业务需求中经常有需要用到计数器的场景：为了防止恶意刷接口，需要设置一个接口每个IP一分钟、一天等的调用次数阈值；为了降低费用，限制发送短信的次数等。使用Redis的Incr自增命令可以轻松实现以上需求，而且避免验证码带来的弊端，如不够人性化，用户操作时间长、体验差等。以一个接口每个IP每分钟限制调用100次为例：
private boolean isDenied(String ip){
SimpleDateFormat sdf = new SimpleDateFormat("YYYYMMDDHHmm");
String time = sdf.format(Calendar.getInstance().getTime());
long count=JedisUtil.setIncr(time +"_"+ip+"_IP", 86400);
if(count<=100){
return false;
}
return true;
}
public class JedisUtil {
protected final static Logger logger = Logger.getLogger(JedisUtil.class);
private static JedisPool jedisPool;
@Autowired(required = true)
public void setJedisPool(JedisPool jedisPool) {
JedisUtil.jedisPool = jedisPool;
}
/**
* 对某个键的值自增
* @author liboyi
* @param key 键
* @param cacheSeconds 超时时间，0为不超时
* @return
*/
public static long setIncr(String key, int cacheSeconds) {
long result = 0;
Jedis jedis = null;
try {
jedis = jedisPool.getResource();
result =jedis.incr(key);
if (cacheSeconds != 0) {
jedis.expire(key, cacheSeconds);
}
logger.debug("set "+ key + " = " + result);
} catch (Exception e) {
logger.warn("set "+ key + " = " + result);
} finally {
jedisPool.returnResource(jedis);
}
return result;
}
}
参考文献：https://blog.csdn.net/qq_33556185/article/details/79427271