if (startIdx != -1 &amp;&amp; stopIdx != -1 &amp;&amp; startIdx &lt; stopIdx) {\n            String propKey = strVal.substring(startIdx + 2, stopIdx);\n            String propVal = properties.getProperty(propKey);\n            buffer.replace(startIdx, stopIdx + 1, propVal);\n        }\n        return buffer.toString();\n    }\n\n\n    \/**\n     * \u8bbe\u7f6e\u5c5e\u6027\u6587\u4ef6\u7684\u4f4d\u7f6e\n     * @param location \u5c5e\u6027\u6587\u4ef6\u7684\u8def\u5f84\n     *\/\n    public void setLocation(String location) {\n        this.location = location;\n    }\n\n    private class PlaceholderResolvingStringValueResolver implements StringValueResolver {\n\n        private final Properties properties;\n\n        public PlaceholderResolvingStringValueResolver(Properties properties) {\n            this.properties = properties;\n        }\n\n        @Override\n        public String resolveStringValue(String strVal) {\n            return PropertyPlaceholderConfigurer.this.resolvePlaceholder(strVal, properties);\n        }\n\n    }\n\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">3.\u81ea\u5b9a\u4e49\u5c5e\u6027\u6ce8\u5165\u6ce8\u89e3<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>\/**\n * \u503c\u6ce8\u5165\u6ce8\u89e3\u3002\n * \u7528\u4e8e\u5c06\u5916\u90e8\u914d\u7f6e\u6216\u8868\u8fbe\u5f0f\u7684\u503c\u6ce8\u5165\u5230\u5b57\u6bb5\u3001\u65b9\u6cd5\u53c2\u6570\u7b49\u4f4d\u7f6e\u3002\n *\/\n@Target({ElementType.FIELD, ElementType.METHOD, ElementType.PARAMETER})\n@Retention(RetentionPolicy.RUNTIME)\n@Documented\npublic @interface Value {\n\n    \/**\n     * \u8981\u6ce8\u5165\u7684\u5b9e\u9645\u503c\u6216\u8868\u8fbe\u5f0f\uff0c\u4f8b\u5982 \"#{systemProperties.myProp}\"\u3002\n     *\/\n    String value();\n}\n<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\/**\n * \u81ea\u52a8\u6ce8\u5165\u6ce8\u89e3\u3002\n * &lt;p>\u7528\u4e8e\u6807\u8bb0\u6784\u9020\u5668\u3001\u5b57\u6bb5\u6216\u65b9\u6cd5\uff0c\u8868\u793a\u4f9d\u8d56\u7531 Spring \u5bb9\u5668\u81ea\u52a8\u88c5\u914d\u3002\n *\/\n@Retention(RetentionPolicy.RUNTIME)\n@Target({ElementType.CONSTRUCTOR, ElementType.FIELD, ElementType.METHOD})\npublic @interface Autowired {\n}<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\/**\n * \u9650\u5b9a\u7b26\u6ce8\u89e3\u3002\n * &lt;p>\u4e0e @Autowired \u914d\u5408\u4f7f\u7528\uff0c\u7528\u4e8e\u6309\u540d\u79f0\u7cbe\u786e\u6307\u5b9a\u6ce8\u5165\u7684 Bean\u3002\n *\/\n@Target({ElementType.FIELD, ElementType.METHOD, ElementType.PARAMETER, ElementType.TYPE, ElementType.ANNOTATION_TYPE})\n@Retention(RetentionPolicy.RUNTIME)\n@Inherited\n@Documented\npublic @interface Qualifier {\n\n    \/**\n     * \u6307\u5b9a\u6ce8\u5165\u7684 Bean \u540d\u79f0\u3002\n     *\/\n    String value() default \"\";\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">4. \u626b\u63cf\u6ce8\u89e3<\/h2>\n\n\n\n<p>\u5b9e\u73b0AutowiredAnnotationBeanPostProcessor\uff0c\u5904\u7406\u6ce8\u89e3\u6ce8\u5165\u3002<\/p>\n\n\n\n<p>\u6b64\u5904\u53c8\u63d0\u5230\u4e86AutowiredAnnotationBeanPostProcessor\uff0c\u90a3\u6211\u4eec\u5c31\u6765\u52a0\u6df1\u4e0b\u8bb0\u5fc6\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u7279\u6027<\/th><th>BeanPostProcessor<\/th><th>InstantiationAwareBeanPostProcessor<\/th><th>BeanFactoryPostProcessor<\/th><\/tr><\/thead><tbody><tr><td><strong>\u4f5c\u7528\u5bf9\u8c61<\/strong><\/td><td>\u9488\u5bf9&nbsp;<strong>Bean \u5b9e\u4f8b<\/strong>&nbsp;\u8fdb\u884c\u5904\u7406<\/td><td>\u9488\u5bf9&nbsp;<strong>Bean \u5b9e\u4f8b\u5316\u8fc7\u7a0b<\/strong>&nbsp;\u8fdb\u884c\u5e72\u9884<\/td><td>\u9488\u5bf9&nbsp;<strong>BeanFactory\uff08\u5bb9\u5668\uff09<\/strong>&nbsp;\u53ca&nbsp;<strong>BeanDefinition<\/strong>&nbsp;\u8fdb\u884c\u5904\u7406<\/td><\/tr><tr><td><strong>\u4f5c\u7528\u9636\u6bb5<\/strong><\/td><td>Bean \u5b9e\u4f8b\u5316&nbsp;<strong>\u4e4b\u540e<\/strong>\uff08\u6784\u9020\u65b9\u6cd5\u6267\u884c\u540e\uff09<\/td><td>Bean \u5b9e\u4f8b\u5316&nbsp;<strong>\u4e4b\u524d<\/strong>&nbsp;+ \u5b9e\u4f8b\u5316\u540e\u3001\u5c5e\u6027\u586b\u5145\u524d<\/td><td>Bean \u5b9e\u4f8b\u5316&nbsp;<strong>\u4e4b\u524d<\/strong>\uff08\u5bb9\u5668\u542f\u52a8\u521d\u671f\uff0cBeanDefinition \u52a0\u8f7d\u540e\uff09<\/td><\/tr><tr><td><strong>\u6838\u5fc3\u65b9\u6cd5<\/strong><\/td><td>&#8211;&nbsp;<code>postProcessBeforeInitialization()<\/code><br>&#8211;&nbsp;<code>postProcessAfterInitialization()<\/code><\/td><td>&#8211;&nbsp;<code>postProcessBeforeInstantiation()<\/code><br>&#8211;&nbsp;<code>postProcessAfterInstantiation()<\/code><br>&#8211;&nbsp;<code>postProcessProperties()<\/code><\/td><td>&#8211;&nbsp;<code>postProcessBeanFactory()<\/code><\/td><\/tr><tr><td><strong>\u5178\u578b\u7528\u9014<\/strong><\/td><td>\u5b9e\u4f8b\u521d\u59cb\u5316\u524d\u540e\u589e\u5f3a\uff08\u5982 AOP \u4ee3\u7406\u3001\u6dfb\u52a0\u5c5e\u6027\uff09<\/td><td>\u63a7\u5236\u5b9e\u4f8b\u5316\u8fc7\u7a0b\uff08\u5982\u8fd4\u56de\u4ee3\u7406\u66ff\u4ee3\u539f\u59cb\u5bf9\u8c61\uff09\u3001\u5c5e\u6027\u6ce8\u5165\u524d\u5904\u7406\uff08\u5982\u89e3\u6790&nbsp;<code>@Autowired<\/code>\uff09<\/td><td>\u4fee\u6539 BeanDefinition\uff08\u5982\u52a8\u6001\u6ce8\u518c Bean\u3001\u4fee\u6539\u5c5e\u6027\u503c\uff09\u3001\u81ea\u5b9a\u4e49 BeanFactory \u914d\u7f6e<\/td><\/tr><tr><td><strong>\u6267\u884c\u65f6\u673a<\/strong><\/td><td>\u5728&nbsp;<code>InitializingBean.afterPropertiesSet()<\/code>&nbsp;\u6216\u81ea\u5b9a\u4e49\u521d\u59cb\u5316\u65b9\u6cd5\u524d\u540e<\/td><td>\u5728 Bean \u6784\u9020\u65b9\u6cd5\u8c03\u7528\u524d\u3001\u540e\uff0c\u4ee5\u53ca\u5c5e\u6027\u586b\u5145\u524d<\/td><td>\u5728\u6240\u6709 BeanDefinition \u52a0\u8f7d\u5b8c\u6210\uff0c\u4f46\u672a\u5f00\u59cb\u5b9e\u4f8b\u5316\u4efb\u4f55 Bean \u65f6<\/td><\/tr><tr><td><strong>\u5e38\u89c1\u5b9e\u73b0\u7c7b<\/strong><\/td><td><code>AnnotationAwareAspectJAutoProxyCreator<\/code>\uff08AOP \u4ee3\u7406\uff09<\/td><td><code>AutowiredAnnotationBeanPostProcessor<\/code>\uff08\u5904\u7406&nbsp;<code>@Autowired<\/code>\uff09<\/td><td><code>PropertyPlaceholderConfigurer<\/code>\uff08\u5904\u7406&nbsp;<code>@Value<\/code>&nbsp;\u5360\u4f4d\u7b26\uff09\u3001<code>ConfigurationClassPostProcessor<\/code>\uff08\u5904\u7406&nbsp;<code>@Configuration<\/code>\uff09<\/td><\/tr><tr><td><strong>\u662f\u5426\u4fee\u6539 Bean \u5b9a\u4e49<\/strong><\/td><td>\u4e0d\u4fee\u6539\uff0c\u4ec5\u5904\u7406\u5df2\u5b9e\u4f8b\u5316\u7684 Bean<\/td><td>\u4e0d\u76f4\u63a5\u4fee\u6539 BeanDefinition\uff0c\u4ec5\u5e72\u9884\u5b9e\u4f8b\u5316\u8fc7\u7a0b<\/td><td>\u76f4\u63a5\u4fee\u6539 BeanDefinition\uff08\u5982\u5c5e\u6027\u3001\u4f5c\u7528\u57df\u7b49\uff09<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">4.1 \u524d\u7f6e\u4fee\u6539\uff1a<\/h3>\n\n\n\n<p>\u53c8\u5230\u4e86\u8fd9\u4e2a\u6559\u7a0b\u6700\u7231\u7684\u83ab\u540d\u5176\u5999\u56de\u9a6c\u67aa\u7684\u65f6\u95f4\u4e86\uff1a<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>BeanFactory\u6dfb\u52a0\uff1a<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;T> T getBean(Class&lt;T> requiredType) throws BeansException;<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u6240\u4ee5DefaultListableBeanFactory\u5b9e\u73b0\uff1a<\/h3>\n\n\n\n<pre class=\"wp-block-preformatted\">@Override<br>public &lt;T&gt; T getBean(Class&lt;T&gt; requiredType) throws BeansException {<br>    List&lt;String&gt; beanNames = new ArrayList&lt;&gt;();<br>    for (Map.Entry&lt;String, BeanDefinition&gt; entry : beanDefinitionMap.entrySet()) {<br>        Class beanClass = entry.getValue().getBeanClass();<br>        if (requiredType.isAssignableFrom(beanClass)) {<br>            beanNames.add(entry.getKey());<br>        }<br>    }<br>    if (1 == beanNames.size()) {<br>        return getBean(beanNames.get(0), requiredType);<br>    }<br><br>    throw new BeansException(requiredType + \"expected single bean but found \" + beanNames.size() + \": \" + beanNames);<br>}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u540c\u6837\u7684AbstractApplicationContext\u5b9e\u73b0\uff1a<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>@Override<br>public &lt;T&gt; T getBean(Class&lt;T&gt; requiredType) throws BeansException {<br>    return getBeanFactory().getBean(requiredType);<br>}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">InstantiationAwareBeanPostProcessor \u6dfb\u52a0\uff1a<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>\/**\n     * \u5728\u5de5\u5382\u5c06\u5c5e\u6027\u503c\u5e94\u7528\u5230\u7ed9\u5b9a Bean \u4e4b\u524d\uff0c\u5bf9\u8fd9\u4e9b\u5c5e\u6027\u503c\u8fdb\u884c\u540e\u7f6e\u5904\u7406\u3002\n     * \u4f8b\u5982\uff0c\u53ef\u4ee5\u5728\u8fd9\u91cc\u68c0\u67e5\u6240\u6709\u4f9d\u8d56\u662f\u5426\u5df2\u6ee1\u8db3\uff0c\n     * \u4e5f\u53ef\u4ee5\u57fa\u4e8e Bean \u5c5e\u6027\u7684 setter \u65b9\u6cd5\u4e0a\u7684 \u201c@Required\u201d \u6ce8\u89e3\u8fdb\u884c\u4f9d\u8d56\u6821\u9a8c\u3002\n     *\n     * \u5728 Bean \u5b9e\u4f8b\u5316\u5b8c\u6210\u540e\u3001\u6267\u884c\u5c5e\u6027\u586b\u5145\u64cd\u4f5c\u4e4b\u524d\u8c03\u7528\u6b64\u65b9\u6cd5\u3002\n     *\n     *\/\n    PropertyValues postProcessPropertyValues(PropertyValues pvs, Object bean, String beanName) throws BeansException;<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u800cDefaultAdvisorAutoProxyCreator\u5b9e\u73b0\u4e86InstantiationAwareBeanPostProcessor\uff1b<\/h3>\n\n\n\n<pre class=\"wp-block-preformatted\">\u6dfb\u52a0\u5b9e\u73b0\uff1a<\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>@Override<br>public PropertyValues postProcessPropertyValues(PropertyValues pvs, Object bean, String beanName) throws BeansException {<br>    return pvs;<br>}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">5.\u6ce8\u518c\u6ce8\u89e3\u5904\u7406\u5668<\/h2>\n\n\n\n<p>\u7531\u4e8eAutowiredAnnotationBeanPostProcessor\u5e76\u6ca1\u6709\u6807\u6ce8@Component,\u6240\u4ee5\u662f\u65e0\u6cd5\u5728\u7c7b\u626b\u63cf\u65f6\u6ce8\u5165\u5230beanFactory\u4e2d\u7684,\u6b64\u5904\u9700\u8981\u6211\u4eec\u624b\u52a8\u8fdb\u884c\u6ce8\u518c\u3002<br>\u662f Spring \u6846\u67b6\u7684\u5185\u90e8\u7ec4\u4ef6\uff0c\u65e8\u5728\u4e3a\u6240\u6709\u542f\u7528\u6ce8\u89e3\u626b\u63cf\u7684\u9879\u76ee\u63d0\u4f9b\u652f\u6301\uff0c\u6240\u4ee5\u9700\u8981\u5728spring\u5185\u90e8\u6ce8\u518c\uff0c\u800c\u4e0d\u662f\u50cf\u4e0a\u4e00\u7bc7\u7684PropertyPlaceholderConfigurer\u624b\u52a8\u914d\u7f6e\u4e3aBean\u3002<\/p>\n\n\n\n<p>\u5728ClassPathBeanDefinitionScanner\u4e2d\u624b\u52a8\u6ce8\u518cAutowiredAnnotationBeanPostProcessor\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>public class ClassPathBeanDefinitionScanner extends ClassPathScanningCandidateComponentProvider {\n    \/\/ ...\n    public void doScan(String... basePackages) {\n        \/\/ \u626b\u63cf\u5e76\u6ce8\u518cBeanDefinition\n        \/\/ ...\n        registry.registerBeanDefinition(\"internalAutowiredAnnotationProcessor\", new BeanDefinition(AutowiredAnnotationBeanPostProcessor.class));\n    }\n}<\/code><\/pre>\n\n\n\n<p>\u867d\u7136\u662f\u88ab\u624b\u52a8\u914d\u7f6e\u4e3abean\u7684\uff0c\u4f46\u662f\u89e6\u53d1\u6761\u4ef6\uff1a\u6ce8\u518c\u8fc7\u7a0b\u7531 \u6216 @ComponentScan \u89e6\u53d1\uff0c\u53d1\u751f\u5728 XmlBeanDefinitionReader\u7684 doLoadBeanDefinitions\u65b9\u6cd5\u4e2d\uff0c\u6b64\u65f6\u5c31\u4f1a\u6ce8\u518c\u4e00\u4e2aClassPathBeanDefinitionScanner\uff0c\u7136\u540e\u5c06AutowiredAnnotationBeanPostProcessor\u6ce8\u518c\u5230Bean\u6ce8\u518c\u5bb9\u5668\u4e2d\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><br>6. \u5728Bean\u7684\u751f\u547d\u5468\u671f\u4e2d\u8c03\u7528\u5c5e\u6027\u6ce8\u5165\uff1a<\/h2>\n\n\n\n<p><strong>AbstractAutowireCapableBeanFactory<\/strong>\uff1a<\/p>\n\n\n\n<p><strong>createBean\u4e2d\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>******\n        try {\n            \/\/ \u521b\u5efa\u5b9e\u4f8b\n            bean = createBeanInstance(beanDefinition, beanName, args);\n        } catch (Exception e) {\n            throw new BeansException(\"Failed to create bean instance for: \" + beanName, e);\n        }\n\n        try {\n            \/\/ \u5728\u8bbe\u7f6e Bean \u5c5e\u6027\u4e4b\u524d\uff0c\u5141\u8bb8 AutowiredAnnotationBeanPostProcessor \u4fee\u6539\u5c5e\u6027\u503c(@Autowired\u3001@Value)\n            applyBeanPostProcessorsBeforeApplyingPropertyValues(beanName, bean, beanDefinition);\n        } catch (Exception e) {\n            throw new BeansException(\"Failed to process @Autowired\/@Value annotations for bean: \" + beanName, e);\n        }\n\n        try {\n            \/\/ \u6ce8\u5165\u5c5e\u6027\n            applyPropertyValues(bean, beanName, beanDefinition);\n        } catch (Exception e) {\n            throw new BeansException(\"Failed to apply property values for bean: \" + beanName, e);\n        }\n******<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\/**\n     * \u5728\u4e3a Bean \u586b\u5145\u5c5e\u6027\uff08\u4f9d\u8d56\u6ce8\u5165\uff09\u4e4b\u524d\uff0c\u5141\u8bb8 BeanPostProcessor \u5bf9\u5c5e\u6027\u503c\u8fdb\u884c\u4fee\u6539\u3002\n     *\n     * \u8fd9\u91cc\u4e3b\u8981\u662f\u4e3a\u4e86\u652f\u6301\u7c7b\u4f3c @Autowired\u3001@Value\u3001@Resource \u7b49\u6ce8\u89e3\u9a71\u52a8\u7684\u4f9d\u8d56\u6ce8\u5165\uff0c\n     * \u56e0\u4e3a\u5b83\u4eec\u4f9d\u8d56\u4e8e InstantiationAwareBeanPostProcessor \u5728\u5c5e\u6027\u8bbe\u7f6e\u524d\u8fdb\u884c\u89e3\u6790\u4e0e\u8d4b\u503c\u3002\n     *\n     * @param beanName        \u5f53\u524d Bean \u7684\u540d\u79f0\n     * @param bean            \u5df2\u7ecf\u5b9e\u4f8b\u5316\u597d\u7684 Bean \u5bf9\u8c61\uff08\u6784\u9020\u65b9\u6cd5\u5df2\u8c03\u7528\uff0c\u4f46\u5c5e\u6027\u8fd8\u672a\u6ce8\u5165\uff09\n     * @param beanDefinition  Bean \u5bf9\u5e94\u7684\u5b9a\u4e49\u4fe1\u606f\uff08\u5305\u542b\u5c5e\u6027\u3001\u6784\u9020\u53c2\u6570\u7b49\uff09\n     *\/\n    protected void applyBeanPostProcessorsBeforeApplyingPropertyValues(String beanName, Object bean, BeanDefinition beanDefinition) {\n        \/\/ \u904d\u5386\u5f53\u524d\u5bb9\u5668\u4e2d\u6ce8\u518c\u7684\u6240\u6709 BeanPostProcessor\n        for (BeanPostProcessor beanPostProcessor : getBeanPostProcessors()) {\n            \/\/ \u53ea\u6709 InstantiationAwareBeanPostProcessor \u624d\u80fd\u5728\u5c5e\u6027\u8bbe\u7f6e\u524d\u505a\u5904\u7406\n            if (beanPostProcessor instanceof InstantiationAwareBeanPostProcessor) {\n                \/\/ \u8c03\u7528\u5176 postProcessPropertyValues \u65b9\u6cd5\uff0c\u8ba9\u5b83\u6709\u673a\u4f1a\u4fee\u6539 Bean \u7684\u5c5e\u6027\u503c\n                \/\/ \u4f8b\u5982 AutowiredAnnotationBeanPostProcessor \u4f1a\u5728\u8fd9\u91cc\u89e3\u6790 @Autowired \u5e76\u751f\u6210\u5bf9\u5e94\u7684\u4f9d\u8d56\u6ce8\u5165 PropertyValue\n                PropertyValues pvs = ((InstantiationAwareBeanPostProcessor) beanPostProcessor)\n                        .postProcessPropertyValues(beanDefinition.getPropertyValues(), bean, beanName);\n\n                \/\/ \u5982\u679c\u5904\u7406\u5668\u8fd4\u56de\u4e86\u65b0\u7684\u5c5e\u6027\u503c\u96c6\u5408\uff0c\u5219\u5408\u5e76\u5230 BeanDefinition \u7684\u5c5e\u6027\u5217\u8868\u4e2d\n                if (null != pvs) {\n                    for (PropertyValue propertyValue : pvs.getPropertyValues()) {\n                        beanDefinition.getPropertyValues().addPropertyValue(propertyValue);\n                    }\n                }\n            }\n        }\n    }<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<h1 class=\"wp-block-heading\">\u6d4b\u8bd5\uff1a<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">1.\u6d4b\u8bd5\u7c7b\uff1a<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>@Component\npublic class UserDao {\n\n    private static Map&lt;String, String> hashMap = new HashMap&lt;>();\n\n    static {\n        hashMap.put(\"10001\", \"CMD137\uff0c\u5317\u4eac\uff0c\u4ea6\u5e84\");\n        hashMap.put(\"10002\", \"CMD138\uff0c\u4e0a\u6d77\uff0c\u5c16\u6c99\u5480\");\n        hashMap.put(\"10003\", \"CMD139\uff0c\u5929\u6d25\uff0c\u4e1c\u4e3d\u533a\");\n    }\n\n    public String queryUserName(String uId) {\n        return hashMap.get(uId);\n    }\n\n}<\/code><\/pre>\n\n\n\n<p>\u8fd9\u91cc\u5305\u62ec\u4e86\u4e24\u79cd\u7c7b\u578b\u7684\u6ce8\u5165\uff0c\u4e00\u4e2a\u662f\u5360\u4f4d\u7b26\u6ce8\u5165\u5c5e\u6027\u4fe1\u606f\u00a0<code>@Value(\"${token}\")<\/code>\uff0c\u53e6\u5916\u4e00\u4e2a\u662f\u6ce8\u5165\u5bf9\u8c61\u4fe1\u606f\u00a0<code>@Autowired<\/code>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>@Component(\"userService\")<br>public class UserService implements IUserService {<br><br>    @Value(\"${token}\")<br>    private String token;<br><br>    @Autowired<br>    private UserDao userDao;<br><br>    public String queryUserInfo() {<br>        try {<br>            Thread.<em>sleep<\/em>(new Random(1).nextInt(100));<br>        } catch (InterruptedException e) {<br>            e.printStackTrace();<br>        }<br>        return userDao.queryUserName(\"10001\") + \"\uff0c\" + token;<br>    }<br><br>    @Override<br>    public String toString() {<br>        return \"UserService#token = { \" + token + \" }\";<br>    }<br><br>    public String getToken() {<br>        return token;<br>    }<br><br>    public void setToken(String token) {<br>        this.token = token;<br>    }<br>}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">2.\u914d\u7f6e\u6587\u4ef6\uff1a<\/h2>\n\n\n\n<p><strong>token.properties<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>token=123_TEST_TOKEN_321\n\n<\/code><\/pre>\n\n\n\n<p><strong>spring.xml<\/strong>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;?xml version=\"1.0\" encoding=\"UTF-8\"?>\n&lt;beans>\n    &lt;bean class=\"com.miniSpring.beans.factory.PropertyPlaceholderConfigurer\">\n        &lt;property name=\"location\" value=\"classpath:token.properties\"\/>\n    &lt;\/bean>\n\n    &lt;component-scan base-package=\"com.miniSpring.test.bean\"\/>\n&lt;\/beans>\n\n<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">3.\u00a0\u5355\u5143\u6d4b\u8bd5\uff1a<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>@Test\npublic void test_scan() {\n    ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext(\"classpath:spring.xml\");\n    IUserService userService = applicationContext.getBean(\"userService\", IUserService.class);\n    System.out.println(\"\u6d4b\u8bd5\u7ed3\u679c\uff1a\" + userService.queryUserInfo());\n}\n<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\u6d4b\u8bd5\u7ed3\u679c\uff1aCMD137\uff0c\u5317\u4eac\uff0c\u4ea6\u5e84\uff0c123_TEST_TOKEN_321\n\nProcess finished with exit code 0<\/code><\/pre>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5f15\u8a00 \u5728Spring\u6846\u67b6\u4e2d\uff0c\u4f9d\u8d56\u6ce8\u5165\uff08Dependency Injection\uff09\u662f\u6838\u5fc3\u673a\u5236\u4e4b\u4e00\uff0c\u7528\u4e8e\u7ba1\u7406Bea [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[66],"tags":[],"class_list":["post-1299","post","type-post","status-publish","format-standard","hentry","category-66"],"_links":{"self":[{"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/posts\/1299","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1299"}],"version-history":[{"count":6,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/posts\/1299\/revisions"}],"predecessor-version":[{"id":1305,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=\/wp\/v2\/posts\/1299\/revisions\/1305"}],"wp:attachment":[{"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1299"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1299"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.cmd137blog.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1299"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}