dependencygroupIdorg.mybatis.spring.boot/groupIdartifactIdmybatis-spring-boot-starter/artifactIdversion1.2.0/version/dependency
和事务相关的jar包spring-tx-5.0.2.RELEASE.jar，spring框架为我们提供了一组事务控制的接口。这组接口是在spring-tx-5.0.2.RELEASE.jar中。
spring-data.redis中含有spring-tx依赖
mybatis-spring-boot-starter中也有spring-txjar包
2、在启动类中添加EnableTransactionManagement注解开启事务（这步可以省略）注意：springboot项目中，启动类不添加
EnableTransactionManagement注解也可以开启事务。、在Service实现类中添加Transactional注解springboot为何不使用EnableTransactionManagement就能使用事务？有些注解如果每个人配置时都是一样的，在springboot中，我们可以将这些注解设置为默认。
自动配置原理解析：
1、按住Ctrl点击查看启动类MySpringBootApplication上的注解
SpringBootApplication，注解SpringBootApplication的源码如下：EnableAutoConfiguration：开启SpringBoot自动配置功能2、按住Ctrl点击查看注解
EnableAutoConfiguration其中，
Import(AutoConfigurationImportSelector.class)导入了AutoConfigurationImportSelector类，、按住Ctrl点击查看AutoConfigurationImportSelector源码
publicString[]selectImports(AnnotationMetadataannotationMetadata){if(!this.isEnabled(annotationMetadata)){returnNO_IMPORTS;}else{AutoConfigurationMetadataautoConfigurationMetadata=AutoConfigurationMetadataLoader.loadMetadata(this.beanClassLoader);AutoConfigurationImportSelector.AutoConfigurationEntryautoConfigurationEntry=this.getAutoConfigurationEntry(autoConfigurationMetadata,annotationMetadata);returnStringUtils.toStringArray(autoConfigurationEntry.getConfigurations());}}
找到自动获得的Entry，进入其源代码：
protectedAutoConfigurationImportSelector.AutoConfigurationEntrygetAutoConfigurationEntry(AutoConfigurationMetadataautoConfigurationMetadata,AnnotationMetadataannotationMetadata){if(!this.isEnabled(annotationMetadata)){returnEMPTY_ENTRY;}else{AnnotationAttributesattributes=this.getAttributes(annotationMetadata);ListStringconfigurations=this.getCandidateConfigurations(annotationMetadata,attributes);configurations=this.removeDuplicates(configurations);SetStringexclusions=this.getExclusions(annotationMetadata,attributes);this.checkExcludedClasses(configurations,exclusions);configurations.removeAll(exclusions);configurations=this.filter(configurations,autoConfigurationMetadata);this.fireAutoConfigurationImportEvents(configurations,exclusions);returnnewAutoConfigurationImportSelector.AutoConfigurationEntry(configurations,exclusions);}}protectedListStringgetCandidateConfigurations(AnnotationMetadatametadata,AnnotationAttributesattributes){ListStringconfigurations=SpringFactoriesLoader.loadFactoryNames(this.getSpringFactoriesLoaderFactoryClass(),this.getBeanClassLoader());Assert.notEmpty(configurations,"NoautoconfigurationclassesfoundinMETA-INF/spring.factories.Ifyouareusingacustompackaging,makesurethatfileiscorrect.");returnconfigurations;}
其中，SpringFactoriesLoader.loadFactoryNames方法的作用就是从META-INF/spring.factories文件中读取指定类对应的类名称列表
#AutoConfigureorg.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.CloudServiceConnectorsAutoConfiguration,\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.CassandraReactiveDataAutoConfiguration,\org.springframework.boot.autoconfigure.data.cassandra.CassandraReactiveRepositoriesAutoConfiguration,\org.springframework.boot.autoconfigure.data.cassandra.CassandraRepositoriesAutoConfiguration,\org.springframework.boot.autoconfigure.data.couchbase.CouchbaseDataAutoConfiguration,\org.springframework.boot.autoconfigure.data.couchbase.CouchbaseReactiveDataAutoConfiguration,\org.springframework.boot.autoconfigure.data.couchbase.CouchbaseReactiveRepositoriesAutoConfiguration,\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.jdbc.JdbcRepositoriesAutoConfiguration,\org.springframework.boot.autoconfigure.data.jpa.JpaRepositoriesAutoConfiguration,\org.springframework.boot.autoconfigure.data.ldap.LdapRepositoriesAutoConfiguration,\org.springframework.boot.autoconfigure.data.mongo.MongoDataAutoConfiguration,\org.springframework.boot.autoconfigure.data.mongo.MongoReactiveDataAutoConfiguration,\org.springframework.boot.autoconfigure.data.mongo.MongoReactiveRepositoriesAutoConfiguration,\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.RedisReactiveAutoConfiguration,\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.elasticsearch.rest.RestClientAutoConfiguration,\org.springframework.boot.autoconfigure.flyway.FlywayAutoConfiguration,\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.