{"id":10006862,"date":"2022-11-17T02:55:55","date_gmt":"2022-11-16T18:55:55","guid":{"rendered":"https:\/\/ityet.com\/?p=10006862"},"modified":"2022-11-17T02:55:55","modified_gmt":"2022-11-16T18:55:55","slug":"%e6%ba%90%e7%a0%81%e5%ad%a6%e4%b9%a0%e4%b9%8b-spring-%e5%ae%b9%e5%99%a8%e5%88%9b%e5%bb%ba%e5%8e%9f%e7%90%86","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10006862","title":{"rendered":"\u6e90\u7801\u5b66\u4e60\u4e4b Spring \u5bb9\u5668\u521b\u5efa\u539f\u7406"},"content":{"rendered":"

1 \u524d\u8a00<\/h3>\n

\u4f17\u6240\u5468\u77e5\uff0cSpring\u53ef\u4ee5\u5e2e\u6211\u4eec\u7ba1\u7406\u6211\u4eec\u9700\u8981\u7684bean\u3002\u5728\u6211\u4eec\u9700\u8981\u7528\u5230\u8fd9\u4e9bbean\u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u5f88\u65b9\u4fbf\u7684\u83b7\u53d6\u5230\u5b83\uff0c\u7136\u540e\u8fdb\u884c\u4e00\u7cfb\u5217\u7684\u64cd\u4f5c\u3002\u6bd4\u5982\uff0c\u6211\u4eec\u5b9a\u4e49\u4e00\u4e2abean MyTestBean\u3002<\/p>\n

public class MyTestBean {\nprivate String testStr = "testStr";\n\npublic String getTestStr() {\nreturn testStr;\n}\n\npublic void setTestStr(String testStr) {\nthis.testStr = testStr;\n}<\/code><\/pre>\n
\u7136\u540exml\u914d\u7f6e\u4e00\u4e0b<\/p>\n
<?xml version="1.0" encoding="UTF-8"?>\n<beans xmlns="http:\/\/www.springframework.org\/schema\/beans"\nxmlns:xsi="http:\/\/www.w3.org\/2001\/XMLSchema-instance"\nxsi:schemaLocation="http:\/\/www.springframework.org\/schema\/beans http:\/\/www.springframework.org\/schema\/beans\/spring-beans-3.1.xsd">\n<bean id = "myTestBean" class="bean.MyTestBean"\/>\n<\/beans><\/code><\/pre>\n
\u7f16\u5199\u4e00\u4e0b\u6d4b\u8bd5\u4ee3\u7801\uff0c\u6d4b\u8bd5\u4e00\u4e0b\uff0c\u5c31\u4f1a\u770b\u5230\u6d4b\u8bd5\u901a\u8fc7\u7684\u7ed3\u679c\u3002<\/p>\n
public class BeanFactoryTest {\n\n@Test\npublic void testSimpleLoad() {\nBeanFactory bf = new XmlBeanFactory(new ClassPathResource("beanFactoryTest.xml"));\nMyTestBean bean = (MyTestBean)bf.getBean("myTestBean");\nassert "testStr".equals(bean.getTestStr());\n}\n}<\/code><\/pre>\n
\u76f4\u63a5\u4f7f\u7528BeanFactory\u4f5c\u4e3a\u5bb9\u5668\u5bf9\u4e8eSpring\u6765\u8bf4\u4e0d\u5e38\u89c1\uff0c\u8fd9\u91cc\u53ea\u662f\u7528\u6765\u6d4b\u8bd5\uff0c\u4ee5\u4fbf\u53ef\u4ee5\u66f4\u5feb\u66f4\u597d\u5730\u5206\u6790Spring\u5185\u90e8\u539f\u7406\u3002\u5176\u6d89\u53ca\u5230\u7684\u4e00\u4e9b\u7ec4\u4ef6\uff0c\u8d2f\u7a7f\u6574\u4e2aSpring\u5bb9\u5668\u5f53\u4e2d\uff0c\u5bf9\u4e8e\u6211\u4eec\u4e86\u89e3\u5176\u4ed6Spring\u5bb9\u5668\u4e5f\u6709\u5f88\u5927\u7684\u5e2e\u52a9\u3002\u9650\u4e8e\u7bc7\u5e45\uff0c\u8fd9\u91cc\u53ea\u4ecb\u7ecd\u8be5\u5bb9\u5668\u521b\u5efa\u7684\u90e8\u5206\uff0c\u5373\u5bf9\u4e8enew XmlBeanFactory(new ClassPathResource(\u201cbeanFactoryTest.xml\u201d))\uff0cSpring\u90fd\u5e72\u4e86\u4e9b\u4ec0\u4e48\u3002<\/p>\n
2 Spring\u5bb9\u5668\u521b\u5efa\u539f\u7406<\/h3>\n
2.1 \u6574\u4f53\u5b9e\u73b0\u6d41\u7a0b<\/h4>\n
\u9996\u5148\u6211\u4eec\u5927\u81f4\u4e86\u89e3\u4e00\u4e0bSpring\u5bb9\u5668\u521b\u5efa\u7684\u6574\u4f53\u8fc7\u7a0b\u3002<\/p>\n
\"\"<\/p>\n
\u6574\u4f53\u65f6\u5e8f\u56fe<\/p>\n
\u53ef\u4ee5\u770b\u5230\uff0c\u8be5Spring\u5bb9\u5668\u521b\u5efa\u5927\u81f4\u5206\u4e3a\u4ee5\u4e0b\u51e0\u90e8\u5206\uff1a<\/p>\n
    \n
  1. \u8d44\u6e90\u7684\u5c01\u88c5\uff0c\u4ee5Resource\u5c01\u88c5\u914d\u7f6e\u6587\u4ef6<\/li>\n
  2. \u52a0\u8f7dBeanDefinition<\/li>\n
  3. \u89e3\u6790\u914d\u7f6e\u6587\u4ef6\uff0c\u83b7\u53d6Document<\/li>\n
  4. \u89e3\u6790\u53ca\u6ce8\u518cBeanDefinition<\/li>\n
  5. \u6807\u7b7e\u7684\u89e3\u6790\uff0c\u5206\u4e3a\u9ed8\u8ba4\u6807\u7b7e\u548c\u81ea\u5b9a\u4e49\u6807\u7b7e\u7684\u89e3\u6790<\/li>\n<\/ol>\n
    \u4e0b\u9762\u6211\u4eec\u5c31\u4ee5\u8fd9\u6837\u7684\u987a\u5e8f\u5bf9\u5404\u4e2a\u90e8\u5206\u4ece\u4ee3\u7801\u5b9e\u73b0\u4e0a\u8fdb\u884c\u5177\u4f53\u5206\u6790\u3002<\/p>\n
    2.2 \u6838\u5fc3\u7c7b\u4ecb\u7ecd<\/h4>\n
    \u5728\u8fdb\u884c\u5177\u4f53\u521b\u5efa\u903b\u8f91\u4e4b\u524d\uff0c\u6211\u4eec\u5148\u5bf9Spring\u5bb9\u5668\u521b\u5efa\u7684\u6838\u5fc3\u7c7b\u8fdb\u884c\u4ecb\u7ecd\uff0c\u4ee5\u4fbf\u6211\u4eec\u66f4\u597d\u5730\u638c\u63e1\u5b83\u7684\u5b9e\u73b0\u8fc7\u7a0b\u3002<\/p>\n
    2.2.1 DefaultListableBeanFactory<\/strong><\/p>\n
    XmlBeanFactory\u7ee7\u627f\u81eaDefaultListableBeanFactory\uff0c\u800cDefaultListableBeanFactory\u662f\u6574\u4e2abean\u52a0\u8f7d\u7684\u6838\u5fc3\u90e8\u5206\uff0c\u662fSpring\u6ce8\u518c\u53ca\u52a0\u8f7dbean\u7684\u9ed8\u8ba4\u5b9e\u73b0\u3002XmlBeanFactory\u4e0eDefaultListableBeanFactory\u7684\u4e0d\u540c\u4e4b\u5904\u5728\u4e8e\uff0cXmlBeanFactory\u4f7f\u7528\u4e86\u81ea\u5b9a\u4e49\u7684XML\u8bfb\u53d6\u5668XmlBeanDefinitionReader\uff0c\u5b9e\u73b0\u4e86\u4e2a\u6027\u5316\u7684BeanDefinitionReader\u8bfb\u53d6\u3002<\/p>\n
    \"\"<\/p>\n
    \u5bb9\u5668\u52a0\u8f7d\u76f8\u5173\u7c7b\u56fe<\/p>\n
    2.2.2 XmlBeanDefinitionReader<\/strong><\/p>\n
    XmlBeanDefinitionReader\u7528\u4e8e\u8d44\u6e90\u6587\u4ef6\u8bfb\u53d6\u3001\u89e3\u6790\u53caBean\u6ce8\u518c\u3002\u8bfb\u53d6Xml\u914d\u7f6e\u6587\u4ef6\u7684\u6d41\u7a0b\u5927\u81f4\u4e3a\uff0c\u9996\u5148\u4f7f\u7528ResourceLoader\u5c06\u8d44\u6e90\u6587\u4ef6\u8def\u5f84\u8f6c\u6362\u4e3a\u5bf9\u5e94\u7684Resource\u6587\u4ef6\uff0c\u7136\u540e\u5c06Resource\u6587\u4ef6\u8f6c\u6362\u4e3aDocument\u6587\u4ef6\uff0c\u6700\u540e\u5bf9Document\u53caElement\u8fdb\u884c\u89e3\u6790\u3002<\/p>\n
    \"\"<\/p>\n
    \u914d\u7f6e\u6587\u4ef6\u8bfb\u53d6\u76f8\u5173\u7c7b\u56fe<\/p>\n
    2.2.3 BeanDefinition<\/strong><\/p>\n
    \u5728Spring\u4e2d\uff0cBeanDefinition\u662f\u914d\u7f6e\u6587\u4ef6\u5143\u7d20\u6807\u7b7e\u5728\u5bb9\u5668\u4e2d\u7684\u5185\u90e8\u8868\u793a\u5f62\u5f0f\uff0c\u5305\u542b\u4e86\u5143\u7d20\u7684\u6240\u6709\u4fe1\u606f\u3002Spring\u5c06\u914d\u7f6e\u6587\u4ef6\u4e2d\u7684\u8f6c\u6362\u4e3aBeanDefinition\uff0c\u5e76\u5c06\u8fd9\u4e9bBeanDefinition\u6ce8\u518c\u5230BeanDefinitionRegistry\u4e2d\u3002BeanDefinitionRegistry\u4ee5map\u5f62\u5f0f\u4fdd\u5b58\uff0c\u540e\u7eed\u64cd\u4f5c\u76f4\u63a5\u4eceBeanDefinitionRegistry\u4e2d\u8bfb\u53d6\u914d\u7f6e\u4fe1\u606f\u3002<\/p>\n
    \"\"<\/p>\n
    BeanDefinition\u53ca\u5176\u5b9e\u73b0\u7c7b<\/p>\n
    2.3 \u914d\u7f6e\u6587\u4ef6\u7684\u5c01\u88c5<\/h4>\n
    \u5728Java\u4e2d\u4e0d\u540c\u7684\u8d44\u6e90\u90fd\u8981\u62bd\u8c61\u6210URL\uff0c\u7136\u540e\u4f7f\u7528\u4e0d\u540c\u7c7b\u578b\u7684URLStreamHandler\u5904\u7406\u4e0d\u540c\u7684URL\u8868\u793a\u7684\u8d44\u6e90\u3002\u4f46\u662f\uff0cSpring\u5bf9\u5176\u5185\u90e8\u4f7f\u7528\u5230\u7684\u8d44\u6e90\u5b9e\u73b0\u4e86\u81ea\u5df1\u7684\u62bd\u8c61\u7ed3\u6784\uff1aResource\u63a5\u53e3\u5c01\u88c5\u5e95\u5c42\u8d44\u6e90\u3002\u4e3b\u8981\u539f\u56e0\u67093\u70b9\uff1a<\/p>\n
      \n
    1. URL\u6ca1\u6709\u9ed8\u8ba4\u5b9a\u4e49\u76f8\u5bf9Classpath\u6216ServletContext\u7b49\u8d44\u6e90\u7684handler<\/li>\n
    2. URL\u6ca1\u6709\u63d0\u4f9b\u57fa\u672c\u7684\u65b9\u6cd5\uff0c\u4f8b\u5982\u68c0\u67e5\u5f53\u524d\u8d44\u6e90\u662f\u5426\u5b58\u5728\u662f\u5426\u53ef\u8bfb\u7b49<\/li>\n
    3. \u81ea\u5b9a\u4e49URL handler\u9700\u8981\u4e86\u89e3URL\u5b9e\u73b0\u673a\u5236<\/li>\n<\/ol>\n
      \u5bf9\u4e0d\u540c\u6765\u6e90\u7684\u8d44\u6e90\u6587\u4ef6\u90fd\u6709\u76f8\u5e94\u7684Resource\u5b9e\u73b0\uff1a\u6587\u4ef6\uff08FileSystemResource\uff09\u3001Classpath\u8d44\u6e90\uff08ClassPathResource\uff09\u3001URL\u8d44\u6e90\uff08UrlResource\uff09\u3001InputStream\u8d44\u6e90\uff08InputStreamResource\uff09\u3001Byte\u6570\u7ec4\uff08ByteArrayResource\uff09\u7b49\u3002<\/p>\n
      \"\"<\/p>\n
      \u8d44\u6e90\u6587\u4ef6\u5904\u7406\u76f8\u5173\u7c7b\u56fe<\/p>\n
      2.4 \u52a0\u8f7dBeanDefinition<\/h4>\n
      \u4e0b\u9762\u6211\u4eec\u5c31\u4ece\u4ee3\u7801\u5c42\u6b21\u770b\u770b\u6574\u4e2a\u5bb9\u5668\u7a76\u7adf\u662f\u600e\u4e48\u5b9e\u73b0\u7684\u3002\u89c2\u5bdf\u6d4b\u8bd5\u4ee3\u7801\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06XmlBeanFactory\u7684\u6784\u9020\u65b9\u6cd5\u4f5c\u4e3a\u5207\u5165\u70b9\u8fdb\u884c\u5206\u6790\u3002<\/p>\n
      public XmlBeanFactory(Resource resource) throws BeansException {\nthis(resource, null);\n}\npublic XmlBeanFactory(Resource resource, BeanFactory parentBeanFactory) throws BeansException {\nsuper(parentBeanFactory);\n\/\/ \u52a0\u8f7dBeanDefinition\nthis.reader.loadBeanDefinitions(resource);\n}<\/code><\/pre>\n
      \u4e3b\u8981\u505a\u4e86\u4e24\u4ef6\u4e8b\uff0c\u4e00\u662f\u8c03\u7528\u7236\u7c7b\u7684\u6784\u9020\u65b9\u6cd5\uff0c\u4e8c\u662f\u52a0\u8f7dBeanDefinition\u3002  
      \u9996\u5148\u6211\u4eec\u5148\u8fdb\u5165\u7236\u7c7b\u6784\u9020\u65b9\u6cd5\uff0c\u6700\u7ec8\u8fdb\u5230AbstractAutowireCapableBeanFactory\u6784\u9020\u65b9\u6cd5\u4e2d\u3002<\/p>\n
      \npublic AbstractAutowireCapableBeanFactory() {\nsuper();\n\/\/ \u5ffd\u7565BeanNameAware\u3001BeanFactoryAware\u548cBeanClassLoaderAware\u63a5\u53e3\u7684\u81ea\u52a8\u88c5\u914d\u529f\u80fd\nignoreDependencyInterface(BeanNameAware.class);\nignoreDependencyInterface(BeanFactoryAware.class);\nignoreDependencyInterface(BeanClassLoaderAware.class);\n}<\/code><\/pre>\n
      \u4e3b\u8981\u662fignoreDependencyInterface\u65b9\u6cd5\uff0c\u5b83\u7684\u4e3b\u8981\u529f\u80fd\u662f\u5ffd\u7565\u7ed9\u5b9a\u63a5\u53e3\u7684\u81ea\u52a8\u88c5\u914d\u529f\u80fd\u3002\u5b9e\u73b0\u4e0a\u5f88\u7b80\u5355\uff0c\u5c31\u662f\u628a\u8fd9\u4e9bClass\u52a0\u5165\u5230ignoredDependencyInterfaces\u96c6\u5408\u4e2d\uff0cignoredDependencyInterfaces\u662fSet>\u7c7b\u578b\u3002<\/p>\n
      \u518d\u770b\u52a0\u8f7dBean\u7684\u65b9\u6cd5\uff0c\u6267\u884c\u7684\u662fXmlBeanDefinitionReader\u7c7b\u7684loadBeanDefinitions\u65b9\u6cd5\u3002\u8fdb\u5165\u65b9\u6cd5\uff0c\u53ef\u4ee5\u770b\u5230\u4e3b\u8981\u5c31\u662f\u505a\u4e86\u4e24\u4ef6\u4e8b\uff0c\u4e00\u662f\u6784\u9020InputSource\uff0c\u8fd9\u4e2a\u7c7b\u5168\u8def\u5f84\u540d\u662forg.xml.sax.InputSource\uff0c\u8fd9\u6b65\u7684\u76ee\u7684\u5c31\u662f\u901a\u8fc7SAX\u8bfb\u53d6XML\u6587\u4ef6\u4e8b\u5148\u51c6\u5907\u4e00\u4e0bInputSource\u5bf9\u8c61\u3002\u800c\u771f\u6b63\u7684\u52a0\u8f7dBean\u7684\u903b\u8f91\u5728doLoadBeanDefinitions\u65b9\u6cd5\u4e2d\u3002<\/p>\n
      public int loadBeanDefinitions(EncodedResource encodedResource) throws BeanDefinitionStoreException {\nInputStream inputStream = encodedResource.getResource().getInputStream();\n\/\/ \u6784\u5efaInputSource\uff0c\u7528\u4e8e\u89e3\u6790XML\nInputSource inputSource = new InputSource(inputStream);\nif (encodedResource.getEncoding() != null) {\ninputSource.setEncoding(encodedResource.getEncoding());\n}\n\/\/ \u5b9e\u9645\u52a0\u8f7dBeanDefinition\u7684\u6267\u884c\u903b\u8f91\nreturn doLoadBeanDefinitions(inputSource, encodedResource.getResource());\n}<\/code><\/pre>\n
      doLoadBeanDefinitions\u65b9\u6cd5\u9996\u5148\u52a0\u8f7dXML\u6587\u4ef6\uff0c\u5f97\u5230Document\u5bf9\u8c61\uff0c\u7136\u540e\u6839\u636eDocument\u5bf9\u8c61\u6ce8\u518cBean\u3002\u6211\u4eec\u9996\u5148\u770b\u4e0b\u5f97\u5230Document\u5bf9\u8c61\u7684\u8fc7\u7a0b\u3002<\/p>\n
      2.5 \u83b7\u53d6Document<\/h4>\n
      \u83b7\u53d6Document\uff0c\u9996\u5148\u901a\u8fc7getValidationModeForResource\u83b7\u53d6XML\u9a8c\u8bc1\u6a21\u5f0f\uff0c\u7136\u540e\u89e3\u6790\u5f97\u5230Document\u5bf9\u8c61\u3002<\/p>\n
      protected Document doLoadDocument(InputSource inputSource, Resource resource) throws Exception {\n\/\/ \u9996\u5148\u83b7\u53d6XML\u9a8c\u8bc1\u6a21\u5f0f\uff0c\u7136\u540eSAX\u65b9\u5f0f\u89e3\u6790\u5f97\u5230Document\nreturn this.documentLoader.loadDocument(inputSource, getEntityResolver(), this.errorHandler,\ngetValidationModeForResource(resource), isNamespaceAware());\n}<\/code><\/pre>\n
      \u5e38\u7528\u7684XML\u9a8c\u8bc1\u6a21\u5f0f\u6709\u4e24\u79cd\uff1aDTD\u548cXSD\uff0c\u5b9e\u9645\u4f7f\u7528\u54ea\u79cd\u9a8c\u8bc1\u6a21\u5f0f\u5728getValidationModeForResource\u4e2d\u8fdb\u884c\u4e86\u89e3\u6790\u3002\u8fd9\u4e2a\u65b9\u6cd5\u5224\u65ad\u662fDTD\u9a8c\u8bc1\u8fd8\u662fXSD\u9a8c\u8bc1\uff0c\u4ec5\u4ec5\u662f\u5224\u65ad\u4e00\u4e0bXML\u662f\u5426\u5305\u542bDOCTYPE\u5b57\u7b26\u4e32\u3002<\/p>\n
      \u800c\u89e3\u6790\u5f97\u5230Document\u7684\u65b9\u6cd5\u5f88\u7b80\u5355\uff0c\u5c31\u662f\u901a\u8fc7SAX\u89e3\u6790XML\u6587\u6863\u7684\u5957\u8def\u3002\u8fd9\u91cc\u4e0d\u518d\u8d58\u8ff0\u3002<\/p>\n
      2.6 \u89e3\u6790\u53ca\u6ce8\u518cBeanDefinition<\/h4>\n
      \u5f53\u628a\u6587\u4ef6\u8f6c\u6362\u4e3aDocument\u540e\uff0c\u63a5\u4e0b\u6765\u7684\u63d0\u53d6\u53ca\u6ce8\u518cbean\u5c31\u662f\u6211\u4eec\u7684\u91cd\u5934\u620f\u4e86\u3002\u8c03\u7528\u4e86\u4ee5\u4e0b\u65b9\u6cd5\u3002<\/p>\n
      \npublic int registerBeanDefinitions(Document doc, Resource resource) throws BeanDefinitionStoreException {\nBeanDefinitionDocumentReader documentReader = createBeanDefinitionDocumentReader();\nint countBefore = getRegistry().getBeanDefinitionCount();\n\/\/ \u6ce8\u518cBeanDefinition\ndocumentReader.registerBeanDefinitions(doc, createReaderContext(resource));\nreturn getRegistry().getBeanDefinitionCount() - countBefore;\n}<\/code><\/pre>\n
      \u5728\u8fd9\u4e2a\u65b9\u6cd5\u4e2d\u5f88\u597d\u5730\u5e94\u7528\u4e86\u5355\u4e00\u804c\u8d23\u539f\u5219\uff0c\u5c06\u903b\u8f91\u5904\u7406\u59d4\u6258\u7ed9\u5355\u4e00\u7684\u7c7b\u8fdb\u884c\u5904\u7406\uff0c\u800c\u8fd9\u4e2a\u903b\u8f91\u5904\u7406\u7c7b\u5c31\u662fBeanDefinitionDocumentReader\u3002BeanDefinitionDocumentReader\u662f\u4e00\u4e2a\u63a5\u53e3\uff0c\u5b9e\u4f8b\u5316\u7684\u5de5\u4f5c\u5728createBeanDefinitionDocumentReader()\u4e2d\u5b8c\u6210\uff0c\u771f\u6b63\u7684\u7c7b\u578b\u662fDefaultBeanDefinitionDocumentReader\u3002\u800c\u5b83\u7684registerBeanDefinitions\u65b9\u6cd5\u5f88\u7b80\u5355\uff0c\u4ec5\u4ec5\u662f\u5148\u6839\u636eDocument\u83b7\u53d6\u4e86root\uff0c\u5b9e\u9645\u6ce8\u518c\u5728doRegisterBeanDefinitions\u65b9\u6cd5\u4e2d\u3002<\/p>\n
      \nprotected void doRegisterBeanDefinitions(Element root) {\nif (this.delegate.isDefaultNamespace(root)) {\nString profileSpec = root.getAttribute(PROFILE_ATTRIBUTE);\nif (StringUtils.hasText(profileSpec)) {\nString[] specifiedProfiles = StringUtils.tokenizeToStringArray(\nprofileSpec, BeanDefinitionParserDelegate.MULTI_VALUE_ATTRIBUTE_DELIMITERS);\n\/\/ \u5982\u679c\u73af\u5883\u53d8\u91cf\u4e0d\u5305\u542b\u6307\u5b9aprofile\uff0c\u5219\u6d41\u7a0b\u7ed3\u675f\nif (!getReaderContext().getEnvironment().acceptsProfiles(specifiedProfiles)) {\nreturn;\n}\n}\n}\npreProcessXml(root);\n\/\/ \u89e3\u6790BeanDefinition\nparseBeanDefinitions(root, this.delegate);\npostProcessXml(root);\n}<\/code><\/pre>\n
      \u6ce8\u518c\u8fc7\u7a0b\u9996\u5148\u5bf9profile\u8fdb\u884c\u5904\u7406\uff0c\u5982\u679c\u662f\u73af\u5883\u53d8\u91cf\u5b9a\u4e49\u7684\u5219\u8fdb\u884c\u5904\u7406\uff0c\u5426\u5219\u4e0d\u8fdb\u884c\u5904\u7406\u3002\u7136\u540e\u5c31\u662f\u89e3\u6790bean\u3002\u8fd9\u91cc\u8c03\u7528\u4e86preProcessXml(root)\u548cpostProcessXml(root)\u4e24\u4e2a\u65b9\u6cd5\uff0c\u4f46\u662f\u53d1\u73b0\u8fd9\u4e24\u4e2a\u65b9\u6cd5\u662f\u7a7a\u65b9\u6cd5\u3002\u8fd9\u91cc\u5e94\u7528\u4e86\u6a21\u677f\u65b9\u6cd5\u6a21\u5f0f\u3002\u5982\u679c\u7ee7\u627f\u81eaDefaultBeanDefinitionDocumentReader\u7684\u5b50\u7c7b\u9700\u8981\u5728Bean\u89e3\u6790\u524d\u540e\u505a\u4e00\u4e9b\u5904\u7406\u7684\u8bdd\uff0c\u53ea\u9700\u8981\u91cd\u5199\u8fd9\u4e24\u4e2a\u65b9\u6cd5\u5373\u53ef\u3002<\/p>\n
      \nprotected void parseBeanDefinitions(Element root, BeanDefinitionParserDelegate delegate) {\nif (delegate.isDefaultNamespace(root)) {\n\/\/ \u6839\u5143\u7d20\u662f\u9ed8\u8ba4\u547d\u540d\u7a7a\u95f4\nNodeList nl = root.getChildNodes();\nfor (int i = 0; i < nl.getLength(); i++) {\nNode node = nl.item(i);\nif (node instanceof Element) {\nElement ele = (Element) node;\nif (delegate.isDefaultNamespace(ele)) {\n\/\/ \u5982\u679c\u5143\u7d20\u662f\u9ed8\u8ba4\u547d\u540d\u7a7a\u95f4\uff0c\u5219\u6309\u9ed8\u8ba4\u65b9\u5f0f\u89e3\u6790\u5143\u7d20\nparseDefaultElement(ele, delegate);\n}\nelse {\n\/\/ \u5982\u679c\u8fd9\u4e2a\u5143\u7d20\u662f\u81ea\u5b9a\u4e49\u547d\u540d\u7a7a\u95f4\uff0c\u5219\u6309\u81ea\u5b9a\u4e49\u65b9\u5f0f\u89e3\u6790\u5143\u7d20\ndelegate.parseCustomElement(ele);\n}\n}\n}\n}\nelse {\n\/\/ \u5982\u679c\u6839\u5143\u7d20\u662f\u81ea\u5b9a\u4e49\u547d\u540d\u7a7a\u95f4\uff0c\u5219\u6309\u81ea\u5b9a\u4e49\u65b9\u5f0f\u89e3\u6790\u5143\u7d20\ndelegate.parseCustomElement(root);\n}\n}<\/code><\/pre>\n
      \u800c\u89e3\u6790bean\u9700\u8981\u5224\u65ad\u5143\u7d20\u662f\u5426\u662f\u9ed8\u8ba4\u547d\u540d\u7a7a\u95f4\uff0c\u5982\u679c\u662f\u5219\u8c03\u7528parseDefaultElement(ele, delegate)\u65b9\u6cd5\uff0c\u4e0d\u662f\u5219\u8c03\u7528delegate.parseCustomElement(ele)\u65b9\u6cd5\u3002\u5224\u65ad\u662f\u5426\u662f\u9ed8\u8ba4\u547d\u540d\u7a7a\u95f4\uff0c\u8c03\u7528isDefaultNamespace\u65b9\u6cd5\uff0c\u5143\u7d20\u6216\u8005\u8282\u70b9\u7684\u547d\u540d\u7a7a\u95f4\u4e0eSpring\u4e2d\u56fa\u5b9a\u7684\u547d\u540d\u7a7a\u95f4http:\/\/www.springframework.org\/schema\/beans<\/a>\u8fdb\u884c\u5bf9\u6bd4\uff0c\u4e00\u81f4\u5219\u8ba4\u4e3a\u662f\u9ed8\u8ba4\u7684\uff0c\u5426\u5219\u5c31\u8ba4\u4e3a\u662f\u81ea\u5b9a\u4e49\u7684\u3002<\/p>\n
      2.7 \u9ed8\u8ba4\u6807\u7b7e\u7684\u89e3\u6790<\/h4>\n
      \u9ed8\u8ba4\u6807\u7b7e\u7684\u89e3\u6790\u903b\u8f91\u4e00\u76ee\u4e86\u7136\uff0c\u5206\u522b\u5bf94\u79cd\u4e0d\u540c\u6807\u7b7e\uff08import\u3001alias\u3001bean\u548cbeans\uff09\u505a\u4e86\u4e0d\u540c\u7684\u5904\u7406\u3002<\/p>\n
      2.7.1 bean\u6807\u7b7e\u7684\u89e3\u6790\u53ca\u6ce8\u518c<\/strong><\/p>\n
      \u5bf9bean\u6807\u7b7e\u7684\u89e3\u6790\u662f\u901a\u8fc7processBeanDefinition(ele, delegate)\u65b9\u6cd5\u8fdb\u884c\u7684\u3002\u5927\u81f4\u903b\u8f91\u603b\u7ed3\u5982\u4e0b\uff1a<\/p>\n
        \n
      1. \u9996\u5148\u59d4\u6258BeanDefinitionDelegate\u7c7b\u7684parseBeanDefinitionElement\u65b9\u6cd5\u8fdb\u884c\u5143\u7d20\u89e3\u6790\uff0c\u8fd4\u56deBeanDefinitionHolder\u7c7b\u578b\u7684\u5b9e\u4f8bbdHolder\uff0c\u7ecf\u8fc7\u8fd9\u4e2a\u65b9\u6cd5\u540e\uff0cbdHolder\u5b9e\u4f8b\u5df2\u7ecf\u5305\u542b\u6211\u4eec\u914d\u7f6e\u6587\u4ef6\u4e2d\u914d\u7f6e\u7684\u5404\u79cd\u5c5e\u6027\u4e86\uff0c\u4f8b\u5982class\u3001name\u3001id\u3001alias\u7b49\u5c5e\u6027\u3002<\/li>\n
      2. \u5982\u679cbdHolder\u4e0d\u4e3a\u7a7a\uff0c\u82e5\u5b58\u5728\u9ed8\u8ba4\u6807\u7b7e\u7684\u5b50\u8282\u70b9\u4e0b\u518d\u6709\u81ea\u5b9a\u4e49\u5c5e\u6027\uff0c\u8fd8\u9700\u8981\u518d\u6b21\u5bf9\u81ea\u5b9a\u4e49\u6807\u7b7e\u8fdb\u884c\u89e3\u6790\u3002<\/li>\n
      3. \u89e3\u6790\u540e\uff0c\u5bf9bdHolder\u8fdb\u884c\u6ce8\u518c\u3002\u6ce8\u518c\u64cd\u4f5c\u59d4\u6258\u7ed9\u4e86BeanDefinitionReaderUtils\u7684registerBeanDefinition\u65b9\u6cd5\u3002<\/li>\n
      4. \u53d1\u51fa\u54cd\u5e94\u4e8b\u4ef6\uff0c\u901a\u77e5\u76f8\u5173\u76d1\u542c\u5668\uff0c\u8fd9\u4e2abean\u5df2\u7ecf\u52a0\u8f7d\u5b8c\u4e86\u3002<\/li>\n<\/ol>\n
        protected void processBeanDefinition(Element ele, BeanDefinitionParserDelegate delegate) {\n\/\/ \u89e3\u6790\u5143\u7d20\u4fe1\u606f\uff0c\u7528bdHolder\u5c01\u88c5\nBeanDefinitionHolder bdHolder = delegate.parseBeanDefinitionElement(ele);\nif (bdHolder != null) {\n\/\/ \u5982\u679c\u6807\u7b7e\u4e0b\u6709\u81ea\u5b9a\u4e49\u5c5e\u6027\uff0c\u5219\u5bf9\u81ea\u5b9a\u4e49\u5c5e\u6027\u8fdb\u884c\u89e3\u6790\nbdHolder = delegate.decorateBeanDefinitionIfRequired(ele, bdHolder);\n\/\/ \u5bf9bdHolder\u8fdb\u884c\u6ce8\u518c\nBeanDefinitionReaderUtils.registerBeanDefinition(bdHolder, getReaderContext().getRegistry());\n\/\/ \u53d1\u9001\u6ce8\u518c\u4e8b\u4ef6\u7ed9\u76d1\u542c\u5668.\ngetReaderContext().fireComponentRegistered(new BeanComponentDefinition(bdHolder));\n}\n}<\/code><\/pre>\n
        1\uff09\u5143\u7d20\u89e3\u6790\u53ca\u4fe1\u606f\u63d0\u53d6<\/p>\n
        \u9996\u5148\u6211\u4eec\u4ece\u5143\u7d20\u89e3\u6790\u53ca\u4fe1\u606f\u63d0\u53d6\u5f00\u59cb\uff1adelegate.parseBeanDefinitionElement(ele)\u3002\u8fdb\u5165BeanDefinitionParserDelegate\u7c7bparseBeanDefinitionElement\u65b9\u6cd5\uff0c\u4e3b\u8981\u5b8c\u6210\u5982\u4e0b\u5185\u5bb9\uff1a<\/p>\n
          \n
        1. \u63d0\u53d6\u5143\u7d20\u7684id\u548cname\u5c5e\u6027<\/li>\n
        2. \u89e3\u6790\u5176\u4ed6\u6240\u6709\u5c5e\u6027\uff0c\u5c01\u88c5\u5230GenericBeanDefinition\u7c7b\u578b\u7684\u5b9e\u4f8b\u4e2d\uff0c\u5bf9\u5e94this.parseBeanDefinitionElement(ele, beanName, containingBean)\u65b9\u6cd5<\/li>\n
        3. \u5982\u679cbean\u6ca1\u6709\u6307\u5b9abeanName\uff0c\u5219\u4f7f\u7528\u9ed8\u8ba4\u89c4\u5219\u4e3a\u6b64Bean\u751f\u6210beanName<\/li>\n
        4. \u5c06\u83b7\u53d6\u5230\u7684\u4fe1\u606f\u5c01\u88c5\u5230BeanDefinitionHolder\u5b9e\u4f8b\u4e2d<\/li>\n<\/ol>\n
          beanName\u53d6\u503c\u7b56\u7565\u662f\uff0c\u9996\u5148\u53d6id\uff0c\u5982\u679c\u6ca1\u6709\u6307\u5b9aid\u5219\u53d6name[0]\uff08\u56e0\u4e3aname\u53ef\u4ee5\u6307\u5b9a\u591a\u4e2a\uff09\uff0c\u5982\u679cname\u4e5f\u6ca1\u6709\u6307\u5b9a\uff0c\u5219\u91c7\u53d6\u81ea\u52a8\u751f\u6210\u65b9\u5f0f\u751f\u6210\u3002<\/p>\n
          \u6700\u7ec8bean\u5143\u7d20\u7684\u6240\u6709\u5c5e\u6027\u548c\u5b50\u5143\u7d20\u4fe1\u606f\u90fd\u4fdd\u5b58\u5230GenericBeanDefinition\u4e2d\u4e86\u3002\u81f3\u6b64\u5c31\u5b8c\u6210\u4e86XML\u6587\u6863\u5230GenericBeanDefinition\u7684\u8f6c\u6362\u3002<\/p>\n
          2\uff09\u9ed8\u8ba4\u6807\u7b7e\u4e2d\u81ea\u5b9a\u4e49\u6807\u7b7e\u5143\u7d20\u7684\u89e3\u6790<\/p>\n
          \u5982\u679c\u8fd9\u4e2abean\u4f7f\u7528\u7684\u662f\u9ed8\u8ba4\u7684\u6807\u7b7e\u914d\u7f6e\uff0c\u4f46\u662f\u5176\u4e2d\u7684\u5b50\u5143\u7d20\u5374\u4f7f\u7528\u4e86\u81ea\u5b9a\u4e49\u914d\u7f6e\uff0c\u8fd9\u65f6\u8fd9\u90e8\u5206\u5185\u5bb9\u5c31\u8d77\u4f5c\u7528\u4e86\u3002\u5165\u53e3\u662fdelegate.decorateBeanDefinitionIfRequired(ele, bdHolder)\u65b9\u6cd5\u3002\u5b83\u5206\u522b\u5bf9\u5143\u7d20\u7684\u6240\u6709\u5c5e\u6027\u548c\u5b50\u5143\u7d20\u8fdb\u884c\u4e86decorateIfRequired\u65b9\u6cd5\u7684\u8c03\u7528\u3002decorateIfRequired\u65b9\u6cd5\u4f1a\u5224\u65ad\uff0c\u5982\u679c\u662f\u81ea\u5b9a\u4e49\u8282\u70b9\uff0c\u5219\u627e\u51fa\u81ea\u5b9a\u4e49\u7c7b\u578b\u6240\u5bf9\u5e94\u7684NamespaceHandler\u5e76\u8fdb\u884c\u8fdb\u4e00\u6b65\u89e3\u6790\u3002<\/p>\n
          public BeanDefinitionHolder decorateIfRequired(\nNode node, BeanDefinitionHolder originalDef, BeanDefinition containingBd) {\nString namespaceUri = getNamespaceURI(node);\nif (!isDefaultNamespace(namespaceUri)) {\n\/\/ \u5982\u679c\u5143\u7d20\u662f\u81ea\u5b9a\u4e49\u5143\u7d20\uff0c\u5219\u6839\u636e\u547d\u540d\u7a7a\u95f4\u627e\u5230\u5bf9\u5e94\u7684\u547d\u540d\u7a7a\u95f4\u5904\u7406\u5668\nNamespaceHandler handler = this.readerContext.getNamespaceHandlerResolver().resolve(namespaceUri);\nif (handler != null) {\n\/\/ \u81ea\u5b9a\u4e49\u547d\u540d\u7a7a\u95f4\u5904\u7406\u5668\u5904\u7406bdHolder\nreturn handler.decorate(node, originalDef, new ParserContext(this.readerContext, this, containingBd));\n}\n}\nreturn originalDef;\n}<\/code><\/pre>\n
          3\uff09BeanDefinition\u7684\u6ce8\u518c<\/p>\n
          BeanDefinition\u6ce8\u518c\u5206\u4e3a\u901a\u8fc7beanName\u6ce8\u518cBeanDefinition\u548c\u6ce8\u518c\u522b\u540d\u4e24\u90e8\u5206\u3002\u8fdb\u5165BeanDefinitionReaderUtils.registerBeanDefinition(bdHolder, this.getReaderContext().getRegistry())\u65b9\u6cd5\u5185\u90e8\uff0c\u5982\u4e0b<\/p>\n
          public static void registerBeanDefinition(\nBeanDefinitionHolder definitionHolder, BeanDefinitionRegistry registry)\nthrows BeanDefinitionStoreException {\nString beanName = definitionHolder.getBeanName();\n\/\/ \u901a\u8fc7beanName\u6ce8\u518cBeanDefinition\nregistry.registerBeanDefinition(beanName, definitionHolder.getBeanDefinition());\nString[] aliases = definitionHolder.getAliases();\nif (aliases != null) {\nfor (String alias : aliases) {\n\/\/ \u6ce8\u518c\u522b\u540d\nregistry.registerAlias(beanName, alias);\n}\n}\n}<\/code><\/pre>\n
          \u901a\u8fc7beanName\u6ce8\u518cBeanDefinition\u4e3b\u8981\u8fdb\u884c\u4e864\u4e2a\u6b65\u9aa4\uff1a<\/p>\n
            \n
          1. \u5bf9AbstractBeanDefinition\u7684\u6821\u9a8c\uff0c\u4e3b\u8981\u662f\u5bf9\u4e8eAbstractBeanDefinition\u7684methodOverrides\u5c5e\u6027\u7684<\/li>\n
          2. \u5bf9\u4e8ebeanName\u5df2\u7ecf\u6ce8\u518c\u7684\u60c5\u51b5\u7684\u5904\u7406\uff0c\u5982\u679c\u5df2\u7ecf\u8bbe\u7f6e\u4e86\u4e0d\u5141\u8bb8bean\u7684\u8986\u76d6\uff0c\u4f1a\u629b\u51fa\u5f02\u5e38\uff0c\u5426\u5219\u8fdb\u884c\u8986\u76d6<\/li>\n
          3. \u52a0\u5165Map\u7f13\u5b58\uff0cbeanName\u4e3akey\uff0cBeanDefinition\u4e3avalue<\/li>\n
          4. \u6e05\u9664\u4e4b\u524d\u7559\u4e0b\u7684\u5bf9\u5e94beanName\u7684\u7f13\u5b58<\/li>\n<\/ol>\n
            public void registerBeanDefinition(String beanName, BeanDefinition beanDefinition) {\nif (beanDefinition instanceof AbstractBeanDefinition) {\n\/\/ \u5bf9AbstractBeanDefinition\u7684\u6821\u9a8c\n((AbstractBeanDefinition) beanDefinition).validate();\n}\nBeanDefinition oldBeanDefinition = this.beanDefinitionMap.get(beanName);\nif (oldBeanDefinition != null) {\nif (!isAllowBeanDefinitionOverriding()) {\n\/\/ \u5982\u679cbeanName\u5df2\u7ecf\u6ce8\u518c\uff0c\u5e76\u4e14\u8bbe\u7f6e\u4e86\u4e0d\u5141\u8bb8bean\u8986\u76d6\uff0c\u4f1a\u629b\u51fa\u5f02\u5e38\nthrow new BeanDefinitionStoreException(beanDefinition.getResourceDescription(), beanName,\n"Cannot register bean definition [" + beanDefinition + "] for bean '" + beanName +\n"': There is already [" + oldBeanDefinition + "] bound.");\n}\n\/\/ \u5c06beanDefinition\u5b58\u5230Map\uff0cbeanName\u4e3akey\nthis.beanDefinitionMap.put(beanName, beanDefinition);\n}\nelse {\nif (hasBeanCreationStarted()) {\nsynchronized (this.beanDefinitionMap) {\n\/\/ \u5c06beanDefinition\u5b58\u5230Map\uff0cbeanName\u4e3akey\nthis.beanDefinitionMap.put(beanName, beanDefinition);\n}\n}\nelse {\n\/\/ \u5c06beanDefinition\u5b58\u5230Map\uff0cbeanName\u4e3akey\nthis.beanDefinitionMap.put(beanName, beanDefinition);\n}\n}\nif (oldBeanDefinition != null || containsSingleton(beanName)) {\n\/\/ \u6e05\u9664\u4e4b\u524d\u7559\u4e0b\u7684\u5bf9\u5e94beanName\u7684\u7f13\u5b58\nresetBeanDefinition(beanName);\n}\n}<\/code><\/pre>\n
            \u6ce8\u518c\u522b\u540d\u7684\u539f\u7406\u76f8\u5bf9\u7b80\u5355\uff0c\u5206\u4e3a4\u4e2a\u6b65\u9aa4\uff1a<\/p>\n
              \n
            1. alias\u548cbeanName\u76f8\u540c\u60c5\u51b5\u5904\u7406\uff0c\u6b64\u65f6\u4f1a\u5220\u9664\u539f\u6709\u7684alias<\/li>\n
            2. alias\u8986\u76d6\u5904\u7406\uff0c\u82e5aliasName\u5df2\u7ecf\u4f7f\u7528\u4e86\u5e76\u5df2\u7ecf\u6307\u5411\u4e86\u53e6\u4e00\u4e2abeanName\uff0c\u4e14\u8bbe\u7f6e\u4e86\u522b\u540d\u4e0d\u80fd\u8986\u76d6\uff0c\u5219\u4f1a\u629b\u51fa\u5f02\u5e38<\/li>\n
            3. alias\u5faa\u73af\u68c0\u67e5\uff0c\u5982\u679c\u51fa\u73b0\u4e86\u522b\u540d\u5faa\u73af\u7684\u60c5\u51b5\uff0c\u5219\u629b\u51fa\u5f02\u5e38<\/li>\n
            4. \u6ce8\u518calias<\/li>\n<\/ol>\n
              public void registerAlias(String name, String alias) {\nif (alias.equals(name)) {\nthis.aliasMap.remove(alias);\n} else {\nString registeredName = (String)this.aliasMap.get(alias);\nif (registeredName != null) {\nif (registeredName.equals(name)) {\nreturn;\n}\n\/\/ \u82e5aliasName\u5df2\u7ecf\u4f7f\u7528\u4e86\u5e76\u5df2\u7ecf\u6307\u5411\u4e86\u53e6\u4e00\u4e2abeanName\uff0c\u4e14\u8bbe\u7f6e\u4e86\u522b\u540d\u4e0d\u80fd\u8986\u76d6\uff0c\u5219\u4f1a\u629b\u51fa\u5f02\u5e38\nif (!this.allowAliasOverriding()) {\nthrow new IllegalStateException("Cannot register alias '" + alias + "' for name '" + name + "': It is already registered for name '" + registeredName + "'.");\n}\n}\n\/\/ alias\u5faa\u73af\u68c0\u67e5\nthis.checkForAliasCircle(name, alias);\n\/\/ alias\u6ce8\u518c\nthis.aliasMap.put(alias, name);\n}\n\n}<\/code><\/pre>\n
              4\uff09\u901a\u77e5\u76d1\u542c\u5668\u89e3\u6790\u53ca\u6ce8\u518c\u5b8c\u6210<\/p>\n
              \u901a\u8fc7\u4ee3\u7801this.getReaderContext().fireComponentRegistered(new BeanComponentDefinition(bdHolder))\u5b8c\u6210\u6b64\u529f\u80fd\u3002\u8fd9\u91cc\u7684\u5b9e\u73b0\u53ea\u662f\u4e3a\u4e86\u6269\u5c55\uff0c\u5f53\u9700\u8981\u5bf9\u6ce8\u518cBeanDefinition\u4e8b\u4ef6\u8fdb\u884c\u76d1\u542c\u65f6\u53ef\u4ee5\u901a\u8fc7\u6ce8\u518c\u76d1\u542c\u5668\u7684\u65b9\u5f0f\u5e76\u5c06\u5904\u7406\u903b\u8f91\u5199\u5165\u76d1\u542c\u5668\u4e2d\uff0c\u76ee\u524dSpring\u6ca1\u6709\u5bf9\u6b64\u4e8b\u4ef6\u8fdb\u884c\u4efb\u4f55\u5904\u7406\u3002<\/p>\n
              2.7.2 alias\u6807\u7b7e\u7684\u89e3\u6790<\/strong><\/p>\n
              \u5bf9alias\u6807\u7b7e\u7684\u89e3\u6790\u662f\u901a\u8fc7processAliasRegistration(ele)\u65b9\u6cd5\u5904\u7406\u7684\u3002<\/p>\n
              \nprotected void processAliasRegistration(Element ele) {\nString name = ele.getAttribute(NAME_ATTRIBUTE);\nString alias = ele.getAttribute(ALIAS_ATTRIBUTE);\nboolean valid = true;\nif (!StringUtils.hasText(name)) {\nvalid = false;\n}\nif (!StringUtils.hasText(alias)) {\nvalid = false;\n}\nif (valid) {\n\/\/ alias\u6807\u7b7e\u89e3\u6790\ngetReaderContext().getRegistry().registerAlias(name, alias);\n\/\/ \u901a\u77e5\u76d1\u542c\u5668\ngetReaderContext().fireAliasRegistered(name, alias, extractSource(ele));\n}\n}<\/code><\/pre>\n
              \u8fdb\u5165\u65b9\u6cd5\u5185\u90e8\u53ef\u4ee5\u770b\u5230\uff0cthis.getReaderContext().getRegistry().registerAlias(name, alias)\u65b9\u6cd5\u5b9e\u73b0\u4e86alias\u6807\u7b7e\u7684\u89e3\u6790\uff0c\u800c\u8fd9\u4e2a\u65b9\u6cd5\u5b9e\u9645\u5c31\u662f\u524d\u9762\u6ce8\u518c\u522b\u540d\u7684\u90a3\u4e2a\u65b9\u6cd5\u3002this.getReaderContext().fireAliasRegistered(name, alias, this.extractSource(ele))\u8fd9\u4e2a\u65b9\u6cd5\u7528\u4e8e\u5728\u522b\u540d\u6ce8\u518c\u540e\u901a\u77e5\u76d1\u542c\u5668\u505a\u76f8\u5e94\u7684\u5904\u7406\uff0c\u8fd9\u91cc\u7684\u5b9e\u73b0\u53ea\u662f\u4e3a\u4e86\u6269\u5c55\uff0c\u76ee\u524dSpring\u6ca1\u6709\u5bf9\u6b64\u4e8b\u4ef6\u8fdb\u884c\u4efb\u4f55\u5904\u7406\u3002<\/p>\n
              2.7.3 import\u6807\u7b7e\u7684\u89e3\u6790<\/strong><\/p>\n
              \u5bf9import\u6807\u7b7e\u7684\u89e3\u6790\uff0cSpring\u5927\u81f4\u5206\u4e3a\u4ee5\u4e0b\u6b65\u9aa4\uff1a<\/p>\n
                \n
              1. \u83b7\u53d6import\u6807\u7b7e\u7684resource\u5c5e\u6027\u914d\u7f6e\u7684\u8def\u5f84<\/li>\n
              2. \u89e3\u6790\u8def\u5f84\u4e2d\u7684\u7cfb\u7edf\u5c5e\u6027\uff0c\u683c\u5f0f\u5982\u201c${user.dir}\u201d\uff0c\u5bf9\u5e94\u65b9\u6cd5this.getReaderContext().getEnvironment().resolveRequiredPlaceholders(location)<\/li>\n
              3. \u5224\u65adresource\u5c5e\u6027\u914d\u7f6e\u7684\u8def\u5f84\u662f\u7edd\u5bf9\u8def\u5f84\u8fd8\u662f\u76f8\u5bf9\u8def\u5f84<\/li>\n
              4. \u5982\u679c\u662f\u7edd\u5bf9\u8def\u5f84\uff0c\u5219\u8c03\u7528bean\u7684\u89e3\u6790\u8fc7\u7a0b\u8fdb\u884c\u89e3\u6790<\/li>\n
              5. \u5982\u679c\u662f\u76f8\u5bf9\u8def\u5f84\u5219\u8ba1\u7b97\u51fa\u7edd\u5bf9\u8def\u5f84\u540e\u8fdb\u884c\u89e3\u6790<\/li>\n
              6. \u901a\u77e5\u76d1\u542c\u5668\uff0c\u89e3\u6790\u5b8c\u6210<\/li>\n<\/ol>\n
                \u4e0d\u7ba1\u662f\u7edd\u5bf9\u8def\u5f84\u4e0bimport\u6807\u7b7e\u7684\u89e3\u6790\u8fd8\u662f\u76f8\u5bf9\u8def\u5f84\u4e0bimport\u6807\u7b7e\u7684\u89e3\u6790\uff0c\u901a\u8fc7\u8ddf\u8e2a\u4ee3\u7801\u53d1\u73b0\uff0c\u6700\u540e\u90fd\u4f1a\u8c03\u5230XmlBeanDefinitionReader\u7c7b\u7684loadBeanDefinitions\u65b9\u6cd5\uff0c\u800c\u8fd9\u4e2a\u65b9\u6cd5\u5728\u52a0\u8f7dbean\u90e8\u5206\u5df2\u7ecf\u4e86\u89e3\u4e86\u3002<\/p>\n
                2.7.4 \u5d4c\u5165\u5f0fbeans\u6807\u7b7e\u7684\u89e3\u6790<\/strong><\/p>\n
                \u8be5\u6807\u7b7e\u89e3\u6790\u8c03\u7528\u7684\u662fDefaultBeanDefinitionDocumentReader\u7684doRegisterBeanDefinitions\u65b9\u6cd5\uff0c\u800c\u8fd9\u4e2a\u65b9\u6cd5\u5df2\u7ecf\u5728\u89e3\u6790\u53ca\u6ce8\u518cBeanDefinitions\u90e8\u5206\u4e86\u89e3\u4e86\u3002\u5d4c\u5165\u5f0fbeans\u6807\u7b7e\u548c\u975e\u5d4c\u5165\u5f0fbeans\u6807\u7b7e\u7684\u89e3\u6790\u8fc7\u7a0b\u5176\u5b9e\u662f\u4e00\u6837\u7684\u3002<\/p>\n
                2.8 \u81ea\u5b9a\u4e49\u6807\u7b7e\u7684\u89e3\u6790<\/h4>\n
                \u81ea\u5b9a\u4e49\u6807\u7b7e\u975e\u5e38\u6709\u7528\uff0c\u6211\u4eec\u719f\u77e5\u7684\u6807\u7b7e\u5c31\u662f\u91c7\u7528\u81ea\u5b9a\u4e49\u6807\u7b7e\u7684\u539f\u7406\u5b9e\u73b0\u7684\u3002\u4e0b\u9762\u6765\u63a2\u7a76\u4e00\u4e0b\u81ea\u5b9a\u4e49\u6807\u7b7e\u7684\u89e3\u6790\u539f\u7406\u3002  
                \u524d\u9762\u63d0\u5230\u8fc7\u89e3\u6790\u81ea\u5b9a\u4e49\u6807\u7b7e\u7684\u5165\u53e3\uff0c\u67e5\u770b\u4ee5\u4e0b\u5177\u4f53\u5b9e\u73b0\uff1a<\/p>\n
                \npublic BeanDefinition parseCustomElement(Element ele, BeanDefinition containingBd) {\nString namespaceUri = this.getNamespaceURI(ele);\nNamespaceHandler handler = this.readerContext.getNamespaceHandlerResolver().resolve(namespaceUri);\nif (handler == null) {\nreturn null;\n} else {\nreturn handler.parse(ele, new ParserContext(this.readerContext, this, containingBd));\n}\n}<\/code><\/pre>\n
                \u8fd9\u91cc\u4f20\u5165\u7684containingBd\u4e3anull\u3002\u53ef\u4ee5\u770b\u5230\u81ea\u5b9a\u4e49\u6807\u7b7e\u89e3\u6790\u7684\u601d\u8def\u7279\u522b\u7b80\u5355\u3002\u65e0\u975e\u662f\u6839\u636e\u6807\u7b7e\u5143\u7d20\u83b7\u53d6\u5bf9\u5e94\u7684\u547d\u540d\u7a7a\u95f4\uff0c\u6839\u636e\u547d\u540d\u7a7a\u95f4\u89e3\u6790\u5bf9\u5e94\u7684\u5904\u7406\u5668\uff0c\u7136\u540e\u6839\u636e\u7528\u6237\u81ea\u5b9a\u4e49\u7684\u5904\u7406\u5668\u8fdb\u884c\u89e3\u6790\u3002<\/p>\n
                2.8.1 \u89e3\u6790\u81ea\u5b9a\u4e49\u6807\u7b7e\u5904\u7406\u5668<\/strong><\/p>\n
                \u901a\u8fc7\u5143\u7d20\u53ef\u4ee5\u83b7\u53d6\u5b83\u7684\u547d\u540d\u7a7a\u95f4\uff0c\u6709\u4e86\u547d\u540d\u7a7a\u95f4\u5c31\u53ef\u4ee5\u8fdb\u884cNamespaceHandler\u63d0\u53d6\u4e86\u3002\u5728readerContext\u521d\u59cb\u5316\u7684\u65f6\u5019\u5176\u5c5e\u6027namespaceHandlerResolver\u88ab\u521d\u59cb\u5316\u4e3aDefaultNamespaceHandlerResolver\u7684\u5b9e\u4f8b\u3002\u6240\u4ee5\u8c03\u7528resolve\u65b9\u6cd5\u5b9e\u9645\u8c03\u7528\u7684\u662fDefaultNamespaceHandlerResolver\u7684\u65b9\u6cd5\u3002<\/p>\n
                public NamespaceHandler resolve(String namespaceUri) {\n\/\/ \u83b7\u53d6\u547d\u540d\u7a7a\u95f4\u5230\u5904\u7406\u5668\u7684\u6620\u5c04\u5173\u7cfb\nMap<String, Object> handlerMappings = getHandlerMappings();\nObject handlerOrClassName = handlerMappings.get(namespaceUri);\nif (handlerOrClassName == null) {\nreturn null;\n}\nelse if (handlerOrClassName instanceof NamespaceHandler) {\nreturn (NamespaceHandler) handlerOrClassName;\n}\nelse {\nString className = (String) handlerOrClassName;\nClass<?> handlerClass = ClassUtils.forName(className, this.classLoader);\nif (!NamespaceHandler.class.isAssignableFrom(handlerClass)) {\nthrow new FatalBeanException("Class [" + className + "] for namespace [" + namespaceUri +\n"] does not implement the [" + NamespaceHandler.class.getName() + "] interface");\n}\n\/\/ \u5b9e\u4f8b\u5316\u547d\u540d\u7a7a\u95f4\u5904\u7406\u5668\nNamespaceHandler namespaceHandler = (NamespaceHandler) BeanUtils.instantiateClass(handlerClass);\nnamespaceHandler.init();\nhandlerMappings.put(namespaceUri, namespaceHandler);\nreturn namespaceHandler;\n}\n}\n\nprivate Map<String, Object> getHandlerMappings() {\nif (this.handlerMappings == null) {\nsynchronized (this) {\nif (this.handlerMappings == null) {\n\/\/ \u52a0\u8f7d\u914d\u7f6e\u6587\u4ef6META-INF\/spring.handlers\nProperties mappings =\nPropertiesLoaderUtils.loadAllProperties(this.handlerMappingsLocation, this.classLoader);\nMap<String, Object> handlerMappings = new ConcurrentHashMap<String, Object>(mappings.size());\nCollectionUtils.mergePropertiesIntoMap(mappings, handlerMappings);\nthis.handlerMappings = handlerMappings;\n}\n}\n}\nreturn this.handlerMappings;\n}<\/code><\/pre>\n
                \u53ef\u4ee5\u770b\u5230\u81ea\u5b9a\u4e49\u6807\u7b7e\u5904\u7406\u5668\u7684\u89e3\u6790\u6d41\u7a0b\uff0c\u9996\u5148\u901a\u8fc7this.getHandlerMappings()\u65b9\u6cd5\u89e3\u6790\u914d\u7f6e\u6587\u4ef6\u83b7\u53d6\u547d\u540d\u7a7a\u95f4\u5230\u5904\u7406\u5668\u7684\u6620\u5c04\u5173\u7cfb\uff0cMap\u4fdd\u5b58\u3002\u7136\u540e\u5b9e\u4f8b\u5316\u8be5\u547d\u540d\u7a7a\u95f4\u5904\u7406\u5668\uff0c\u8c03\u7528init()\u521d\u59cb\u5316\u65b9\u6cd5\u3002\u800c\u5b9a\u4e49\u7684this.handlerMappingsLocation\u53d8\u91cf\u5728\u8c03\u7528\u6784\u9020\u65b9\u6cd5\u7684\u65f6\u5019\u4ee3\u7801\u5199\u6b7b\u4e86\uff0c\u662fMETA-INF\/spring.handlers\u3002\u8fd9\u4e2a\u914d\u7f6e\u6587\u4ef6\u662f\u7528\u6237\u81ea\u5df1\u53bb\u7f16\u5199\u7684\uff0c\u5b9a\u4e49\u547d\u540d\u7a7a\u95f4\u5230\u5904\u7406\u5668\u7c7b\u7684\u6620\u5c04\u3002\u547d\u540d\u7a7a\u95f4\u5904\u7406\u5668\u7c7b\u7684\u5b9e\u73b0\u4e5f\u662f\u9700\u8981\u7528\u6237\u53bb\u5b9e\u73b0\uff0c\u7528\u6237\u53ef\u4ee5\u7ee7\u627fNamespaceHandlerSupport\u62bd\u8c61\u7c7b\u5b9e\u73b0\u4e00\u4e0binit()\u62bd\u8c61\u65b9\u6cd5\u3002<\/p>\n
                2.8.2 \u6807\u7b7e\u89e3\u6790<\/strong><\/p>\n
                \u6211\u4eec\u5df2\u7ecf\u5f97\u5230\u4e86\u7531\u54ea\u4e2a\u6807\u7b7e\u5904\u7406\u5668\u8fdb\u884c\u5904\u7406\uff0c\u63a5\u4e0b\u6765\u6807\u7b7e\u89e3\u6790\u7531handler.parse(ele, new ParserContext(this.readerContext, this, containingBd))\u53bb\u5b9e\u73b0\u3002<\/p>\n
                public BeanDefinition parse(Element element, ParserContext parserContext) {\n\/\/ \u83b7\u53d6\u5143\u7d20\u89e3\u6790\u5668\uff0c\u8fdb\u884c\u89e3\u6790\nreturn findParserForElement(element, parserContext).parse(element, parserContext);\n}\n\nprivate BeanDefinitionParser findParserForElement(Element element, ParserContext parserContext) {\n\/\/ \u6839\u636e\u8282\u70b9\u540d\u79f0\u83b7\u53d6parser\nString localName = parserContext.getDelegate().getLocalName(element);\nBeanDefinitionParser parser = this.parsers.get(localName);\nreturn parser;\n}<\/code><\/pre>\n
                \u5728\u7236\u7c7bNamespaceHandlerSupport\u4e2d\u53ef\u4ee5\u770b\u5230\uff0c\u89e3\u6790\u529f\u80fd\u9996\u5148\u627e\u5230\u89e3\u6790\u5668\uff0c\u7136\u540e\u8fdb\u884c\u89e3\u6790\u3002\u67e5\u627e\u89e3\u6790\u5668\u9996\u5148\u83b7\u53d6\u8282\u70b9\u540d\u79f0\uff0c\u7136\u540e\u901a\u8fc7Map parsers\u83b7\u53d6\u5bf9\u5e94\u8282\u70b9\u7684\u89e3\u6790\u5668\u3002\u800c\u8fd9\u4e2aMap\u7684\u8d4b\u503c\u4e00\u822c\u5728\u7528\u6237\u5b9e\u73b0\u7684\u547d\u540d\u7a7a\u95f4\u5904\u7406\u5668init()\u65b9\u6cd5\u4e2d\u8c03\u7528\u3002<\/p>\n
                \u800c\u81ea\u5b9a\u4e49\u6807\u7b7e\u7684\u89e3\u6790\u4efb\u52a1\u7531parse\u65b9\u6cd5\u5b8c\u6210\u3002\u53ef\u4ee5\u770b\u5230\uff0c\u9996\u5148\u901a\u8fc7parseInternal\u65b9\u6cd5\u5c06\u6807\u7b7e\u5143\u7d20\u8f6c\u6362\u6210\u4e86BeanDefinition\uff0c\u7136\u540e\u89e3\u6790id\u548cname\u5c5e\u6027\u5e76\u7528BeanDefinitionHolder\u5c01\u88c5\u5143\u7d20\u4fe1\u606f\uff0c\u63a5\u7740\u8fdb\u884cBeanDefinition\u7684\u6ce8\u518c\uff0c\u6700\u540e\u901a\u77e5\u76d1\u542c\u5668\u3002<\/p>\n
                public final BeanDefinition parse(Element element, ParserContext parserContext) {\n\/\/ \u89e3\u6790\u5143\u7d20\nAbstractBeanDefinition definition = this.parseInternal(element, parserContext);\nif (definition != null && !parserContext.isNested()) {\n\/\/ \u89e3\u6790id\nString id = this.resolveId(element, definition, parserContext);\nString[] aliases = null;\nif (this.shouldParseNameAsAliases()) {\n\/\/ \u89e3\u6790name\nString name = element.getAttribute("name");\nif (StringUtils.hasLength(name)) {\naliases = StringUtils.trimArrayElements(StringUtils.commaDelimitedListToStringArray(name));\n}\n}\n\/\/ holder\u5c01\u88c5\u5143\u7d20\u4fe1\u606f\nBeanDefinitionHolder holder = new BeanDefinitionHolder(definition, id, aliases);\n\/\/ \u6ce8\u518c\nthis.registerBeanDefinition(holder, parserContext.getRegistry());\nif (this.shouldFireEvents()) {\nBeanComponentDefinition componentDefinition = new BeanComponentDefinition(holder);\nthis.postProcessComponentDefinition(componentDefinition);\n\/\/ \u901a\u77e5\u76d1\u542c\u5668\nparserContext.registerComponent(componentDefinition);\n}\n}\nreturn definition;\n}<\/code><\/pre>\n
                \u5bf9\u4e8e\u540e\u9762\u4e09\u6b65\u524d\u9762\u90fd\u4ecb\u7ecd\u8fc7\u4e86\uff0c\u53ea\u9700\u770b\u4e0bparseInternal\u65b9\u6cd5\u903b\u8f91\u3002<\/p>\n
                protected final AbstractBeanDefinition parseInternal(Element element, ParserContext parserContext) {\nBeanDefinitionBuilder builder = BeanDefinitionBuilder.genericBeanDefinition();\n\/\/ \u89e3\u6790parentName\nString parentName = this.getParentName(element);\nif (parentName != null) {\nbuilder.getRawBeanDefinition().setParentName(parentName);\n}\n\/\/ \u89e3\u6790beanClass\nClass<?> beanClass = this.getBeanClass(element);\nif (beanClass != null) {\nbuilder.getRawBeanDefinition().setBeanClass(beanClass);\n} else {\nString beanClassName = this.getBeanClassName(element);\nif (beanClassName != null) {\nbuilder.getRawBeanDefinition().setBeanClassName(beanClassName);\n}\n}\n\/\/ \u89e3\u6790source\nbuilder.getRawBeanDefinition().setSource(parserContext.extractSource(element));\nif (parserContext.isNested()) {\nbuilder.setScope(parserContext.getContainingBeanDefinition().getScope());\n}\n\/\/ \u89e3\u6790lazyInit\nif (parserContext.isDefaultLazyInit()) {\nbuilder.setLazyInit(true);\n}\n\nthis.doParse(element, parserContext, builder);\nreturn builder.getBeanDefinition();\n}\n\nprotected void doParse(Element element, ParserContext parserContext, BeanDefinitionBuilder builder) {\nthis.doParse(element, builder);\n}\n\nprotected void doParse(Element element, BeanDefinitionBuilder builder) {\n}<\/code><\/pre>\n
                \u53ef\u4ee5\u770b\u5230\uff0cparseInternal\u65b9\u6cd5\u5b9e\u9645\u5c31\u662f\u5148\u89e3\u6790parentName\u3001beanClass\u3001source\u3001scope\u548clazyInit\uff0c\u4ee5BeanDefinition\u5c01\u88c5\u3002\u7136\u540e\u8c03\u7528doParse\u65b9\u6cd5\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u4e5f\u662f\u7528\u6237\u81ea\u5b9a\u4e49\u89e3\u6790\u5668\u9700\u8981\u5b9e\u73b0\u7684\u65b9\u6cd5\u3002\u6700\u540e\u8fd4\u56de\u8fd9\u4e2aBeanDefinition\u3002<\/p>\n
                3 \u603b\u7ed3<\/h3>\n
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                \u6211\u4eec\u4ece\u4e2d\u4e0d\u4ec5\u53ef\u4ee5\u5b66\u5230Spring\u5bb9\u5668\u521b\u5efa\u7684\u57fa\u672c\u539f\u7406\uff0c\u8fd8\u53ef\u4ee5\u5b66\u5230\u8bb8\u591a\u7f16\u7801\u89c4\u8303\u53ca\u6280\u5de7\uff0c\u4e86\u89e3\u5230\u597d\u7684\u4ee3\u7801\u662f\u4ec0\u4e48\u6837\u5b50\u7684\u3002\u6bd4\u5982\u5176\u4e2d\u5e94\u7528\u5230\u7684\u5355\u4e00\u804c\u8d23\u539f\u5219\u3001\u6a21\u677f\u65b9\u6cd5\u6a21\u5f0f\u7b49\u7b49\u3002\u800c\u4e14\u8fd8\u53ef\u4ee5\u53d1\u73b0\uff0c\u5b83\u7684\u4ee3\u7801\u903b\u8f91\u5f88\u6e05\u6670\uff0c\u5f80\u5f80\u901a\u8fc7\u5b83\u7684\u65b9\u6cd5\u540d\u79f0\u5c31\u77e5\u9053\u8fd9\u4e2a\u65b9\u6cd5\u7684\u529f\u80fd\uff0c\u5e76\u4e14\u6bcf\u4e2a\u65b9\u6cd5\u4e5f\u4e0d\u4f1a\u7279\u522b\u957f\uff0c\u589e\u52a0\u4e86\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002\u5e76\u4e14\u4ee3\u7801\u5c01\u88c5\u6027\u5f88\u597d\uff0c\u5f88\u591a\u590d\u6742\u7684\u529f\u80fd\u4ee3\u7801\u90fd\u53ef\u4ee5\u590d\u7528\u3002<\/p>\n
                \u5728\u6211\u4eec\u4e4b\u540e\u7684\u5f00\u53d1\u5de5\u4f5c\u4e2d\u9700\u8981\u4e0d\u65ad\u5b66\u4e60\u597d\u7684\u7f16\u7801\u6280\u5de7\u53ca\u89c4\u8303\uff0c\u5e94\u7528\u5230\u65e5\u5e38\u5f00\u53d1\u5de5\u4f5c\u5f53\u4e2d\uff0c\u6700\u7ec8\u5f62\u6210\u6211\u4eec\u81ea\u5df1\u7684\u7f16\u7801\u6280\u5de7\u53ca\u98ce\u683c\u3002<\/p>\n
                4 \u53c2\u8003\u8d44\u6599<\/h3>\n
                \u300aSpring\u6280\u672f\u5185\u5e55\uff1a\u6df1\u5165\u89e3\u6790Spring\u67b6\u6784\u4e0e\u8bbe\u8ba1\u539f\u7406\u300b  
                \u300aSpring\u6e90\u7801\u6df1\u5ea6\u89e3\u6790\u300b<\/p>\n
                \n
                \u4f5c\u8005\uff1a\u66f9\u94ed\uff08\u5927\u4ef6\u6280\u672f\u5de5\u574a\uff09<\/p>\n
                https:\/\/segmentfault.com\/a\/1190000042799611<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
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