Spring 源码解析

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Spring 源码解析十四：SpringBoot Autoconfigure 初始化应用时加载的组件

x33g5p2x  于2022-02-11 发布在 Spring  
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这些组件定义在 spring.factories中

  1. # 初始化器
  2. org.springframework.context.ApplicationContextInitializer=\
  3. org.springframework.boot.autoconfigure.SharedMetadataReaderFactoryContextInitializer,\
  4. org.springframework.boot.autoconfigure.logging.ConditionEvaluationReportLoggingListener
  6. # 应用事件监听器
  7. org.springframework.context.ApplicationListener=\
  8. org.springframework.boot.autoconfigure.BackgroundPreinitializer
  10. # 自动配置导入监听器
  11. org.springframework.boot.autoconfigure.AutoConfigurationImportListener=\
  12. org.springframework.boot.autoconfigure.condition.ConditionEvaluationReportAutoConfigurationImportListener
  14. # 自动配置导入过滤器
  15. org.springframework.boot.autoconfigure.AutoConfigurationImportFilter=\
  16. org.springframework.boot.autoconfigure.condition.OnBeanCondition,\
  17. org.springframework.boot.autoconfigure.condition.OnClassCondition,\
  18. org.springframework.boot.autoconfigure.condition.OnWebApplicationCondition
  20. # 自动配置
  21. org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
  22. org.springframework.boot.autoconfigure.admin.SpringApplicationAdminJmxAutoConfiguration,\
  23. org.springframework.boot.autoconfigure.aop.AopAutoConfiguration,\
  24. org.springframework.boot.autoconfigure.amqp.RabbitAutoConfiguration,\
  25. org.springframework.boot.autoconfigure.batch.BatchAutoConfiguration,\
  26. org.springframework.boot.autoconfigure.cache.CacheAutoConfiguration,\
  27. org.springframework.boot.autoconfigure.cassandra.CassandraAutoConfiguration,\
  28. org.springframework.boot.autoconfigure.context.ConfigurationPropertiesAutoConfiguration,\
  29. org.springframework.boot.autoconfigure.context.LifecycleAutoConfiguration,\
  30. org.springframework.boot.autoconfigure.context.MessageSourceAutoConfiguration,\
  31. org.springframework.boot.autoconfigure.context.PropertyPlaceholderAutoConfiguration,\
  32. org.springframework.boot.autoconfigure.couchbase.CouchbaseAutoConfiguration,\
  33. org.springframework.boot.autoconfigure.dao.PersistenceExceptionTranslationAutoConfiguration,\
  34. org.springframework.boot.autoconfigure.data.cassandra.CassandraDataAutoConfiguration,\
  35. org.springframework.boot.autoconfigure.data.cassandra.CassandraReactiveDataAutoConfiguration,\
  36. org.springframework.boot.autoconfigure.data.cassandra.CassandraReactiveRepositoriesAutoConfiguration,\
  37. org.springframework.boot.autoconfigure.data.cassandra.CassandraRepositoriesAutoConfiguration,\
  38. org.springframework.boot.autoconfigure.data.couchbase.CouchbaseDataAutoConfiguration,\
  39. org.springframework.boot.autoconfigure.data.couchbase.CouchbaseReactiveDataAutoConfiguration,\
  40. org.springframework.boot.autoconfigure.data.couchbase.CouchbaseReactiveRepositoriesAutoConfiguration,\
  41. org.springframework.boot.autoconfigure.data.couchbase.CouchbaseRepositoriesAutoConfiguration,\
  42. org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchDataAutoConfiguration,\
  43. org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchRepositoriesAutoConfiguration,\
  44. org.springframework.boot.autoconfigure.data.elasticsearch.ReactiveElasticsearchRepositoriesAutoConfiguration,\
  45. org.springframework.boot.autoconfigure.data.elasticsearch.ReactiveElasticsearchRestClientAutoConfiguration,\
  46. org.springframework.boot.autoconfigure.data.jdbc.JdbcRepositoriesAutoConfiguration,\
  47. org.springframework.boot.autoconfigure.data.jpa.JpaRepositoriesAutoConfiguration,\
  48. org.springframework.boot.autoconfigure.data.ldap.LdapRepositoriesAutoConfiguration,\
  49. org.springframework.boot.autoconfigure.data.mongo.MongoDataAutoConfiguration,\
  50. org.springframework.boot.autoconfigure.data.mongo.MongoReactiveDataAutoConfiguration,\
  51. org.springframework.boot.autoconfigure.data.mongo.MongoReactiveRepositoriesAutoConfiguration,\
  52. org.springframework.boot.autoconfigure.data.mongo.MongoRepositoriesAutoConfiguration,\
  53. org.springframework.boot.autoconfigure.data.neo4j.Neo4jDataAutoConfiguration,\
  54. org.springframework.boot.autoconfigure.data.neo4j.Neo4jReactiveDataAutoConfiguration,\
  55. org.springframework.boot.autoconfigure.data.neo4j.Neo4jReactiveRepositoriesAutoConfiguration,\
  56. org.springframework.boot.autoconfigure.data.neo4j.Neo4jRepositoriesAutoConfiguration,\
  57. org.springframework.boot.autoconfigure.data.r2dbc.R2dbcDataAutoConfiguration,\
  58. org.springframework.boot.autoconfigure.data.r2dbc.R2dbcRepositoriesAutoConfiguration,\
  59. org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration,\
  60. org.springframework.boot.autoconfigure.data.redis.RedisReactiveAutoConfiguration,\
  61. org.springframework.boot.autoconfigure.data.redis.RedisRepositoriesAutoConfiguration,\
  62. org.springframework.boot.autoconfigure.data.rest.RepositoryRestMvcAutoConfiguration,\
  63. org.springframework.boot.autoconfigure.data.web.SpringDataWebAutoConfiguration,\
  64. org.springframework.boot.autoconfigure.elasticsearch.ElasticsearchRestClientAutoConfiguration,\
  65. org.springframework.boot.autoconfigure.flyway.FlywayAutoConfiguration,\
  66. org.springframework.boot.autoconfigure.freemarker.FreeMarkerAutoConfiguration,\
  67. org.springframework.boot.autoconfigure.groovy.template.GroovyTemplateAutoConfiguration,\
  68. org.springframework.boot.autoconfigure.gson.GsonAutoConfiguration,\
  69. org.springframework.boot.autoconfigure.h2.H2ConsoleAutoConfiguration,\
  70. org.springframework.boot.autoconfigure.hateoas.HypermediaAutoConfiguration,\
  71. org.springframework.boot.autoconfigure.hazelcast.HazelcastAutoConfiguration,\
  72. org.springframework.boot.autoconfigure.hazelcast.HazelcastJpaDependencyAutoConfiguration,\
  73. org.springframework.boot.autoconfigure.http.HttpMessageConvertersAutoConfiguration,\
  74. org.springframework.boot.autoconfigure.http.codec.CodecsAutoConfiguration,\
  75. org.springframework.boot.autoconfigure.influx.InfluxDbAutoConfiguration,\
  76. org.springframework.boot.autoconfigure.info.ProjectInfoAutoConfiguration,\
  77. org.springframework.boot.autoconfigure.integration.IntegrationAutoConfiguration,\
  78. org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration,\
  79. org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration,\
  80. org.springframework.boot.autoconfigure.jdbc.JdbcTemplateAutoConfiguration,\
  81. org.springframework.boot.autoconfigure.jdbc.JndiDataSourceAutoConfiguration,\
  82. org.springframework.boot.autoconfigure.jdbc.XADataSourceAutoConfiguration,\
  83. org.springframework.boot.autoconfigure.jdbc.DataSourceTransactionManagerAutoConfiguration,\
  84. org.springframework.boot.autoconfigure.jms.JmsAutoConfiguration,\
  85. org.springframework.boot.autoconfigure.jmx.JmxAutoConfiguration,\
  86. org.springframework.boot.autoconfigure.jms.JndiConnectionFactoryAutoConfiguration,\
  87. org.springframework.boot.autoconfigure.jms.activemq.ActiveMQAutoConfiguration,\
  88. org.springframework.boot.autoconfigure.jms.artemis.ArtemisAutoConfiguration,\
  89. org.springframework.boot.autoconfigure.jersey.JerseyAutoConfiguration,\
  90. org.springframework.boot.autoconfigure.jooq.JooqAutoConfiguration,\
  91. org.springframework.boot.autoconfigure.jsonb.JsonbAutoConfiguration,\
  92. org.springframework.boot.autoconfigure.kafka.KafkaAutoConfiguration,\
  93. org.springframework.boot.autoconfigure.availability.ApplicationAvailabilityAutoConfiguration,\
  94. org.springframework.boot.autoconfigure.ldap.embedded.EmbeddedLdapAutoConfiguration,\
  95. org.springframework.boot.autoconfigure.ldap.LdapAutoConfiguration,\
  96. org.springframework.boot.autoconfigure.liquibase.LiquibaseAutoConfiguration,\
  97. org.springframework.boot.autoconfigure.mail.MailSenderAutoConfiguration,\
  98. org.springframework.boot.autoconfigure.mail.MailSenderValidatorAutoConfiguration,\
  99. org.springframework.boot.autoconfigure.mongo.embedded.EmbeddedMongoAutoConfiguration,\
  100. org.springframework.boot.autoconfigure.mongo.MongoAutoConfiguration,\
  101. org.springframework.boot.autoconfigure.mongo.MongoReactiveAutoConfiguration,\
  102. org.springframework.boot.autoconfigure.mustache.MustacheAutoConfiguration,\
  103. org.springframework.boot.autoconfigure.neo4j.Neo4jAutoConfiguration,\
  104. org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration,\
  105. org.springframework.boot.autoconfigure.quartz.QuartzAutoConfiguration,\
  106. org.springframework.boot.autoconfigure.r2dbc.R2dbcAutoConfiguration,\
  107. org.springframework.boot.autoconfigure.r2dbc.R2dbcTransactionManagerAutoConfiguration,\
  108. org.springframework.boot.autoconfigure.rsocket.RSocketMessagingAutoConfiguration,\
  109. org.springframework.boot.autoconfigure.rsocket.RSocketRequesterAutoConfiguration,\
  110. org.springframework.boot.autoconfigure.rsocket.RSocketServerAutoConfiguration,\
  111. org.springframework.boot.autoconfigure.rsocket.RSocketStrategiesAutoConfiguration,\
  112. org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration,\
  113. org.springframework.boot.autoconfigure.security.servlet.UserDetailsServiceAutoConfiguration,\
  114. org.springframework.boot.autoconfigure.security.servlet.SecurityFilterAutoConfiguration,\
  115. org.springframework.boot.autoconfigure.security.reactive.ReactiveSecurityAutoConfiguration,\
  116. org.springframework.boot.autoconfigure.security.reactive.ReactiveUserDetailsServiceAutoConfiguration,\
  117. org.springframework.boot.autoconfigure.security.rsocket.RSocketSecurityAutoConfiguration,\
  118. org.springframework.boot.autoconfigure.security.saml2.Saml2RelyingPartyAutoConfiguration,\
  119. org.springframework.boot.autoconfigure.sendgrid.SendGridAutoConfiguration,\
  120. org.springframework.boot.autoconfigure.session.SessionAutoConfiguration,\
  121. org.springframework.boot.autoconfigure.security.oauth2.client.servlet.OAuth2ClientAutoConfiguration,\
  122. org.springframework.boot.autoconfigure.security.oauth2.client.reactive.ReactiveOAuth2ClientAutoConfiguration,\
  123. org.springframework.boot.autoconfigure.security.oauth2.resource.servlet.OAuth2ResourceServerAutoConfiguration,\
  124. org.springframework.boot.autoconfigure.security.oauth2.resource.reactive.ReactiveOAuth2ResourceServerAutoConfiguration,\
  125. org.springframework.boot.autoconfigure.solr.SolrAutoConfiguration,\
  126. org.springframework.boot.autoconfigure.task.TaskExecutionAutoConfiguration,\
  127. org.springframework.boot.autoconfigure.task.TaskSchedulingAutoConfiguration,\
  128. org.springframework.boot.autoconfigure.thymeleaf.ThymeleafAutoConfiguration,\
  129. org.springframework.boot.autoconfigure.transaction.TransactionAutoConfiguration,\
  130. org.springframework.boot.autoconfigure.transaction.jta.JtaAutoConfiguration,\
  131. org.springframework.boot.autoconfigure.validation.ValidationAutoConfiguration,\
  132. org.springframework.boot.autoconfigure.web.client.RestTemplateAutoConfiguration,\
  133. org.springframework.boot.autoconfigure.web.embedded.EmbeddedWebServerFactoryCustomizerAutoConfiguration,\
  134. org.springframework.boot.autoconfigure.web.reactive.HttpHandlerAutoConfiguration,\
  135. org.springframework.boot.autoconfigure.web.reactive.ReactiveWebServerFactoryAutoConfiguration,\
  136. org.springframework.boot.autoconfigure.web.reactive.WebFluxAutoConfiguration,\
  137. org.springframework.boot.autoconfigure.web.reactive.error.ErrorWebFluxAutoConfiguration,\
  138. org.springframework.boot.autoconfigure.web.reactive.function.client.ClientHttpConnectorAutoConfiguration,\
  139. org.springframework.boot.autoconfigure.web.reactive.function.client.WebClientAutoConfiguration,\
  140. org.springframework.boot.autoconfigure.web.servlet.DispatcherServletAutoConfiguration,\
  141. org.springframework.boot.autoconfigure.web.servlet.ServletWebServerFactoryAutoConfiguration,\
  142. org.springframework.boot.autoconfigure.web.servlet.error.ErrorMvcAutoConfiguration,\
  143. org.springframework.boot.autoconfigure.web.servlet.HttpEncodingAutoConfiguration,\
  144. org.springframework.boot.autoconfigure.web.servlet.MultipartAutoConfiguration,\
  145. org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration,\
  146. org.springframework.boot.autoconfigure.websocket.reactive.WebSocketReactiveAutoConfiguration,\
  147. org.springframework.boot.autoconfigure.websocket.servlet.WebSocketServletAutoConfiguration,\
  148. org.springframework.boot.autoconfigure.websocket.servlet.WebSocketMessagingAutoConfiguration,\
  149. org.springframework.boot.autoconfigure.webservices.WebServicesAutoConfiguration,\
  150. org.springframework.boot.autoconfigure.webservices.client.WebServiceTemplateAutoConfiguration
  152. # 失败分析器
  153. org.springframework.boot.diagnostics.FailureAnalyzer=\
  154. org.springframework.boot.autoconfigure.data.redis.RedisUrlSyntaxFailureAnalyzer,\
  155. org.springframework.boot.autoconfigure.diagnostics.analyzer.NoSuchBeanDefinitionFailureAnalyzer,\
  156. org.springframework.boot.autoconfigure.flyway.FlywayMigrationScriptMissingFailureAnalyzer,\
  157. org.springframework.boot.autoconfigure.jdbc.DataSourceBeanCreationFailureAnalyzer,\
  158. org.springframework.boot.autoconfigure.jdbc.HikariDriverConfigurationFailureAnalyzer,\
  159. org.springframework.boot.autoconfigure.r2dbc.ConnectionFactoryBeanCreationFailureAnalyzer,\
  160. org.springframework.boot.autoconfigure.session.NonUniqueSessionRepositoryFailureAnalyzer
  162. # 检查模板可用提供器
  163. org.springframework.boot.autoconfigure.template.TemplateAvailabilityProvider=\
  164. org.springframework.boot.autoconfigure.freemarker.FreeMarkerTemplateAvailabilityProvider,\
  165. org.springframework.boot.autoconfigure.mustache.MustacheTemplateAvailabilityProvider,\
  166. org.springframework.boot.autoconfigure.groovy.template.GroovyTemplateAvailabilityProvider,\
  167. org.springframework.boot.autoconfigure.thymeleaf.ThymeleafTemplateAvailabilityProvider,\
  168. org.springframework.boot.autoconfigure.web.servlet.JspTemplateAvailabilityProvider

1. 初始化器

  1. org.springframework.context.ApplicationContextInitializer=\
  2. org.springframework.boot.autoconfigure.SharedMetadataReaderFactoryContextInitializer,\
  3. org.springframework.boot.autoconfigure.logging.ConditionEvaluationReportLoggingListener

1.1. SharedMetadataReaderFactoryContextInitializer

SharedMetadataReaderFactoryContextInitializer
的主要功能是提供一个共享的缓存元信息读取工厂

  1. class SharedMetadataReaderFactoryContextInitializer
  2.         implements ApplicationContextInitializer<ConfigurableApplicationContext>, Ordered {
  3.     // 初始化
  4.     @Override
  5.     public void initialize(ConfigurableApplicationContext applicationContext) {
  6.         BeanFactoryPostProcessor postProcessor = new CachingMetadataReaderFactoryPostProcessor(applicationContext);
  7.         applicationContext.addBeanFactoryPostProcessor(postProcessor);
  8.     }
  10.     static class CachingMetadataReaderFactoryPostProcessor
  11.             implements BeanDefinitionRegistryPostProcessor, PriorityOrdered {
  12.         // 注册bean定义
  13.         @Override
  14.         public void postProcessBeanDefinitionRegistry(BeanDefinitionRegistry registry) throws BeansException {
  15.             // 注册bean定义注册器
  16.             register(registry);
  17.             // 配置 @Configuration bean
  18.             configureConfigurationClassPostProcessor(registry);
  19.         }
  21.         // 注册bean定义注册器
  22.         private void register(BeanDefinitionRegistry registry) {
  23.             BeanDefinition definition = BeanDefinitionBuilder
  24.                     .genericBeanDefinition(SharedMetadataReaderFactoryBean.class, SharedMetadataReaderFactoryBean::new)
  25.                     .getBeanDefinition();
  26.             // 注册为 "org.springframework.boot.autoconfigure.internalCachingMetadataReaderFactory" 名字
  27.             registry.registerBeanDefinition(BEAN_NAME, definition);
  28.         }
  30.         // 配置 @Configuration bean
  31.         private void configureConfigurationClassPostProcessor(BeanDefinitionRegistry registry) {
  32.             try {
  33.                 // 配置bean "org.springframework.context.annotation.internalConfigurationAnnotationProcessor"
  34.                 configureConfigurationClassPostProcessor(
  35.                         registry.getBeanDefinition(AnnotationConfigUtils.CONFIGURATION_ANNOTATION_PROCESSOR_BEAN_NAME));
  36.             }
  37.             catch (NoSuchBeanDefinitionException ex) {
  38.             }
  39.         }
  40.     }
  41. }

1.2. ConditionEvaluationReportLoggingListener

ConditionEvaluationReportLoggingListener
的主要功能是输出日志到文件

2. 应用事件监听器

  1. org.springframework.context.ApplicationListener=\
  2. org.springframework.boot.autoconfigure.BackgroundPreinitializer

BackgroundPreinitializer
的主要功能是初始化数据转换与编码等服务

  1. public class BackgroundPreinitializer implements ApplicationListener<SpringApplicationEvent> {
  2.     @Override
  3.     public void onApplicationEvent(SpringApplicationEvent event) {
  4.         // ... 代码省略
  6.         if (event instanceof ApplicationEnvironmentPreparedEvent
  7.                 && preinitializationStarted.compareAndSet(false, true)) {
  8.             performPreinitialization();
  9.         }
  10.         if ((event instanceof ApplicationReadyEvent || event instanceof ApplicationFailedEvent)
  11.                 && preinitializationStarted.get()) {
  12.             try {
  13.                 preinitializationComplete.await();
  14.             }
  15.             catch (InterruptedException ex) {
  16.                 Thread.currentThread().interrupt();
  17.             }
  18.         }
  19.     }
  21.     // 初始化其他组件
  22.     private void performPreinitialization() {
  23.         try {
  24.             Thread thread = new Thread(new Runnable() {
  26.                 @Override
  27.                 public void run() {
  28.                     // 初始化数据转换服务，DefaultFormattingConversionService
  29.                     runSafely(new ConversionServiceInitializer());
  30.                     // 初始化数据验证服务，Validation.byDefaultProvider()
  31.                     runSafely(new ValidationInitializer());
  32.                     // 初始化消息转换服务，AllEncompassingFormHttpMessageConverter
  33.                     runSafely(new MessageConverterInitializer());
  34.                     // 初始化JSON服务，Jackson2ObjectMapperBuilder
  35.                     runSafely(new JacksonInitializer());
  36.                     // 初始化字符编码服务，StandardCharsets
  37.                     runSafely(new CharsetInitializer());
  38.                     preinitializationComplete.countDown();
  39.                 }
  41.                 public void runSafely(Runnable runnable) {
  42.                     try {
  43.                         runnable.run();
  44.                     }
  45.                     catch (Throwable ex) {}
  46.                 }
  48.             }, "background-preinit");
  49.             thread.start();
  50.         }
  51.         catch (Exception ex) {
  52.             // ... 代码省略
  53.         }
  54.     }
  56.     private static class MessageConverterInitializer implements Runnable {
  57.         @Override
  58.         public void run() {
  59.             new AllEncompassingFormHttpMessageConverter();
  60.         }
  61.     }
  63.     private static class ValidationInitializer implements Runnable {
  64.         @Override
  65.         public void run() {
  66.             Configuration<?> configuration = Validation.byDefaultProvider().configure();
  67.             configuration.buildValidatorFactory().getValidator();
  68.         }
  69.     }
  71.     private static class JacksonInitializer implements Runnable {
  72.         @Override
  73.         public void run() {
  74.             Jackson2ObjectMapperBuilder.json().build();
  75.         }
  76.     }
  78.     private static class ConversionServiceInitializer implements Runnable {
  79.         @Override
  80.         public void run() {
  81.             new DefaultFormattingConversionService();
  82.         }
  83.     }
  85.     private static class CharsetInitializer implements Runnable {
  86.         @Override
  87.         public void run() {
  88.             StandardCharsets.UTF_8.name();
  89.         }
  90.     }
  91. }

3. 自动配置导入监听器

  1. org.springframework.boot.autoconfigure.AutoConfigurationImportListener=\
  2. org.springframework.boot.autoconfigure.condition.ConditionEvaluationReportAutoConfigurationImportListener

ConditionEvaluationReportAutoConfigurationImportListener
的主要功能是从 Report 中读取结果

4. 自动配置导入过滤器

  1. org.springframework.boot.autoconfigure.AutoConfigurationImportFilter=\
  2. org.springframework.boot.autoconfigure.condition.OnBeanCondition,\
  3. org.springframework.boot.autoconfigure.condition.OnClassCondition,\
  4. org.springframework.boot.autoconfigure.condition.OnWebApplicationCondition

4.1. OnBeanCondition

OnBeanCondition
的主要功能是处理注解 @ConditionalOnBean、@ConditionalOnMissingBean、@ConditionalOnSingleCandidate，按条件动态载入 bean

  • @ConditionOnBean 判断条件 bean 存在，注入当下注解的 bean
  • @ConditionOnMissingBean 判断条件 bean 不存在，才注入当下注解的 bean
  • @ConditionalOnSingleCandidate 判断条件 bean 只能有一个实例或多个但只有一个 primary 实例，才注入当下注解的 bean

先来看看继承关系

  1. - SpringBootCondition
  2.   - FilteringSpringBootCondition
  3.     - OnBeanCondition

4.1.1. SpringBootCondition

SpringBootCondition
是用条件来检查组件的基础类

  1. public abstract class SpringBootCondition implements Condition {
  2.     // 元信息代表的组件是否匹配
  3.     @Override
  4.     public final boolean matches(ConditionContext context, AnnotatedTypeMetadata metadata) {
  5.         // 获取类名或方法名
  6.         String classOrMethodName = getClassOrMethodName(metadata);
  7.         try {
  8.             // 获取匹配结果
  9.             ConditionOutcome outcome = getMatchOutcome(context, metadata);
  11.             // ... 代码省略
  13.             // 返回是否匹配
  14.             return outcome.isMatch();
  15.         }
  16.         catch (NoClassDefFoundError ex) {
  17.             // ... 代码省略
  18.         }
  20.         // ... 代码省略
  21.     }
  23.     // 获取匹配结果，由子类实现
  24.     public abstract ConditionOutcome getMatchOutcome(ConditionContext context, AnnotatedTypeMetadata metadata);
  25. }

4.1.2. FilteringSpringBootCondition

FilteringSpringBootCondition
的主要功能是添加过滤功能

  1. abstract class FilteringSpringBootCondition extends SpringBootCondition
  2.         implements AutoConfigurationImportFilter, BeanFactoryAware, BeanClassLoaderAware {
  3.     // 元信息代表的组件是否匹配
  4.     @Override
  5.     public boolean[] match(String[] autoConfigurationClasses, AutoConfigurationMetadata autoConfigurationMetadata) {
  6.         // 获取结果
  7.         ConditionOutcome[] outcomes = getOutcomes(autoConfigurationClasses, autoConfigurationMetadata);
  8.         boolean[] match = new boolean[outcomes.length];
  9.         for (int i = 0; i < outcomes.length; i++) {
  10.             // 如果返回为null或true，则表示匹配
  11.             match[i] = (outcomes[i] == null || outcomes[i].isMatch());
  12.             // ... 代码省略
  13.         }
  14.         return match;
  15.     }
  17.     // 获取结果，由子类实现
  18.     protected abstract ConditionOutcome[] getOutcomes(String[] autoConfigurationClasses,
  19.             AutoConfigurationMetadata autoConfigurationMetadata);
  20. }

4.1.3. SpringBootCondition

SpringBootCondition
的主要功能是处理注解 @ConditionalOnBean、@ConditionalOnMissingBean、@ConditionalOnSingleCandidate，按条件动态载入 bean

  1. class OnBeanCondition extends FilteringSpringBootCondition implements ConfigurationCondition {
  2.     // 获取结果
  3.     @Override
  4.     protected final ConditionOutcome[] getOutcomes(String[] autoConfigurationClasses,
  5.             AutoConfigurationMetadata autoConfigurationMetadata) {
  6.         // 结果集
  7.         ConditionOutcome[] outcomes = new ConditionOutcome[autoConfigurationClasses.length];
  8.         for (int i = 0; i < outcomes.length; i++) {
  9.             // 自动配置类
  10.             String autoConfigurationClass = autoConfigurationClasses[i];
  11.             if (autoConfigurationClass != null) {
  12.                 // 获取ConditionalOnBean的bean类型
  13.                 Set<String> onBeanTypes = autoConfigurationMetadata.getSet(autoConfigurationClass, "ConditionalOnBean");
  14.                 // 确定有没有ConditionalOnBean的bean类型
  15.                 outcomes[i] = getOutcome(onBeanTypes, ConditionalOnBean.class);
  16.                 if (outcomes[i] == null) {
  17.                     // 获取ConditionalOnSingleCandidate的bean类型
  18.                     Set<String> onSingleCandidateTypes = autoConfigurationMetadata.getSet(autoConfigurationClass,
  19.                             "ConditionalOnSingleCandidate");
  20.                     // 确定有没有ConditionalOnSingleCandidate的bean类型
  21.                     outcomes[i] = getOutcome(onSingleCandidateTypes, ConditionalOnSingleCandidate.class);
  22.                 }
  23.             }
  24.         }
  25.         return outcomes;
  26.     }
  27. }
  1. class OnBeanCondition extends FilteringSpringBootCondition implements ConfigurationCondition {
  2.     // 获取匹配结果
  3.     @Override
  4.     public ConditionOutcome getMatchOutcome(ConditionContext context, AnnotatedTypeMetadata metadata) {
  5.         // 匹配信息
  6.         ConditionMessage matchMessage = ConditionMessage.empty();
  7.         // 元信息中的注解
  8.         MergedAnnotations annotations = metadata.getAnnotations();
  9.         // 有@ConditionalOnBean注解
  10.         if (annotations.isPresent(ConditionalOnBean.class)) {
  11.             // 创建ConditionalOnBean的匹配标准对象
  12.             Spec<ConditionalOnBean> spec = new Spec<>(context, metadata, annotations, ConditionalOnBean.class);
  13.             // 获取匹配的bean
  14.             MatchResult matchResult = getMatchingBeans(context, spec);
  15.             // 如果一个都没有匹配到
  16.             if (!matchResult.isAllMatched()) {
  17.                 // 返回匹配不到的信息
  18.                 String reason = createOnBeanNoMatchReason(matchResult);
  19.                 return ConditionOutcome.noMatch(spec.message().because(reason));
  20.             }
  21.             // 匹配到了，继续
  22.             matchMessage = spec.message(matchMessage).found("bean", "beans").items(Style.QUOTE,
  23.                     matchResult.getNamesOfAllMatches());
  24.         }
  25.         // 有@ConditionalOnSingleCandidate注解
  26.         if (metadata.isAnnotated(ConditionalOnSingleCandidate.class.getName())) {
  27.             // 创建ConditionalOnSingleCandidate的匹配标准对象
  28.             Spec<ConditionalOnSingleCandidate> spec = new SingleCandidateSpec(context, metadata, annotations);
  29.             // 获取匹配的bean
  30.             MatchResult matchResult = getMatchingBeans(context, spec);
  31.             // 如果一个都没有匹配到
  32.             if (!matchResult.isAllMatched()) {
  33.                 // 返回匹配不到的信息
  34.                 return ConditionOutcome.noMatch(spec.message().didNotFind("any beans").atAll());
  35.             }
  36.             // 匹配到多个bean，但没有primary bean
  37.             else if (!hasSingleAutowireCandidate(context.getBeanFactory(), matchResult.getNamesOfAllMatches(),
  38.                     spec.getStrategy() == SearchStrategy.ALL)) {
  39.                 // 返回匹配到多个的信息
  40.                 return ConditionOutcome.noMatch(spec.message().didNotFind("a primary bean from beans")
  41.                         .items(Style.QUOTE, matchResult.getNamesOfAllMatches()));
  42.             }
  43.             // 匹配到了，继续
  44.             matchMessage = spec.message(matchMessage).found("a primary bean from beans").items(Style.QUOTE,
  45.                     matchResult.getNamesOfAllMatches());
  46.         }
  47.         // 有@ConditionalOnMissingBean注解
  48.         if (metadata.isAnnotated(ConditionalOnMissingBean.class.getName())) {
  49.             // 创建ConditionalOnMissingBean的匹配标准对象
  50.             Spec<ConditionalOnMissingBean> spec = new Spec<>(context, metadata, annotations,
  51.                     ConditionalOnMissingBean.class);
  52.             // 获取匹配的bean
  53.             MatchResult matchResult = getMatchingBeans(context, spec);
  54.             // 如果匹配到了
  55.             if (matchResult.isAnyMatched()) {
  56.                 // 返回匹配到了的信息
  57.                 String reason = createOnMissingBeanNoMatchReason(matchResult);
  58.                 return ConditionOutcome.noMatch(spec.message().because(reason));
  59.             }
  60.             // 匹配不到，继续
  61.             matchMessage = spec.message(matchMessage).didNotFind("any beans").atAll();
  62.         }
  63.         return ConditionOutcome.match(matchMessage);
  64.     }
  65. }

4.2. OnClassCondition

OnClassCondition
的主要功能是处理注解 @ConditionalOnClass、@ConditionalOnMissingClass，按条件动态载入 bean

  • @ConditionalOnClass 判断条件类存在，注入当下注解的 bean
  • @ConditionalOnMissingClass 判断条件类不存在，才注入当下注解的 bean
  1. class OnClassCondition extends FilteringSpringBootCondition {
  2.     // 获取结果
  3.     @Override
  4.     protected final ConditionOutcome[] getOutcomes(String[] autoConfigurationClasses,
  5.             AutoConfigurationMetadata autoConfigurationMetadata) {
  6.         // ... 代码省略
  8.         OutcomesResolver outcomesResolver = new StandardOutcomesResolver(autoConfigurationClasses, 0,
  9.                 autoConfigurationClasses.length, autoConfigurationMetadata, getBeanClassLoader());
  10.         // 获取ConditionalOnClass的输出
  11.         return outcomesResolver.resolveOutcomes();
  13.     }
  15.     // 获取匹配结果
  16.     @Override
  17.     public ConditionOutcome getMatchOutcome(ConditionContext context, AnnotatedTypeMetadata metadata) {
  18.         ClassLoader classLoader = context.getClassLoader();
  19.         // 匹配信息
  20.         ConditionMessage matchMessage = ConditionMessage.empty();
  21.         // 获取标记有@ConditionalOnClass注解的类
  22.         List<String> onClasses = getCandidates(metadata, ConditionalOnClass.class);
  23.         if (onClasses != null) {
  24.             List<String> missing = filter(onClasses, ClassNameFilter.MISSING, classLoader);
  25.             // 类不存在，返回
  26.             if (!missing.isEmpty()) {
  27.                 return ConditionOutcome.noMatch(ConditionMessage.forCondition(ConditionalOnClass.class)
  28.                         .didNotFind("required class", "required classes").items(Style.QUOTE, missing));
  29.             }
  30.             // 类存在，继续
  31.             matchMessage = matchMessage.andCondition(ConditionalOnClass.class)
  32.                     .found("required class", "required classes")
  33.                     .items(Style.QUOTE, filter(onClasses, ClassNameFilter.PRESENT, classLoader));
  34.         }
  35.         // 获取标记有@ConditionalOnMissingClass注解的类
  36.         List<String> onMissingClasses = getCandidates(metadata, ConditionalOnMissingClass.class);
  37.         if (onMissingClasses != null) {
  38.             List<String> present = filter(onMissingClasses, ClassNameFilter.PRESENT, classLoader);
  39.             // 类存在，返回
  40.             if (!present.isEmpty()) {
  41.                 return ConditionOutcome.noMatch(ConditionMessage.forCondition(ConditionalOnMissingClass.class)
  42.                         .found("unwanted class", "unwanted classes").items(Style.QUOTE, present));
  43.             }
  44.             // 类不存在，继续
  45.             matchMessage = matchMessage.andCondition(ConditionalOnMissingClass.class)
  46.                     .didNotFind("unwanted class", "unwanted classes")
  47.                     .items(Style.QUOTE, filter(onMissingClasses, ClassNameFilter.MISSING, classLoader));
  48.         }
  49.         return ConditionOutcome.match(matchMessage);
  50.     }
  52. }

4.3. OnWebApplicationCondition

OnWebApplicationCondition
的主要功能是处理注解 @ConditionalOnWebApplication、@ConditionalOnNotWebApplication，按条件动态载入 bean

  • @ConditionalOnWebApplication 判断应用时 Web 应用时，注入当下注解的 bean
  • @ConditionalOnNotWebApplication 判断应用时不是 Web 应用时，才注入当下注解的 bean

5. 自动配置

  1. org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
  2. org.springframework.boot.autoconfigure.admin.SpringApplicationAdminJmxAutoConfiguration,\
  3. org.springframework.boot.autoconfigure.aop.AopAutoConfiguration,\
  4. org.springframework.boot.autoconfigure.amqp.RabbitAutoConfiguration,\
  5. org.springframework.boot.autoconfigure.batch.BatchAutoConfiguration,\
  6. org.springframework.boot.autoconfigure.cache.CacheAutoConfiguration,\
  7. org.springframework.boot.autoconfigure.cassandra.CassandraAutoConfiguration,\
  8. org.springframework.boot.autoconfigure.context.ConfigurationPropertiesAutoConfiguration,\
  9. org.springframework.boot.autoconfigure.context.LifecycleAutoConfiguration,\
  10. org.springframework.boot.autoconfigure.context.MessageSourceAutoConfiguration,\
  11. org.springframework.boot.autoconfigure.context.PropertyPlaceholderAutoConfiguration,\
  12. org.springframework.boot.autoconfigure.couchbase.CouchbaseAutoConfiguration,\
  13. org.springframework.boot.autoconfigure.dao.PersistenceExceptionTranslationAutoConfiguration,\
  14. org.springframework.boot.autoconfigure.data.cassandra.CassandraDataAutoConfiguration,\
  15. org.springframework.boot.autoconfigure.data.cassandra.CassandraReactiveDataAutoConfiguration,\
  16. org.springframework.boot.autoconfigure.data.cassandra.CassandraReactiveRepositoriesAutoConfiguration,\
  17. org.springframework.boot.autoconfigure.data.cassandra.CassandraRepositoriesAutoConfiguration,\
  18. org.springframework.boot.autoconfigure.data.couchbase.CouchbaseDataAutoConfiguration,\
  19. org.springframework.boot.autoconfigure.data.couchbase.CouchbaseReactiveDataAutoConfiguration,\
  20. org.springframework.boot.autoconfigure.data.couchbase.CouchbaseReactiveRepositoriesAutoConfiguration,\
  21. org.springframework.boot.autoconfigure.data.couchbase.CouchbaseRepositoriesAutoConfiguration,\
  22. org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchDataAutoConfiguration,\
  23. org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchRepositoriesAutoConfiguration,\
  24. org.springframework.boot.autoconfigure.data.elasticsearch.ReactiveElasticsearchRepositoriesAutoConfiguration,\
  25. org.springframework.boot.autoconfigure.data.elasticsearch.ReactiveElasticsearchRestClientAutoConfiguration,\
  26. org.springframework.boot.autoconfigure.data.jdbc.JdbcRepositoriesAutoConfiguration,\
  27. org.springframework.boot.autoconfigure.data.jpa.JpaRepositoriesAutoConfiguration,\
  28. org.springframework.boot.autoconfigure.data.ldap.LdapRepositoriesAutoConfiguration,\
  29. org.springframework.boot.autoconfigure.data.mongo.MongoDataAutoConfiguration,\
  30. org.springframework.boot.autoconfigure.data.mongo.MongoReactiveDataAutoConfiguration,\
  31. org.springframework.boot.autoconfigure.data.mongo.MongoReactiveRepositoriesAutoConfiguration,\
  32. org.springframework.boot.autoconfigure.data.mongo.MongoRepositoriesAutoConfiguration,\
  33. org.springframework.boot.autoconfigure.data.neo4j.Neo4jDataAutoConfiguration,\
  34. org.springframework.boot.autoconfigure.data.neo4j.Neo4jReactiveDataAutoConfiguration,\
  35. org.springframework.boot.autoconfigure.data.neo4j.Neo4jReactiveRepositoriesAutoConfiguration,\
  36. org.springframework.boot.autoconfigure.data.neo4j.Neo4jRepositoriesAutoConfiguration,\
  37. org.springframework.boot.autoconfigure.data.r2dbc.R2dbcDataAutoConfiguration,\
  38. org.springframework.boot.autoconfigure.data.r2dbc.R2dbcRepositoriesAutoConfiguration,\
  39. org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration,\
  40. org.springframework.boot.autoconfigure.data.redis.RedisReactiveAutoConfiguration,\
  41. org.springframework.boot.autoconfigure.data.redis.RedisRepositoriesAutoConfiguration,\
  42. org.springframework.boot.autoconfigure.data.rest.RepositoryRestMvcAutoConfiguration,\
  43. org.springframework.boot.autoconfigure.data.web.SpringDataWebAutoConfiguration,\
  44. org.springframework.boot.autoconfigure.elasticsearch.ElasticsearchRestClientAutoConfiguration,\
  45. org.springframework.boot.autoconfigure.flyway.FlywayAutoConfiguration,\
  46. org.springframework.boot.autoconfigure.freemarker.FreeMarkerAutoConfiguration,\
  47. org.springframework.boot.autoconfigure.groovy.template.GroovyTemplateAutoConfiguration,\
  48. org.springframework.boot.autoconfigure.gson.GsonAutoConfiguration,\
  49. org.springframework.boot.autoconfigure.h2.H2ConsoleAutoConfiguration,\
  50. org.springframework.boot.autoconfigure.hateoas.HypermediaAutoConfiguration,\
  51. org.springframework.boot.autoconfigure.hazelcast.HazelcastAutoConfiguration,\
  52. org.springframework.boot.autoconfigure.hazelcast.HazelcastJpaDependencyAutoConfiguration,\
  53. org.springframework.boot.autoconfigure.http.HttpMessageConvertersAutoConfiguration,\
  54. org.springframework.boot.autoconfigure.http.codec.CodecsAutoConfiguration,\
  55. org.springframework.boot.autoconfigure.influx.InfluxDbAutoConfiguration,\
  56. org.springframework.boot.autoconfigure.info.ProjectInfoAutoConfiguration,\
  57. org.springframework.boot.autoconfigure.integration.IntegrationAutoConfiguration,\
  58. org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration,\
  59. org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration,\
  60. org.springframework.boot.autoconfigure.jdbc.JdbcTemplateAutoConfiguration,\
  61. org.springframework.boot.autoconfigure.jdbc.JndiDataSourceAutoConfiguration,\
  62. org.springframework.boot.autoconfigure.jdbc.XADataSourceAutoConfiguration,\
  63. org.springframework.boot.autoconfigure.jdbc.DataSourceTransactionManagerAutoConfiguration,\
  64. org.springframework.boot.autoconfigure.jms.JmsAutoConfiguration,\
  65. org.springframework.boot.autoconfigure.jmx.JmxAutoConfiguration,\
  66. org.springframework.boot.autoconfigure.jms.JndiConnectionFactoryAutoConfiguration,\
  67. org.springframework.boot.autoconfigure.jms.activemq.ActiveMQAutoConfiguration,\
  68. org.springframework.boot.autoconfigure.jms.artemis.ArtemisAutoConfiguration,\
  69. org.springframework.boot.autoconfigure.jersey.JerseyAutoConfiguration,\
  70. org.springframework.boot.autoconfigure.jooq.JooqAutoConfiguration,\
  71. org.springframework.boot.autoconfigure.jsonb.JsonbAutoConfiguration,\
  72. org.springframework.boot.autoconfigure.kafka.KafkaAutoConfiguration,\
  73. org.springframework.boot.autoconfigure.availability.ApplicationAvailabilityAutoConfiguration,\
  74. org.springframework.boot.autoconfigure.ldap.embedded.EmbeddedLdapAutoConfiguration,\
  75. org.springframework.boot.autoconfigure.ldap.LdapAutoConfiguration,\
  76. org.springframework.boot.autoconfigure.liquibase.LiquibaseAutoConfiguration,\
  77. org.springframework.boot.autoconfigure.mail.MailSenderAutoConfiguration,\
  78. org.springframework.boot.autoconfigure.mail.MailSenderValidatorAutoConfiguration,\
  79. org.springframework.boot.autoconfigure.mongo.embedded.EmbeddedMongoAutoConfiguration,\
  80. org.springframework.boot.autoconfigure.mongo.MongoAutoConfiguration,\
  81. org.springframework.boot.autoconfigure.mongo.MongoReactiveAutoConfiguration,\
  82. org.springframework.boot.autoconfigure.mustache.MustacheAutoConfiguration,\
  83. org.springframework.boot.autoconfigure.neo4j.Neo4jAutoConfiguration,\
  84. org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration,\
  85. org.springframework.boot.autoconfigure.quartz.QuartzAutoConfiguration,\
  86. org.springframework.boot.autoconfigure.r2dbc.R2dbcAutoConfiguration,\
  87. org.springframework.boot.autoconfigure.r2dbc.R2dbcTransactionManagerAutoConfiguration,\
  88. org.springframework.boot.autoconfigure.rsocket.RSocketMessagingAutoConfiguration,\
  89. org.springframework.boot.autoconfigure.rsocket.RSocketRequesterAutoConfiguration,\
  90. org.springframework.boot.autoconfigure.rsocket.RSocketServerAutoConfiguration,\
  91. org.springframework.boot.autoconfigure.rsocket.RSocketStrategiesAutoConfiguration,\
  92. org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration,\
  93. org.springframework.boot.autoconfigure.security.servlet.UserDetailsServiceAutoConfiguration,\
  94. org.springframework.boot.autoconfigure.security.servlet.SecurityFilterAutoConfiguration,\
  95. org.springframework.boot.autoconfigure.security.reactive.ReactiveSecurityAutoConfiguration,\
  96. org.springframework.boot.autoconfigure.security.reactive.ReactiveUserDetailsServiceAutoConfiguration,\
  97. org.springframework.boot.autoconfigure.security.rsocket.RSocketSecurityAutoConfiguration,\
  98. org.springframework.boot.autoconfigure.security.saml2.Saml2RelyingPartyAutoConfiguration,\
  99. org.springframework.boot.autoconfigure.sendgrid.SendGridAutoConfiguration,\
  100. org.springframework.boot.autoconfigure.session.SessionAutoConfiguration,\
  101. org.springframework.boot.autoconfigure.security.oauth2.client.servlet.OAuth2ClientAutoConfiguration,\
  102. org.springframework.boot.autoconfigure.security.oauth2.client.reactive.ReactiveOAuth2ClientAutoConfiguration,\
  103. org.springframework.boot.autoconfigure.security.oauth2.resource.servlet.OAuth2ResourceServerAutoConfiguration,\
  104. org.springframework.boot.autoconfigure.security.oauth2.resource.reactive.ReactiveOAuth2ResourceServerAutoConfiguration,\
  105. org.springframework.boot.autoconfigure.solr.SolrAutoConfiguration,\
  106. org.springframework.boot.autoconfigure.task.TaskExecutionAutoConfiguration,\
  107. org.springframework.boot.autoconfigure.task.TaskSchedulingAutoConfiguration,\
  108. org.springframework.boot.autoconfigure.thymeleaf.ThymeleafAutoConfiguration,\
  109. org.springframework.boot.autoconfigure.transaction.TransactionAutoConfiguration,\
  110. org.springframework.boot.autoconfigure.transaction.jta.JtaAutoConfiguration,\
  111. org.springframework.boot.autoconfigure.validation.ValidationAutoConfiguration,\
  112. org.springframework.boot.autoconfigure.web.client.RestTemplateAutoConfiguration,\
  113. org.springframework.boot.autoconfigure.web.embedded.EmbeddedWebServerFactoryCustomizerAutoConfiguration,\
  114. org.springframework.boot.autoconfigure.web.reactive.HttpHandlerAutoConfiguration,\
  115. org.springframework.boot.autoconfigure.web.reactive.ReactiveWebServerFactoryAutoConfiguration,\
  116. org.springframework.boot.autoconfigure.web.reactive.WebFluxAutoConfiguration,\
  117. org.springframework.boot.autoconfigure.web.reactive.error.ErrorWebFluxAutoConfiguration,\
  118. org.springframework.boot.autoconfigure.web.reactive.function.client.ClientHttpConnectorAutoConfiguration,\
  119. org.springframework.boot.autoconfigure.web.reactive.function.client.WebClientAutoConfiguration,\
  120. org.springframework.boot.autoconfigure.web.servlet.DispatcherServletAutoConfiguration,\
  121. org.springframework.boot.autoconfigure.web.servlet.ServletWebServerFactoryAutoConfiguration,\
  122. org.springframework.boot.autoconfigure.web.servlet.error.ErrorMvcAutoConfiguration,\
  123. org.springframework.boot.autoconfigure.web.servlet.HttpEncodingAutoConfiguration,\
  124. org.springframework.boot.autoconfigure.web.servlet.MultipartAutoConfiguration,\
  125. org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration,\
  126. org.springframework.boot.autoconfigure.websocket.reactive.WebSocketReactiveAutoConfiguration,\
  127. org.springframework.boot.autoconfigure.websocket.servlet.WebSocketServletAutoConfiguration,\
  128. org.springframework.boot.autoconfigure.websocket.servlet.WebSocketMessagingAutoConfiguration,\
  129. org.springframework.boot.autoconfigure.webservices.WebServicesAutoConfiguration,\
  130. org.springframework.boot.autoconfigure.webservices.client.WebServiceTemplateAutoConfiguration

以上的类都是通过 application*.yaml 中的属性配置自动装载成 bean。这些类比较多，可以自行探索

6. 失败分析器

  1. org.springframework.boot.diagnostics.FailureAnalyzer=\
  2. org.springframework.boot.autoconfigure.data.redis.RedisUrlSyntaxFailureAnalyzer,\
  3. org.springframework.boot.autoconfigure.diagnostics.analyzer.NoSuchBeanDefinitionFailureAnalyzer,\
  4. org.springframework.boot.autoconfigure.flyway.FlywayMigrationScriptMissingFailureAnalyzer,\
  5. org.springframework.boot.autoconfigure.jdbc.DataSourceBeanCreationFailureAnalyzer,\
  6. org.springframework.boot.autoconfigure.jdbc.HikariDriverConfigurationFailureAnalyzer,\
  7. org.springframework.boot.autoconfigure.r2dbc.ConnectionFactoryBeanCreationFailureAnalyzer,\
  8. org.springframework.boot.autoconfigure.session.NonUniqueSessionRepositoryFailureAnalyzer

这些类都比较简单，可以自行探索

7. 检查模板可用提供器

  1. org.springframework.boot.autoconfigure.template.TemplateAvailabilityProvider=\
  2. org.springframework.boot.autoconfigure.freemarker.FreeMarkerTemplateAvailabilityProvider,\
  3. org.springframework.boot.autoconfigure.mustache.MustacheTemplateAvailabilityProvider,\
  4. org.springframework.boot.autoconfigure.groovy.template.GroovyTemplateAvailabilityProvider,\
  5. org.springframework.boot.autoconfigure.thymeleaf.ThymeleafTemplateAvailabilityProvider,\
  6. org.springframework.boot.autoconfigure.web.servlet.JspTemplateAvailabilityProvider

这些类都比较简单，可以自行探索

后续

更多博客，查看 https://github.com/senntyou/blogs

作者：深予之 (@senntyou)

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