java测试生成中征码(包含字母、数字)

public static void main(String[] args) {
        String val =genSixToSixteenPsw();
        System.out.println("企业中征码为：" + val);
    }

    /**
     * 随机14位中证码
     * @return
     */
    public static String genSixToSixteenPsw() {
        String val = "";
        Random random = new Random();
        //长度14位
        int numbers = 14;
        for (int i = 0; i < numbers; i++) {
            // 输出字母还是数字
            String charOrNum = random.nextInt(2) % 2 == 0 ? "char" : "num";
            // 字符串
            if ("char".equalsIgnoreCase(charOrNum)) {
                //取得大写字母还是小写字母
                int choice = random.nextInt(2) % 2 == 0 ? 65 : 97;
                val += (char) (choice + random.nextInt(26));
            } else if ("num".equalsIgnoreCase(charOrNum)) {
                // 数字
                val += String.valueOf(random.nextInt(10));
            }
        }
        return checkZZM(val.toUpperCase());
    }

    //校验中征码
    public static String checkZZM(String value) {
        //判断中征码前14位
        if (value.length()!=14) {
            return "";
        }
        //前14位转化为char数组
        char[] idCode = value.substring(0, 14).toCharArray();
        //加权因子
        int[] weight_factor = new int[]{1, 3, 5, 7, 11, 2, 13, 1, 1, 17, 19, 97, 23, 29};
        int len = idCode.length;
        int num = 0;
        int temp = 0;
        //循环取和
        for (int i = 0; i < len; i++) {
            //字母转数字
            if (idCode[i] >= 'A' && idCode[i] <= 'Z') {
                temp = (int) idCode[i] - 55;
            } else {
                temp = (int) idCode[i] - 48;
            }
            //求和
            num = num + temp * weight_factor[i];
        }
        //取余+1
        int resisue = num % 97 + 1;
        System.out.println("生成2位验证码为："+resisue);
        //拼接验证码
        value = value + resisue;
        //判断中征码是否为16位
        if (value.length()!=16) {
            return "";
        }
        return value;
    }