引入 redis 依赖
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-redis</artifactId></dependency>
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spring-boot-starter-data-redis
查看 spring-boot-starter-data-redis jar 包并无特殊内容，再查看依赖关系，引入了spring-data-redis 及lettuce-core, springboot2.x 使用 lettuce 进行链接 redis。
<dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> <version>2.2.5.RELEASE</version> <scope>compile</scope> </dependency> <dependency> <groupId>org.springframework.data</groupId> <artifactId>spring-data-redis</artifactId> <version>2.2.5.RELEASE</version> <scope>compile</scope> <exclusions> <exclusion> <artifactId>jcl-over-slf4j</artifactId> <groupId>org.slf4j</groupId> </exclusion> </exclusions> </dependency> <dependency> <groupId>io.lettuce</groupId> <artifactId>lettuce-core</artifactId> <version>5.2.2.RELEASE</version> <scope>compile</scope> </dependency> </dependencies>
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查看 spring-data-redis 下的 spring.factories,仅有一个 RepositoryFactorySupport 并无自动装配。
org.springframework.data.repository.core.support.RepositoryFactorySupport=org.springframework.data.redis.repository.support.RedisRepositoryFactory
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spring-boot-autoconfigure
redis 自动装配由 spring-boot-autoconfigure 实现。
META-INF 下 spring.factories 中自动配置关于 redis 的配置有
# Auto Configureorg.springframework.boot.autoconfigure.EnableAutoConfiguration=\org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration,\org.springframework.boot.autoconfigure.data.redis.RedisReactiveAutoConfiguration,\org.springframework.boot.autoconfigure.data.redis.RedisRepositoriesAutoConfiguration,\
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META-INF 下 spring-autoconfigure-metadata.properties 中关于 redis 的元数据配置
org.springframework.boot.autoconfigure.data.redis.LettuceConnectionConfiguration=org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration.ConditionalOnClass=org.springframework.data.redis.core.RedisOperationsorg.springframework.boot.autoconfigure.session.RedisReactiveSessionConfiguration.ConditionalOnBean=org.springframework.data.redis.connection.ReactiveRedisConnectionFactoryorg.springframework.boot.autoconfigure.session.RedisSessionConfiguration=org.springframework.boot.autoconfigure.cache.RedisCacheConfiguration.ConditionalOnBean=org.springframework.data.redis.connection.RedisConnectionFactoryorg.springframework.boot.autoconfigure.cache.RedisCacheConfiguration=org.springframework.boot.autoconfigure.cache.RedisCacheConfiguration.AutoConfigureAfter=org.springframework.boot.autoconfigure.data.redis.RedisAutoConfigurationorg.springframework.boot.autoconfigure.data.redis.RedisRepositoriesAutoConfiguration.ConditionalOnClass=org.springframework.data.redis.repository.configuration.EnableRedisRepositoriesorg.springframework.boot.autoconfigure.data.redis.RedisRepositoriesAutoConfiguration=org.springframework.boot.autoconfigure.data.redis.RedisRepositoriesAutoConfiguration.AutoConfigureAfter=org.springframework.boot.autoconfigure.data.redis.RedisAutoConfigurationorg.springframework.boot.autoconfigure.data.redis.RedisReactiveAutoConfiguration=org.springframework.boot.autoconfigure.data.redis.RedisReactiveAutoConfiguration.AutoConfigureAfter=org.springframework.boot.autoconfigure.data.redis.RedisAutoConfigurationorg.springframework.boot.autoconfigure.data.redis.RedisRepositoriesAutoConfiguration.ConditionalOnBean=org.springframework.data.redis.connection.RedisConnectionFactoryorg.springframework.boot.autoconfigure.session.RedisSessionConfiguration.ConditionalOnBean=org.springframework.data.redis.connection.RedisConnectionFactoryorg.springframework.boot.autoconfigure.cache.RedisCacheConfiguration.ConditionalOnClass=org.springframework.data.redis.connection.RedisConnectionFactoryorg.springframework.boot.autoconfigure.session.RedisSessionConfiguration.ConditionalOnClass=org.springframework.data.redis.core.RedisTemplate,org.springframework.session.data.redis.RedisIndexedSessionRepositoryorg.springframework.boot.autoconfigure.data.redis.RedisReactiveAutoConfiguration.ConditionalOnClass=reactor.core.publisher.Flux,org.springframework.data.redis.connection.ReactiveRedisConnectionFactory,org.springframework.data.redis.core.ReactiveRedisTemplateorg.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration=org.springframework.boot.autoconfigure.data.redis.LettuceConnectionConfiguration.ConditionalOnClass=io.lettuce.core.RedisClientorg.springframework.boot.autoconfigure.session.RedisReactiveSessionConfiguration.ConditionalOnClass=org.springframework.data.redis.connection.ReactiveRedisConnectionFactory,org.springframework.session.data.redis.ReactiveRedisSessionRepositoryorg.springframework.boot.autoconfigure.session.RedisReactiveSessionConfiguration=org.springframework.boot.autoconfigure.data.redis.JedisConnectionConfiguration.ConditionalOnClass=org.apache.commons.pool2.impl.GenericObjectPool,redis.clients.jedis.Jedis,org.springframework.data.redis.connection.jedis.JedisConnectionorg.springframework.boot.autoconfigure.data.redis.JedisConnectionConfiguration=org.springframework.boot.autoconfigure.session.SessionAutoConfiguration.AutoConfigureAfter=org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration,org.springframework.boot.autoconfigure.hazelcast.HazelcastAutoConfiguration,org.springframework.boot.autoconfigure.jdbc.JdbcTemplateAutoConfiguration,org.springframework.boot.autoconfigure.data.mongo.MongoDataAutoConfiguration,org.springframework.boot.autoconfigure.data.mongo.MongoReactiveDataAutoConfiguration,org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration,org.springframework.boot.autoconfigure.data.redis.RedisReactiveAutoConfigurationorg.springframework.boot.autoconfigure.cache.CacheAutoConfiguration.AutoConfigureAfter=org.springframework.boot.autoconfigure.couchbase.CouchbaseAutoConfiguration,org.springframework.boot.autoconfigure.hazelcast.HazelcastAutoConfiguration,org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration,org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration
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RedisAutoConfiguration 开启条件 @ConditionalOnClass
metadata 中也指定了配置 ConditionalOnClass 开启条件指定的类 RedisOperations
org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration.ConditionalOnClass=org.springframework.data.redis.core.RedisOperations
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RedisAutoConfiguration 类
配置类加载了配置属性类 RedisProperties，导入了配置 LettuceConnectionConfiguration、JedisConnectionConfiguration
通过使用 @ConditionalOnMissingBean 配置了默认的 bean redisTemplate、StringRedisTemplate
@Configuration(proxyBeanMethods = false)@ConditionalOnClass(RedisOperations.class)@EnableConfigurationProperties(RedisProperties.class)@Import({ LettuceConnectionConfiguration.class, JedisConnectionConfiguration.class })public class RedisAutoConfiguration {
@Bean @ConditionalOnMissingBean(name = "redisTemplate") public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) throws UnknownHostException { RedisTemplate<Object, Object> template = new RedisTemplate<>(); template.setConnectionFactory(redisConnectionFactory); return template; }
@Bean @ConditionalOnMissingBean public StringRedisTemplate stringRedisTemplate(RedisConnectionFactory redisConnectionFactory) throws UnknownHostException { StringRedisTemplate template = new StringRedisTemplate(); template.setConnectionFactory(redisConnectionFactory); return template; }
}
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RedisReactiveAutoConfiguration
@AutoConfigureAfter(RedisAutoConfiguration.class) 在 RedisAutoConfiguration 自动配置完成后才会加载
@Configuration(proxyBeanMethods = false)@ConditionalOnClass({ ReactiveRedisConnectionFactory.class, ReactiveRedisTemplate.class, Flux.class })@AutoConfigureAfter(RedisAutoConfiguration.class)public class RedisReactiveAutoConfiguration { @Bean @ConditionalOnMissingBean(name = "reactiveRedisTemplate") @ConditionalOnBean(ReactiveRedisConnectionFactory.class) public ReactiveRedisTemplate<Object, Object> reactiveRedisTemplate( ReactiveRedisConnectionFactory reactiveRedisConnectionFactory, ResourceLoader resourceLoader) { JdkSerializationRedisSerializer jdkSerializer = new JdkSerializationRedisSerializer( resourceLoader.getClassLoader()); RedisSerializationContext<Object, Object> serializationContext = RedisSerializationContext .newSerializationContext().key(jdkSerializer).value(jdkSerializer).hashKey(jdkSerializer) .hashValue(jdkSerializer).build(); return new ReactiveRedisTemplate<>(reactiveRedisConnectionFactory, serializationContext); }
@Bean @ConditionalOnMissingBean(name = "reactiveStringRedisTemplate") @ConditionalOnBean(ReactiveRedisConnectionFactory.class) public ReactiveStringRedisTemplate reactiveStringRedisTemplate( ReactiveRedisConnectionFactory reactiveRedisConnectionFactory) { return new ReactiveStringRedisTemplate(reactiveRedisConnectionFactory); }}
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RedisRepositoriesAutoConfiguration
@AutoConfigureAfter(RedisAutoConfiguration.class) 同样在 RedisAutoConfiguration 自动配置完成后才会加载
@Configuration(proxyBeanMethods = false)@ConditionalOnClass(EnableRedisRepositories.class)@ConditionalOnBean(RedisConnectionFactory.class)@ConditionalOnProperty(prefix = "spring.data.redis.repositories", name = "enabled", havingValue = "true", matchIfMissing = true)@ConditionalOnMissingBean(RedisRepositoryFactoryBean.class)@Import(RedisRepositoriesRegistrar.class)@AutoConfigureAfter(RedisAutoConfiguration.class)public class RedisRepositoriesAutoConfiguration {
}
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总结
redis 配置由 springBoot 集成，在 spring-boot-autoconfigure 中配置，spring.factories 中 EnableAutoConfiguration 指定自动配置类 RedisAutoConfiguration 进行自动配置，spring-configuration-metadata.properties 指定了配置元数据 RedisAutoConfiguration ConditionalOnClass 配置条件 RedisOperations，当引入 spring-data-redis 时存在类路径 RedisOperations 进行 redis 的自动加载。redis 自动配置使用 Lettuce 作为 client 进行连接，配置了默认的 bean redisTemplate、StringRedisTemplate。
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