生成规则：Q+年后两位+月+日卡券类型+八位字母和数字随机

public class xxxGenerator {

    private char[] arr = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F','G','H','J','K','L','M','N',
                          'P','Q','R','S','T','U','V','W','X','Y','Z'};
    private Integer bitCount = 8;
    /**
    * @desc   : 生成规则：Q+年后两位+月+日卡券类型+八位字母和数字随机
    **/
    public String generator(xxTypeEnum type){
        LocalDateTime nowTime = LocalDateTime.now();
        StringBuffer sb = new StringBuffer();
        sb.append("Q");
        sb.append(String.valueOf(nowTime.getYear()).substring(2,4));
        sb.append(String.format("%02d",nowTime.getMonthValue()));
        sb.append(String.format("%02d",nowTime.getDayOfMonth()));
        sb.append(type.getValue());
        Random random = new Random();
        for(int i=0;i<bitCount;i++){
            sb.append(arr[random.nextInt(arr.length)]);
        }
        log.info("生成xx：{}",sb.toString());
        return sb.toString();
    }

    public Set<String> next(TypeEnum type, int quantity){
        Set<String> codes = Sets.newHashSet();
        for (;codes.size() < quantity;){
//            String uuid = UUID.randomUUID().toString().replace("-", "");
            String code = generator(type);
            codes.add(code);
        }

        return codes;
    }
}