{"id":10008102,"date":"2023-08-16T15:59:05","date_gmt":"2023-08-16T07:59:05","guid":{"rendered":"http:\/\/ityet.com\/?p=10008102"},"modified":"2023-08-16T15:59:05","modified_gmt":"2023-08-16T07:59:05","slug":"spring-beandefinition-%e4%b9%9f%e5%88%86%e7%88%b6%e5%ad%90%e5%85%b3%e7%b3%bb%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10008102","title":{"rendered":"Spring BeanDefinition \u4e5f\u5206\u7236\u5b50\u5173\u7cfb\uff1f"},"content":{"rendered":"

\u5728 Spring \u6846\u67b6\u4e2d\uff0cBeanDefinition \u662f\u4e00\u4e2a\u6838\u5fc3\u6982\u5ff5\uff0c\u7528\u4e8e\u5b9a\u4e49\u548c\u914d\u7f6e bean \u7684\u5143\u6570\u636e\uff0c\u867d\u7136\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u6211\u4eec\u4e00\u822c\u5e76\u4e0d\u4f1a\u6216\u8005\u5f88\u5c11\u76f4\u63a5\u5b9a\u4e49 BeanDefinition\uff0c\u4f46\u662f\uff0c\u6211\u4eec\u5728 XML \u6587\u4ef6\u4e2d\u6240\u4f5c\u7684\u914d\u7f6e\uff0c\u4ee5\u53ca\u5229\u7528 Java \u4ee3\u7801\u505a\u7684\u5404\u79cd Spring \u914d\u7f6e\uff0c\u90fd\u4f1a\u88ab\u89e3\u6790\u4e3a BeanDefinition\uff0c\u7136\u540e\u624d\u4f1a\u505a\u8fdb\u4e00\u6b65\u7684\u5904\u7406\u3002BeanDefinition \u5141\u8bb8\u5f00\u53d1\u4eba\u5458\u4ee5\u4e00\u79cd\u58f0\u660e\u6027\u7684\u65b9\u5f0f\u5b9a\u4e49\u548c\u7ec4\u7ec7 bean\uff0c\u8fd9\u91cc\u6709\u5f88\u591a\u5c5e\u6027\uff0c\u4eca\u5929\u677e\u54e5\u5355\u7eaf\u7684\u6765\u548c\u5c0f\u4f19\u4f34\u4eec\u804a\u4e00\u804a\u5b83\u7684 parentName \u5c5e\u6027\uff0cparentName \u5c5e\u6027\u5728 BeanDefinition \u4e2d\u626e\u6f14\u7740\u91cd\u8981\u7684\u89d2\u8272\uff0c\u7528\u4e8e\u5efa\u7acb bean \u4e4b\u95f4\u7684\u7236\u5b50\u5173\u7cfb\u3002<\/p>\n

\u4e4b\u524d\u677e\u54e5\u6709\u4e00\u7bc7\u6587\u7ae0\u548c\u5c0f\u4f19\u4f34\u4eec\u804a\u4e86 BeanFactory \u4e4b\u95f4\u7684\u7236\u5b50\u5173\u7cfb\uff08Spring \u4e2d\u7684\u7236\u5b50\u5bb9\u5668\u662f\u548b\u56de\u4e8b\uff1f<\/a>\uff09\uff0c\u5927\u5bb6\u6ce8\u610f\u548c\u4eca\u5929\u7684\u5185\u5bb9\u8fdb\u884c\u533a\u5206\uff0c\u4eca\u5929\u6211\u4eec\u804a\u7684\u662f BeanDefinition \u4e4b\u95f4\u7684\u7236\u5b50\u5173\u7cfb\u3002<\/p><\/blockquote>\n

BeanDefinition \u7684 parentName \u5c5e\u6027\u7684\u4e3b\u8981\u529f\u80fd\u662f\u5141\u8bb8\u6211\u4eec\u5728\u521b\u5efa\u4e00\u4e2a bean \u7684\u540c\u65f6\uff0c\u80fd\u591f\u7ee7\u627f\u53e6\u4e00\u4e2a\u5df2\u7ecf\u5b9a\u4e49\u597d\u7684 bean\u3002\u901a\u8fc7\u6307\u5b9a parentName \u5c5e\u6027\uff0c\u6211\u4eec\u53ef\u4ee5\u91cd\u7528\u5df2\u6709 bean \u7684\u914d\u7f6e\uff0c\u5e76\u5728\u6b64\u57fa\u7840\u4e0a\u8fdb\u884c\u4fee\u6539\u6216\u6269\u5c55\u3002<\/p>\n

\u5148\u4e0d\u5e9f\u8bdd\u4e86\uff0c\u6211\u5148\u6765\u4e3e\u4e24\u4e2a\u4f8b\u5b50\uff0c\u5c0f\u4f19\u4f34\u4eec\u5148\u611f\u53d7\u4e00\u4e0b BeanDefinition \u7684\u4f5c\u7528\u3002<\/p>\n

1. \u5b9e\u8df5<\/h2>\n

\u5047\u8bbe\u6211\u6709\u5982\u4e0b\u4e24\u4e2a\u7c7b\uff0c\u9996\u5148\u662f\u4e00\u4e2a\u52a8\u7269\u7684\u57fa\u7c7b\uff0c\u5982\u4e0b\uff1a<\/p>\n

public class Animal {\n    private String name;\n    private Integer age;\n    \/\/\u7701\u7565 getter\/setter\n}<\/code><\/pre>\n
\u7136\u540e\u6709\u4e00\u4e2a Dog \u7c7b\uff0c\u5982\u4e0b\uff1a<\/p>\n
public class Dog {\n    private String name;\n    private Integer age;\n    private String color;\n    \/\/\u7701\u7565 getter\/setter\n}<\/code><\/pre>\n
\u5c0f\u4f19\u4f34\u4eec\u6ce8\u610f\uff0c\u8fd9\u91cc\u7684 Dog \u7c7b\u5e76\u6ca1\u6709\u7ee7\u627f\u81ea Animal \u7c7b\uff0c\u4f46\u662f\u6709\u4e24\u4e2a\u8ddf Animal \u540c\u540d\u7684\u5c5e\u6027\u3002\u4e4b\u6240\u4ee5\u8fd9\u6837\u8bbe\u8ba1\u662f\u5e0c\u671b\u5c0f\u4f19\u4f34\u4eec\u7406\u89e3 BeanDefinition \u4e2d\u7684 parentName \u5c5e\u6027\u548c Java \u4e2d\u7684\u7ee7\u627f\u5e76\u65e0\u5173\u7cfb\uff0c\u867d\u7136\u5927\u90e8\u5206\u60c5\u51b5\u4e0b\u6211\u4eec\u7528\u5230 parentName \u7684\u65f6\u5019\uff0cJava \u4e2d\u76f8\u5173\u7684\u7c7b\u90fd\u662f\u7ee7\u627f\u5173\u7cfb\u3002<\/p><\/blockquote>\n
\u73b0\u5728\uff0c\u6709\u4e00\u4e9b\u901a\u7528\u7684\u5c5e\u6027\u6211\u60f3\u5728 Animal \u4e2d\u8fdb\u884c\u914d\u7f6e\uff0cDog \u4e2d\u7279\u6709\u7684\u5c5e\u6027\u5219\u5728 Dog \u4e2d\u8fdb\u884c\u914d\u7f6e\uff0c\u6211\u4eec\u6765\u770b\u4e0b\u901a\u8fc7 XML \u548c Java \u5206\u522b\u8be5\u5982\u4f55\u914d\u7f6e\u3002<\/p>\n
1.1 XML \u914d\u7f6e<\/h3>\n
<bean id="animal" class="org.javaboy.demo.p2.Animal">\n    <property name="name" value="\u5c0f\u9ed1"\/>\n    <property name="age" value="3"\/>\n<\/bean>\n<bean class="org.javaboy.demo.p2.Dog" id="dog" parent="animal">\n    <property name="color" value="\u9ed1\u8272"\/>\n<\/bean><\/code><\/pre>\n
\u5c0f\u4f19\u4f34\u4eec\u770b\u5230\uff0c\u9996\u5148\u6211\u4eec\u914d\u7f6e Animal\uff0cAnimal \u4e2d\u6709 name \u548c age \u4e24\u4e2a\u5c5e\u6027\uff0c\u7136\u540e\u6211\u53c8\u914d\u7f6e\u4e86 Dog Bean\uff0c\u5e76\u672a\u4e4b\u6307\u5b9a\u4e86 parent \u4e3a animal\uff0c\u7136\u540e\u7ed9 Dog \u8bbe\u7f6e\u4e86 color \u5c5e\u6027\u3002<\/p>\n
\u73b0\u5728\uff0cDog Bean \u5b9a\u4e49\u51fa\u6765\u7684 BeanDefinition \u4e2d\u5c06\u6765\u5c31\u5305\u542b\u4e86 animal \u4e2d\u7684\u5c5e\u6027\u503c\u3002<\/p>\n
1.2 Java \u914d\u7f6e<\/h3>\n
\u518d\u6765\u770b\u770b Java \u914d\u7f6e\u8be5\u5982\u4f55\u5199\u3002<\/p>\n
AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();\nRootBeanDefinition pbd = new RootBeanDefinition();\nMutablePropertyValues pValues = new MutablePropertyValues();\npValues.add("name", "\u5c0f\u9ec4");\npbd.setBeanClass(Animal.class);\npbd.setPropertyValues(pValues);\nGenericBeanDefinition cbd = new GenericBeanDefinition();\ncbd.setBeanClass(Dog.class);\ncbd.setParentName("parent");\nMutablePropertyValues cValues = new MutablePropertyValues();\ncValues.add("name", "\u5c0f\u5f3a");\ncbd.setPropertyValues(cValues);\nctx.registerBeanDefinition("parent", pbd);\nctx.registerBeanDefinition("child", cbd);\nctx.refresh();\nDog child = (Dog) ctx.getBean("child");\nSystem.out.println("child = " + child);<\/code><\/pre>\n
\u8fd9\u91cc\u6211\u4f7f\u7528\u4e86 RootBeanDefinition \u6765\u505a parent\uff0c\u5176\u5b9e\u4ece\u540d\u5b57\u4e0a\u5c31\u80fd\u770b\u51fa\u6765 RootBeanDefinition \u9002\u5408\u505a parent\uff0c\u5e76\u4e14 RootBeanDefinition \u4e0d\u80fd\u4f5c\u4e3a child\u3002\u5f3a\u884c\u8bbe\u7f6e\u8fd0\u884c\u65f6\u4f1a\u629b\u51fa\u5f02\u5e38\uff0cRootBeanDefinition#setParentName \u65b9\u6cd5\u5982\u4e0b\uff1a<\/p>\n
@Override\npublic void setParentName(@Nullable String parentName) {\n    if (parentName != null) {\n        throw new IllegalArgumentException("Root bean cannot be changed into a child bean with parent reference");\n    }\n}<\/code><\/pre>\n
MutablePropertyValues \u662f\u4e3a\u76f8\u5e94\u7684\u5bf9\u8c61\u8bbe\u7f6e\u5c5e\u6027\u503c\u3002<\/p>\n
child \u6211\u8fd9\u91cc\u4f7f\u7528\u4e86 GenericBeanDefinition\uff0c\u8fd9\u4e2a\u4e3b\u8981\u662f\u505a child \u7684\u5904\u7406\uff0c\u6700\u65e9\u6709\u4e00\u4e2a\u4e13\u95e8\u505a child \u7684 ChildBeanDefinition\uff0c\u4e0d\u8fc7\u81ea\u4ece Spring2.5 \u5f00\u59cb\u63d0\u4f9b\u4e86 GenericBeanDefinition \u4e4b\u540e\uff0c\u73b0\u5728\u7528\u6765\u505a child \u9996\u9009 GenericBeanDefinition\u3002<\/p>\n
\u5728\u4e0a\u8ff0\u6848\u4f8b\u4e2d\uff0cparent \u548c child \u90fd\u8bbe\u7f6e\u4e86 name \u5c5e\u6027\uff0c\u90a3\u4e48 child \u4f1a\u8986\u76d6\u6389 parent\uff0c\u8fd9\u4e00\u70b9\u548c Java \u4e2d\u7684\u7ee7\u627f\u4e00\u81f4\u3002<\/p>\n
\u7528\u6cd5\u5c31\u662f\u8fd9\u6837\uff0c\u5e76\u4e0d\u96be\u3002<\/p>\n
\u8fd9\u5c31\u662f Spring BeanDefinition \u4e2d\u7684\u7236\u5b50\u5173\u7cfb\u95ee\u9898\u3002<\/p>\n
2. \u6e90\u7801\u5206\u6790<\/h2>\n
\u90a3\u4e48\u63a5\u4e0b\u6765\u6211\u4eec\u4e5f\u628a\u8fd9\u5757\u7684\u6e90\u7801\u7a0d\u5fae\u6765\u5206\u6790\u4e00\u4e0b\u3002<\/p>\n
\u7b80\u4fbf\u8d77\u89c1\uff0c\u6211\u4eec\u5c31\u4e0d\u4ece Bean \u7684\u521b\u5efa\u5f00\u59cb\u5206\u6790\u4e86\uff0c\u76f4\u63a5\u6765\u770b\u548c BeanDefinition \u4e2d parentName \u5c5e\u6027\u76f8\u5173\u7684\u5730\u65b9\uff0c\u4f46\u662f\u524d\u9762\u6d89\u53ca\u5230\u7684\u65b9\u6cd5\u8fd8\u662f\u7ed9\u5c0f\u4f19\u4f34\u4eec\u68b3\u7406\u4e00\u4e0b\uff0c\u5c31\u662f\u4e0b\u56fe\uff1a<\/p>\n
\"\"<\/p>\n
\u90a3\u4e48\u8fd9\u91cc\u6d89\u53ca\u5230\u7684\u5173\u952e\u65b9\u6cd5\u5176\u5b9e\u5c31\u662f AbstractBeanFactory#getMergedBeanDefinition\uff1a<\/p>\n
protected RootBeanDefinition getMergedBeanDefinition(\n        String beanName, BeanDefinition bd, @Nullable BeanDefinition containingBd)\n        throws BeanDefinitionStoreException {\n\n    synchronized (this.mergedBeanDefinitions) {\n        RootBeanDefinition mbd = null;\n        RootBeanDefinition previous = null;\n\n        \/\/ Check with full lock now in order to enforce the same merged instance.\n        if (containingBd == null) {\n            mbd = this.mergedBeanDefinitions.get(beanName);\n        }\n\n        if (mbd == null || mbd.stale) {\n            previous = mbd;\n            if (bd.getParentName() == null) {\n                \/\/ Use copy of given root bean definition.\n                if (bd instanceof RootBeanDefinition rootBeanDef) {\n                    mbd = rootBeanDef.cloneBeanDefinition();\n                }\n                else {\n                    mbd = new RootBeanDefinition(bd);\n                }\n            }\n            else {\n                \/\/ Child bean definition: needs to be merged with parent.\n                BeanDefinition pbd;\n                try {\n                    String parentBeanName = transformedBeanName(bd.getParentName());\n                    if (!beanName.equals(parentBeanName)) {\n                        pbd = getMergedBeanDefinition(parentBeanName);\n                    }\n                    else {\n                        if (getParentBeanFactory() instanceof ConfigurableBeanFactory parent) {\n                            pbd = parent.getMergedBeanDefinition(parentBeanName);\n                        }\n                        else {\n                            throw new NoSuchBeanDefinitionException(parentBeanName,\n                                    "Parent name '" + parentBeanName + "' is equal to bean name '" + beanName +\n                                            "': cannot be resolved without a ConfigurableBeanFactory parent");\n                        }\n                    }\n                }\n                \/\/ Deep copy with overridden values.\n                mbd = new RootBeanDefinition(pbd);\n                mbd.overrideFrom(bd);\n            }\n\n            \/\/ Set default singleton scope, if not configured before.\n            if (!StringUtils.hasLength(mbd.getScope())) {\n                mbd.setScope(SCOPE_SINGLETON);\n            }\n\n            \/\/ A bean contained in a non-singleton bean cannot be a singleton itself.\n            \/\/ Let's correct this on the fly here, since this might be the result of\n            \/\/ parent-child merging for the outer bean, in which case the original inner bean\n            \/\/ definition will not have inherited the merged outer bean's singleton status.\n            if (containingBd != null && !containingBd.isSingleton() && mbd.isSingleton()) {\n                mbd.setScope(containingBd.getScope());\n            }\n\n            \/\/ Cache the merged bean definition for the time being\n            \/\/ (it might still get re-merged later on in order to pick up metadata changes)\n            if (containingBd == null && isCacheBeanMetadata()) {\n                this.mergedBeanDefinitions.put(beanName, mbd);\n            }\n        }\n        if (previous != null) {\n            copyRelevantMergedBeanDefinitionCaches(previous, mbd);\n        }\n        return mbd;\n    }\n}<\/code><\/pre>\n
\u8fd9\u4e2a\u65b9\u6cd5\u770b\u540d\u5b57\u5c31\u662f\u8981\u83b7\u53d6\u4e00\u4e2a\u5408\u5e76\u4e4b\u540e\u7684 BeanDefinition\uff0c\u5c31\u662f\u5c06 child \u4e2d\u7684\u5c5e\u6027\u548c parent \u4e2d\u7684\u5c5e\u6027\u8fdb\u884c\u5408\u5e76\uff0c\u7136\u540e\u8fd4\u56de\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u4e2d\u6709\u4e00\u4e2a\u540d\u4e3a mbd \u7684\u53d8\u91cf\uff0c\u8fd9\u5c31\u662f\u5408\u5e76\u4e4b\u540e\u7684\u7ed3\u679c\u3002<\/p>\n
    \n
  1. \u9996\u5148\u4f1a\u5c1d\u8bd5\u4ece mergedBeanDefinitions \u53d8\u91cf\u4e2d\u83b7\u53d6\u5230\u5408\u5e76\u4e4b\u540e\u7684 BeanDefinition\uff0cmergedBeanDefinitions \u76f8\u5f53\u4e8e\u5c31\u662f\u4e00\u4e2a\u4e34\u65f6\u7f13\u5b58\uff0c\u5982\u679c\u4e4b\u524d\u5df2\u7ecf\u83b7\u53d6\u8fc7\u4e86\uff0c\u90a3\u4e48\u83b7\u53d6\u6210\u529f\u4e4b\u540e\u5c31\u5c06\u4e4b\u4fdd\u5b58\u5230 mergedBeanDefinitions \u4e2d\uff0c\u5982\u679c\u662f\u7b2c\u4e00\u6b21\u8fdb\u5165\u5230\u8be5\u65b9\u6cd5\u4e2d\uff0c\u90a3\u4e48\u8be5\u53d8\u91cf\u4e2d\u5c31\u6ca1\u6709\u6211\u4eec\u9700\u8981\u7684\u6570\u636e\uff0c\u6240\u4ee5\u4f1a\u7ee7\u7eed\u6267\u884c\u540e\u9762\u7684\u6b65\u9aa4\u3002<\/li>\n
  2. \u5f53\u7b2c 1 \u6b65\u5e76\u672a\u62ff\u5230 mbd \u7684\u65f6\u5019\uff0c\u63a5\u4e0b\u6765\u7ee7\u7eed\u5224\u65ad bd.getParentName()<\/code> \u662f\u5426\u4e3a\u7a7a\uff0c\u8fd9\u4e2a\u5176\u5b9e\u5c31\u662f\u67e5\u770b\u5f53\u524d\u7684 BeanDefinition \u662f\u5426\u6709\u8bbe\u7f6e parentName\uff0c\u5982\u679c\u6709\u8bbe\u7f6e\uff0c\u8fd9\u91cc\u83b7\u53d6\u5230\u7684\u5c31\u4e0d\u4e3a null\uff0c\u5426\u5219\u4e3a null\u3002\u5982\u679c\u8fd9\u91cc\u83b7\u53d6\u5230\u7684\u503c\u4e3a null\uff0c\u90a3\u4e48\u5c31\u4f1a\u6839\u636e\u5f53\u524d\u4f20\u5165\u7684 BeanDefinition \u751f\u6210\u4e00\u4e2a mbd\uff0c\u81f3\u4e8e\u5177\u4f53\u7684\u751f\u6210\u65b9\u5f0f\uff1a\u5982\u679c\u4f20\u5165\u7684 BeanDefinition \u662f RootBeanDefinition \u7c7b\u578b\u7684\uff0c\u5219\u8c03\u7528 clone \u65b9\u6cd5\u53bb\u751f\u6210 mbd\uff08\u672c\u8d28\u4e0a\u4e5f\u662f new \u4e00\u4e2a\u65b0\u7684 RootBeanDefinition\uff09\uff0c\u5982\u679c\u4f20\u5165\u7684 BeanDefinition \u4e0d\u662f RootBeanDefinition \u7c7b\u578b\u7684\uff0c\u5219\u76f4\u63a5 new \u4e00\u4e2a\u65b0\u7684 RootBeanDefinition\uff0c\u5728 new \u7684\u8fc7\u7a0b\u4e2d\uff0c\u4f1a\u628a\u4f20\u5165\u7684 BeanDefinition \u4e0a\u7684\u5c5e\u6027\u90fd\u590d\u5236\u5230\u65b0\u7684 RootBeanDefinition \u4e2d\u3002<\/li>\n
  3. \u5982\u679c bd.getParentName()<\/code> \u4e0d\u4e3a\u7a7a\uff0c\u5219\u610f\u5473\u7740\u5b58\u5728 parent BeanDefinition\uff0c\u6240\u4ee5\u5c31\u8981\u8fdb\u884c\u5408\u5e76\u5904\u7406\u4e86\uff0c\u5408\u5e76\u65f6\u5019\u53c8\u6709\u4e00\u4e2a\u5c0f\u7ec6\u8282\uff0c\u5982\u679c parentBeanName \u7b49\u4e8e\u5f53\u524d\u7684 beanName\uff0c\u7531\u4e8e Spring \u5728\u540c\u4e00\u4e2a\u5bb9\u5668\u4e2d\u4e0d\u5141\u8bb8\u5b58\u5728\u540c\u540d\u7684 bean\uff0c\u6240\u4ee5\u8fd9\u5c31\u8bf4\u660e parentBeanName \u53ef\u80fd\u662f\u7236\u5bb9\u5668\u7684 Bean\uff0c\u6b64\u65f6\u5c31\u8981\u53bb\u7236\u5bb9\u5668\u4e2d\u53bb\u5904\u7406\uff0c\u5f53\u7136\u6700\u7ec8\u8c03\u7528\u5230\u7684\u8fd8\u662f\u5f53\u524d\u65b9\u6cd5\uff0c\u5173\u4e8e\u7236\u5b50\u5bb9\u5668\u8fd9\u4e00\u5757\uff0c\u5c0f\u4f19\u4f34\u4eec\u53ef\u4ee5\u53c2\u8003\u677e\u54e5\u4e4b\u524d\u7684 Spring \u4e2d\u7684\u7236\u5b50\u5bb9\u5668\u662f\u548b\u56de\u4e8b\uff1f<\/a> \u4e00\u6587\u3002\u5982\u679c parentBeanName \u4e0d\u7b49\u4e8e\u5f53\u524d beanName\uff0c\u90a3\u4e48\u73b0\u5728\u5c31\u53ef\u4ee5\u8c03\u7528 getMergedBeanDefinition \u65b9\u6cd5\u53bb\u83b7\u53d6\u5230 parentBeanDefinition \u4e86\uff0cgetMergedBeanDefinition \u662f\u5f53\u524d\u65b9\u6cd5\u7684\u91cd\u8f7d\u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u6700\u7ec8\u4e5f\u4f1a\u8c03\u7528\u5230\u5f53\u524d\u65b9\u6cd5\uff0c\u539f\u56e0\u5c31\u5728\u4e8e parentBeanDefinition \u672c\u8eab\u4e5f\u53ef\u80fd\u5b58\u5728 parentBeanDefinition\u3002<\/li>\n
  4. \u6709\u4e86 pbd \u4e4b\u540e\uff0c\u63a5\u4e0b\u6765 new \u4e00\u4e2a RootBeanDefinition\uff0c\u7136\u540e\u8c03\u7528 overrideFrom \u65b9\u6cd5\u8fdb\u884c\u5c5e\u6027\u5408\u5e76\uff0c\u5408\u5e76\u7684\u65b9\u5f0f\u5c31\u662f\u7528\u4f20\u5165\u7684 BeanDefinition \u4e2d\u7684\u5c5e\u6027\u53bb\u8986\u76d6 pbd \u4e2d\u540c\u540d\u7684\u5c5e\u6027\u3002<\/li>\n
  5. \u6700\u540e\u5c31\u662f\u518d\u8bbe\u7f6e scope \u5c5e\u6027\u7b49\uff0c\u7136\u540e\u628a mbd \u8fd4\u56de\u5373\u53ef\u3002<\/li>\n<\/ol>\n
    \u6838\u5fc3\u6d41\u7a0b\u5c31\u662f\u4e0a\u9762\u8fd9\u4e2a\u6b65\u9aa4\uff0c\u5982\u6b64\u4e4b\u540e\uff0c\u62ff\u5230\u624b\u7684\u5c31\u662f\u548c parent \u5408\u5e76\u4e4b\u540e\u7684 BeanDefinition \u4e86\u3002<\/p>\n
    3. \u5c0f\u7ed3<\/h2>\n
    \u6700\u540e\u6211\u4eec\u518d\u6765\u7a0d\u5fae\u603b\u7ed3\u4e0b\uff1a<\/p>\n
    \u4f7f\u7528 parentName \u5c5e\u6027\u7684\u4e00\u4e2a\u4e3b\u8981\u4f18\u52bf\u662f\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u7ef4\u62a4\u6027\u548c\u91cd\u7528\u6027\u3002\u5f53\u6211\u4eec\u9700\u8981\u521b\u5efa\u591a\u4e2a\u76f8\u4f3c\u7684 bean \u65f6\uff0c\u53ef\u4ee5\u901a\u8fc7\u5b9a\u4e49\u4e00\u4e2a\u57fa\u7840 bean\uff0c\u5e76\u5728\u5176\u4ed6 bean \u4e2d\u4f7f\u7528 parentName \u5c5e\u6027\u6765\u7ee7\u627f\u5176\u914d\u7f6e\u3002\u8fd9\u6837\uff0c\u6211\u4eec\u53ea\u9700\u5728\u57fa\u7840 bean \u4e2d\u5b9a\u4e49\u4e00\u6b21\u914d\u7f6e\uff0c\u800c\u4e0d\u5fc5\u4e3a\u6bcf\u4e2a\u6d3e\u751f bean \u91cd\u590d\u76f8\u540c\u7684\u914d\u7f6e\u3002<\/p>\n
    \u53e6\u4e00\u4e2a\u4f7f\u7528 parentName \u5c5e\u6027\u7684\u573a\u666f\u662f\u5728\u591a\u4e2a\u5c42\u6b21\u7ed3\u6784\u4e2d\u5b9a\u4e49 bean\u3002\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u901a\u7528\u7684\u57fa\u7840\u670d\u52a1\u5c42 bean\uff0c\u800c\u4e0d\u540c\u7684\u4e1a\u52a1\u6a21\u5757\u9700\u8981\u5728\u6b64\u57fa\u7840\u4e0a\u8fdb\u884c\u6269\u5c55\u3002\u901a\u8fc7\u4f7f\u7528 parentName \u5c5e\u6027\uff0c\u6211\u4eec\u53ef\u4ee5\u4e3a\u6bcf\u4e2a\u4e1a\u52a1\u6a21\u5757\u5b9a\u4e49\u4e00\u4e2a\u6d3e\u751f bean\uff0c\u5e76\u5728\u5176\u4e2d\u6dfb\u52a0\u7279\u5b9a\u4e8e\u6a21\u5757\u7684\u914d\u7f6e\u3002\u8fd9\u79cd\u5c42\u6b21\u7ed3\u6784\u7684\u5b9a\u4e49\u4f7f\u5f97\u6211\u4eec\u53ef\u4ee5\u66f4\u597d\u5730\u7ec4\u7ec7\u548c\u7ba1\u7406\u4e0d\u540c\u6a21\u5757\u4e4b\u95f4\u7684 bean\u3002<\/p>\n
    \u901a\u8fc7\u4f7f\u7528 parentName \u5c5e\u6027\uff0c\u6211\u4eec\u53ef\u4ee5\u8f7b\u677e\u5730\u521b\u5efa\u548c\u7ba1\u7406 bean \u7684\u5c42\u6b21\u7ed3\u6784\u3002\u8fd9\u79cd\u7ee7\u627f\u5173\u7cfb\u4f7f\u5f97\u6211\u4eec\u53ef\u4ee5\u66f4\u597d\u5730\u7ec4\u7ec7\u548c\u91cd\u7528 bean \u7684\u914d\u7f6e\uff0c\u51cf\u5c11\u4e86\u4ee3\u7801\u7684\u5197\u4f59\u6027\u3002\u540c\u65f6\uff0c\u5b83\u8fd8\u63d0\u4f9b\u4e86\u4e00\u79cd\u7075\u6d3b\u7684\u65b9\u5f0f\u6765\u5b9a\u4e49\u4e0d\u540c\u6a21\u5757\u4e4b\u95f4\u7684 bean\uff0c\u4f7f\u5f97\u5e94\u7528\u7a0b\u5e8f\u66f4\u6613\u4e8e\u6269\u5c55\u548c\u7ef4\u62a4\u3002<\/p>\n
    \u7efc\u4e0a\u6240\u8ff0\uff0cSpring \u6846\u67b6\u4e2d\u7684 BeanDefinition \u7684 parentName \u5c5e\u6027\u5141\u8bb8\u6211\u4eec\u5728\u5b9a\u4e49 bean \u65f6\u5efa\u7acb\u7236\u5b50\u5173\u7cfb\uff0c\u4ece\u800c\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u7ef4\u62a4\u6027\u548c\u91cd\u7528\u6027\u3002\u901a\u8fc7\u7ee7\u627f\u5df2\u6709 bean \u7684\u914d\u7f6e\uff0c\u6211\u4eec\u53ef\u4ee5\u907f\u514d\u91cd\u590d\u7f16\u5199\u76f8\u4f3c\u7684\u914d\u7f6e\uff0c\u5e76\u66f4\u597d\u5730\u7ec4\u7ec7\u548c\u7ba1\u7406\u4e0d\u540c\u5c42\u6b21\u7ed3\u6784\u7684 bean\u3002<\/p>\n
    \u6709\u7684\u5c0f\u4f19\u4f34\u4eec\u53ef\u80fd\u4f1a\u641e\u6df7\u4eca\u5929\u5185\u5bb9\u548c\u4e4b\u524d\u677e\u54e5\u6240\u5199\u7684 Spring \u7236\u5b50\u5bb9\u5668\u4e4b\u95f4\u7684\u5173\u7cfb\uff0c\u5c0f\u4f19\u4f34\u4eec\u53c2\u8003\u8fd9\u7bc7\u6587\u7ae0\u5c31\u6e05\u695a\u5566\uff1aSpring \u4e2d\u7684\u7236\u5b50\u5bb9\u5668\u662f\u548b\u56de\u4e8b\uff1f<\/a>\u3002<\/p>\n
    \u53e6\u5916\uff0cSpring BeanDefinition \u4e2d\u7684 parentName \u548c Java \u4e2d\u7684\u7ee7\u627f\u867d\u7136\u6709\u70b9\u50cf\uff0c\u4f46\u662f\u5e76\u4e0d\u80fd\u540c\u7b49\u770b\u5f85\uff0c\u5b83\u4eec\u4e4b\u95f4\u4e5f\u8fd8\u662f\u6709\u4e00\u4e9b\u533a\u522b\u7684\uff1a<\/p>\n
      \n
    1. \u6982\u5ff5\u548c\u4f5c\u7528\uff1aJava \u4e2d\u7684\u7ee7\u627f\u662f\u4e00\u79cd\u9762\u5411\u5bf9\u8c61\u7684\u7f16\u7a0b\u6982\u5ff5\uff0c\u7528\u4e8e\u5b9a\u4e49\u7c7b\u4e4b\u95f4\u7684\u7236\u5b50\u5173\u7cfb\uff0c\u5b50\u7c7b\u7ee7\u627f\u7236\u7c7b\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u3002\u800c\u5728 Spring \u4e2d\uff0cBeanDefinition \u7684 parentName \u5c5e\u6027\u662f\u7528\u4e8e\u5b9a\u4e49 bean \u4e4b\u95f4\u7684\u7236\u5b50\u5173\u7cfb\uff0c\u4e00\u4e2a\u6d3e\u751f bean \u53ef\u4ee5\u7ee7\u627f\u53e6\u4e00\u4e2a\u5df2\u5b9a\u4e49\u7684 bean \u7684\u914d\u7f6e\u3002<\/li>\n
    2. \u8bed\u6cd5\u548c\u7528\u6cd5\uff1a\u5728 Java \u4e2d\uff0c\u7ee7\u627f\u662f\u901a\u8fc7\u4f7f\u7528\u5173\u952e\u5b57 extends<\/code> \u6765\u5b9e\u73b0\u7684\uff0c\u5b50\u7c7b\u901a\u8fc7\u7ee7\u627f\u7236\u7c7b\u6765\u83b7\u5f97\u7236\u7c7b\u7684\u5c5e\u6027\u548c\u65b9\u6cd5\u3002\u800c\u5728 Spring \u4e2d\uff0c\u901a\u8fc7\u5728 BeanDefinition \u4e2d\u914d\u7f6e parentName \u5c5e\u6027\u6765\u6307\u5b9a\u4e00\u4e2a bean \u7684\u7236 bean\uff0c\u4ece\u800c\u7ee7\u627f\u7236 bean \u7684\u914d\u7f6e\u3002<\/li>\n
    3. \u8303\u56f4\u548c\u5e94\u7528\uff1aJava \u4e2d\u7684\u7ee7\u627f\u4e3b\u8981\u7528\u4e8e\u7c7b\u7684\u7ee7\u627f\u5173\u7cfb\uff0c\u7528\u4e8e\u5b9a\u4e49\u7c7b\u4e4b\u95f4\u7684\u5c42\u6b21\u7ed3\u6784\u548c\u4ee3\u7801\u7684\u91cd\u7528\u3002\u800c\u5728 Spring \u4e2d\uff0cBeanDefinition \u7684\u7ee7\u627f\u4e3b\u8981\u7528\u4e8e\u5b9a\u4e49 bean \u4e4b\u95f4\u7684\u914d\u7f6e\u7ee7\u627f\u5173\u7cfb\uff0c\u7528\u4e8e\u7ec4\u7ec7\u548c\u7ba1\u7406 bean \u7684\u914d\u7f6e\uff0c\u63d0\u9ad8\u4ee3\u7801\u7684\u53ef\u7ef4\u62a4\u6027\u548c\u91cd\u7528\u6027\u3002<\/li>\n<\/ol>\n
      \u597d\u5566\uff0cSpring BeanDefinition \u4e2d\u7684 parentName \u5c5e\u6027\u73b0\u5728\u5927\u5bb6\u660e\u767d\u4e86\u5427~<\/p>\n
      https:\/\/segmentfault.com\/a\/1190000044119391<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
      \u5728 Spring \u6846\u67b6\u4e2d\uff0cBeanDefinition \u662f\u4e00\u4e2a\u6838\u5fc3\u6982\u5ff5\uff0c\u7528\u4e8e\u5b9a\u4e49\u548c\u914d\u7f6e bean \u7684\u5143\u6570\u636e\uff0c\u867d […]<\/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-10008102","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\/10008102","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=10008102"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10008102\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10008102"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10008102"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10008102"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}