20211114 基于Redis实现分布式锁(使用Redisson框架)
原理图
Redis 相关的四种技术
- Jedis
- Lettuce(
spring-boot-starter-data-redis
默认引入) - RedisTemplate
- Redisson
简单使用
操作步骤
-
pom.xml 添加依赖
<dependency> <groupId>org.redisson</groupId> <artifactId>redisson-spring-boot-starter</artifactId> <version>3.16.4</version> </dependency>
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application.properties 配置 Redis 连接信息
spring.redis.host=localhost spring.redis.port=6379 #spring.redis.password=
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简单使用类
import org.redisson.api.RLock; import org.redisson.api.RedissonClient; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; @Service public class MyRedisLock { @Autowired private RedissonClient redissonClient; public void testLock() { RLock rLock = redissonClient.getLock("redisKey"); try { rLock.lock(); Thread.sleep(10000000); } catch (InterruptedException e) { e.printStackTrace(); } finally { if (rLock != null) { rLock.unlock(); } } } }
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Spring Boot 启动类
@SpringBootApplication public class RedisLockApplication { public static void main(String[] args) { ConfigurableApplicationContext applicationContext = SpringApplication.run(RedisLockApplication.class); MyRedisLock myRedisLock = applicationContext.getBean(MyRedisLock.class); myRedisLock.testLock(); } }
实现效果
锁的类型在 Redis 中是 Hash
,默认 TTL 是 30s
,当 TTL 到达 20s 时,会自动延期,TTL 重新回到 30s