{"id":1629,"date":"2024-12-01T10:55:37","date_gmt":"2024-12-01T02:55:37","guid":{"rendered":"https:\/\/www.fanyamin.com\/wordpress\/?p=1629"},"modified":"2024-12-01T11:03:40","modified_gmt":"2024-12-01T03:03:40","slug":"enableautoconfiguration-%e6%b3%a8%e8%a7%a3%e7%9a%84%e5%8e%9f%e7%90%86","status":"publish","type":"post","link":"https:\/\/www.fanyamin.com\/wordpress\/?p=1629","title":{"rendered":"EnableAutoConfiguration \u6ce8\u89e3\u7684\u539f\u7406"},"content":{"rendered":"

\u5728 Spring Boot \u4e2d\uff0c@EnableAutoConfiguration \u662f\u4e00\u4e2a\u6838\u5fc3\u6ce8\u89e3\uff0c\u5b83\u5b9e\u73b0\u4e86\u81ea\u52a8\u914d\u7f6e\u7684\u529f\u80fd\u3002\u5b83\u7684\u4f5c\u7528\u662f\u6839\u636e\u9879\u76ee\u4e2d\u4f9d\u8d56\u7684\u5e93\u4ee5\u53ca\u5e94\u7528\u4e0a\u4e0b\u6587\u4e2d\u7684\u914d\u7f6e\uff0c\u81ea\u52a8\u914d\u7f6e Spring \u5e94\u7528\u7a0b\u5e8f\u7684\u4e0a\u4e0b\u6587\u3002\u4ee5\u4e0b\u662f\u5b83\u7684\u539f\u7406\u548c\u8fd0\u884c\u673a\u5236\uff1a<\/p>\n

1. @EnableAutoConfiguration \u7684\u5b9a\u4e49<\/h2>\n

@EnableAutoConfiguration \u6ce8\u89e3\u672c\u8d28\u4e0a\u662f\u4e00\u4e2a\u590d\u5408\u6ce8\u89e3\uff0c\u5176\u6e90\u7801\u5982\u4e0b\uff1a<\/p>\n

@Target(ElementType.TYPE)\n@Retention(RetentionPolicy.RUNTIME)\n@Documented\n@Inherited\n@AutoConfigurationPackage\n@Import(AutoConfigurationImportSelector.class)\npublic @interface EnableAutoConfiguration {\n    Class<?>[] exclude() default {};\n    String[] excludeName() default {};\n}<\/code><\/pre>\n
\u4e3b\u8981\u5305\u62ec\u4ee5\u4e0b\u4e24\u90e8\u5206\uff1a<\/p>\n
\u2022   @AutoConfigurationPackage: \u81ea\u52a8\u5c06\u5f53\u524d\u7c7b\u6240\u5728\u5305\u53ca\u5176\u5b50\u5305\u4e2d\u7684\u6240\u6709\u7ec4\u4ef6\u6ce8\u518c\u5230 Spring \u5bb9\u5668\u3002\n\u2022   @Import(AutoConfigurationImportSelector.class): \u5bfc\u5165\u4e86 AutoConfigurationImportSelector\uff0c\u7528\u6765\u52a0\u8f7d\u6240\u6709\u53ef\u7528\u7684\u81ea\u52a8\u914d\u7f6e\u7c7b\u3002<\/code><\/pre>\n
2. \u81ea\u52a8\u914d\u7f6e\u7684\u6838\u5fc3\u673a\u5236<\/h2>\n
2.1 \u81ea\u52a8\u914d\u7f6e\u7c7b\u7684\u5b9a\u4e49<\/h3>\n
\u81ea\u52a8\u914d\u7f6e\u7c7b\u901a\u8fc7 spring.factories \u6587\u4ef6\u5b9a\u4e49\uff0c\u8fd9\u4e2a\u6587\u4ef6\u901a\u5e38\u4f4d\u4e8e META-INF \u76ee\u5f55\u4e0b\u3002\u4f8b\u5982\uff1a<\/p>\n
org.springframework.boot.autoconfigure.EnableAutoConfiguration=\\
\norg.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration,\\
\norg.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration<\/p>\n
\u2022   \u6bcf\u4e2a\u7c7b\u90fd\u662f\u4e00\u4e2a\u81ea\u52a8\u914d\u7f6e\u7c7b\uff0cSpring Boot \u4f1a\u5728\u5e94\u7528\u542f\u52a8\u65f6\u52a0\u8f7d\u8fd9\u4e9b\u7c7b\u3002\n\u2022   \u81ea\u52a8\u914d\u7f6e\u7c7b\u672c\u8d28\u4e0a\u662f\u666e\u901a\u7684 @Configuration \u7c7b\uff0c\u5305\u542b\u82e5\u5e72\u4e2a\u6761\u4ef6\u6ce8\u89e3\uff08\u5982 @ConditionalOnClass\uff09\u3002<\/code><\/pre>\n
2.2 \u6761\u4ef6\u6ce8\u89e3 (@Conditional \u7cfb\u5217)<\/h3>\n
@EnableAutoConfiguration \u7684\u6838\u5fc3\u662f\u57fa\u4e8e\u6761\u4ef6\u7684\u914d\u7f6e\uff0c\u5b83\u901a\u8fc7\u4e00\u7cfb\u5217\u7684\u6761\u4ef6\u6ce8\u89e3\u51b3\u5b9a\u662f\u5426\u52a0\u8f7d\u67d0\u4e2a\u914d\u7f6e\u7c7b\uff0c\u4f8b\u5982\uff1a<\/p>\n
\u2022   @ConditionalOnClass: \u68c0\u67e5\u67d0\u4e2a\u7c7b\u662f\u5426\u5728\u7c7b\u8def\u5f84\u4e2d\uff08\u4f8b\u5982\u67d0\u4e2a\u4f9d\u8d56\u662f\u5426\u5b58\u5728\uff09\u3002\n\u2022   @ConditionalOnMissingBean: \u68c0\u67e5\u67d0\u4e2a bean \u662f\u5426\u5df2\u7ecf\u5b58\u5728\uff0c\u5982\u679c\u4e0d\u5b58\u5728\uff0c\u5219\u52a0\u8f7d\u914d\u7f6e\u3002\n\u2022   @ConditionalOnProperty: \u68c0\u67e5\u67d0\u4e2a\u914d\u7f6e\u5c5e\u6027\u662f\u5426\u5b58\u5728\u4ee5\u53ca\u662f\u5426\u5339\u914d\u7279\u5b9a\u503c\u3002<\/code><\/pre>\n
\u793a\u4f8b\uff08\u7b80\u5316\u7684\u81ea\u52a8\u914d\u7f6e\u7c7b\uff09\uff1a<\/p>\n
@Configuration\n@ConditionalOnClass(DataSource.class)\npublic class DataSourceAutoConfiguration {\n    @Bean\n    public DataSource dataSource() {\n        return new HikariDataSource();\n    }\n}<\/code><\/pre>\n
\u2022   \u5f53\u7c7b\u8def\u5f84\u4e2d\u5b58\u5728 DataSource \u7c7b\u65f6\uff0c\u81ea\u52a8\u914d\u7f6e\u4e00\u4e2a\u6570\u636e\u6e90 Bean\u3002<\/code><\/pre>\n
3. \u81ea\u52a8\u914d\u7f6e\u52a0\u8f7d\u7684\u8fc7\u7a0b<\/h2>\n
3.1 \u52a0\u8f7d spring.factories \u6587\u4ef6<\/h3>\n
Spring Boot \u542f\u52a8\u65f6\uff0c\u901a\u8fc7 SpringFactoriesLoader \u52a0\u8f7d spring.factories \u6587\u4ef6\u4e2d\u5b9a\u4e49\u7684\u81ea\u52a8\u914d\u7f6e\u7c7b\u3002<\/p>\n
3.2 \u8c03\u7528 AutoConfigurationImportSelector<\/h3>\n
@Import(AutoConfigurationImportSelector.class) \u7684\u4f5c\u7528\u662f\u52a8\u6001\u7b5b\u9009\u5e76\u52a0\u8f7d\u7b26\u5408\u6761\u4ef6\u7684\u81ea\u52a8\u914d\u7f6e\u7c7b\u3002<\/p>\n
\u2022   \u6b65\u9aa4 1: \u8bfb\u53d6\u6240\u6709\u7684\u81ea\u52a8\u914d\u7f6e\u7c7b\u3002\n\u2022   \u6b65\u9aa4 2: \u901a\u8fc7\u6761\u4ef6\u6ce8\u89e3\u7b5b\u9009\u7b26\u5408\u6761\u4ef6\u7684\u914d\u7f6e\u7c7b\u3002\n\u2022   \u6b65\u9aa4 3: \u5c06\u7b26\u5408\u6761\u4ef6\u7684\u914d\u7f6e\u7c7b\u5bfc\u5165\u5230 Spring \u5bb9\u5668\u4e2d\u3002<\/code><\/pre>\n
3.3 \u6ce8\u518c\u81ea\u52a8\u914d\u7f6e\u7684 Bean<\/h3>\n
Spring \u5bb9\u5668\u4f1a\u6839\u636e\u81ea\u52a8\u914d\u7f6e\u7c7b\u4e2d\u5b9a\u4e49\u7684 @Bean \u65b9\u6cd5\uff0c\u5c06\u6240\u9700\u7684 Bean \u6ce8\u518c\u5230\u5bb9\u5668\u4e2d\u3002<\/p>\n
4. \u81ea\u5b9a\u4e49\u81ea\u52a8\u914d\u7f6e\u884c\u4e3a<\/h2>\n
4.1 \u6392\u9664\u67d0\u4e9b\u81ea\u52a8\u914d\u7f6e\u7c7b<\/h3>\n
\u53ef\u4ee5\u4f7f\u7528 exclude \u6216 excludeName \u53c2\u6570\u6392\u9664\u7279\u5b9a\u7684\u81ea\u52a8\u914d\u7f6e\u7c7b\uff1a<\/p>\n
@EnableAutoConfiguration(exclude = {DataSourceAutoConfiguration.class})<\/code><\/pre>\n
4.2 \u81ea\u5b9a\u4e49\u914d\u7f6e\u4f18\u5148\u7ea7<\/h3>\n
\u901a\u8fc7\u8bbe\u7f6e application.properties \u6587\u4ef6\u4e2d\u7684\u5c5e\u6027\uff0c\u53ef\u4ee5\u63a7\u5236\u81ea\u52a8\u914d\u7f6e\u884c\u4e3a\u3002\u4f8b\u5982\uff1a<\/p>\n
spring.main.allow-bean-definition-overriding=true<\/code><\/pre>\n
5. \u5178\u578b\u7684\u5de5\u4f5c\u6d41\u7a0b<\/h3>\n
1.  \u542f\u52a8 Spring Boot \u5e94\u7528\u65f6\uff0c@EnableAutoConfiguration \u542f\u7528\u81ea\u52a8\u914d\u7f6e\u3002\n2.  Spring Boot \u901a\u8fc7 SpringFactoriesLoader \u52a0\u8f7d\u6240\u6709\u81ea\u52a8\u914d\u7f6e\u7c7b\u3002\n3.  AutoConfigurationImportSelector \u7b5b\u9009\u51fa\u7b26\u5408\u6761\u4ef6\u7684\u81ea\u52a8\u914d\u7f6e\u7c7b\u3002\n4.  Spring \u5bb9\u5668\u5c06\u81ea\u52a8\u914d\u7f6e\u7c7b\u4e2d\u7684 Bean \u6ce8\u518c\u5230\u4e0a\u4e0b\u6587\u3002<\/code><\/pre>\n
6. \u6ce8\u89e3\u5904\u7406\u5668\u903b\u8f91<\/h2>\n
@EnableAutoConfiguration \u7684\u903b\u8f91\u4e3b\u8981\u4f9d\u8d56\u4e8e AutoConfigurationImportSelector \u6765\u5b8c\u6210\u81ea\u52a8\u914d\u7f6e\u7c7b\u7684\u52a0\u8f7d\u548c\u6ce8\u518c\u3002\u4ee5\u4e0b\u662f\u7b80\u8981\u63cf\u8ff0\u5176\u6e90\u7801\u5b9e\u73b0\u7684\u6d41\u7a0b\uff1a<\/p>\n
    \n
  1. @EnableAutoConfiguration \u7684\u6838\u5fc3\u903b\u8f91<\/li>\n<\/ol>\n
    @EnableAutoConfiguration \u6ce8\u89e3\u901a\u8fc7 @Import(AutoConfigurationImportSelector.class) \u5c06\u81ea\u52a8\u914d\u7f6e\u7684\u9009\u62e9\u5668\u5f15\u5165\u5230 Spring \u5bb9\u5668\u4e2d\u3002<\/code><\/pre>\n
      \n
    1. AutoConfigurationImportSelector \u7684\u903b\u8f91<\/li>\n<\/ol>\n
      AutoConfigurationImportSelector \u662f\u81ea\u52a8\u914d\u7f6e\u529f\u80fd\u7684\u6838\u5fc3\uff0c\u5b83\u7684\u4e3b\u8981\u804c\u8d23\u662f\u52a0\u8f7d\u3001\u7b5b\u9009\u548c\u6ce8\u518c\u81ea\u52a8\u914d\u7f6e\u7c7b\u3002<\/p>\n
      \u5173\u952e\u65b9\u6cd5\u5b9e\u73b0<\/p>\n
      1.  selectImports \u65b9\u6cd5<\/code><\/pre>\n
      \u8fd9\u662f\u81ea\u52a8\u914d\u7f6e\u7c7b\u9009\u62e9\u7684\u5165\u53e3\u65b9\u6cd5\uff1a<\/p>\n
      @Override\npublic String[] selectImports(AnnotationMetadata annotationMetadata) {\n    AutoConfigurationEntry autoConfigurationEntry = getAutoConfigurationEntry(annotationMetadata);\n    return StringUtils.toStringArray(autoConfigurationEntry.getConfigurations());\n}<\/code><\/pre>\n
      \u2022   \u8c03\u7528 getAutoConfigurationEntry \u83b7\u53d6\u7b26\u5408\u6761\u4ef6\u7684\u81ea\u52a8\u914d\u7f6e\u7c7b\u5217\u8868\u3002\n\u2022   \u8fd4\u56de\u914d\u7f6e\u7c7b\u540d\u79f0\u6570\u7ec4\u3002\n\n2.  getAutoConfigurationEntry \u65b9\u6cd5<\/code><\/pre>\n
      \u8d1f\u8d23\u52a0\u8f7d\u548c\u7b5b\u9009\u81ea\u52a8\u914d\u7f6e\u7c7b\uff1a<\/p>\n
      protected AutoConfigurationEntry getAutoConfigurationEntry(AnnotationMetadata annotationMetadata) {\n    if (!isEnabled(annotationMetadata)) {\n        return EMPTY_ENTRY;\n    }\n    List<String> configurations = loadAutoConfigurations();\n    configurations = filter(configurations);\n    return new AutoConfigurationEntry(configurations);\n}<\/code><\/pre>\n
      \u2022   isEnabled: \u68c0\u67e5\u81ea\u52a8\u914d\u7f6e\u662f\u5426\u542f\u7528\uff08\u53ef\u4ee5\u901a\u8fc7\u5c5e\u6027 spring.boot.enableautoconfiguration \u63a7\u5236\uff09\u3002\n\u2022   loadAutoConfigurations: \u52a0\u8f7d META-INF\/spring.factories \u4e2d\u5b9a\u4e49\u7684\u6240\u6709\u81ea\u52a8\u914d\u7f6e\u7c7b\u3002\n\u2022   filter: \u901a\u8fc7\u6761\u4ef6\u6ce8\u89e3\u7b5b\u9009\u51fa\u5f53\u524d\u73af\u5883\u6709\u6548\u7684\u914d\u7f6e\u7c7b\u3002\n\n3.  loadAutoConfigurations \u65b9\u6cd5<\/code><\/pre>\n
      \u4f7f\u7528 SpringFactoriesLoader \u4ece spring.factories \u4e2d\u52a0\u8f7d\u81ea\u52a8\u914d\u7f6e\u7c7b\uff1a<\/p>\n
      private List<String> loadAutoConfigurations() {\n    return SpringFactoriesLoader.loadFactoryNames(\n            EnableAutoConfiguration.class, getClass().getClassLoader());\n}<\/code><\/pre>\n
      \u2022   \u8bfb\u53d6 META-INF\/spring.factories \u6587\u4ef6\u4e2d EnableAutoConfiguration \u5bf9\u5e94\u7684\u81ea\u52a8\u914d\u7f6e\u7c7b\u5217\u8868\u3002\n\n4.  \u7b5b\u9009\u903b\u8f91<\/code><\/pre>\n
      \u81ea\u52a8\u914d\u7f6e\u7c7b\u5728\u6ce8\u518c\u4e4b\u524d\uff0c\u4f1a\u6839\u636e\u4ee5\u4e0b\u6761\u4ef6\u8fdb\u884c\u7b5b\u9009\uff1a
      \n\u2022   @ConditionalOnClass: \u68c0\u67e5\u7c7b\u8def\u5f84\u4e2d\u662f\u5426\u5b58\u5728\u67d0\u4e9b\u4f9d\u8d56\u3002
      \n\u2022   @ConditionalOnMissingBean: \u68c0\u67e5\u5bb9\u5668\u4e2d\u662f\u5426\u5df2\u7ecf\u5b58\u5728\u7279\u5b9a\u7684 Bean\u3002
      \n\u2022   @ConditionalOnProperty: \u68c0\u67e5\u914d\u7f6e\u6587\u4ef6\u4e2d\u7684\u5c5e\u6027\u662f\u5426\u6ee1\u8db3\u6761\u4ef6\u3002
      \n\u2022   @Conditional: \u81ea\u5b9a\u4e49\u7684\u6761\u4ef6\u5224\u65ad\u903b\u8f91\u3002<\/p>\n
        \n
      1. \u81ea\u52a8\u914d\u7f6e\u7c7b\u7684\u6ce8\u518c<\/li>\n<\/ol>\n
        \u7ecf\u8fc7\u7b5b\u9009\u540e\uff0c\u7b26\u5408\u6761\u4ef6\u7684\u81ea\u52a8\u914d\u7f6e\u7c7b\u4f1a\u88ab\u8fd4\u56de\u5230 ConfigurationClassPostProcessor \u4e2d\uff0c\u7531 Spring \u5bb9\u5668\u89e3\u6790\u5e76\u6ce8\u518c\u4e3a\u914d\u7f6e\u7c7b\u3002<\/p>\n
        \u2022   \u6838\u5fc3\u6d41\u7a0b:\n\u2022   \u81ea\u52a8\u914d\u7f6e\u7c7b\u88ab\u89e3\u6790\u4e3a @Configuration \u914d\u7f6e\u7c7b\u3002\n\u2022   \u901a\u8fc7 @Bean \u5b9a\u4e49\u7684 Bean \u65b9\u6cd5\u88ab\u8c03\u7528\uff0cBean \u88ab\u6ce8\u518c\u5230 Spring \u5bb9\u5668\u4e2d\u3002\n\u2022   \u8fd9\u4e9b\u81ea\u52a8\u914d\u7f6e\u7c7b\u4e3a\u9879\u76ee\u63d0\u4f9b\u4e86\u5f00\u7bb1\u5373\u7528\u7684\u529f\u80fd\uff0c\u5982\u6570\u636e\u6e90\u3001\u4e8b\u52a1\u7ba1\u7406\u5668\u7b49\u3002<\/code><\/pre>\n
          \n
        1. \n
          \u4ee3\u7801\u6267\u884c\u7684\u6574\u4f53\u6d41\u7a0b<\/p>\n
            \n
          1. \u542f\u52a8\u65f6\uff0c@EnableAutoConfiguration \u6fc0\u6d3b\u3002<\/li>\n
          2. AutoConfigurationImportSelector \u88ab\u6267\u884c\u3002<\/li>\n
          3. \u901a\u8fc7 SpringFactoriesLoader \u52a0\u8f7d\u6240\u6709\u81ea\u52a8\u914d\u7f6e\u7c7b\u3002<\/li>\n
          4. \u7ed3\u5408\u73af\u5883\u6761\u4ef6\u7b5b\u9009\u51fa\u7b26\u5408\u6761\u4ef6\u7684\u914d\u7f6e\u7c7b\u3002<\/li>\n
          5. \u5c06\u7b26\u5408\u6761\u4ef6\u7684\u81ea\u52a8\u914d\u7f6e\u7c7b\u5bfc\u5165 Spring \u5bb9\u5668\u3002<\/li>\n
          6. Spring \u5bb9\u5668\u6839\u636e\u81ea\u52a8\u914d\u7f6e\u7c7b\u521b\u5efa\u76f8\u5173\u7684 Bean \u5e76\u5b8c\u6210\u521d\u59cb\u5316\u3002<\/li>\n<\/ol>\n<\/li>\n
          7. \n
            \u5c0f\u7ed3<\/p>\n
            \u2022   \u6838\u5fc3\u7ec4\u4ef6:
            \n\u2022   @Import(AutoConfigurationImportSelector.class) \u662f\u5165\u53e3\u3002
            \n\u2022   SpringFactoriesLoader \u52a0\u8f7d\u914d\u7f6e\u7c7b\u3002
            \n\u2022   @Conditional \u7cfb\u5217\u6ce8\u89e3\u51b3\u5b9a\u914d\u7f6e\u7c7b\u662f\u5426\u751f\u6548\u3002
            \n\u2022   \u4f18\u70b9:
            \n\u2022   \u81ea\u52a8\u914d\u7f6e\u901a\u8fc7\u6761\u4ef6\u5224\u65ad\uff0c\u907f\u514d\u52a0\u8f7d\u4e0d\u5fc5\u8981\u7684\u7ec4\u4ef6\u3002
            \n\u2022   \u4f7f\u7528\u4e86 spring.factories \u548c\u6a21\u5757\u5316\u8bbe\u8ba1\uff0c\u65b9\u4fbf\u6269\u5c55\u548c\u81ea\u5b9a\u4e49\u3002
            \n\u2022   \u6e90\u7801\u6d41\u7a0b\u56fe:<\/p>\n
            @EnableAutoConfiguration\n   \u2193\n@Import(AutoConfigurationImportSelector)\n   \u2193\nAutoConfigurationImportSelector.selectImports()\n   \u2193\nSpringFactoriesLoader.loadFactoryNames()\n   \u2193\n\u7b5b\u9009\u7b26\u5408\u6761\u4ef6\u7684\u81ea\u52a8\u914d\u7f6e\u7c7b\n   \u2193\n\u6ce8\u518c Bean \u5230 Spring \u5bb9\u5668<\/code><\/pre>\n<\/li>\n<\/ol>\n
            7. \u76f8\u5173\u6e90\u7801<\/h2>\n
            @EnableAutoConfiguration \u548c\u76f8\u5173\u7684\u81ea\u52a8\u914d\u7f6e\u903b\u8f91\u7684\u6e90\u4ee3\u7801\u4e3b\u8981\u4f4d\u4e8e Spring Boot \u7684\u4ee5\u4e0b\u51e0\u4e2a\u6a21\u5757\u4e2d\uff1a<\/p>\n
              \n
            1. \n
              @EnableAutoConfiguration \u7684\u5b9a\u4e49<\/p>\n
              \u2022   \u4f4d\u7f6e: spring-boot-autoconfigure \u6a21\u5757
              \n\u2022   \u7c7b\u8def\u5f84:<\/p>\n<\/li>\n<\/ol>\n
              org.springframework.boot.autoconfigure.EnableAutoConfiguration<\/p>\n
              \u2022   \u6e90\u7801:<\/code><\/pre>\n
              @Target(ElementType.TYPE)\n@Retention(RetentionPolicy.RUNTIME)\n@Documented\n@Inherited\n@AutoConfigurationPackage\n@Import(AutoConfigurationImportSelector.class)\npublic @interface EnableAutoConfiguration {\n    Class<?>[] exclude() default {};\n    String[] excludeName() default {};\n}\n<\/code><\/pre>\n
                \n
              1. \u81ea\u52a8\u914d\u7f6e\u7c7b\u7684\u52a0\u8f7d\u5668<\/li>\n<\/ol>\n
                AutoConfigurationImportSelector<\/p>\n
                \u2022   \u4f4d\u7f6e: spring-boot-autoconfigure \u6a21\u5757\n\u2022   \u7c7b\u8def\u5f84:<\/code><\/pre>\n
                org.springframework.boot.autoconfigure.AutoConfigurationImportSelector<\/p>\n
                \u2022   \u5173\u952e\u6e90\u7801\u7247\u6bb5:<\/code><\/pre>\n
                public class AutoConfigurationImportSelector implements DeferredImportSelector, BeanClassLoaderAware, EnvironmentAware, ResourceLoaderAware {\n    @Override\n    public String[] selectImports(AnnotationMetadata annotationMetadata) {\n        AutoConfigurationEntry autoConfigurationEntry = getAutoConfigurationEntry(annotationMetadata);\n        return StringUtils.toStringArray(autoConfigurationEntry.getConfigurations());\n    }\n\n    protected AutoConfigurationEntry getAutoConfigurationEntry(AnnotationMetadata annotationMetadata) {\n        if (!isEnabled(annotationMetadata)) {\n            return EMPTY_ENTRY;\n        }\n        List<String> configurations = loadAutoConfigurations();\n        configurations = filter(configurations);\n        return new AutoConfigurationEntry(configurations);\n    }\n\n    private List<String> loadAutoConfigurations() {\n        return SpringFactoriesLoader.loadFactoryNames(EnableAutoConfiguration.class, getClass().getClassLoader());\n    }\n}<\/code><\/pre>\n
                  \n
                1. \u52a0\u8f7d spring.factories \u6587\u4ef6<\/li>\n<\/ol>\n
                  SpringFactoriesLoader<\/p>\n
                  \u2022   \u4f4d\u7f6e: spring-core \u6a21\u5757\n\u2022   \u7c7b\u8def\u5f84:<\/code><\/pre>\n
                  org.springframework.core.io.support.SpringFactoriesLoader<\/p>\n
                  \u2022   \u5173\u952e\u6e90\u7801\u7247\u6bb5:<\/code><\/pre>\n
                  public static List<String> loadFactoryNames(Class<?> factoryClass, @Nullable ClassLoader classLoader) {\n    String factoryClassName = factoryClass.getName();\n    return loadSpringFactories(classLoader).getOrDefault(factoryClassName, Collections.emptyList());\n}\n\nprivate static Map<String, List<String>> loadSpringFactories(@Nullable ClassLoader classLoader) {\n    Map<String, List<String>> result = cache.get(classLoader);\n    if (result != null) {\n        return result;\n    }\n\n    try {\n        Enumeration<URL> urls = (classLoader != null ?\n                classLoader.getResources(FACTORIES_RESOURCE_LOCATION) :\n                ClassLoader.getSystemResources(FACTORIES_RESOURCE_LOCATION));\n        \/\/ Load and parse META-INF\/spring.factories\n    }\n}<\/code><\/pre>\n
                  \u2022   spring.factories \u6587\u4ef6\u8def\u5f84:<\/code><\/pre>\n
                  META-INF\/spring.factories<\/code><\/pre>\n
                  \u8be5\u6587\u4ef6\u4e2d\u5b9a\u4e49\u4e86\u6240\u6709\u81ea\u52a8\u914d\u7f6e\u7c7b\uff1a<\/p>\n
                  org.springframework.boot.autoconfigure.EnableAutoConfiguration=\\\norg.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration,\\\norg.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration<\/code><\/pre>\n
                    \n
                  1. \u81ea\u52a8\u914d\u7f6e\u7c7b\u7684\u793a\u4f8b<\/li>\n<\/ol>\n
                    Spring Boot \u63d0\u4f9b\u4e86\u5927\u91cf\u7684\u81ea\u52a8\u914d\u7f6e\u7c7b\uff0c\u4f8b\u5982\uff1a<\/p>\n
                    \u2022   Web \u81ea\u52a8\u914d\u7f6e:<\/code><\/pre>\n
                    org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration\n<\/code><\/pre>\n
                    \u2022   JPA \u81ea\u52a8\u914d\u7f6e:<\/code><\/pre>\n
                    org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration<\/code><\/pre>\n
                    \u8fd9\u4e9b\u7c7b\u4e5f\u5728 spring-boot-autoconfigure \u6a21\u5757\u4e2d\uff0c\u8def\u5f84\u901a\u5e38\u4e3a\uff1a<\/p>\n
                    org.springframework.boot.autoconfigure.[module].[ClassName]<\/code><\/pre>\n
                    \u5982\u4f55\u67e5\u770b\u6e90\u7801<\/p>\n
                    1.  \u901a\u8fc7 IDE \u67e5\u770b\u6e90\u7801:\n\u2022   \u5bfc\u5165 Spring Boot \u7684\u4f9d\u8d56\u3002\n\u2022   \u6309\u4f4f Ctrl\uff08\u6216 Cmd\uff09\u70b9\u51fb\u6ce8\u89e3\uff0c\u5982 @EnableAutoConfiguration \u6216 AutoConfigurationImportSelector\u3002\n2.  \u4ece GitHub \u6d4f\u89c8\u6e90\u7801:\n\u2022   Spring Boot GitHub \u4ed3\u5e93:<\/code><\/pre>\n
                    https:\/\/github.com\/spring-projects\/spring-boot<\/a>
                    \n\u2022   \u5173\u952e\u76ee\u5f55\uff1a
                    \n\u2022   spring-boot-project\/spring-boot-autoconfigure
                    \n\u2022   spring-boot-project\/spring-core<\/p>\n
                      \n
                    1. Maven \u672c\u5730\u7f13\u5b58:
                      \n\u5982\u679c\u4f7f\u7528 Maven\/Gradle \u6784\u5efa\u9879\u76ee\uff0c\u53ef\u4ee5\u4ece\u672c\u5730\u4ed3\u5e93\u4e2d\u627e\u5230\u6e90\u7801 jar \u6587\u4ef6\uff1a<\/p>\n
                      ~\/.m2\/repository\/org\/springframework\/boot\/spring-boot-autoconfigure\/<version>\/spring-boot-autoconfigure-<version>-sources.jar<\/code><\/pre>\n<\/li>\n<\/ol>\n
                      \u6e90\u7801\u4e4b\u95f4\u7684\u8c03\u7528\u5173\u7cfb<\/p>\n
                      1.  @EnableAutoConfiguration \u5bfc\u5165 AutoConfigurationImportSelector\u3002\n2.  AutoConfigurationImportSelector \u8c03\u7528 SpringFactoriesLoader \u8bfb\u53d6 spring.factories \u6587\u4ef6\u3002\n3.  spring.factories \u6587\u4ef6\u4e2d\u5b9a\u4e49\u7684\u81ea\u52a8\u914d\u7f6e\u7c7b\u6309\u6761\u4ef6\u6ce8\u89e3\u751f\u6548\u3002<\/code><\/pre>\n
                      \u4f60\u53ef\u4ee5\u4ece\u8fd9\u4e9b\u6a21\u5757\u548c\u7c7b\u4e2d\u5b8c\u6574\u4e86\u89e3 @EnableAutoConfiguration \u7684\u5b9e\u73b0\u7ec6\u8282\u3002<\/p>\n
                      8. \u5c0f\u7ed3<\/h2>\n
                      \u2022   @EnableAutoConfiguration \u662f Spring Boot \u81ea\u52a8\u914d\u7f6e\u7684\u6838\u5fc3\uff0c\u7ed3\u5408 spring.factories \u548c\u6761\u4ef6\u6ce8\u89e3\u5b9e\u73b0\u81ea\u52a8\u5316\u914d\u7f6e\u3002\n\u2022   \u901a\u8fc7 @Conditional \u7cfb\u5217\u6ce8\u89e3\uff0c\u81ea\u52a8\u914d\u7f6e\u7c7b\u6839\u636e\u8fd0\u884c\u65f6\u73af\u5883\u52a8\u6001\u751f\u6548\u3002\n\u2022   \u5f00\u53d1\u8005\u53ef\u4ee5\u901a\u8fc7 exclude \u6216\u81ea\u5b9a\u4e49\u914d\u7f6e\u6587\u4ef6\uff0c\u8c03\u6574\u6216\u7981\u7528\u67d0\u4e9b\u81ea\u52a8\u914d\u7f6e\u3002<\/code><\/pre>\n
                      \u901a\u8fc7\u8fd9\u79cd\u673a\u5236\uff0cSpring Boot \u63d0\u4f9b\u4e86\u9ad8\u5ea6\u7075\u6d3b\u7684\u81ea\u52a8\u5316\u80fd\u529b\uff0c\u8ba9\u5f00\u53d1\u8005\u4e13\u6ce8\u4e8e\u4e1a\u52a1\u903b\u8f91\u5f00\u53d1\u800c\u4e0d\u5fc5\u5173\u5fc3\u7e41\u6742\u7684\u57fa\u7840\u914d\u7f6e\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
                      \u5728 Spring Boot \u4e2d\uff0c@EnableAutoConfiguration \u662f\u4e00\u4e2a\u6838\u5fc3\u6ce8\u89e3\uff0c\u5b83\u5b9e\u73b0\u4e86\u81ea\u52a8\u914d\u7f6e\u7684\u529f\u80fd\u3002\u5b83\u7684\u4f5c\u7528\u662f\u6839\u636e\u9879\u76ee\u4e2d\u4f9d\u8d56\u7684\u5e93\u4ee5\u53ca\u5e94\u7528\u4e0a\u4e0b\u6587\u4e2d\u7684\u914d\u7f6e\uff0c\u81ea\u52a8\u914d\u7f6e Spring \u5e94\u7528\u7a0b\u5e8f\u7684\u4e0a\u4e0b\u6587\u3002\u4ee5\u4e0b\u662f\u5b83\u7684\u539f\u7406\u548c\u8fd0\u884c\u673a\u5236\uff1a 1. @EnableAutoConfiguration \u7684\u5b9a\u4e49 @EnableAutoConfiguration \u6ce8\u89e3\u672c\u8d28\u4e0a\u662f\u4e00\u4e2a\u590d\u5408\u6ce8\u89e3\uff0c\u5176\u6e90\u7801\u5982\u4e0b\uff1a @Target(ElementType.TYPE) @Retention(RetentionPolicy.RUNTIME) @Documented @Inherited @AutoConfigurationPackage @Import(AutoConfigurationImportSelector.class) public @interface EnableAutoConfiguration { Class<?>[] exclude() default {}; String[] excludeName() default {}; } \u4e3b\u8981\u5305\u62ec\u4ee5\u4e0b\u4e24\u90e8\u5206\uff1a \u2022 @AutoConfigurationPackage: \u81ea\u52a8\u5c06\u5f53\u524d\u7c7b\u6240\u5728\u5305\u53ca\u5176\u5b50\u5305\u4e2d\u7684\u6240\u6709\u7ec4\u4ef6\u6ce8\u518c\u5230 Spring \u5bb9\u5668\u3002 \u2022 @Import(AutoConfigurationImportSelector.class): \u5bfc\u5165\u4e86 AutoConfigurationImportSelector\uff0c\u7528\u6765\u52a0\u8f7d\u6240\u6709\u53ef\u7528\u7684\u81ea\u52a8\u914d\u7f6e\u7c7b\u3002 2. \u81ea\u52a8\u914d\u7f6e\u7684\u6838\u5fc3\u673a\u5236 2.1 \u81ea\u52a8\u914d\u7f6e\u7c7b\u7684\u5b9a\u4e49 \u81ea\u52a8\u914d\u7f6e\u7c7b\u901a\u8fc7 spring.factories \u6587\u4ef6\u5b9a\u4e49\uff0c\u8fd9\u4e2a\u6587\u4ef6\u901a\u5e38\u4f4d\u4e8e META-INF \u76ee\u5f55\u4e0b\u3002\u4f8b\u5982\uff1a org.springframework.boot.autoconfigure.EnableAutoConfiguration=\\ org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration,\\ org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration \u2022 \u6bcf\u4e2a\u7c7b\u90fd\u662f\u4e00\u4e2a\u81ea\u52a8\u914d\u7f6e\u7c7b\uff0cSpring […] →Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-1629","post","type-post","status-publish","format-standard","hentry","category-5"],"_links":{"self":[{"href":"https:\/\/www.fanyamin.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/1629"}],"collection":[{"href":"https:\/\/www.fanyamin.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fanyamin.com\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fanyamin.com\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fanyamin.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1629"}],"version-history":[{"count":4,"href":"https:\/\/www.fanyamin.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/1629\/revisions"}],"predecessor-version":[{"id":1633,"href":"https:\/\/www.fanyamin.com\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/1629\/revisions\/1633"}],"wp:attachment":[{"href":"https:\/\/www.fanyamin.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1629"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fanyamin.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1629"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fanyamin.com\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1629"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}