分布式锁

方式一：

    public static boolean tryLock(Jedis jedis, String lockKey, String uniqueId, long expireTime) {

　　　　private static final String LOCKED_SUCCESS = "OK";
      　　 private static final String NX = "NX";
      　　 private static final String EXPIRE_TIME = "EX";

       　　String result = jedis.set(lockKey, uniqueId, NX, EXPIRE_TIME, expireTime);
       　　return LOCKED_SUCCESS.equals(result);
    }