Redis适用于高并发的递增 递减功能

递增指令：incr（默认从0开始）

递减指令：decr（默认从0开始，递减会出现负数，这点跟memcache不一样,mc到0）

如下：

附上shardedJedisPool和JedisCluster的两种实现方式：

shardedJedisPool：

@Overridepublic Long decr(String key) {ShardedJedis jedis = null;Long result = 0l;try {jedis = shardedJedisPool.getResource();result = jedis.decr(key);} catch (Exception e) {log.error("redis decr error and key = " + key, e);}return result;}@Overridepublic Long incr(String key) {ShardedJedis jedis = null;Long result = 0l;try {jedis = shardedJedisPool.getResource();result = jedis.incr(key);} catch (Exception e) {log.error("redis incr error and key = " + key, e);}return result;}

JedisCluster：

@Overridepublic Long decr(String key) {Long result = 0l;try {result = jedisCluster.decr(key);} catch (Exception e) {log.error("jedisCluster decr error and key = " + key, e);}return result;}@Overridepublic Long incr(String key) {Long result = 0l;try {result = jedisCluster.incr(key);} catch (Exception e) {log.error("jedisCluster incr error and key = " + key, e);}return result;}

适用场景：

高并发生成订单号，秒杀类的业务逻辑等。。