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<dependency>
      <groupId>org.redisson</groupId>
      <artifactId>redisson</artifactId>
      <version>3.15.5</version>
</dependency>

@Configuration
public class LockConfig {

    @Bean
    public RedissonClient redissonClient(){
        Config config = new Config();
        config.useSingleServer().setAddress("redis://xx.xx.xx.xx:6379").setPassword("xxxxx");
        return Redisson.create(config);
    }
}

@Service
public class LockService {

    public static int stock = 100;

    @Resource
    private RedissonClient redissonClient;

    public boolean getStock(){
        RLock lock = redissonClient.getLock("lock-test3");
        try {
            lock.lock();
            if(stock <= 0){
                return false;
            }
            stock--;
            System.out.println("线程名称 = " + Thread.currentThread().getName() + ", 库存数量 = " + stock);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            lock.unlock();
        }
        return true;
    }
}