bitmap with Redis in Java

bitmap_redis.java

 @Test
    public void testBitGet() {
        //redisTemplate.opsForValue().setBit("user2.flags",0,true);
        BitSet value = redisTemplate.execute(new RedisCallback<BitSet>() {
            public BitSet doInRedis(RedisConnection redis) throws DataAccessException {
                return fromByteArrayReverse(redis.get("user.1.flags".getBytes()));
            }
        });
        System.out.println(value);
    }

    private BitSet fromByteArrayReverse(final byte[] bytes) {
        final BitSet bits = new BitSet();
        for (int i = 0; i < bytes.length * 8; i++) {
            if ((bytes[i / 8] & (1 << (7 - (i % 8)))) != 0) {
                bits.set(i);
            }
        }
        return bits;
    }