数据过期

/**
 * @ClassName ExpireDemo
 * @Desciption 数据自动过期案例
 * @Author MaRui
 * @Date 2021/8/30 19:38
 * @Version 1.0
 */
public class ExpireDemo {

    private static Jedis jedis = new Jedis("127.0.0.1", 6379);

    public static void main(String[] args) throws InterruptedException {
        jedis.set("test_key", "test_value");
        jedis.expire("test_key", 5);

        TimeUnit.SECONDS.sleep(6);
        String testValue = jedis.get("test_key");
        System.out.println("数据是否过期：" + ((testValue == null || "null".equals(testValue)) ? "是" : "否"));
    }
}

锁的超时释放

/**
 * @ClassName TimeoutDistributeLockDemo
 * @Desciption 支持超时自动释放的分布式案例
 * @Author MaRui
 * @Date 2021/8/30 19:44
 * @Version 1.0
 */
public class TimeoutDistributeLockDemo {

    private static Jedis jedis = new Jedis("127.0.0.1", 6379);

    public static void main(String[] args) {
        TimeoutDistributeLockDemo demo = new TimeoutDistributeLockDemo();
        demo.lock("test_lock", "test_value");
        boolean result = demo.lock("test_lock", "test_value2");
        System.out.println("第二次加锁结果：" + result);
    }

    /**
     * 加锁
     * @param key
     * @param value
     */
    public boolean lock(String key, String value) {
        long result = jedis.setnx(key, value);
        jedis.expire(key, 10);

        return result > 0;
    }

    public void unlock(String key) {
        jedis.del(key);
    }
}