springboot项⽬进⾏事务控制
1、引⼊spring-tx依赖
<dependency>
<groupId&batis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.2.0</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。
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。
3、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，
3、按住Ctrl点击查看AutoConfigurationImportSelector源码
public String[] selectImports(AnnotationMetadata annotationMetadata) {
if (!this.isEnabled(annotationMetadata)) {
return NO_IMPORTS;
} else {
AutoConfigurationMetadata autoConfigurationMetadata = AutoConfigurationMetadataLoader.loadMetadata(this.beanClassLoader);
AutoConfigurationImportSelector.AutoConfigurationEntry autoConfigurationEntry = AutoConfigurationEntry(autoConfigurationMetadata, annotationMetadata);
Configurations());
}
}
到⾃动获得的Entry，进⼊其源代码：
protected AutoConfigurationImportSelector.AutoConfigurationEntry getAutoConfigurationEntry(AutoC
onfigurationMetadata autoConfigurationMetadata, AnnotationMetadata annotationMetadata) { if (!this.isEnabled(annotationMetadata)) {
return EMPTY_ENTRY;
} else {
AnnotationAttributes attributes = Attributes(annotationMetadata);
List<String> configurations = CandidateConfigurations(annotationMetadata, attributes);
configurations = veDuplicates(configurations);
Set<String> exclusions = Exclusions(annotationMetadata, attributes);
this.checkExcludedClasses(configurations, exclusions);
configurations = this.filter(configurations, autoConfigurationMetadata);
this.fireAutoConfigurationImportEvents(configurations, exclusions);
return new AutoConfigurationImportSelector.AutoConfigurationEntry(configurations, exclusions);
}
}
protected List<String> getCandidateConfigurations(AnnotationMetadata metadata, AnnotationAttributes attributes) {
List<String> configurations = SpringFactoriesLoader.SpringFactoriesLoaderFactoryClass(), BeanClassLoader());
return configurations;
}
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
# 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.CloudServiceConnectorsAutoConfiguration,\
org.springframework.t.ConfigurationPropertiesAutoConfiguration,\
org.springframework.t.MessageSourceAutoConfiguration,\
org.springframework.t.PropertyPlaceholderAutoConfiguration,\
org.springframework.uchbase.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.uchbase.CouchbaseDataAutoConfiguration,\
org.springframework.boot.uchbase.CouchbaseReactiveDataAutoConfiguration,\
org.springframework.boot.uchbase.CouchbaseReactiveRepositoriesAutoConfiguration,\
org.springframework.boot.uchbase.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.MongoDataAutoConfiguration,\
org.springframework.boot.MongoReactiveDataAutoConfiguration,\
org.springframework.boot.MongoReactiveRepositoriesAutoConfiguration,\
org.springframework.boot.MongoRepositoriesAutoConfiguration,\
org.springframework.boot.4j.Neo4jDataAutoConfiguration,\
org.springframework.boot.4j.Neo4jRepositoriesAutoConfiguration,\
org.springframework.boot.autoconfigure.data.solr.SolrRepositoriesAutoConfiguration,\
org.springframework.boot.dis.RedisAutoConfiguration,\
org.springframework.boot.dis.RedisReactiveAutoConfiguration,\
org.springframework.boot.dis.RedisRepositoriesAutoConfiguration,\
org.springframework.boot.st.RepositoryRestMvcAutoConfiguration,\
org.springframework.boot.autoconfigure.data.web.SpringDataWebAutoConfiguration,\
org.springframework.boot.autoconfigure.elasticsearch.jest.JestAutoConfiguration,\
org.springframework.boot.st.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.http.HttpMessageConvertersAutoConfiguration,\
org.springframework.boot.dec.CodecsAutoConfiguration,\
org.springframework.boot.autoconfigure.influx.InfluxDbAutoConfiguration,\
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.vy.template.GroovyTemplateAutoConfiguration,\
org.springframework.boot.autoconfigure.jersey.JerseyAutoConfiguration,\
org.springframework.boot.autoconfigure.jooq.JooqAutoConfiguration,\
org.springframework.boot.autoconfigure.jsonb.JsonbAutoConfiguration,\
org.springframework.boot.autoconfigure.kafka.KafkaAutoConfiguration,\
org.springframework.boot.bedded.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.embedded.EmbeddedMongoAutoConfiguration,\
org.springframework.MongoAutoConfiguration,\
org.springframework.MongoReactiveAutoConfiguration,\
org.springframework.boot.autoconfigure.mustache.MustacheAutoConfiguration,\
org.springframework.jpa.HibernateJpaAutoConfiguration,\
org.springframework.boot.autoconfigure.quartz.QuartzAutoConfiguration,\
org.springframework.ReactorCoreAutoConfiguration,\
org.springframework.boot.autoconfigure.security.servlet.SecurityAutoConfiguration,\
org.springframework.boot.autoconfigure.security.servlet.SecurityRequestMatcherProviderAutoConfiguration,\
org.springframework.boot.autoconfigure.security.servlet.UserDetailsServiceAutoConfiguration,\
org.springframework.boot.autoconfigure.security.servlet.SecurityFilterAutoConfiguration,\
org.springframework.boot.active.ReactiveSecurityAutoConfiguration,\
org.springframework.boot.active.ReactiveUserDetailsServiceAutoConfiguration,\
org.springframework.boot.autoconfigure.sendgrid.SendGridAutoConfiguration,\
org.springframework.boot.autoconfigure.session.SessionAutoConfiguration,\
org.springframework.boot.autoconfigure.security.oauth2.client.servlet.OAuth2ClientAutoConfiguration,\
org.springframework.boot.autoconfigure.security.active.ReactiveOAuth2ClientAutoConfiguration,\
org.springframework.boot.autoconfigure.source.servlet.OAuth2ResourceServerAutoConfiguration,\
org.springframework.boot.autoconfigure.active.ReactiveOAuth2ResourceServerAutoConfiguration,\ org.springframework.boot.autoconfigure.solr.SolrAutoConfiguration,\
org.springframework.boot.autoconfigure.task.TaskExecutionAutoConfiguration,\
org.springframework.boot.autoconfigure.task.TaskSchedulingAutoConfiguration,\
org.springframework.boot.autoconfigure.thymeleaf.ThymeleafAutoConfiguration,\
org.springframework.ansaction.TransactionAutoConfiguration,\
org.springframework.ansaction.jta.JtaAutoConfiguration,\
org.springframework.boot.autoconfigure.validation.ValidationAutoConfiguration,\
org.springframework.boot.autoconfigure.web.client.RestTemplateAutoConfiguration,\
org.springframework.boot.bedded.EmbeddedWebServerFactoryCustomizerAutoConfiguration,\
org.springframework.boot.active.HttpHandlerAutoConfiguration,\
org.springframework.boot.active.ReactiveWebServerFactoryAutoConfiguration,\
org.springframework.boot.active.WebFluxAutoConfiguration,\
org.springframework.boot.ErrorWebFluxAutoConfiguration,\
org.springframework.boot.active.function.client.ClientHttpConnectorAutoConfiguration,\
org.springframework.boot.active.function.client.WebClientAutoConfiguration,\
org.springframework.boot.autoconfigure.web.servlet.DispatcherServletAutoConfiguration,\
org.springframework.boot.autoconfigure.web.servlet.ServletWebServerFactoryAutoConfiguration,\
org.springframework.boot.autoconfigure.ErrorMvcAutoConfiguration,\
org.springframework.boot.autoconfigure.web.servlet.HttpEncodingAutoConfiguration,\
org.springframework.boot.autoconfigure.web.servlet.MultipartAutoConfiguration,\
org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration,\
org.springframework.boot.active.WebSocketReactiveAutoConfiguration,\
org.springframework.boot.autoconfigure.websocket.servlet.WebSocketServletAutoConfiguration,\
org.springframework.boot.autoconfigure.websocket.servlet.WebSocketMessagingAutoConfiguration,\
org.springframework.boot.autoconfigure.webservices.WebServicesAutoConfiguration,\
org.springframework.boot.autoconfigure.webservices.client.WebServiceTemplateAutoConfiguration
上⾯配置⽂件存在⼤量的以Configuration为结尾的类名称，这些类就是存有⾃动配置信息的类，⽽SpringApplication在获取这些类名后再加载
点击TransactionAutoConfiguration查看源代码：
@Configuration
@ConditionalOnClass({PlatformTransactionManager.class})
@AutoConfigureAfter({JtaAutoConfiguration.class, HibernateJpaAutoConfiguration.class, DataSourceTransactionManagerAutoConfiguration.class, Neo4jDataAutoConfiguration.class}) @EnableConfigurationProperties({TransactionProperties.class})
public class TransactionAutoConfiguration {
public TransactionAutoConfiguration() {
}
@Bean
@ConditionalOnMissingBean
public TransactionManagerCustomizers platformTransactionManagerCustomizers(ObjectProvider<Pl
atformTransactionManagerCustomizer<?>> customizers) {
return new TransactionManagerCustomizers((deredStream().List()));
}
@Configuration
@ConditionalOnBean({PlatformTransactionManager.class})
@ConditionalOnMissingBean({AbstractTransactionManagementConfiguration.class})
public static class EnableTransactionManagementConfiguration {springboot框架的作用
public EnableTransactionManagementConfiguration() {
}
@Configuration
@EnableTransactionManagement(
proxyTargetClass = true
)
@ConditionalOnProperty(
prefix = "spring.aop",
name = {"proxy-target-class"},
havingValue = "true",
matchIfMissing = true
)
public static class CglibAutoProxyConfiguration {
public CglibAutoProxyConfiguration() {
}
}
@Configuration
@EnableTransactionManagement(
proxyTargetClass = false
)
@ConditionalOnProperty(
prefix = "spring.aop",
name = {"proxy-target-class"},
havingValue = "false",
matchIfMissing = false
)
public static class JdkDynamicAutoProxyConfiguration {
public JdkDynamicAutoProxyConfiguration() {
}
}
}
@Configuration
@ConditionalOnSingleCandidate(PlatformTransactionManager.class)
public static class TransactionTemplateConfiguration {
private final PlatformTransactionManager transactionManager;
public TransactionTemplateConfiguration(PlatformTransactionManager transactionManager) {
}
@Bean
@ConditionalOnMissingBean
public TransactionTemplate transactionTemplate() {
return new ansactionManager);
}
}
}
这个开启事务的管理其实与我们今天所说的@EnableTransactionManagement源代码说的是⼀样的，所以此注解可加与不可加是没有问题的。

版权声明：本站内容均来自互联网，仅供演示用，请勿用于商业和其他非法用途。如果侵犯了您的权益请与我们联系QQ:729038198，我们将在24小时内删除。