使用Redis实现秒杀功能的简单方法

redis > WATCH kill_num kill_user

redis > MULTI

redis > DECR kill_num
redis > RPUSH kill_user 10086
redis > EXEC

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

@Autowired
private StringRedisTemplate redisTemplate;

public void kill() {
    // 获取库存
    int killNum = Integer.parseInt(Objects.requireNonNull(redisTemplate.opsForValue().get("kill_num")));
    if (killNum > 0) {
        redisTemplate.watch(Arrays.asList("kill_num", "kill_user"));
        // 开启事务
        redisTemplate.multi();
        // 库存-1
        redisTemplate.opsForValue().decrement("kill_num");
        // 记录秒杀用户id(10086)
        redisTemplate.opsForList().rightPush("kill_user", "10086");
        // 提交事务
        redisTemplate.exec();
    }
}