BitMap

实例操作

public Result sign() {
    Long id = UserHolder.getUser().getId();

    LocalDateTime now = LocalDateTime.now();
    String format = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));

    int dayOfMonth = now.getDayOfMonth() ;

    String key = USER_SIGN_KEY + id + format;

    stringRedisTemplate.opsForValue().setBit(key, dayOfMonth-1, true);


    return Result.ok();
}

@Override
public Result signCount() {
    Long id = UserHolder.getUser().getId();

    LocalDateTime now = LocalDateTime.now();
    String format = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));

    int dayOfMonth = now.getDayOfMonth();

    String key = USER_SIGN_KEY + id + format;


    List<Long> longs = stringRedisTemplate.opsForValue().bitField(key,
            BitFieldSubCommands.create()
                    .get(BitFieldSubCommands
                            .BitFieldType
                            .unsigned(dayOfMonth))//unsigned无符号
                    .valueAt(0)//开始位置
    );

    if (longs == null || longs.isEmpty()) {
        return Result.ok(0);
    }
    Long aLong;
    aLong = longs.get(0);
    if (aLong == null || aLong == 0) {
        Result.ok(0);
    }
    int count = 0;
    while (true) {
        if ((aLong & 1) == 0) {
            break;
        } else {
            count++;
        }
        aLong >>>= 1;//无符号位移
    }
    return Result.ok(count);
}