{"id":10008199,"date":"2023-08-31T12:59:50","date_gmt":"2023-08-31T04:59:50","guid":{"rendered":"https:\/\/blog.itmax.cn\/?p=10008199"},"modified":"2023-08-31T12:59:50","modified_gmt":"2023-08-31T04:59:50","slug":"factorybean-%e5%92%8c%e5%ae%83%e7%9a%84%e5%85%84%e5%bc%9fsmartfactorybean%ef%bc%81","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10008199","title":{"rendered":"FactoryBean \u548c\u5b83\u7684\u5144\u5f1fSmartFactoryBean\uff01"},"content":{"rendered":"<p>\u4e4b\u524d\u677e\u54e5\u5199\u8fc7\u4e00\u7bc7\u6587\u7ae0\uff0c\u8ddf\u5c0f\u4f19\u4f34\u4eec\u4ecb\u7ecd\u4e86\u6211\u4eec\u5728\u9762\u8bd5\u4e2d\u975e\u5e38\u5e38\u89c1\u7684\u4e00\u9053\u9762\u8bd5\u9898\uff1a<\/p>\n<ul>\n<li><a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=1P2hgodpYrFfNjY2LTcrGA%3D%3D.9k464YP0hz3T9W2sTOwdBB2jqiSTxOKN3%2FS19yjrxuxV6wa2fUIEhVc%2BrXRTQ7kLPFkbFd%2BL%2FS5%2Bojkvodj0yw%3D%3D\" rel=\"noopener noreferrer\">Spring \u4e2d BeanFactory \u548c FactoryBean \u6709\u4f55\u533a\u522b\uff1f<\/a><\/li>\n<\/ul>\n<p>\u5728\u8fd9\u7bc7\u6587\u7ae0\u4e2d\uff0c\u677e\u54e5\u4e5f\u548c\u5404\u4f4d\u5c0f\u4f19\u4f34\u6f14\u793a\u4e86\u4e86 FactoryBean \u7684\u4e00\u4e9b\u5177\u4f53\u7528\u6cd5\uff0c\u4f46\u662f\u5173\u4e8e FactoryBean \u7684\u4e00\u4e9b\u5177\u4f53\u5b9e\u8df5\uff0c\u8fd9\u7bc7\u6587\u7ae0\u4e2d\u6ca1\u6709\u8bb2\uff0c\u90a3\u4e48\u4eca\u5929\u6211\u5c31\u6765\u548c\u5927\u5bb6\u804a\u4e00\u804a\u8fd9\u4e2a\u8bdd\u9898\uff0c\u987a\u4fbf\u518d\u6765\u8bf4\u8bf4 FactoryBean \u7684\u5144\u5f1f SmartFactoryBean\u3002<\/p>\n<h2>1. \u4f7f\u7528\u5dee\u522b<\/h2>\n<p>FactoryBean \u7684\u7528\u6cd5\u6211\u5c31\u4e0d\u518d\u91cd\u590d\u4e86\uff0c\u8fd9\u91cc\u6765\u770b\u4e0b SmartFactoryBean\u3002<\/p>\n<p>FactoryBean \u6709\u5f88\u591a\u5b9e\u73b0\u7c7b\uff0c\u4f46\u662f\u7ee7\u627f\u81ea FactoryBean \u7684\u63a5\u53e3\u5374\u53ea\u6709 SmartFactoryBean \u4e00\u4e2a\u3002<\/p>\n<p>SmartFactoryBean \u63a5\u53e3\u7684\u5b9a\u4e49\u5982\u4e0b\uff1a<\/p>\n<pre><code class=\"java\">public interface SmartFactoryBean&lt;T&gt; extends FactoryBean&lt;T&gt; {\n\n    default boolean isPrototype() {\n        return false;\n    }\n\n    default boolean isEagerInit() {\n        return false;\n    }\n\n}<\/code><\/pre>\n<p>\u53ef\u4ee5\u770b\u5230\uff0cSmartFactoryBean \u5c31\u662f\u5728 FactoryBean \u7684\u57fa\u7840\u4e4b\u4e0a\u591a\u4e86\u4e24\u4e2a\u65b9\u6cd5\uff1a<\/p>\n<ul>\n<li>isPrototype\uff1a\u8fd9\u4e2a\u65b9\u6cd5\u5c31\u662f\u8fd4\u56de\u5f53\u524d Bean \u662f\u5426\u662f\u591a\u5b9e\u4f8b\u3002\u521d\u770b\u8fd9\u4e2a\u65b9\u6cd5\uff0c\u6709\u7684\u5c0f\u4f19\u4f34\u53ef\u80fd\u4f1a\u611f\u89c9\u5230\u8be7\u5f02\uff0c\u56e0\u4e3a\u5728 FactoryBean \u4e2d\u5b9e\u9645\u4e0a\u6709\u4e00\u4e2a\u8ddf\u5b83\u529f\u80fd\u7c7b\u4f3c\u7684\u65b9\u6cd5\u53eb\u505a isSingleton\uff0cisSingleton \u7684\u610f\u601d\u5c31\u662f\u8bf4\u8fd9\u4e2a Bean \u662f\u5426\u662f\u5355\u4f8b\u7684\uff0c\u90a3\u4e48\u4e3a\u4ec0\u4e48\u73b0\u5728\u8fd8\u591a\u4e86\u4e00\u4e2a isPrototype \u65b9\u6cd5\u5462\uff1f\u5728\u524d\u9762\u7684\u89c6\u9891\u4e2d\u677e\u54e5\u548c\u5927\u5bb6\u8bb2\u8fc7\uff0cSpring \u4e2d Bean \u7684 scope \u4e00\u5171\u6709\u516d\u79cd\uff0csingleton \u548c prototype \u53ea\u662f\u5176\u4e2d\u7684\u4e24\u79cd\uff0c\u6240\u4ee5\uff0cisSingleton \u4e3a true \u5c31\u8868\u793a\u662f\u5355\u4f8b\uff0c\u4f46\u662f\u4e3a false \u5e76\u4e0d\u80fd\u8868\u793a\u5c31\u662f prototype\uff0c\u540c\u7406\uff0cisPrototype \u4e3a true \u5c31\u8868\u793a\u662f\u591a\u5b9e\u4f8b\uff0c\u4f46\u662f isPrototype \u4e3a false \u5e76\u4e0d\u80fd\u8868\u793a\u5c31\u662f singleton\uff0c\u56e0\u6b64\uff0c\u8fd9\u4e24\u4e2a\u65b9\u6cd5\u662f\u4e0d\u51b2\u7a81\u7684\u3002<\/li>\n<li>isEagerInit\uff1a\u8fd9\u4e2a\u65b9\u6cd5\u5c31\u597d\u7406\u89e3\u4e86\uff0c\u65b9\u6cd5\u540d\u8868\u793a\u662f\u5426\u8981\u63d0\u524d\u521d\u59cb\u5316 Bean\u3002\u5f53\u6211\u4eec\u4f7f\u7528 FactoryBean \u7684\u65f6\u5019\uff0c\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0cSpring \u5728\u521d\u59cb\u5316 Bean \u7684\u65f6\u5019\uff0c\u521d\u59cb\u5316\u7684\u662f\u5de5\u5382 Bean\uff0c\u4f8b\u5982\u6211\u4eec\u6709\u4e00\u4e2a UserFactoryBean\uff0c\u90a3\u4e48\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0cSpring \u5bb9\u5668\u521d\u59cb\u5316\u7684\u662f UserFactoryBean\uff0c\u800c UserFactoryBean \u4e2d getObject \u65b9\u6cd5\u771f\u6b63\u8981\u8fd4\u56de\u7684 User \u5219\u5728\u7b2c\u4e00\u6b21\u4f7f\u7528\u7684\u65f6\u5019\uff0c\u624d\u4f1a\u88ab\u521d\u59cb\u5316\uff0c\u4e0d\u77e5\u4e0d\u89c9\u4e2d\uff0c\u76ee\u6807 Bean \u7684\u521d\u59cb\u5316\u5c31\u88ab\u5ef6\u8fdf\u4e86\u3002\u5982\u679c\u4e0d\u4f7f\u7528 SmartFactoryBean \u7684\u8bdd\uff0c\u90a3\u6211\u4eec\u5f97\u901a\u8fc7 Bean \u7684\u63d0\u524d\u6ce8\u5165\u7b49\u65b9\u5f0f\u53bb\u5b9e\u73b0 Bean \u7684\u63d0\u524d\u521d\u59cb\u5316\uff0c\u5982\u679c\u4f7f\u7528 SmartFactoryBean \u7684\u8bdd\uff0c\u90a3\u4e48\u5c31\u53ef\u4ee5\u901a\u8fc7\u914d\u7f6e isEagerInit \u65b9\u6cd5\u8fd4\u56de true \u6765\u5b9e\u73b0\u76ee\u6807 Bean \u63d0\u524d\u521d\u59cb\u5316\u4e86\u3002<\/li>\n<\/ul>\n<p>\u5173\u4e8e\u7b2c\u4e8c\u4e2a\u65b9\u6cd5 isEagerInit\uff0c\u6211\u4e3e\u4e2a\u4f8b\u5b50\u7ed9\u5927\u5bb6\u6f14\u793a\u4e00\u4e0b\u3002<\/p>\n<p>\u5047\u8bbe\u6211\u6709\u4e00\u4e2a User \u7c7b\uff0c\u5982\u4e0b\uff1a<\/p>\n<pre><code class=\"java\">public class User {\n    public User() {\n        System.out.println(&quot;User-init&quot;);\n    }\n}<\/code><\/pre>\n<p>\u7136\u540e\u53c8\u6709\u4e00\u4e2a UserFactoryBean\uff0c\u5982\u4e0b\uff1a<\/p>\n<pre><code class=\"java\">@Component\npublic class UserFactoryBean implements FactoryBean&lt;User&gt; {\n    public UserFactoryBean() {\n        System.out.println(&quot;UserFactoryBean-init&quot;);\n    }\n\n    @Override\n    public User getObject() throws Exception {\n        return new User();\n    }\n\n    @Override\n    public Class&lt;?&gt; getObjectType() {\n        return User.class;\n    }\n}<\/code><\/pre>\n<p>\u6700\u540e\u626b\u63cf\u8fd9\u4e2a Bean \u5e76\u4e14\u542f\u52a8\u5bb9\u5668\uff1a<\/p>\n<pre><code class=\"java\">@Configuration\n@ComponentScan\npublic class JavaConfig {\n}\npublic class Demo {\n    public static void main(String[] args) {\n        AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext(JavaConfig.class);\n    }\n}<\/code><\/pre>\n<p>\u90a3\u4e48\u5f53\u6211\u53ea\u521d\u59cb\u5316\u5bb9\u5668\uff0c\u4e0d\u4ece\u5bb9\u5668\u4e2d\u83b7\u53d6\u4efb\u4f55 Bean\uff0c\u63a7\u5236\u53f0\u5c31\u4f1a\u53ea\u6253\u5370 <code>UserFactoryBean-init<\/code>\u3002<\/p>\n<p>\u8fd9\u5c31\u8bf4\u660e\u53ea\u6709 UserFactoryBean \u88ab Spring \u5bb9\u5668\u521d\u59cb\u5316\u4e86\uff0c\u6211\u4eec\u7684 User \u5bf9\u8c61\u5176\u5b9e\u8fd8\u6ca1\u88ab\u521d\u59cb\u5316\uff0cUser \u5bf9\u8c61\u8981\u5728\u7b2c\u4e00\u6b21\u4f7f\u7528\u7684\u65f6\u5019\uff0c\u624d\u4f1a\u88ab\u521d\u59cb\u5316\u3002<\/p>\n<p>\u5982\u679c\u6211\u4eec\u7684 UserFactoryBean \u5b9e\u73b0\u7684\u662f SmartFactoryBean \u63a5\u53e3\uff0c\u90a3\u4e48\u5c31\u53ef\u4ee5\u6309\u7167\u5982\u4e0b\u65b9\u5f0f\u8fdb\u884c\u914d\u7f6e\uff1a<\/p>\n<pre><code class=\"java\">@Component\npublic class UserFactoryBean implements SmartFactoryBean&lt;User&gt; {\n    public UserFactoryBean() {\n        System.out.println(&quot;UserFactoryBean-init&quot;);\n    }\n\n    @Override\n    public boolean isEagerInit() {\n        return true;\n    }\n\n    @Override\n    public User getObject() throws Exception {\n        return new User();\n    }\n\n    @Override\n    public Class&lt;?&gt; getObjectType() {\n        return User.class;\n    }\n}<\/code><\/pre>\n<p>\u6b64\u65f6\u6211\u4eec\u542f\u52a8\u5bb9\u5668\uff0c\u4f46\u662f\u5374\u4e0d\u83b7\u53d6\u4efb\u4f55 Bean\uff0c\u90a3\u4e48\u5927\u5bb6\u5c31\u4f1a\u53d1\u73b0\uff0c<code>User-init<\/code> \u4e5f\u6253\u5370\u51fa\u6765\u4e86\uff0c\u76ee\u6807 Bean \u4e5f\u88ab\u521d\u59cb\u5316\u4e86\u3002<\/p>\n<h2>2. \u539f\u7406\u5206\u6790<\/h2>\n<p>\u63a5\u4e0b\u6765\u6211\u4eec\u5c31\u4ece\u6e90\u7801\u7684\u89d2\u5ea6\u6765\u548c\u5927\u5bb6\u7b80\u5355\u68b3\u7406\u4e00\u4e0b\u3002<\/p>\n<p>\u5927\u5bb6\u77e5\u9053\uff0c\u5bb9\u5668\u7684\u521d\u59cb\u5316\u662f\u4ece refresh \u65b9\u6cd5\u5f00\u59cb\u7684\uff0crefresh \u5728\u521d\u59cb\u5316\u7684\u8fc7\u7a0b\u4e2d\u4f1a\u8c03\u7528\u5230 finishBeanFactoryInitialization\uff0c\u800c\u5728 finishBeanFactoryInitialization \u65b9\u6cd5\u4e2d\u5219\u4f1a\u8c03\u7528\u5230 beanFactory.preInstantiateSingletons() \u65b9\u6cd5\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u7684\u4f5c\u7528\u5c31\u662f\u53bb\u521d\u59cb\u5316\u90a3\u4e9b\u4e0d\u662f\u5ef6\u8fdf\u52a0\u8f7d\u7684 Bean\u3002<\/p>\n<p>\u6240\u4ee5\uff0c\u95ee\u9898\u7684\u6838\u5fc3\u5c31\u5728 beanFactory.preInstantiateSingletons() \u65b9\u6cd5\u4e2d\uff0c\u4e00\u8d77\u6765\u770b\u4e0b\u3002<\/p>\n<p>DefaultListableBeanFactory#preInstantiateSingletons\uff1a<\/p>\n<pre><code class=\"java\">@Override\npublic void preInstantiateSingletons() throws BeansException {\n    List&lt;String&gt; beanNames = new ArrayList&lt;&gt;(this.beanDefinitionNames);\n    for (String beanName : beanNames) {\n        RootBeanDefinition bd = getMergedLocalBeanDefinition(beanName);\n        if (!bd.isAbstract() &amp;&amp; bd.isSingleton() &amp;&amp; !bd.isLazyInit()) {\n            if (isFactoryBean(beanName)) {\n                Object bean = getBean(FACTORY_BEAN_PREFIX + beanName);\n                if (bean instanceof SmartFactoryBean&lt;?&gt; smartFactoryBean &amp;&amp; smartFactoryBean.isEagerInit()) {\n                    getBean(beanName);\n                }\n            }\n            else {\n                getBean(beanName);\n            }\n        }\n    }\n    for (String beanName : beanNames) {\n        Object singletonInstance = getSingleton(beanName);\n        if (singletonInstance instanceof SmartInitializingSingleton smartSingleton) {\n            StartupStep smartInitialize = this.getApplicationStartup().start(&quot;spring.beans.smart-initialize&quot;)\n                    .tag(&quot;beanName&quot;, beanName);\n            smartSingleton.afterSingletonsInstantiated();\n            smartInitialize.end();\n        }\n    }\n}<\/code><\/pre>\n<p>\u8fd9\u4e2a\u65b9\u6cd5\u7684\u903b\u8f91\u8fd8\u662f\u6bd4\u8f83\u597d\u7406\u89e3\u3002<\/p>\n<p>\u9996\u5148 beanNames \u4e2d\u4fdd\u5b58\u7684\u5c31\u662f\u6240\u6709 bean \u540d\u79f0\uff0c\u7136\u540e\u8fdb\u884c\u904d\u5386\u3002<\/p>\n<p>\u904d\u5386\u7684\u65f6\u5019\u6839\u636e beanName \u83b7\u53d6\u5230 RootBeanDefinition\uff0c\u7136\u540e\u67e5\u770b\u7c7b\u662f\u5426\u4e0d\u662f\u62bd\u8c61\u7c7b\u3001\u662f\u5426\u662f\u5355\u4f8b\u4ee5\u53ca\u662f\u5426\u4e0d\u5ef6\u8fdf\u521d\u59cb\u5316\uff0c\u5982\u679c\u6ee1\u8db3\u6761\u4ef6\uff0c\u90a3\u4e48\u5c31\u5f00\u59cb\u521d\u59cb\u5316\u3002<\/p>\n<p>\u521d\u59cb\u5316\u7684\u65f6\u5019\uff0c\u9996\u5148\u5224\u65ad\u5f53\u524d beanName \u662f\u5426\u662f\u4e00\u4e2a FactoryBean\uff0c\u5927\u5bb6\u6ce8\u610f\uff0c\u5982\u679c\u662f FactoryBean\uff0c\u5219\u8c03\u7528 getBean \u65b9\u6cd5\u53bb\u83b7\u53d6 Bean\uff0c\u4f46\u662f\u8c03\u7528\u7684\u65f6\u5019\uff0c\u5728 beanName \u7684\u524d\u9762\u52a0\u4e0a\u4e86 FACTORY_BEAN_PREFIX\uff0c\u8fd9\u4e2a\u5176\u5b9e\u5c31\u662f <code>&amp;<\/code>\uff0c\u5728\u524d\u9762\u7684\u89c6\u9891\u4e2d\u677e\u54e5\u548c\u5927\u5bb6\u8bb2\u8fc7\uff0c\u52a0\u4e0a <code>&amp;<\/code> \u4e4b\u540e\uff0c\u8fd9\u91cc\u83b7\u53d6\u5230\u7684\u5c31\u4e0d\u662f\u76ee\u6807 Bean\uff0c\u800c\u662f\u8fd9\u4e2a FactoryBean\u3002\u8fd9\u5c31\u662f\u4e3a\u4ec0\u4e48\u5728\u7b2c\u4e00\u5c0f\u8282\u4e2d\u548c\u5927\u5bb6\u8bf4\uff0c\u4f7f\u7528 FactoryBean \u4f1a\u5bfc\u81f4\u76ee\u6807 Bean \u5ef6\u8fdf\u52a0\u8f7d\uff0c\u539f\u56e0\u5c31\u5728\u8fd9\u91cc\uff0c\u56e0\u4e3a\u521d\u59cb\u5316\u7684\u65f6\u5019\u7ed9 beanName \u52a0\u4e0a\u4e86 <code>&amp;<\/code> \u524d\u7f00\uff0c\u6240\u4ee5\u521d\u59cb\u5316\u7684\u5c31\u4e0d\u662f\u76ee\u6807 Bean \u4e86\u3002<\/p>\n<p>\u63a5\u4e0b\u6765\u8fd8\u6709\u4e00\u4e2a\u5224\u65ad\uff0c\u5982\u679c\u521d\u59cb\u5316\u51fa\u6765\u7684 Bean \u662f\u4e00\u4e2a SmartFactoryBean \u5bf9\u8c61\uff0c\u5e76\u4e14 isEagerInit \u65b9\u6cd5\u8fd8\u8fd4\u56de true\uff0c\u90a3\u4e48\u5c31\u518d\u6b21\u8c03\u7528 getBean \u65b9\u6cd5\u8fdb\u884c Bean \u7684\u521d\u59cb\u5316\uff0c\u6b64\u65f6 Bean \u7684\u521d\u59cb\u5316\u4f20\u5165\u7684 beanName \u5c31\u6ca1\u6709\u6dfb\u52a0\u524d\u7f00\u4e86\uff0c\u90a3\u4e48\u521d\u59cb\u5316\u7684\u5c31\u662f\u76ee\u6807 Bean \u4e86\uff0c\u8fd9\u4e5f\u548c\u6211\u4eec\u7b2c\u4e00\u5c0f\u8282\u4e2d\u8bb2\u7684\u7ed3\u8bba\u76f8\u7b26\u3002<\/p>\n<p>\u521d\u59cb\u5316\u7684\u65f6\u5019\uff0c\u5982\u679c\u5224\u65ad\u5f53\u524d bean \u4e0d\u662f\u4e00\u4e2a FactoryBean\uff0c\u90a3\u4e48\u5c31\u76f4\u63a5\u8c03\u7528 getBean \u65b9\u6cd5\u8fdb\u884c Bean \u7684\u521d\u59cb\u5316\u3002<\/p>\n<p>\u6700\u540e\u8fd8\u6709\u4e00\u6bb5\u903b\u8f91\uff0c\u5c31\u662f\u6839\u636e beanName \u83b7\u53d6\u5230\u5b9e\u4f8b\u540d\u79f0\uff0c\u5982\u679c\u8fd9\u4e2a\u5b9e\u4f8b\u662f\u4e00\u4e2a SmartInitializingSingleton \u7c7b\u578b\u7684\uff0c\u90a3\u4e48\u5c31\u8c03\u7528\u4e00\u4e0b\u5b83\u7684 afterSingletonsInstantiated \u65b9\u6cd5\u3002<\/p>\n<p>\u90a3\u4e48\u4e0a\u9762\u8fd9\u6bb5\u6e90\u7801\u8fd8\u6d89\u53ca\u5230\u4e24\u4e2a\u5730\u65b9\uff0c\u5206\u522b\u662f isFactoryBean \u548c getBean\u3002<\/p>\n<h3>2.1 isFactoryBean<\/h3>\n<p>\u8fd9\u4e2a\u65b9\u6cd5\u5c31\u662f\u6839\u636e beanName \u5224\u65ad\u662f\u5426\u662f\u4e00\u4e2a FactoryBean\uff0c\u5982\u4e0b\uff1a<\/p>\n<pre><code class=\"java\">@Override\npublic boolean isFactoryBean(String name) throws NoSuchBeanDefinitionException {\n    String beanName = transformedBeanName(name);\n    Object beanInstance = getSingleton(beanName, false);\n    if (beanInstance != null) {\n        return (beanInstance instanceof FactoryBean);\n    }\n    \/\/ No singleton instance found -&gt; check bean definition.\n    if (!containsBeanDefinition(beanName) &amp;&amp; getParentBeanFactory() instanceof ConfigurableBeanFactory cbf) {\n        \/\/ No bean definition found in this factory -&gt; delegate to parent.\n        return cbf.isFactoryBean(name);\n    }\n    return isFactoryBean(beanName, getMergedLocalBeanDefinition(beanName));\n}\nprotected boolean isFactoryBean(String beanName, RootBeanDefinition mbd) {\n    Boolean result = mbd.isFactoryBean;\n    if (result == null) {\n        Class&lt;?&gt; beanType = predictBeanType(beanName, mbd, FactoryBean.class);\n        result = (beanType != null &amp;&amp; FactoryBean.class.isAssignableFrom(beanType));\n        mbd.isFactoryBean = result;\n    }\n    return result;\n}<\/code><\/pre>\n<p>\u8fd9\u4e2a\u91cc\u8fb9\uff0c\u9996\u5148\u8c03\u7528 transformedBeanName \u65b9\u6cd5\u5bf9 beanName \u8fdb\u884c\u4e00\u4e2a\u9884\u5904\u7406\uff1a<\/p>\n<pre><code class=\"java\">protected String transformedBeanName(String name) {\n    return canonicalName(BeanFactoryUtils.transformedBeanName(name));\n}\npublic static String transformedBeanName(String name) {\n    if (!name.startsWith(BeanFactory.FACTORY_BEAN_PREFIX)) {\n        return name;\n    }\n    return transformedBeanNameCache.computeIfAbsent(name, beanName -&gt; {\n        do {\n            beanName = beanName.substring(BeanFactory.FACTORY_BEAN_PREFIX.length());\n        }\n        while (beanName.startsWith(BeanFactory.FACTORY_BEAN_PREFIX));\n        return beanName;\n    });\n}\npublic String canonicalName(String name) {\n    String canonicalName = name;\n    \/\/ Handle aliasing...\n    String resolvedName;\n    do {\n        resolvedName = this.aliasMap.get(canonicalName);\n        if (resolvedName != null) {\n            canonicalName = resolvedName;\n        }\n    }\n    while (resolvedName != null);\n    return canonicalName;\n}<\/code><\/pre>\n<p>\u5927\u5bb6\u770b\u5230\uff0c\u5728\u9759\u6001\u7684 transformedBeanName \u65b9\u6cd5\u4e2d\uff0c\u9996\u5148\u5224\u65ad beanName \u662f\u5426\u662f\u4ee5 <code>&amp;<\/code> \u5f00\u5934\uff0c\u5982\u679c\u4e0d\u662f\uff0c\u5219\u76f4\u63a5\u8fd4\u56de beanName \u5373\u53ef\u3002\u5426\u5219\u5c31\u901a\u8fc7\u4e00\u4e2a do{}while() \u5c06 beanName \u4e2d\u7684 <code>&amp;<\/code> \u90fd\u7ed9\u5220\u9664\u6389\uff0c\u9632\u6b62\u51fa\u73b0\u7c7b\u4f3c <code>&amp;&amp;&amp;&amp;&amp;&amp;&amp;user<\/code> \u8fd9\u79cd beanName\u3002<\/p>\n<p>\u7136\u540e\u8c03\u7528 canonicalName \u65b9\u6cd5\u83b7\u53d6\u5230\u89c4\u8303\u7684 beanName\uff0c\u56e0\u4e3a bean \u53ef\u80fd\u5b58\u5728\u522b\u540d\uff0c\u5982\u679c\u4f7f\u7528\u7684\u662f\u522b\u540d\uff0c\u5219\u5c06\u4e4b\u5728 canonicalName \u65b9\u6cd5\u4e2d\u89e3\u6790\u4e3a\u89c4\u8303\u7684 beanName\u3002<\/p>\n<p>\u6709\u4e86 beanName \u4e4b\u540e\uff0c\u63a5\u4e0b\u6765\u8c03\u7528 getSingleton \u65b9\u6cd5\u53bb\u4e00\u7ea7\u7f13\u5b58\u4e2d\u67e5\u8be2\u8fd9\u4e2a Bean \u662f\u5426\u5df2\u7ecf\u5b8c\u6210\u521d\u59cb\u5316\u4e86\uff0c\u5982\u679c\u5df2\u7ecf\u5b8c\u6210\uff0c\u90a3\u4e48\u76f4\u63a5\u5224\u65ad\u8be5 beanInstance \u662f\u5426\u4e3a FactoryBean \u5373\u53ef\uff0c\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u663e\u7136\u4e0d\u4f1a\u8d70\u8fd9\u6761\u7ebf\u3002<\/p>\n<p>\u63a5\u4e0b\u6765\u7ee7\u7eed\u5224\u65ad\u5f53\u524d beanFactory \u4e2d\u662f\u5426\u5b58\u5728\u8be5 beanName \u7684\u5b9a\u4e49\uff0c\u5982\u679c\u4e0d\u5b58\u5728\uff0c\u4e14\u5f53\u524d beanFactory \u662f ConfigurableBeanFactory\uff0c\u90a3\u4e48\u5c31\u53bb\u7236\u5bb9\u5668\u4e2d\u68c0\u67e5\u8fd9\u4e2a beanName \u5bf9\u5e94\u7684 bean \u662f\u5426\u662f isFactoryBean\u3002<\/p>\n<p>\u6700\u540e\u5b9e\u5728\u4e0d\u884c\uff0c\u5c31\u8c03\u7528\u53e6\u5916\u4e00\u4e2a\u91cd\u8f7d\u7684 isFactoryBean \u65b9\u6cd5\u53bb\u5224\u65ad\uff0c\u8fd9\u4e2a\u91cd\u8f7d\u7684\u65b9\u6cd5\u903b\u8f91\u5c31\u6bd4\u8f83\u7b80\u5355\u4e86\uff0c\u4ece BeanDefinition \u4e2d\u83b7\u53d6\u5230 Bean \u7684\u7c7b\u578b\uff0c\u7136\u540e\u5224\u65ad\u662f\u5426\u662f FactoryBean \u5373\u53ef\u3002<\/p>\n<p>\u8fd9\u5c31\u662f\u5224\u65ad\u4e00\u4e2a beanName \u5bf9\u5e94\u7684 Bean \u662f\u5426\u4e3a FactoryBean \u7684\u6240\u6709\u903b\u8f91\u3002<\/p>\n<h3>2.2 getBean<\/h3>\n<p>\u53e6\u4e00\u65b9\u9762\u5c31\u662f getBean \u65b9\u6cd5\u4e86\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u7684\u6267\u884c\u53ef\u4ee5\u5206\u4e3a\u4e24\u6b65\u3002<\/p>\n<p>\u518d\u6765\u56de\u987e\u4e0b preInstantiateSingletons \u65b9\u6cd5\u4e2d\u7684\u5982\u4e0b\u903b\u8f91\uff1a<\/p>\n<pre><code class=\"java\">if (isFactoryBean(beanName)) {\n    Object bean = getBean(FACTORY_BEAN_PREFIX + beanName);\n    if (bean instanceof SmartFactoryBean&lt;?&gt; smartFactoryBean &amp;&amp; smartFactoryBean.isEagerInit()) {\n        getBean(beanName);\n    }\n}<\/code><\/pre>\n<p>\u53ef\u4ee5\u770b\u5230\uff0c\u65e0\u8bba\u662f\u5426\u63d0\u524d\u521d\u59cb\u5316\u76ee\u6807 Bean\uff0c\u90fd\u9700\u8981\u5148\u521d\u59cb\u5316 FactoryBean\uff0c\u4e5f\u5c31\u662f\u81ea\u52a8\u52a0\u4e0a <code>&amp;<\/code> \u524d\u7f00\u7136\u540e\u53bb\u8c03\u7528 getBean \u65b9\u6cd5\uff0cFactoryBean \u7684\u521d\u59cb\u5316\u5c31\u548c\u666e\u901a Bean \u7684\u521d\u59cb\u5316\u6d41\u7a0b\u4e00\u6837\uff0c\u6211\u8fd9\u91cc\u5c31\u4e0d\u91cd\u590d\u4e86\u3002<\/p>\n<p>\u7136\u540e\uff0c\u5982\u679c\u662f\u8981\u63d0\u524d\u521d\u59cb\u5316 Bean\uff0c\u5219\u8fd8\u4f1a\u518d\u8c03\u7528\u4e00\u6b21 getBean \u65b9\u6cd5\uff0c\u8fd9\u6b21\u8c03\u7528\u4e0d\u52a0 <code>&amp;<\/code> \u524d\u7f00\uff0c\u6240\u4ee5\u8fd9\u6b21\u8c03\u7528\u6700\u7ec8\u5c31\u4f1a\u89e6\u53d1\u5230 FactoryBean \u7684 getObject \u65b9\u6cd5\u3002<\/p>\n<p>getBean \u7684\u8c03\u7528\u6700\u7ec8\u4f1a\u6765\u5230 AbstractBeanFactory#doGetBean \u65b9\u6cd5\u4e2d\uff0c\u6211\u4eec\u6765\u7b80\u5355\u770b\u4e0b\u8fd9\u4e2a\u65b9\u6cd5\u7684\u903b\u8f91\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u6bd4\u8f83\u957f\uff0c\u6211\u8fd9\u91cc\u5217\u51fa\u6765\u8ddf\u6211\u4eec\u76f8\u5173\u7684\u4e00\u90e8\u5206\uff1a<\/p>\n<pre><code class=\"java\">protected &lt;T&gt; T doGetBean(\n        String name, @Nullable Class&lt;T&gt; requiredType, @Nullable Object[] args, boolean typeCheckOnly)\n        throws BeansException {\n    String beanName = transformedBeanName(name);\n    Object beanInstance;\n    Object sharedInstance = getSingleton(beanName);\n    if (sharedInstance != null &amp;&amp; args == null) {\n        beanInstance = getObjectForBeanInstance(sharedInstance, name, beanName, null);\n    }\n    \/\/\u7701\u7565\u3002\u3002\u3002\n}<\/code><\/pre>\n<p>\u5c0f\u4f19\u4f34\u4eec\u770b\u5230\uff0c\u8fd9\u91cc\u9996\u5148\u4f1a\u8c03\u7528 transformedBeanName \u65b9\u6cd5\u5bf9 bean \u540d\u79f0\u8fdb\u884c\u5904\u7406\uff0c\u5904\u7406\u4e4b\u540e\u7684 bean \u540d\u79f0\u5c31\u4e0d\u5e26 <code>&amp;<\/code> \u4e86\uff082.1 \u5c0f\u8282\u5df2\u7ecf\u4ecb\u7ecd\u8fc7\uff09\uff0c\u7136\u540e\u6839\u636e bean \u540d\u79f0\u53bb\u5355\u4f8b\u6c60\u4e2d\u83b7\u53d6 Bean \u5b9e\u4f8b\uff0c\u5982\u679c\u662f\u7b2c\u4e00\u6b21\u6765\uff0c\u4e5f\u5c31\u662f\u521d\u59cb\u5316 UserFactoryBean \u7684\u90a3\u4e00\u6b21\uff0c\u90a3\u6b21\u663e\u7136\u5355\u4f8b\u6c60\u4e2d\u662f\u6ca1\u6709\u4e1c\u897f\u7684\uff0c\u90a3\u4e48\u90a3\u4e48\u5c31\u4f1a\u8fdb\u5165\u5230 Bean \u7684\u521b\u5efa\u6d41\u7a0b\u4e2d\uff0c\u5e76\u5728\u521b\u5efa\u5b8c\u6210\u540e\uff0c\u5c06 Bean \u5b9e\u4f8b\u5b58\u5165\u5230\u5355\u4f8b\u6c60\u4e2d\uff08\u5b9e\u9645\u4e0a\u5b58\u7684\u662f UserFactoryBean \u7684\u5b9e\u4f8b\uff09\u3002<\/p>\n<p>\u5982\u679c\u662f\u7b2c\u4e8c\u6b21\u8fdb\u6765\uff0c\u7531\u4e8e\u4e0a\u4e00\u6b21\u5df2\u7ecf\u5b8c\u6210\u4e86 UserFactoryBean \u7684\u521d\u59cb\u5316\u4e86\uff0c\u7b2c\u4e8c\u6b21\u8fdb\u6765\u5355\u4f8b\u6c60\u4e2d\u663e\u7136\u662f\u6709\u4e1c\u897f\u7684\uff0c\u800c\u4e14\u8fd9\u4e2a\u4e1c\u897f\u5c31\u662f UserFactoryBean \u7684\u5b9e\u4f8b\uff0c\u6240\u4ee5\u7b2c\u4e8c\u6b21\u8fdb\u6765\u4e4b\u540e\uff0c\u4f1a\u8fdb\u5165\u5230\u63a5\u4e0b\u6765\u7684 if \u5206\u652f\u4e2d\uff08\u7b2c\u4e00\u6b21\u4e0d\u4f1a\u8fdb\u5165\u5230\u8be5\u5206\u652f\uff09\uff0c\u5728\u8fd9\u4e2a\u5206\u652f\u4e2d\uff0c\u6700\u7ec8\u89e6\u53d1 getObject \u65b9\u6cd5\u7684\u8c03\u7528\u3002<\/p>\n<blockquote><p>\u5927\u5bb6\u6ce8\u610f\uff0cgetObjectForBeanInstance \u65b9\u6cd5\u4f20\u5165\u4e86\u4e24\u4e2a bean \u540d\u79f0\u53c2\u6570\uff0c\u7b2c\u4e00\u4e2a name \u662f\u6ca1\u6709\u53bb\u9664 <code>&amp;<\/code> \u7684 beanName\uff08\u53ef\u80fd\u5305\u542b <code>&amp;<\/code> \u524d\u7f00\uff09\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u5219\u662f\u7ecf\u8fc7\u5904\u7406\u7684 beanName\uff0c\u5373\u53bb\u9664\u4e86 <code>&amp;<\/code> \u7684 beanName\u3002<\/p><\/blockquote>\n<p>\u6765\u770b\u4e0b getObjectForBeanInstance \u65b9\u6cd5\uff1a<\/p>\n<pre><code class=\"java\">protected Object getObjectForBeanInstance(\n        Object beanInstance, String name, String beanName, @Nullable RootBeanDefinition mbd) {\n    if (BeanFactoryUtils.isFactoryDereference(name)) {\n        if (beanInstance instanceof NullBean) {\n            return beanInstance;\n        }\n        if (!(beanInstance instanceof FactoryBean)) {\n            throw new BeanIsNotAFactoryException(beanName, beanInstance.getClass());\n        }\n        if (mbd != null) {\n            mbd.isFactoryBean = true;\n        }\n        return beanInstance;\n    }\n    if (!(beanInstance instanceof FactoryBean)) {\n        return beanInstance;\n    }\n    Object object = null;\n    if (mbd != null) {\n        mbd.isFactoryBean = true;\n    }\n    else {\n        object = getCachedObjectForFactoryBean(beanName);\n    }\n    if (object == null) {\n        FactoryBean&lt;?&gt; factory = (FactoryBean&lt;?&gt;) beanInstance;\n        if (mbd == null &amp;&amp; containsBeanDefinition(beanName)) {\n            mbd = getMergedLocalBeanDefinition(beanName);\n        }\n        boolean synthetic = (mbd != null &amp;&amp; mbd.isSynthetic());\n        object = getObjectFromFactoryBean(factory, beanName, !synthetic);\n    }\n    return object;\n}<\/code><\/pre>\n<p>\u6574\u4f53\u4e0a\u6765\u770b\uff0c\u8fd9\u91cc\u6709\u56db\u4e2a if \u5206\u652f\uff0c\u6211\u4eec\u5206\u522b\u6765\u770b\u3002<\/p>\n<p>\u7b2c\u4e00\u4e2a if \u5206\u652f\u4e3b\u8981\u662f\u5224\u65ad\u60f3\u8981\u83b7\u53d6\u7684 Bean \u5230\u5e95\u662f\u4e0d\u662f\u4e00\u4e2a FactoryBean\uff1fBeanFactoryUtils.isFactoryDereference(name) \u5176\u5b9e\u5c31\u662f\u5224\u65ad\u5f53\u524d\u8fd9\u4e2a name \u662f\u5426\u4ee5 <code>&amp;<\/code> \u5f00\u59cb\uff0c\u5982\u679c\u662f\u4ee5 <code>&amp;<\/code> \u5f00\u59cb\uff0c\u90a3\u5c31\u8bf4\u660e\u60f3\u8981\u83b7\u53d6\u7684\u5c31\u662f FactoryBean \u5b9e\u4f8b\uff0c\u6b64\u65f6\u5c31\u68c0\u67e5 beanInstance \u662f\u5426\u4e3a NullBean\uff0c\u662f\u5426\u4e3a FactoryBean\uff0c\u5982\u679c\u90fd\u68c0\u6d4b\u6ca1\u95ee\u9898\uff0c\u90a3\u4e48\u5c31\u628a bean \u76f4\u63a5\u8fd4\u56de\u5373\u53ef\u3002\u5982\u679c\u6211\u4eec\u662f\u60f3\u8981\u4ece Spring \u5bb9\u5668\u4e2d\u83b7\u53d6\u4e00\u4e2a FactoryBean \u7684\u5b9e\u4f8b\uff0c\u90a3\u4e48\u5f88\u660e\u663e\u5c31\u662f\u8d70\u7684\u8fd9\u6761\u7ebf\u3002<\/p>\n<p>\u7b2c\u4e8c\u4e2a if \u662f\u68c0\u67e5 beanInstance \u5982\u679c\u4e0d\u662f FactoryBean \u7684\u5b9e\u4f8b\uff0c\u8bf4\u660e\u53ef\u80fd\u5c31\u662f\u4e00\u4e2a\u666e\u901a Bean\uff0c\u90a3\u4e48\u5c31\u4e0d\u9700\u8981\u989d\u5916\u5904\u7406\uff0c\u76f4\u63a5\u8fd4\u56de\u5373\u53ef\u3002<\/p>\n<p>\u7b2c\u4e09\u4e2a if \u662f\u6807\u8bb0 FactoryBean \u7684\uff0c\u8fd9\u4e2a\u6ca1\u5565\u597d\u8bf4\u7684\u3002<\/p>\n<p>\u7b2c\u56db\u4e2a if \u5206\u652f\u5219\u662f\u5c06 beanInstance \u8f6c\u4e3a FactoryBean\uff0c\u7136\u540e\u5408\u5e76\u4e00\u4e0b BeanDefinition\uff0c\u8fdb\u800c\u5224\u65ad\u4e00\u4e0b\u8fd9\u4e2a Bean \u662f\u5426\u662f\u5728\u5185\u90e8\u4f7f\u7528\uff08synthetic\uff09\uff0c\u6700\u540e\u8c03\u7528 getObjectFromFactoryBean \u65b9\u6cd5\u53bb\u83b7\u53d6 Bean \u5bf9\u8c61\uff0c\u6ce8\u610f\u7b2c\u4e09\u4e2a\u53c2\u6570\u662f <code>!synthetic<\/code>\uff0c\u8fd9\u4e2a\u53c2\u6570\u8868\u793a\u8fd9\u4e2a\u7c7b\u662f\u5426\u8981\u4f7f\u7528 BeanPostProcessor \u5bf9\u5176\u8fdb\u884c\u5904\u7406\uff0c\u53ea\u8981\u8fd9\u4e2a Bean \u4e0d\u662f\u5185\u90e8\u4f7f\u7528\uff08synthetic=false\uff09\uff0c\u90a3\u4e48\u5c31\u4f1a\u7ed9\u5176\u5e94\u7528\u4e0a BeanPostProcessor\u3002<\/p>\n<p>\u7ee7\u7eed\u6765\u770b getObjectFromFactoryBean \u65b9\u6cd5\uff1a<\/p>\n<pre><code class=\"java\">protected Object getObjectFromFactoryBean(FactoryBean&lt;?&gt; factory, String beanName, boolean shouldPostProcess) {\n    if (factory.isSingleton() &amp;&amp; containsSingleton(beanName)) {\n        synchronized (getSingletonMutex()) {\n            Object object = this.factoryBeanObjectCache.get(beanName);\n            if (object == null) {\n                object = doGetObjectFromFactoryBean(factory, beanName);\n                Object alreadyThere = this.factoryBeanObjectCache.get(beanName);\n                if (alreadyThere != null) {\n                    object = alreadyThere;\n                }\n                else {\n                    if (shouldPostProcess) {\n                        if (isSingletonCurrentlyInCreation(beanName)) {\n                            return object;\n                        }\n                        beforeSingletonCreation(beanName);\n                        object = postProcessObjectFromFactoryBean(object, beanName);\n                        \n                    }\n                    if (containsSingleton(beanName)) {\n                        this.factoryBeanObjectCache.put(beanName, object);\n                    }\n                }\n            }\n            return object;\n        }\n    }\n    else {\n        Object object = doGetObjectFromFactoryBean(factory, beanName);\n        if (shouldPostProcess) {\n            object = postProcessObjectFromFactoryBean(object, beanName);\n        }\n        return object;\n    }\n}<\/code><\/pre>\n<p>\u8fd9\u91cc\u9996\u5148\u8c03\u7528 factory.isSingleton() \u65b9\u6cd5\u53bb\u5224\u65ad\u8fd9\u4e2a Bean \u662f\u5426\u662f\u5355\u4f8b\u6a21\u5f0f\uff0c\u8be5\u65b9\u6cd5\u5c31\u662f\u6211\u4eec\u7b2c\u4e00\u5c0f\u8282\u548c\u5927\u5bb6\u5206\u6790\u7684\u65b9\u6cd5\u3002<\/p>\n<p>\u5982\u679c\u662f\u5355\u4f8b\u6a21\u5f0f\uff0c\u5219\u53bb\u5355\u4f8b\u6c60 factoryBeanObjectCache \u4e2d\u83b7\u53d6\u5230 Bean \u5e76\u8fd4\u56de\u5373\u53ef\uff0c\u5f53\u7136\uff0c\u5355\u4f8b\u6c60\u4e2d\u53ef\u80fd\u5e76\u4e0d\u5b58\u5728\u8fd9\u4e2a Bean\uff0c\u90a3\u4e48\u5c31\u8c03\u7528 doGetObjectFromFactoryBean \u65b9\u6cd5\u8fdb\u884c\u52a0\u8f7d\uff0c\u52a0\u8f7d\u6210\u529f\u4e4b\u540e\uff0c\u518d\u7ed9\u5176\u5e94\u7528\u4e0a BeanPostProcessor\uff0c\u6700\u540e\u8fd8\u8981\u5c06\u52a0\u8f7d\u7684\u7ed3\u679c\u5b58\u5165\u5230\u5355\u4f8b\u6c60 factoryBeanObjectCache \u4e2d\uff0c\u65b9\u4fbf\u4e0b\u4e00\u6b21\u4f7f\u7528\u3002<\/p>\n<p>\u5982\u679c\u4e0d\u662f\u5355\u4f8b\u6a21\u5f0f\uff0c\u90a3\u4e48\u5c31\u4e0d\u53bb\u5355\u4f8b\u6c60\u4e2d\u67e5\u627e\uff0c\u76f4\u63a5\u8c03\u7528 doGetObjectFromFactoryBean \u65b9\u6cd5\u53bb\u83b7\u53d6 Bean \u5b9e\u4f8b\u5373\u53ef\uff0c\u83b7\u53d6\u5230\u4e4b\u540e\uff0c\u4e5f\u6839\u636e shouldPostProcess \u53c2\u6570\u4e3a\u4e4b\u5e94\u7528 BeanPostProcessor\u3002<\/p>\n<p>\u6240\u6709\u7684\u7ebf\u7d22\u90fd\u6307\u5411\u4e86 doGetObjectFromFactoryBean\uff0c\u6211\u4eec\u518d\u6765\u770b\u8fd9\u4e2a\u65b9\u6cd5\uff1a<\/p>\n<pre><code class=\"java\">private Object doGetObjectFromFactoryBean(FactoryBean&lt;?&gt; factory, String beanName) throws BeanCreationException {\n    Object object;\n        if (System.getSecurityManager() != null) {\n            AccessControlContext acc = getAccessControlContext();\n            object = AccessController.doPrivileged((PrivilegedExceptionAction&lt;Object&gt;) factory::getObject, acc);\n        }\n        else {\n            object = factory.getObject();\n        }\n    }\n    if (object == null) {\n        object = new NullBean();\n    }\n    return object;\n}<\/code><\/pre>\n<p>\u8fd9\u91cc\u505a\u4e86\u4e00\u4e9b\u6743\u9650\u7684\u5224\u65ad\uff08\u9632\u6b62\u5bf9\u4ee3\u7801\u5757\u6ca1\u6709\u6267\u884c\u6743\u9650\uff09\uff0c\u5f53\u7136\u65e0\u8bba\u662f\u5426\u6709\u6743\u9650\uff0c\u6700\u7ec8\u90fd\u4f1a\u8c03\u7528\u5230 factory.getObject() \u65b9\u6cd5\uff0c\u7ec8\u4e8e\u5230\u7ec8\u70b9\u5566~<\/p>\n<p>\u62ff\u5230 object \u4e4b\u540e\uff0c\u518d\u505a\u4e00\u4e2a\u7b80\u5355\u5224\u65ad\uff0c\u5982\u679c object \u4e3a null\uff0c\u90a3\u4e48\u5c31\u521b\u5efa\u4e00\u4e2a NullBean \u5e76\u8fd4\u56de\u5373\u53ef\u3002<\/p>\n<p>\u597d\u5566\uff0c\u8fd9\u5c31\u662f FactoryBean \u7684\u5b8c\u6574\u521b\u5efa\u6d41\u7a0b\u5566~<\/p>\n<h2>3. \u5c0f\u7ed3<\/h2>\n<p>\u597d\u5566\uff0c\u4eca\u5929\u5c31\u548c\u5c0f\u4f19\u4f34\u4eec\u5206\u4eab\u4e86 FactoryBean \u548c\u5b83\u7684\u5144\u5f1f SmartFactoryBean\uff0c\u5176\u5b9e\u65e0\u8bba\u662f\u76ee\u6807 Bean \u8fd8\u662f FactoryBean\uff0c\u4e00\u5f00\u59cb\u7684\u5904\u7406\u6d41\u7a0b\u90fd\u662f\u76f8\u4f3c\u7684\uff0c\u5206\u6b67\u4ea7\u751f\u5728 AbstractBeanFactory#doGetBean \u65b9\u6cd5\u4e2d\uff0c\u4ece\u8fd9\u4e2a\u65b9\u6cd5\u4e2d\u662f\u5426\u83b7\u53d6\u5230 beanInstance \u5b9e\u4f8b\u5f00\u59cb\uff0c\u4e00\u4e2a\u5411\u4e1c\u4e00\u4e2a\u5411\u897f~<\/p>\n<p>\u5c0f\u4f19\u4f34\u4eec\u4e0d\u59a8 debug \u8d70\u4e00\u904d\u6d41\u7a0b\u54e6~<\/p>\n<p><a href=\"https:\/\/segmentfault.com\/a\/1190000044168339\">https:\/\/segmentfault.com\/a\/1190000044168339<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e4b\u524d\u677e\u54e5\u5199\u8fc7\u4e00\u7bc7\u6587\u7ae0\uff0c\u8ddf\u5c0f\u4f19\u4f34\u4eec\u4ecb\u7ecd\u4e86\u6211\u4eec\u5728\u9762\u8bd5\u4e2d\u975e\u5e38\u5e38\u89c1\u7684\u4e00\u9053\u9762\u8bd5\u9898\uff1a Spring \u4e2d BeanFacto [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-10008199","post","type-post","status-publish","format-standard","hentry","category-share"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10008199","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10008199"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10008199\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10008199"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10008199"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10008199"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}