Validator containerNumber

ValidatorUtils.java

/**
     * 是否为柜号
     *
     * @param containerNumber 输入值
     * @return 真/假
     */
    public static Boolean isContainerNumber(String containerNumber) {
        if (containerNumber.length() == 11) {
            String regEx = "^[a-zA-Z]{4}\\d{7}$";
            Pattern p = Pattern.compile(regEx);
            Matcher m = p.matcher(containerNumber);
            if (!m.matches()) {
                return false;
            }
            Map<String, Integer> dictionary = Maps.newHashMap();
            int number = 10;
            List<String> specials = Lists.newArrayList("B", "L", "V");
            for (char i = 97; i <= 122; i++) {
                String letter = String.valueOf(i).toUpperCase();
                if (specials.contains(letter)) {
                    number++;
                }
                dictionary.put(letter, number++);
            }
            double sum = 0;
            for (int i = 0; i < containerNumber.length() - 1; i++) {
                String key = getSingleWord(containerNumber, i);
                Integer temp = dictionary.get(key);
                if (temp != null) {
                    sum += temp * Math.pow(2, i);
                } else {
                    sum += Integer.parseInt(key) * Math.pow(2, i);
                }
            }
            return Double.parseDouble(getSingleWord(containerNumber, containerNumber.length() - 1)) == (sum % 11) % 10;
        }
        return false;
    }

    /**
     * 获取指定位置的单字
     *
     * @param value 字符串
     * @param index 下标
     * @return 单字
     */
    public static String getSingleWord(String value, Integer index) {
        return String.valueOf(value.toCharArray()[index]);
    }