{"id":10008249,"date":"2023-09-08T09:38:47","date_gmt":"2023-09-08T01:38:47","guid":{"rendered":"https:\/\/blog.itmax.cn\/?p=10008249"},"modified":"2023-09-08T09:38:47","modified_gmt":"2023-09-08T01:38:47","slug":"%e4%b8%83%e7%a7%8d-beandefinition%ef%bc%8c%e5%90%84%e6%98%be%e5%85%b6%e8%83%bd%ef%bc%81","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10008249","title":{"rendered":"\u4e03\u79cd BeanDefinition\uff0c\u5404\u663e\u5176\u80fd\uff01"},"content":{"rendered":"<p>\u805a\u6c99\u6210\u5854\uff01\u4e0d\u77e5\u4e0d\u89c9 Spring \u6e90\u7801\u5df2\u7ecf\u8fde\u7eed\u66f4\u4e86\u4e24\u4e2a\u6708\u5566\uff0c\u89c6\u9891\u4e5f\u5f55\u5236\u4e86\u4e0d\u5c11\u4e86\uff0c\u5bf9 Spring \u6e90\u7801\u5206\u6790\u611f\u5174\u8da3\u7684\u5c0f\u4f19\u4f34\u6233\u8fd9\u91cc\u54e6<a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=tFaEW84%2BtvfYLWrXHA%2BkLA%3D%3D.VHD8LHiaNPSX2rdLjoq8dSJ5OP6q4wFy%2Foi8%2B3pZIcdAj2EyvYE76P0xnOX6%2FF%2BANTGrHoU2kHmTEuugiOOqfg%3D%3D\" rel=\"noopener noreferrer\">Spring\u6e90\u7801\u5e94\u8be5\u600e\u4e48\u5b66\uff1f<\/a>\uff5e<\/p>\n<p>\u4eca\u5929\u6211\u4eec\u7ee7\u7eed\u6765\u770b Spring \u6e90\u7801\u4e2d\u4e00\u4e2a\u975e\u5e38\u91cd\u8981\u7684\u6982\u5ff5\uff1aBeanDefinition\u3002<\/p>\n<h2>1.BeanDefinition<\/h2>\n<p>\u5728 Spring \u5bb9\u5668\u4e2d\uff0c\u6211\u4eec\u5e7f\u6cdb\u4f7f\u7528\u7684\u662f\u4e00\u4e2a\u4e00\u4e2a\u7684 Bean\uff0cBeanDefinition \u4ece\u540d\u5b57\u4e0a\u5c31\u53ef\u4ee5\u770b\u51fa\u662f\u5173\u4e8e Bean \u7684\u5b9a\u4e49\u3002<\/p>\n<p>\u4e8b\u5b9e\u4e0a\u5c31\u662f\u8fd9\u6837\uff0c\u6211\u4eec\u5728 XML \u6587\u4ef6\u4e2d\u914d\u7f6e\u7684 Bean \u7684\u5404\u79cd\u5c5e\u6027\uff0c\u4ea6\u6216\u8005\u7528\u6ce8\u89e3\u5b9a\u4e49\u51fa\u6765\u7684 Bean \u7684\u5404\u79cd\u5c5e\u6027\uff0c\u5728\u771f\u6b63\u751f\u6210 Bean \u76f4\u63a5\uff0c\u6211\u4eec\u9700\u8981\u5148\u5bf9\u8fd9\u4e9b\u8bbe\u7f6e\u7684\u5c5e\u6027\u8fdb\u884c\u89e3\u6790\uff0c\u89e3\u6790\u7684\u7ed3\u679c\u9700\u8981\u6709\u4e00\u4e2a\u5bf9\u8c61\u6765\u627f\u8f7d\uff0c\u5f88\u660e\u663e\uff0c\u8fd9\u4e2a\u5bf9\u8c61\u5c31\u662f BeanDefinition\u3002<\/p>\n<p>\u65e0\u8bba\u662f\u901a\u8fc7 XML \u4e2d\u5b9a\u4e49\u7684 Bean \u5c5e\u6027\u8fd8\u662f\u901a\u8fc7 Java \u4ee3\u7801\u5b9a\u4e49\u7684 Bean \u5c5e\u6027\uff0c\u90fd\u4f1a\u5148\u52a0\u8f7d\u5230 BeanDefinition \u4e0a\uff0c\u7136\u540e\u901a\u8fc7 BeanDefinition \u6765\u751f\u6210\u4e00\u4e2a Bean\uff0c\u4ece\u8fd9\u4e2a\u89d2\u5ea6\u6765\u8bf4\uff0cBeanDefinition \u548c Bean \u7684\u5173\u7cfb\u6709\u70b9\u7c7b\u4f3c\u4e8e\u7c7b\u548c\u5bf9\u8c61\u7684\u5173\u7cfb\uff0cBeanDefinition \u662f\u6a21\u677f\uff0cBean \u662f\u6a21\u677f\u5177\u4f53\u5316\u4e4b\u540e\u7684\u4ea7\u7269\u3002<\/p>\n<p>\u8981\u7406\u89e3 BeanDefinition\uff0c\u6211\u4eec\u4ece BeanDefinition \u7684\u7ee7\u627f\u5173\u7cfb\u5f00\u59cb\u770b\u8d77\u3002<\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044194107\" alt=\"\" title=\"\"><\/p>\n<p>BeanDefinition \u662f\u4e00\u4e2a\u63a5\u53e3\uff0c\u7ee7\u627f\u81ea BeanMetadataElement \u548c AttributeAccessor \u63a5\u53e3\u3002<\/p>\n<ul>\n<li>BeanMetadataElement\uff1a\u8be5\u63a5\u53e3\u53ea\u6709\u4e00\u4e2a\u65b9\u6cd5 getSource\uff0c\u8be5\u65b9\u6cd5\u8fd4\u56de Bean \u7684\u6765\u6e90\u3002<\/li>\n<li>AttributeAccessor\uff1a\u8be5\u63a5\u53e3\u4e3b\u8981\u89c4\u8303\u4e86\u95ee\u4efb\u610f\u5bf9\u8c61\u5143\u6570\u636e\u7684\u65b9\u6cd5\u3002<\/li>\n<\/ul>\n<p>\u6211\u4eec\u6765\u770b\u4e0b AttributeAccessor\uff1a<\/p>\n<pre><code class=\"java\">public interface AttributeAccessor {\n    void setAttribute(String name, @Nullable Object value);\n    @Nullable\n    Object getAttribute(String name);\n    @Nullable\n    Object removeAttribute(String name);\n    boolean hasAttribute(String name);\n    String[] attributeNames();\n}<\/code><\/pre>\n<p>\u8fd9\u91cc\u5b9a\u4e49\u4e86\u5143\u6570\u636e\u7684\u8bbf\u95ee\u63a5\u53e3\uff0c\u5177\u4f53\u7684\u5b9e\u73b0\u5219\u662f AttributeAccessorSupport\uff0c\u8fd9\u4e9b\u6570\u636e\u91c7\u7528 LinkedHashMap \u8fdb\u884c\u5b58\u50a8\u3002<\/p>\n<p>\u8fd9\u662f BeanDefinition \u6240\u7ee7\u627f\u7684\u4e24\u4e2a\u63a5\u53e3\u3002\u63a5\u4e0b\u6765\u6211\u4eec\u6765\u770b\u4e0b BeanDefinition \u63a5\u53e3\uff1a<\/p>\n<pre><code class=\"java\">public interface BeanDefinition extends AttributeAccessor, BeanMetadataElement {\n    String SCOPE_SINGLETON = ConfigurableBeanFactory.SCOPE_SINGLETON;\n    String SCOPE_PROTOTYPE = ConfigurableBeanFactory.SCOPE_PROTOTYPE;\n    int ROLE_APPLICATION = 0;\n    int ROLE_SUPPORT = 1;\n    int ROLE_INFRASTRUCTURE = 2;\n    void setParentName(@Nullable String parentName);\n    @Nullable\n    String getParentName();\n    void setBeanClassName(@Nullable String beanClassName);\n    @Nullable\n    String getBeanClassName();\n    void setScope(@Nullable String scope);\n    @Nullable\n    String getScope();\n    void setLazyInit(boolean lazyInit);\n    boolean isLazyInit();\n    void setDependsOn(@Nullable String... dependsOn);\n    @Nullable\n    String[] getDependsOn();\n    void setAutowireCandidate(boolean autowireCandidate);\n    boolean isAutowireCandidate();\n    void setPrimary(boolean primary);\n    boolean isPrimary();\n    void setFactoryBeanName(@Nullable String factoryBeanName);\n    @Nullable\n    String getFactoryBeanName();\n    void setFactoryMethodName(@Nullable String factoryMethodName);\n    @Nullable\n    String getFactoryMethodName();\n    ConstructorArgumentValues getConstructorArgumentValues();\n    default boolean hasConstructorArgumentValues() {\n        return !getConstructorArgumentValues().isEmpty();\n    }\n    MutablePropertyValues getPropertyValues();\n    default boolean hasPropertyValues() {\n        return !getPropertyValues().isEmpty();\n    }\n    void setInitMethodName(@Nullable String initMethodName);\n    @Nullable\n    String getInitMethodName();\n    void setDestroyMethodName(@Nullable String destroyMethodName);\n    @Nullable\n    String getDestroyMethodName();\n    void setRole(int role);\n    int getRole();\n    void setDescription(@Nullable String description);\n    @Nullable\n    String getDescription();\n    ResolvableType getResolvableType();\n    boolean isSingleton();\n    boolean isPrototype();\n    boolean isAbstract();\n    @Nullable\n    String getResourceDescription();\n    @Nullable\n    BeanDefinition getOriginatingBeanDefinition();\n}<\/code><\/pre>\n<p>BeanDefinition \u4e2d\u7684\u65b9\u6cd5\u867d\u7136\u591a\uff0c\u4f46\u662f\u7ed3\u5408\u6211\u4eec\u5e73\u65f6\u5728 XML\/Java \u4e2d\u7684\u914d\u7f6e\uff0c\u8fd9\u4e9b\u65b9\u6cd5\u5176\u5b9e\u90fd\u5f88\u597d\u7406\u89e3\uff1a<\/p>\n<ol>\n<li>\u9996\u5148\u4e00\u5f00\u59cb\u5b9a\u4e49\u4e86\u4e24\u4e2a\u53d8\u91cf\u7528\u6765\u63cf\u8ff0 Bean \u662f\u4e0d\u662f\u5355\u4f8b\u7684\uff0c\u540e\u9762\u7684 setScope\/getScope \u65b9\u6cd5\u53ef\u4ee5\u7528\u6765\u4fee\u6539\/\u83b7\u53d6 scope \u5c5e\u6027\u3002<\/li>\n<li>ROLE_xxx \u7528\u6765\u63cf\u8ff0\u4e00\u4e2a Bean \u7684\u89d2\u8272\uff0cROLE_APPLICATION \u8868\u793a\u8fd9\u4e2a Bean \u662f\u7528\u6237\u81ea\u5df1\u5b9a\u4e49\u7684 Bean\uff1bROLE_SUPPORT \u8868\u793a\u8fd9\u4e2a Bean \u662f\u67d0\u4e9b\u590d\u6742\u914d\u7f6e\u7684\u652f\u6491\u90e8\u5206\uff1bROLE_INFRASTRUCTURE \u8868\u793a\u8fd9\u662f\u4e00\u4e2a Spring \u5185\u90e8\u7684 Bean\uff0c\u901a\u8fc7 setRole\/getRole \u53ef\u4ee5\u4fee\u6539\u3002<\/li>\n<li>setParentName\/getParentName \u7528\u6765\u914d\u7f6e parent \u7684\u540d\u79f0\uff0c\u8fd9\u5757\u53ef\u80fd\u6709\u7684\u5c0f\u4f19\u4f34\u4f7f\u7528\u8f83\u5c11\uff0c\u8fd9\u4e2a\u5bf9\u5e94\u7740 XML \u4e2d\u7684 <code>&lt;bean parent=&quot;&quot;&gt;<\/code> \u914d\u7f6e\uff0c\u5728\u4e4b\u524d\u7684\u89c6\u9891\u4e2d\u677e\u54e5\u5df2\u7ecf\u548c\u5927\u5bb6\u8bb2\u8fc7\u4e86 Spring \u4e2d parent \u7684\u4f7f\u7528\u4e86\u3002<\/li>\n<li>setBeanClassName\/getBeanClassName \u8fd9\u4e2a\u5c31\u662f\u914d\u7f6e Bean \u7684 Class \u5168\u8def\u5f84\uff0c\u5bf9\u5e94 XML \u4e2d\u7684 <code>&lt;bean class=&quot;&quot;&gt;<\/code> \u914d\u7f6e\u3002<\/li>\n<li>setLazyInit\/isLazyInit \u914d\u7f6e\/\u83b7\u53d6 Bean \u662f\u5426\u61d2\u52a0\u8f7d\uff0c\u8fd9\u4e2a\u5bf9\u5e94\u4e86 XML \u4e2d\u7684 <code>&lt;bean lazy-init=&quot;&quot;&gt;<\/code> \u914d\u7f6e\u3002<\/li>\n<li>setDependsOn\/getDependsOn \u914d\u7f6e\/\u83b7\u53d6 Bean \u7684\u4f9d\u8d56\u5bf9\u8c61\uff0c\u8fd9\u4e2a\u5bf9\u5e94\u4e86 XML \u4e2d\u7684 <code>&lt;bean depends-on=&quot;&quot;&gt;<\/code> \u914d\u7f6e\u3002<\/li>\n<li>setAutowireCandidate\/isAutowireCandidate \u914d\u7f6e\/\u83b7\u53d6 Bean \u662f\u5426\u662f\u81ea\u52a8\u88c5\u914d\uff0c\u5bf9\u5e94\u4e86 XML \u4e2d\u7684 <code>&lt;bean autowire-candidate=&quot;&quot;&gt;<\/code> \u914d\u7f6e\u3002<\/li>\n<li>setPrimary\/isPrimary \u914d\u7f6e\/\u83b7\u53d6\u5f53\u524d Bean \u662f\u5426\u4e3a\u9996\u9009\u7684 Bean\uff0c\u5bf9\u5e94\u4e86 XML \u4e2d\u7684 <code>&lt;bean primary=&quot;&quot;&gt;<\/code> \u914d\u7f6e\u3002<\/li>\n<li>setFactoryBeanName\/getFactoryBeanName \u914d\u7f6e\/\u83b7\u53d6 FactoryBean \u7684\u540d\u5b57\uff0c\u5bf9\u5e94\u4e86 XML \u4e2d\u7684 <code>&lt;bean factory-bean=&quot;&quot;&gt;<\/code> \u914d\u7f6e\uff0cfactory-bean \u677e\u54e5\u5728\u4e4b\u524d\u7684\u89c6\u9891\u4e2d\u8bb2\u8fc7\uff0c\u5c0f\u4f19\u4f34\u4eec\u53ef\u4ee5\u53c2\u8003\u8fd9\u91cc:<a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=MyJPsCb5mET3x2clQJtFGg%3D%3D.vmlG4v%2Bg1XCF%2F4ETPPU3rMlLHQBnE%2FcyoO4zYmoFxRxVK8wkYiZ%2F5MuWUnb0%2BkJ3lz9LSHCx2%2Fnmz0OD3WKkYg%3D%3D\" rel=\"noopener noreferrer\">Spring\u6e90\u7801\u5e94\u8be5\u600e\u4e48\u5b66\uff1f<\/a>\u3002<\/li>\n<li>setFactoryMethodName\/getFactoryMethodName \u548c\u4e0a\u4e00\u6761\u6210\u5bf9\u51fa\u73b0\u7684\uff0c\u5bf9\u5e94\u4e86 XML \u4e2d\u7684 <code>&lt;bean factory-method=&quot;&quot;&gt;<\/code> \u914d\u7f6e\uff0c\u4e0d\u518d\u8d58\u8ff0\u3002<\/li>\n<li>getConstructorArgumentValues \u8fd4\u56de\u8be5 Bean \u6784\u9020\u65b9\u6cd5\u7684\u53c2\u6570\u503c\u3002<\/li>\n<li>hasConstructorArgumentValues \u5224\u65ad\u4e0a\u4e00\u6761\u662f\u5426\u662f\u7a7a\u5bf9\u8c61\u3002<\/li>\n<li>getPropertyValues \u8fd9\u4e2a\u662f\u83b7\u53d6\u666e\u901a\u5c5e\u6027\u7684\u96c6\u5408\u3002<\/li>\n<li>hasPropertyValues \u5224\u65ad\u4e0a\u4e00\u6761\u662f\u5426\u4e3a\u7a7a\u5bf9\u8c61\u3002<\/li>\n<li>setInitMethodName\/setDestroyMethodName \u914d\u7f6e Bean \u7684\u521d\u59cb\u5316\u65b9\u6cd5\u3001\u9500\u6bc1\u65b9\u6cd5\u3002<\/li>\n<li>setDescription\/getDescription \u914d\u7f6e\/\u8fd4\u56de Bean \u7684\u63cf\u8ff0\u3002<\/li>\n<li>isSingleton Bean \u662f\u5426\u4e3a\u5355\u4f8b\u3002<\/li>\n<li>isPrototype Bean \u662f\u5426\u4e3a\u539f\u578b\u3002<\/li>\n<li>isAbstract Bean \u662f\u5426\u62bd\u8c61\u3002<\/li>\n<li>getResourceDescription \u8fd4\u56de\u5b9a\u4e49 Bean \u7684\u8d44\u6e90\u63cf\u8ff0\u3002<\/li>\n<li>getOriginatingBeanDefinition \u5982\u679c\u5f53\u524d BeanDefinition \u662f\u4e00\u4e2a\u4ee3\u7406\u5bf9\u8c61\uff0c\u90a3\u4e48\u8be5\u65b9\u6cd5\u53ef\u4ee5\u7528\u6765\u8fd4\u56de\u539f\u59cb\u7684 BeanDefinition \u3002<\/li>\n<\/ol>\n<p>\u8fd9\u4e2a\u5c31\u662f BeanDefinition \u7684\u5b9a\u4e49\u4ee5\u53ca\u5b83\u91cc\u8fb9\u65b9\u6cd5\u7684\u542b\u4e49\u3002<\/p>\n<h2>2.BeanDefinition \u5b9e\u73b0\u7c7b<\/h2>\n<p>\u4e0a\u9762\u53ea\u662f BeanDefinition \u63a5\u53e3\u7684\u5b9a\u4e49\uff0cBeanDefinition \u8fd8\u62e5\u6709\u8bf8\u591a\u5b9e\u73b0\u7c7b\uff0c\u6211\u4eec\u4e5f\u6765\u5927\u81f4\u4e86\u89e3\u4e0b\u3002<\/p>\n<p>\u5148\u6765\u770b\u4e00\u5f20\u7ee7\u627f\u5173\u7cfb\u56fe\uff1a<\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044194108\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u8fd9\u4e48\u591a\u5b9e\u73b0\u7c7b\u770b\u7740\u6709\u70b9\u773c\u82b1\u7f2d\u4e71\uff0c\u4e0d\u8fc7\u641e\u6e05\u695a\u4e86\u6bcf\u4e00\u4e2a\u63a5\u53e3\u548c\u7c7b\u7684\u4f5c\u7528\uff0c\u518d\u770b\u5c31\u5f88\u5bb9\u6613\u4e86\u3002<\/p>\n<h3>2.1 AbstractBeanDefinition<\/h3>\n<p>AbstractBeanDefinition \u662f\u4e00\u4e2a\u62bd\u8c61\u7c7b\uff0c\u5b83\u6839\u636e BeanDefinition \u4e2d\u5b9a\u4e49\u7684\u63a5\u53e3\u63d0\u4f9b\u4e86\u76f8\u5e94\u7684\u5c5e\u6027\uff0c\u5e76\u5b9e\u73b0\u4e86 BeanDefinition \u4e2d\u5b9a\u4e49\u7684\u4e00\u90e8\u5206\u65b9\u6cd5\u3002BeanDefinition \u4e2d\u539f\u672c\u53ea\u662f\u5b9a\u4e49\u4e86\u4e00\u7cfb\u5217\u7684 get\/set \u65b9\u6cd5\uff0c\u5e76\u6ca1\u6709\u63d0\u4f9b\u5bf9\u5e94\u7684\u5c5e\u6027\uff0c\u5728 AbstractBeanDefinition \u4e2d\u5c06\u6240\u6709\u7684\u5c5e\u6027\u5b9a\u4e49\u51fa\u6765\u4e86\u3002<\/p>\n<p>\u540e\u9762\u5176\u4ed6\u7684\u5b9e\u73b0\u7c7b\u4e5f\u57fa\u672c\u4e0a\u90fd\u662f\u5728 AbstractBeanDefinition \u7684\u57fa\u7840\u4e0a\u5b8c\u6210\u7684\u3002<\/p>\n<h3>2.2 RootBeanDefinition<\/h3>\n<p>\u8fd9\u662f\u4e00\u4e2a\u6bd4\u8f83\u5e38\u7528\u7684\u5b9e\u73b0\u7c7b\uff0c\u5bf9\u5e94\u4e86\u4e00\u822c\u7684\u5143\u7d20\u6807\u7b7e\u3002<\/p>\n<h3>2.3 ChildBeanDefinition<\/h3>\n<p>\u53ef\u4ee5\u8ba9\u5b50 BeanDefinition \u5b9a\u4e49\u62e5\u6709\u4ece\u7236 BeanDefinition \u90a3\u91cc\u7ee7\u627f\u914d\u7f6e\u7684\u80fd\u529b\uff0c\u5982\u679c\u5b50 Bean \u4ece\u7236 Bean \u83b7\u53d6\u914d\u7f6e\uff0c\u53ef\u4ee5\u53c2\u8003\u677e\u54e5\u4e4b\u524d\u7684\u8fd9\u7bc7\u6587\u7ae0\uff1a<a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=xQPYwr9At2E%2B8BXleRTa%2Fg%3D%3D.lojT8m25Zk8jXe7eHQEDjnF0HUfCmS8g5mKaDpHx8V9gbLq3EGF8HvAHLEMSGI2FvCCi2%2F7oi995CAwQtdAuPA%3D%3D\" rel=\"noopener noreferrer\">Spring BeanDefinition \u4e5f\u5206\u7236\u5b50\uff1f<\/a>\u3002<\/p>\n<h3>2.4 GenericBeanDefinition<\/h3>\n<p>GenericBeanDefinition \u662f\u4ece Spring2.5 \u4ee5\u540e\u65b0\u52a0\u5165\u7684 BeanDefinition \u5b9e\u73b0\u7c7b\u3002GenericBeanDefinition \u53ef\u4ee5\u52a8\u6001\u8bbe\u7f6e\u7236 Bean\uff0c\u540c\u65f6\u517c\u5177 RootBeanDefinition \u548c ChildBeanDefinition \u7684\u529f\u80fd\uff0c\u56e0\u6b64\uff0c\u81ea\u4ece\u6709\u4e86 GenericBeanDefinition \u4e4b\u540e\uff0cRootBeanDefinition \u548c ChildBeanDefinition \u73b0\u5728\u76f8\u5bf9\u5c31\u7528\u7684\u5c11\u4e86\u3002<\/p>\n<h3>2.5 AnnotatedBeanDefinition<\/h3>\n<p>\u8fd9\u4e2a\u8868\u793a\u6ce8\u89e3\u7c7b\u578b BeanDefinition\uff0c\u7528\u4e8e\u8868\u793a\u901a\u8fc7\u6ce8\u89e3\u914d\u7f6e\u7684 Bean \u5b9a\u4e49\u3002\u901a\u8fc7 AnnotatedBeanDefinition\uff0c\u6211\u4eec\u53ef\u4ee5\u83b7\u53d6\u5230\u88ab\u6ce8\u89e3\u7684 Bean \u7684\u76f8\u5173\u4fe1\u606f\uff0c\u5305\u62ec\u6ce8\u89e3\u7c7b\u578b\u3001\u5c5e\u6027\u503c\u3001\u65b9\u6cd5\u7b49\u3002\u8fd9\u4e2a\u63a5\u53e3\u63d0\u4f9b\u4e86\u4e00\u79cd\u65b9\u4fbf\u7684\u65b9\u5f0f\u6765\u5904\u7406\u901a\u8fc7\u6ce8\u89e3\u65b9\u5f0f\u914d\u7f6e\u7684 Bean\uff0c\u5e76\u4e14\u53ef\u4ee5\u5728\u8fd0\u884c\u65f6\u52a8\u6001\u5730\u83b7\u53d6\u548c\u64cd\u4f5c\u8fd9\u4e9b\u6ce8\u89e3\u4fe1\u606f\uff0c\u5f53\u7136\uff0c\u8fd9\u662f\u4e00\u4e2a\u63a5\u53e3\uff0c\u5b83\u6709\u4e09\u4e2a\u5b9e\u73b0\u7c7b\uff0c\u5206\u522b\u662f AnnotatedGenericBeanDefinition\u3001ScannedGenericBeanDefinition \u4ee5\u53ca ConfigurationClassBeanDefinition\u3002<\/p>\n<h3>2.6 AnnotatedGenericBeanDefinition<\/h3>\n<p>\u4f5c\u4e3a\u7cfb\u7edf\u914d\u7f6e\u7c7b\u7684\u7c7b\u4f1a\u89e3\u6790\u4e3a AnnotatedGenericBeanDefinition\u3002<\/p>\n<h3>2.7 ScannedGenericBeanDefinition<\/h3>\n<p>\u8fd9\u4e2a\u662f\u901a\u8fc7\u5305\u626b\u63cf\u81ea\u52a8\u6ce8\u518c\u7684 Bean\uff0c\u5c31\u4f1a\u88ab\u89e3\u6790\u4e3a ScannedGenericBeanDefinition\u3002<\/p>\n<h3>2.8 ConfigurationClassBeanDefinition<\/h3>\n<p>\u8fd9\u662f\u4e00\u4e2a\u79c1\u6709\u7684\u5185\u90e8\u7c7b\u3002\u6211\u4eec\u901a\u8fc7 @Bean \u6ce8\u89e3\u5b9a\u4e49\u7684 Bean\uff0c\u6700\u7ec8\u4f1a\u88ab\u89e3\u6790\u4e3a ConfigurationClassBeanDefinition\u3002<\/p>\n<h3>2.9 ClassDerivedBeanDefinition<\/h3>\n<p>ClassDerivedBeanDefinition \u7684\u4f5c\u7528\u662f\u6269\u5c55\u5e76\u63cf\u8ff0\u4e00\u4e2a\u7c7b\u6d3e\u751f\u7684Bean\u7684\u5143\u6570\u636e\u3002\u5b83\u662f AnnotatedBeanDefinition \u63a5\u53e3\u7684\u4e00\u4e2a\u5b9e\u73b0\u7c7b\uff0c\u5728 Spring \u6846\u67b6\u4e2d\u7528\u4e8e\u8868\u793a\u901a\u8fc7\u7c7b\u6d3e\u751f\u65b9\u5f0f\u914d\u7f6e\u7684Bean\u5b9a\u4e49\u3002<\/p>\n<h3>2.10 CreateFromClassBeanDefinition<\/h3>\n<p>\u8fd9\u4e2a\u662f\u6309\u7167\u7c7b\u578b\u521b\u5efa Bean \u7684\u65f6\u5019\u4f1a\u7528\u5230\u3002<\/p>\n<p>\u5dee\u4e0d\u591a\u5c31\u8fd9\u4e48\u591a\u4e86\uff0c\u5927\u90e8\u5206\u6211\u4eec\u65e5\u5e38\u5f00\u53d1\u4e2d\u5176\u5b9e\u90fd\u7528\u4e0d\u4e0a\uff0c\u63a5\u4e0b\u6765\u677e\u54e5\u901a\u8fc7\u51e0\u4e2a\u5177\u4f53\u7684\u6848\u4f8b\u6765\u548c\u5c0f\u4f19\u4f34\u4eec\u6f14\u793a\u8fd9\u4e9b BeanDefinition \u7684\u5177\u4f53\u7528\u6cd5\u3002\u540e\u9762\u7684\u6587\u7ae0\uff0c\u6211\u4eec\u518d\u6765\u5206\u6790\u8fd9\u4e9b BeanDefinition \u5728 Spring \u6e90\u7801\u4e2d\u662f\u5982\u4f55\u5e94\u7528\u7684\u3002<\/p>\n<h2>3.\u5b9e\u8df5<\/h2>\n<p>\u63a5\u4e0b\u6765\u6211\u901a\u8fc7\u51e0\u4e2a\u5177\u4f53\u7684\u6848\u4f8b\u6765\u548c\u5c0f\u4f19\u4f34\u4eec\u6f14\u793a\u5404\u79cd\u4e0d\u540c\u7684 BeanDefinition \u7684\u7528\u6cd5\uff0c\u4eca\u5929\u6211\u4e3b\u8981\u548c\u5c0f\u4f19\u4f34\u4eec\u6f14\u793a\u6211\u4eec\u7eaf\u624b\u52a8\u4f7f\u7528 BeanDefinition\uff0c\u7136\u540e\u5206\u6790\u4e00\u4e0b\u6211\u4eec\u5e73\u65f6\u7684\u914d\u7f6e\u672c\u8d28\u4e0a\u4f7f\u7528\u7684 BeanDefinition \u662f\u54ea\u4e00\u4e2a\uff0c\u4eca\u5929\u6211\u4eec\u5148\u4e0d\u53bb\u6e90\u7801\u5206\u6790\uff0c\u5355\u7eaf\u7684\u5c31\u770b\u770b\u6548\u679c\u3002<\/p>\n<h3>3.1 GenericBeanDefinition<\/h3>\n<p>\u5148\u6765\u770b GenericBeanDefinition\uff0c\u8fd9\u4e2a\u529f\u80fd\u76f8\u5bf9\u6bd4\u8f83\u5168\uff0c\u517c\u5177 RootBeanDefinition \u548c ChildBeanDefinition \u7684\u80fd\u529b\u3002<\/p>\n<p>\u5148\u6765\u770b\u4e00\u4e2a\u7b80\u5355\u7528\u6cd5\uff1a<\/p>\n<pre><code class=\"java\">DefaultListableBeanFactory beanFactory = new DefaultListableBeanFactory();\nGenericBeanDefinition bd = new GenericBeanDefinition();\nbd.setBeanClass(User.class);\nMutablePropertyValues pValues = new MutablePropertyValues();\npValues.add(&quot;username&quot;, &quot;javaboy&quot;);\nbd.setPropertyValues(pValues);\nbeanFactory.registerBeanDefinition(&quot;user&quot;, bd);\nUser user = beanFactory.getBean(&quot;user&quot;, User.class);\nSystem.out.println(&quot;user = &quot; + user);<\/code><\/pre>\n<p>\u5c0f\u4f19\u4f34\u4eec\u770b\u5230\uff0c\u6211\u4eec\u8fd9\u91cc\u5411 Spring \u5bb9\u5668\u6ce8\u518c\u4e86\u4e00\u4e2a GenericBeanDefinition \u7c7b\u578b\u7684 BeanDefinition\uff0cGenericBeanDefinition \u4e2d\u5305\u542b\u4e86\u5177\u4f53\u7684 class \u4ee5\u53ca Bean \u7684\u5404\u4e2a\u5c5e\u6027\u503c\u3002<\/p>\n<p>\u5982\u679c\u6211\u4eec\u5728 Bean \u5b9a\u4e49\u7684\u65f6\u5019\uff0c\u60f3\u8981\u4f7f\u7528\u7ee7\u627f\u7279\u6027\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528 GenericBeanDefinition\uff1a<\/p>\n<pre><code class=\"java\">DefaultListableBeanFactory beanFactory = new DefaultListableBeanFactory();\nGenericBeanDefinition parentBD = new GenericBeanDefinition();\nGenericBeanDefinition childBD = new GenericBeanDefinition();\nparentBD.setBeanClass(Animal.class);\nMutablePropertyValues pValues = new MutablePropertyValues();\npValues.add(&quot;name&quot;, &quot;\u5c0f\u9ec4&quot;);\nparentBD.setPropertyValues(pValues);\nchildBD.setBeanClass(Dog.class);\nchildBD.setParentName(&quot;animal&quot;);\nbeanFactory.registerBeanDefinition(&quot;animal&quot;, parentBD);\nbeanFactory.registerBeanDefinition(&quot;dog&quot;, childBD);\nDog dog = beanFactory.getBean(&quot;dog&quot;, Dog.class);\nSystem.out.println(&quot;dog = &quot; + dog);<\/code><\/pre>\n<p>\u8fd9\u6b21\u6211\u76f4\u63a5\u5b9a\u4e49\u4e86\u4e24\u4e2a GenericBeanDefinition\uff0c\u4e00\u4e2a\u4f5c\u4e3a parent\uff0c\u53e6\u5916\u4e00\u4e2a\u4f5c\u4e3a child\uff0c\u4e3a child \u8bbe\u7f6e parentName\uff0c\u5219 child \u53ef\u4ee5\u7ee7\u627f parent \u4e2d\u7684\u5c5e\u6027\u3002\u4e0a\u9762\u7684\u6848\u4f8b\u4e2d\uff0c\u6700\u7ec8\u6253\u5370\u51fa\u6765 dog \u7684 name \u5c5e\u6027\u5c31\u662f <strong>\u5c0f\u9ec4<\/strong>\uff0c\u8fd9\u5757\u5c0f\u4f19\u4f34\u4eec\u53ef\u4ee5\u53c2\u8003\u677e\u54e5\u4e4b\u524d\u7684\u6587\u7ae0\uff1a<a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=giT8uX4TcNc6XjHkU95hYw%3D%3D.wgjJuNGxYD9N8nGZ7KjFnI2tl5mHAqonA9ZwSVa9URye1w27Fxe%2BFdRQ0pJUAlfVJYcj5WlicVKP8C8rU3eMVw%3D%3D\" rel=\"noopener noreferrer\">Spring BeanDefinition \u4e5f\u5206\u7236\u5b50\uff1f<\/a>\u3002<\/p>\n<p>\u6211\u4eec\u5e73\u65f6\u901a\u8fc7 XML \u6587\u4ef6\u5b9a\u4e49\u7684 Bean\uff0c\u6700\u7ec8\u89e3\u6790\u540e\u5c31\u662f GenericBeanDefinition\u3002<\/p>\n<p>\u4f8b\u5982\u4e0b\u9762\u8fd9\u6837\uff1a<\/p>\n<pre><code class=\"xml\">&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;\n&lt;beans xmlns=&quot;http:\/\/www.springframework.org\/schema\/beans&quot;\n       xmlns:xsi=&quot;http:\/\/www.w3.org\/2001\/XMLSchema-instance&quot;\n       xsi:schemaLocation=&quot;http:\/\/www.springframework.org\/schema\/beans http:\/\/www.springframework.org\/schema\/beans\/spring-beans.xsd&quot;&gt;\n\n    &lt;bean class=&quot;org.javaboy.demo.User&quot; id=&quot;user&quot;&gt;&lt;\/bean&gt;\n&lt;\/beans&gt;<\/code><\/pre>\n<p>\u52a0\u8f7d XML \u6587\u4ef6\uff0c\u521b\u5efa\u5bb9\u5668\uff1a<\/p>\n<pre><code class=\"java\">ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext(&quot;beans.xml&quot;);\nString[] beanDefinitionNames = ctx.getBeanDefinitionNames();\nfor (String beanDefinitionName : beanDefinitionNames) {\n    BeanDefinition bd = ctx.getBeanFactory().getBeanDefinition(beanDefinitionName);\n    System.out.println(beanDefinitionName + &quot;&gt;&gt;&gt;&quot; + bd.getClass());\n}<\/code><\/pre>\n<p>\u6700\u7ec8\u6253\u5370\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044194109\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<p>\u8fd9\u4e2a\u4e5f\u597d\u7406\u89e3\uff0c\u6bd5\u7adf\u6211\u4eec\u5728 XML \u4e2d\u914d\u7f6e\u7684\u65f6\u5019\uff0c\u53ef\u80fd\u5b58\u5728 parent\uff0c\u4e5f\u53ef\u80fd\u4e0d\u5b58\u5728\uff0c\u7528 GenericBeanDefinition \u5c31\u80fd\u591f\u5e94\u5bf9\u5404\u79cd\u60c5\u51b5\u3002<\/p>\n<h3>3.2 RootBeanDefinition\/ChildBeanDefinition<\/h3>\n<p>\u8fd9\u4e24\u4e2a\u5e38\u89c4\u7684\u529f\u80fd\u5176\u5b9e\u90fd\u6709\uff0c\u4f46\u662f RootBeanDefinition \u4e00\u822c\u53ef\u4ee5\u7528\u6765\u505a parent\uff0c\u4e0d\u80fd\u7528\u4f5c child\uff0c\u5373\u7ed9 RootBeanDefinition \u4e0d\u80fd\u914d\u7f6e parentName \u5c5e\u6027\u3002\u5f3a\u884c\u8bbe\u7f6e\u4f1a\u629b\u51fa\u5982\u4e0b\u5f02\u5e38\uff1a<\/p>\n<pre><code class=\"java\">@Override\npublic void setParentName(@Nullable String parentName) {\n    if (parentName != null) {\n        throw new IllegalArgumentException(&quot;Root bean cannot be changed into a child bean with parent reference&quot;);\n    }\n}<\/code><\/pre>\n<p>ChildBeanDefinition \u5219\u65e2\u53ef\u4ee5\u505a parent \u4e5f\u53ef\u4ee5\u505a child\uff0c\u4f46\u662f ChildBeanDefinition \u5728\u4f7f\u7528\u7684\u4f7f\u7528\u5fc5\u987b\u6307\u5b9a parent\uff0c\u5373\u4f7f ChildBeanDefinition \u4f5c\u4e3a parent\uff0c\u4e5f\u5fc5\u987b\u6307\u5b9a parent\uff0c\u6240\u4ee5 ChildBeanDefinition \u5728\u4f7f\u7528\u7684\u8fc7\u7a0b\u4e2d\u6709\u4e00\u70b9\u70b9\u5c40\u9650\u6027\uff0c\u56e0\u6b64\u76ee\u524d\u88ab GenericBeanDefinition \u4ee3\u66ff\u4e86\u3002<\/p>\n<p>\u6765\u770b\u4e00\u4e2a\u7b80\u5355\u7684\u6848\u4f8b\uff1a<\/p>\n<pre><code class=\"java\">DefaultListableBeanFactory beanFactory = new DefaultListableBeanFactory();\nRootBeanDefinition parentBD = new RootBeanDefinition();\nparentBD.setBeanClass(Animal.class);\nMutablePropertyValues pValues = new MutablePropertyValues();\npValues.add(&quot;name&quot;, &quot;\u5c0f\u9ec4&quot;);\nparentBD.setPropertyValues(pValues);\nChildBeanDefinition childBD = new ChildBeanDefinition(&quot;animal&quot;);\nchildBD.setBeanClass(Dog.class);\nbeanFactory.registerBeanDefinition(&quot;animal&quot;, parentBD);\nbeanFactory.registerBeanDefinition(&quot;dog&quot;, childBD);\nDog dog = beanFactory.getBean(&quot;dog&quot;, Dog.class);\nSystem.out.println(&quot;dog = &quot; + dog);<\/code><\/pre>\n<h3>3.3 AnnotatedGenericBeanDefinition<\/h3>\n<p>\u5bf9\u4e8e\u4f7f\u7528 @Configuration \u6ce8\u89e3\u6807\u8bb0\u7684\u7c7b\uff0c\u6700\u7ec8\u89e3\u6790\u51fa\u6765\u7684 BeanDefinition \u5c31\u662f AnnotatedGenericBeanDefinition\u3002\u4f8b\u5982\u6211\u6709\u4e00\u4e2a\u914d\u7f6e\u7c7b\u5982\u4e0b\uff1a<\/p>\n<pre><code class=\"java\">@Configuration\npublic class JavaConfig {\n\n}<\/code><\/pre>\n<p>\u52a0\u8f7d\u914d\u7f6e\u7c7b\u5e76\u542f\u52a8\u5bb9\u5668\uff1a<\/p>\n<pre><code class=\"java\">AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext(JavaConfig.class);\nString[] beanDefinitionNames = ctx.getBeanDefinitionNames();\nfor (String beanDefinitionName : beanDefinitionNames) {\n    BeanDefinition beanDefinition = ctx.getBeanFactory().getBeanDefinition(beanDefinitionName);\n    System.out.println(beanDefinitionName + &quot; &gt;&gt;&gt; &quot; + beanDefinition.getClass());\n}<\/code><\/pre>\n<p>\u6700\u7ec8\u6253\u5370\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044194110\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<h3>3.4 ScannedGenericBeanDefinition<\/h3>\n<p>\u8fd9\u4e2a\u662f\u90a3\u4e9b\u901a\u8fc7\u5305\u626b\u63cf\u6ce8\u518c\u5230 Spring \u5bb9\u5668\u4e2d\u7684 Bean\uff0c\u5728\u4e00\u5f00\u59cb\u5b9a\u4e49\u51fa\u6765\u7684 BeanDefinition \u5c31\u662f ScannedGenericBeanDefinition\u3002<\/p>\n<p>\u4f8b\u5982\u6211\u6709\u5982\u4e0b Bean\uff1a<\/p>\n<pre><code class=\"java\">@Service\npublic class UserService {\n\n}<\/code><\/pre>\n<p>\u7136\u540e\u914d\u7f6e\u5305\u626b\u63cf\uff1a<\/p>\n<pre><code class=\"java\">@Configuration\n@ComponentScan\npublic class JavaConfig {\n}<\/code><\/pre>\n<p>\u542f\u52a8\u5bb9\u5668\uff1a<\/p>\n<pre><code class=\"java\">AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext(JavaConfig.class);\nString[] beanDefinitionNames = ctx.getBeanDefinitionNames();\nfor (String beanDefinitionName : beanDefinitionNames) {\n    BeanDefinition beanDefinition = ctx.getBeanFactory().getBeanDefinition(beanDefinitionName);\n    System.out.println(beanDefinitionName + &quot; &gt;&gt;&gt; &quot; + beanDefinition.getClass());\n}<\/code><\/pre>\n<p>\u6700\u7ec8\u6253\u5370\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044194111\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<h3>3.5 ConfigurationClassBeanDefinition<\/h3>\n<p>\u5f53\u6211\u4eec\u901a\u8fc7 @Bean \u6ce8\u89e3\u53bb\u5b9a\u4e49 Bean \u7684\u65f6\u5019\uff0c\u90a3\u4e48\u88ab @Bean \u6ce8\u89e3\u6807\u8bb0\u7684\u7c7b\u5c31\u4f1a\u88ab\u89e3\u6790\u4e3a ConfigurationClassBeanDefinition\u3002<\/p>\n<p>\u4f8b\u5982\u4e0b\u9762\u8fd9\u4e2a\u4f8b\u5b50\uff1a<\/p>\n<pre><code class=\"java\">@Configuration\npublic class JavaConfig {\n    @Bean\n    User user() {\n        return new User();\n    }\n}<\/code><\/pre>\n<p>\u67e5\u770b\u89e3\u6790\u540e\u7684 BeanDefinition \u5982\u4e0b\uff1a<\/p>\n<p><img decoding=\"async\"   referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000044194112\" alt=\"\" title=\"\" loading=\"lazy\"><\/p>\n<h3>3.6 CreateFromClassBeanDefinition<\/h3>\n<p>\u8fd9\u4e2a\u5176\u5b9e\u7528\u7684\u5c11\uff0c\u4f46\u662f\u54b1\u4e48\u65e2\u7136\u8bb2\u5230 Spring\uff0c\u677e\u54e5\u4e5f\u8bf4\u4e24\u53e5\u3002<\/p>\n<p>\u8fd9\u4e2a\u662f\u5f53\u6211\u4eec\u60f3\u8981\u521b\u5efa\u4e00\u4e2a\u5bf9\u8c61\uff0c\u6211\u4eec\u5e0c\u671b\u8fd9\u4e2a\u5bf9\u8c61\u80fd\u591f\u81ea\u52a8\u8d70\u4e00\u904d Spring \u4e2d\u7684\u5404\u79cd\u540e\u7f6e\u5904\u7406\u5668\u7684\u65f6\u5019\uff0c\u90a3\u4e48\u53ef\u4ee5\u8c03\u7528 createBean \u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u5185\u90e8\u4f7f\u7528\u4e86 CreateFromClassBeanDefinition\u3002<\/p>\n<p>\u4f8b\u5982\u5982\u4e0b\u4ee3\u7801\uff1a<\/p>\n<pre><code class=\"java\">AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext(JavaConfig.class);\nConfigurableListableBeanFactory beanFactory = ctx.getBeanFactory();\nUser user = beanFactory.createBean(User.class);\nSystem.out.println(&quot;user = &quot; + user);<\/code><\/pre>\n<p>\u4f7f\u7528\u8fd9\u79cd\u65b9\u5f0f\u53bb\u521b\u5efa\u4e00\u4e2a Bean\uff0c\u8fd9\u4e2a Bean \u4f1a\u8d70\u4e00\u904d Spring \u4e2d Bean \u7684\u540e\u7f6e\u5904\u7406\u5668\uff0c\u5176\u4e2d\uff0ccreateBean \u65b9\u6cd5\u7684\u5185\u90e8\u5c31\u4f7f\u7528\u4e86 CreateFromClassBeanDefinition\u3002<\/p>\n<h3>3.7 ClassDerivedBeanDefinition<\/h3>\n<p>ClassDerivedBeanDefinition \u548c CreateFromClassBeanDefinition \u5176\u5b9e\u6bd4\u8f83\u50cf\uff0c\u5dee\u522b\u5728\u4e8e\u4e8c\u8005\u5904\u7406\u6784\u9020\u65b9\u6cd5\u7684\u65b9\u5f0f\u4e0d\u540c\u3002<\/p>\n<p>\u800c\u4e14 ClassDerivedBeanDefinition \u662f\u4e00\u4e2a\u76f8\u5f53\u51b7\u95e8\u7684 BeanDefinition\uff0c\u5728 GenericApplicationContext \u7684\u5b9e\u73b0\u7c7b\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 GenericXmlApplicationContext\u3001StaticApplicationContext \u6216\u8005 GenericGroovyApplicationContext\uff0c\u53ea\u6709\u8fd9\u4e09\u4e2a\u7c7b\u4e2d registerBean \u65b9\u6cd5\u7528\u5230\u4e86 ClassDerivedBeanDefinition\uff0c\u6211\u4eec\u5e38\u89c1\u7684 AnnotationConfigApplicationContext \u7531\u4e8e\u65b9\u6cd5\u91cd\u5199\u7684\u7f18\u6545\u5e76\u672a\u4f7f\u7528 ClassDerivedBeanDefinition\u3002<\/p>\n<pre><code class=\"java\">StaticApplicationContext ctx = new StaticApplicationContext();\nctx.registerBean(User.class,()-&gt;{\n    User user = new User();\n    user.setUsername(&quot;javaboy&quot;);\n    return user;\n});\nUser user = ctx.getBean(User.class);\nSystem.out.println(&quot;user = &quot; + user);\nString[] beanDefinitionNames = ctx.getBeanDefinitionNames();\nfor (String beanDefinitionName : beanDefinitionNames) {\n    BeanDefinition bd = ctx.getBeanDefinition(beanDefinitionName);\n    System.out.println(beanDefinitionName + &quot;&gt;&gt;&gt;&quot; + bd.getClass());\n}<\/code><\/pre>\n<p>\u6211\u4eec\u53ef\u4ee5\u8c03\u7528 registerBean \u65b9\u6cd5\u5411 Spring \u5bb9\u5668\u4e2d\u6ce8\u5165\u4e00\u4e2a Bean\uff0c\u8be5\u65b9\u6cd5\u7b2c\u4e8c\u4e2a\u53c2\u6570\u662f\u4e00\u4e2a Bean \u7684\u751f\u4ea7\u8005\uff0c\u5982\u679c\u4e0d\u6307\u5b9a\u751f\u4ea7\u8005\uff0c\u90a3\u4e48\u8fd9\u4e2a\u65b9\u6cd5\u6700\u7ec8\u5c31\u662f\u901a\u8fc7\u7b2c\u4e00\u4e2a\u53c2\u6570\u53cd\u5c04\u521b\u5efa Bean\uff0cregisterBean \u65b9\u6cd5\u7684\u5185\u90e8\u5c31\u662f\u4f7f\u7528\u4e86 ClassDerivedBeanDefinition\u3002<\/p>\n<p>\u597d\u5566\uff0cBeanDefinition \u4e00\u5171\u5c31\u662f\u8fd9\u4e03\u79cd\uff0c\u63a5\u4e0b\u6765\u6211\u4f1a\u901a\u8fc7\u51e0\u7bc7\u6587\u7ae0\u548c\u5927\u5bb6\u91cd\u70b9\u4ecb\u7ecd GenericBeanDefinition\u3001AnnotatedGenericBeanDefinition\u3001ScannedGenericBeanDefinition \u4ee5\u53ca ConfigurationClassBeanDefinition \u8fd9\u56db\u79cd\u6700\u4e3a\u5e38\u89c1\u7684 BeanDefinition\u3002<\/p>\n<p><a href=\"https:\/\/segmentfault.com\/a\/1190000044194105\">https:\/\/segmentfault.com\/a\/1190000044194105<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u805a\u6c99\u6210\u5854\uff01\u4e0d\u77e5\u4e0d\u89c9 Spring \u6e90\u7801\u5df2\u7ecf\u8fde\u7eed\u66f4\u4e86\u4e24\u4e2a\u6708\u5566\uff0c\u89c6\u9891\u4e5f\u5f55\u5236\u4e86\u4e0d\u5c11\u4e86\uff0c\u5bf9 Spring \u6e90\u7801\u5206\u6790\u611f\u5174 [&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-10008249","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\/10008249","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=10008249"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10008249\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10008249"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10008249"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10008249"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}