Spring Boot的自动配置的原理

Spring Boot在进行SpringApplication对象实例化时会加载META-INF/spring.factories文件，将该配置文件中的配置载入到Spring容器。

1.1.1. Maven下载源码

通过 dependency:sources 该命令可以下载该项目中所有的依赖的包的源码。

1.1.2. 源码分析

org.springframework.boot.SpringApplication：

org.springframework.core.io.support.SpringFactoriesLoader:

由此可见，读取该配置文件来加载内容。

1.1.3. Spring.factories文件

 # Initializers

 org.springframework.context.ApplicationContextInitializer=\

 org.springframework.boot.autoconfigure.SharedMetadataReaderFactoryContextInitializer,\

 org.springframework.boot.autoconfigure.logging.AutoConfigurationReportLoggingInitializer

 # Application Listeners

 org.springframework.context.ApplicationListener=\

 org.springframework.boot.autoconfigure.BackgroundPreinitializer

 # Auto Configuration Import Listeners

 org.springframework.boot.autoconfigure.AutoConfigurationImportListener=\

 org.springframework.boot.autoconfigure.condition.ConditionEvaluationReportAutoConfigurationImportListener

 # Auto Configuration Import Filters

 org.springframework.boot.autoconfigure.AutoConfigurationImportFilter=\

 org.springframework.boot.autoconfigure.condition.OnClassCondition

 # Auto Configure

 org.springframework.boot.autoconfigure.EnableAutoConfiguration=\

 org.springframework.boot.autoconfigure.admin.SpringApplicationAdminJmxAutoConfiguration,\

 org.springframework.boot.autoconfigure.aop.AopAutoConfiguration,\

 org.springframework.boot.autoconfigure.amqp.RabbitAutoConfiguration,\

 org.springframework.boot.autoconfigure.batch.BatchAutoConfiguration,\

 org.springframework.boot.autoconfigure.cache.CacheAutoConfiguration,\

 org.springframework.boot.autoconfigure.cassandra.CassandraAutoConfiguration,\

 org.springframework.boot.autoconfigure.cloud.CloudAutoConfiguration,\

 org.springframework.boot.autoconfigure.context.ConfigurationPropertiesAutoConfiguration,\

 org.springframework.boot.autoconfigure.context.MessageSourceAutoConfiguration,\

 org.springframework.boot.autoconfigure.context.PropertyPlaceholderAutoConfiguration,\

 org.springframework.boot.autoconfigure.couchbase.CouchbaseAutoConfiguration,\

 org.springframework.boot.autoconfigure.dao.PersistenceExceptionTranslationAutoConfiguration,\

 org.springframework.boot.autoconfigure.data.cassandra.CassandraDataAutoConfiguration,\

 org.springframework.boot.autoconfigure.data.cassandra.CassandraRepositoriesAutoConfiguration,\

 org.springframework.boot.autoconfigure.data.couchbase.CouchbaseDataAutoConfiguration,\

 org.springframework.boot.autoconfigure.data.couchbase.CouchbaseRepositoriesAutoConfiguration,\

 org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchAutoConfiguration,\

 org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchDataAutoConfiguration,\

 org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchRepositoriesAutoConfiguration,\

 org.springframework.boot.autoconfigure.data.jpa.JpaRepositoriesAutoConfiguration,\

 org.springframework.boot.autoconfigure.data.ldap.LdapDataAutoConfiguration,\

 org.springframework.boot.autoconfigure.data.ldap.LdapRepositoriesAutoConfiguration,\

 org.springframework.boot.autoconfigure.data.mongo.MongoDataAutoConfiguration,\

 org.springframework.boot.autoconfigure.data.mongo.MongoRepositoriesAutoConfiguration,\

 org.springframework.boot.autoconfigure.data.neo4j.Neo4jDataAutoConfiguration,\

 org.springframework.boot.autoconfigure.data.neo4j.Neo4jRepositoriesAutoConfiguration,\

 org.springframework.boot.autoconfigure.data.solr.SolrRepositoriesAutoConfiguration,\

 org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration,\

 org.springframework.boot.autoconfigure.data.redis.RedisRepositoriesAutoConfiguration,\

 org.springframework.boot.autoconfigure.data.rest.RepositoryRestMvcAutoConfiguration,\

 org.springframework.boot.autoconfigure.data.web.SpringDataWebAutoConfiguration,\

 org.springframework.boot.autoconfigure.elasticsearch.jest.JestAutoConfiguration,\

 org.springframework.boot.autoconfigure.freemarker.FreeMarkerAutoConfiguration,\

 org.springframework.boot.autoconfigure.gson.GsonAutoConfiguration,\

 org.springframework.boot.autoconfigure.h2.H2ConsoleAutoConfiguration,\

 org.springframework.boot.autoconfigure.hateoas.HypermediaAutoConfiguration,\

 org.springframework.boot.autoconfigure.hazelcast.HazelcastAutoConfiguration,\

 org.springframework.boot.autoconfigure.hazelcast.HazelcastJpaDependencyAutoConfiguration,\

 org.springframework.boot.autoconfigure.info.ProjectInfoAutoConfiguration,\

 org.springframework.boot.autoconfigure.integration.IntegrationAutoConfiguration,\

 org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration,\

 org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration,\

 org.springframework.boot.autoconfigure.jdbc.JdbcTemplateAutoConfiguration,\

 org.springframework.boot.autoconfigure.jdbc.JndiDataSourceAutoConfiguration,\

 org.springframework.boot.autoconfigure.jdbc.XADataSourceAutoConfiguration,\

 org.springframework.boot.autoconfigure.jdbc.DataSourceTransactionManagerAutoConfiguration,\

 org.springframework.boot.autoconfigure.jms.JmsAutoConfiguration,\

 org.springframework.boot.autoconfigure.jmx.JmxAutoConfiguration,\

 org.springframework.boot.autoconfigure.jms.JndiConnectionFactoryAutoConfiguration,\

 org.springframework.boot.autoconfigure.jms.activemq.ActiveMQAutoConfiguration,\

 org.springframework.boot.autoconfigure.jms.artemis.ArtemisAutoConfiguration,\

 org.springframework.boot.autoconfigure.flyway.FlywayAutoConfiguration,\

 org.springframework.boot.autoconfigure.groovy.template.GroovyTemplateAutoConfiguration,\

 org.springframework.boot.autoconfigure.jersey.JerseyAutoConfiguration,\

 org.springframework.boot.autoconfigure.jooq.JooqAutoConfiguration,\

 org.springframework.boot.autoconfigure.kafka.KafkaAutoConfiguration,\

 org.springframework.boot.autoconfigure.ldap.embedded.EmbeddedLdapAutoConfiguration,\

 org.springframework.boot.autoconfigure.ldap.LdapAutoConfiguration,\

 org.springframework.boot.autoconfigure.liquibase.LiquibaseAutoConfiguration,\

 org.springframework.boot.autoconfigure.mail.MailSenderAutoConfiguration,\

 org.springframework.boot.autoconfigure.mail.MailSenderValidatorAutoConfiguration,\

 org.springframework.boot.autoconfigure.mobile.DeviceResolverAutoConfiguration,\

 org.springframework.boot.autoconfigure.mobile.DeviceDelegatingViewResolverAutoConfiguration,\

 org.springframework.boot.autoconfigure.mobile.SitePreferenceAutoConfiguration,\

 org.springframework.boot.autoconfigure.mongo.embedded.EmbeddedMongoAutoConfiguration,\

 org.springframework.boot.autoconfigure.mongo.MongoAutoConfiguration,\

 org.springframework.boot.autoconfigure.mustache.MustacheAutoConfiguration,\

 org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration,\

 org.springframework.boot.autoconfigure.reactor.ReactorAutoConfiguration,\

 org.springframework.boot.autoconfigure.security.SecurityAutoConfiguration,\

 org.springframework.boot.autoconfigure.security.SecurityFilterAutoConfiguration,\

 org.springframework.boot.autoconfigure.security.FallbackWebSecurityAutoConfiguration,\

 org.springframework.boot.autoconfigure.security.oauth2.OAuth2AutoConfiguration,\

 org.springframework.boot.autoconfigure.sendgrid.SendGridAutoConfiguration,\

 org.springframework.boot.autoconfigure.session.SessionAutoConfiguration,\

 org.springframework.boot.autoconfigure.social.SocialWebAutoConfiguration,\

 org.springframework.boot.autoconfigure.social.FacebookAutoConfiguration,\

 org.springframework.boot.autoconfigure.social.LinkedInAutoConfiguration,\

 org.springframework.boot.autoconfigure.social.TwitterAutoConfiguration,\

 org.springframework.boot.autoconfigure.solr.SolrAutoConfiguration,\

 org.springframework.boot.autoconfigure.thymeleaf.ThymeleafAutoConfiguration,\

 org.springframework.boot.autoconfigure.transaction.TransactionAutoConfiguration,\

 org.springframework.boot.autoconfigure.transaction.jta.JtaAutoConfiguration,\

 org.springframework.boot.autoconfigure.validation.ValidationAutoConfiguration,\

 org.springframework.boot.autoconfigure.web.DispatcherServletAutoConfiguration,\

 org.springframework.boot.autoconfigure.web.EmbeddedServletContainerAutoConfiguration,\

 org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration,\

 org.springframework.boot.autoconfigure.web.HttpEncodingAutoConfiguration,\

 org.springframework.boot.autoconfigure.web.HttpMessageConvertersAutoConfiguration,\

 org.springframework.boot.autoconfigure.web.MultipartAutoConfiguration,\

 org.springframework.boot.autoconfigure.web.ServerPropertiesAutoConfiguration,\

 org.springframework.boot.autoconfigure.web.WebClientAutoConfiguration,\

 org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration,\

 org.springframework.boot.autoconfigure.websocket.WebSocketAutoConfiguration,\

 org.springframework.boot.autoconfigure.websocket.WebSocketMessagingAutoConfiguration,\

 org.springframework.boot.autoconfigure.webservices.WebServicesAutoConfiguration

 # Failure analyzers

 org.springframework.boot.diagnostics.FailureAnalyzer=\

 org.springframework.boot.autoconfigure.diagnostics.analyzer.NoSuchBeanDefinitionFailureAnalyzer,\

 org.springframework.boot.autoconfigure.jdbc.DataSourceBeanCreationFailureAnalyzer,\

 org.springframework.boot.autoconfigure.jdbc.HikariDriverConfigurationFailureAnalyzer

 # Template availability providers

 org.springframework.boot.autoconfigure.template.TemplateAvailabilityProvider=\

 org.springframework.boot.autoconfigure.freemarker.FreeMarkerTemplateAvailabilityProvider,\

 org.springframework.boot.autoconfigure.mustache.MustacheTemplateAvailabilityProvider,\

 org.springframework.boot.autoconfigure.groovy.template.GroovyTemplateAvailabilityProvider,\

 org.springframework.boot.autoconfigure.thymeleaf.ThymeleafTemplateAvailabilityProvider,\

 org.springframework.boot.autoconfigure.web.JspTemplateAvailabilityProvider

1.1.4. 举例：Redis的自动配置

从上述的配置中可以看出，org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration是Redis的自动配置。

内容：

1.1.5. 条件注解

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