SpringBoot使用Redisson实现分布式锁（秒杀系统）

Z时代
2024-01-10
分类：综合

前面讲完了Redis的分布式锁的实现，接下来讲Redisson的分布式锁的实现，一般提及到Redis的分布式锁我们更多的使用的是Redisson的分布式锁，Redis的官方也是建议我们这样去做的。Redisson点我可以直接跳转到Redisson的官方文档。

1.1、引入Maven依赖


<dependency>
 <groupId>org.redisson</groupId>
 <artifactId>redisson-spring-boot-starter</artifactId>
 <version>3.10.6</version>
</dependency>

注意：我这里引入的是redisson和springboot的集成包，网上一些教程可能是引入如下配置


<dependency>
 <groupId>org.redisson</groupId>
 <artifactId>redisson</artifactId>
 <version>3.6.1</version>
</dependency>

如果你引入的就是redisson的依赖包，如果该依赖包的版本低于3.5会需要你再引入


<dependency>
 <groupId>io.netty</groupId>
 <artifactId>netty-all</artifactId>
 <version>4.1.25.Final</version>
</dependency>
<dependency>
 <groupId>com.fasterxml.jackson.core</groupId>
 <artifactId>jackson-core</artifactId>
 <version>2.9.0</version>
</dependency>
<dependency>
 <groupId>com.fasterxml.jackson.core</groupId>
 <artifactId>jackson-databind</artifactId>
 <version>2.9.0</version>
</dependency>

这样的一些依赖。

1.2、配置redis信息

spring:
  application:
    name: spring-cloud-product
  redis:
    port: 6379
    host: 127.0.0.1
    password:
    database: 0
    timeout: 2000

1.3、配置redisson

新建一个redisson-single.yml的配置文件下面是单机配置

singleServerConfig:

idleConnectionTimeout: 10000

pingTimeout: 1000

connectTimeout: 10000

timeout: 3000

retryAttempts: 3

retryInterval: 1500

reconnectionTimeout: 3000

failedAttempts: 3

password: null

subscriptionsPerConnection: 5

clientName: null

address: "redis://127.0.0.1:6379"

subscriptionConnectionMinimumIdleSize: 1

subscriptionConnectionPoolSize: 50

connectionMinimumIdleSize: 32

connectionPoolSize: 64

database: 0

#在最新版本中dns的检查操作会直接报错所以我直接注释掉了

#dnsMonitoring: false

dnsMonitoringInterval: 5000

threads: 0

nettyThreads: 0

codec: !<org.redisson.codec.JsonJacksonCodec> {}

transportMode : "NIO"

1.4、写一个RedissonConfig配置类来配置你的redisson


/**
* @Description //TODO
* @Date $ $
* @Author huangwb
**/
@Configuration
public class RedssonConfig {
 @Bean(destroyMethod="shutdown")
 public RedissonClient redisson() throws IOException {
  RedissonClient redisson = Redisson.create(
    Config.fromYAML(new ClassPathResource("redisson-single.yml").getInputStream()));
  return redisson;
 }
}

1.5、编写一个秒杀接口


@Autowired
private RedissonClient redissonClient;
@Override
public boolean decrementProductStore(Long productId, Integer productQuantity) {
 String key = "dec_store_lock_" + productId;
 RLock lock = redissonClient.getLock(key);
 try {
  //加锁 操作很类似Java的ReentrantLock机制
  lock.lock();
  ProductInfo productInfo = productInfoMapper.selectByPrimaryKey(productId);
  //如果库存为空
  if (productInfo.getProductStock() == 0) {
   return false;
  }
  //简单减库存操作 没有重新写其他接口了
  productInfo.setProductStock(productInfo.getProductStock() - 1);
  productInfoMapper.updateByPrimaryKey(productInfo);
 } catch (Exception e) {
  System.out.println(e.getMessage());
 } finally {
  //解锁
  lock.unlock();
 }
 return true;
}

1.6、写一个简单的测试请求


@GetMapping("test")
public String createOrderTest() {
 if (!productInfoService.decrementProductStore(1L, 1)) {
  return "库存不足";
 }
 OrderMaster orderMaster = new OrderMaster();
 //未支付
 orderMaster.setOrderStatus(0);
 //未支付
 orderMaster.setPayStatus(0);
 orderMaster.setBuyerName(name);
 orderMaster.setBuyerAddress("湖南长沙");
 orderMaster.setBuyerPhone("18692794847");
 orderMaster.setOrderAmount(BigDecimal.ZERO);
 orderMaster.setCreateTime(DateUtils.getCurrentDate());
 orderMaster.setOrderId(UUID.randomUUID().toString().replaceAll("-", ""));
 orderMasterService.insert(orderMaster);
 return "创建订单成功";
}