Java随机生成信用卡卡号的代码

左手的ㄟ右手 2022-07-13 07:08 245阅读 0赞

import java.util.List;
    import java.util.Stack;
    import java.util.Vector;
    
    /** * See the license below. Obviously, this is not a Javascript credit card number * generator. However, The following class is a port of a Javascript credit card * number generator. * * @author robweber * */
    public class RandomCreditCardNumberGenerator { 
        /* * Javascript credit card number generator Copyright (C) 2006-2012 Graham King * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General * Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * * www.darkcoding.net */
    
        public static final String[] VISA_PREFIX_LIST = new String[] { "4539",
                "4556", "4916", "4532", "4929", "40240071", "4485", "4716", "4" };
    
        public static final String[] MASTERCARD_PREFIX_LIST = new String[] { "51",
                "52", "53", "54", "55" };
    
        public static final String[] AMEX_PREFIX_LIST = new String[] { "34", "37" };
    
        public static final String[] DISCOVER_PREFIX_LIST = new String[] { "6011" };
    
        public static final String[] DINERS_PREFIX_LIST = new String[] { "300",
                "301", "302", "303", "36", "38" };
    
        public static final String[] ENROUTE_PREFIX_LIST = new String[] { "2014",
                "2149" };
    
        public static final String[] JCB_PREFIX_LIST = new String[] { "35" };
    
        public static final String[] VOYAGER_PREFIX_LIST = new String[] { "8699" };
    
        static String strrev(String str) {
            if (str == null)
                return "";
            String revstr = "";
            for (int i = str.length() - 1; i >= 0; i--) {
                revstr += str.charAt(i);
            }
    
            return revstr;
        }
    
        /* * 'prefix' is the start of the CC number as a string, any number of digits. * 'length' is the length of the CC number to generate. Typically 13 or 16 */
        static String completed_number(String prefix, int length) {
    
            String ccnumber = prefix;
    
            // generate digits
    
            while (ccnumber.length() < (length - 1)) {
                ccnumber += new Double(Math.floor(Math.random() * 10)).intValue();
            }
    
            // reverse number and convert to int
    
            String reversedCCnumberString = strrev(ccnumber);
    
            List<Integer> reversedCCnumberList = new Vector<Integer>();
            for (int i = 0; i < reversedCCnumberString.length(); i++) {
                reversedCCnumberList.add(new Integer(String
                        .valueOf(reversedCCnumberString.charAt(i))));
            }
    
            // calculate sum
    
            int sum = 0;
            int pos = 0;
    
            Integer[] reversedCCnumber = reversedCCnumberList
                    .toArray(new Integer[reversedCCnumberList.size()]);
            while (pos < length - 1) {
    
                int odd = reversedCCnumber[pos] * 2;
                if (odd > 9) {
                    odd -= 9;
                }
    
                sum += odd;
    
                if (pos != (length - 2)) {
                    sum += reversedCCnumber[pos + 1];
                }
                pos += 2;
            }
    
            // calculate check digit
    
            int checkdigit = new Double(
                    ((Math.floor(sum / 10) + 1) * 10 - sum) % 10).intValue();
            ccnumber += checkdigit;
    
            return ccnumber;
    
        }
    
        public static String[] credit_card_number(String[] prefixList, int length,
                int howMany) {
    
            Stack<String> result = new Stack<String>();
            for (int i = 0; i < howMany; i++) {
                int randomArrayIndex = (int) Math.floor(Math.random()
                        * prefixList.length);
                String ccnumber = prefixList[randomArrayIndex];
                result.push(completed_number(ccnumber, length));
            }
    
            return result.toArray(new String[result.size()]);
        }
    
        public static String[] generateMasterCardNumbers(int howMany) {
            return credit_card_number(MASTERCARD_PREFIX_LIST, 16, howMany);
        }
    
        public static String generateMasterCardNumber() {
            return credit_card_number(MASTERCARD_PREFIX_LIST, 16, 1)[0];
        }
    
        public static boolean isValidCreditCardNumber(String creditCardNumber) {
            boolean isValid = false;
    
            try {
                String reversedNumber = new StringBuffer(creditCardNumber)
                        .reverse().toString();
                int mod10Count = 0;
                for (int i = 0; i < reversedNumber.length(); i++) {
                    int augend = Integer.parseInt(String.valueOf(reversedNumber
                            .charAt(i)));
                    if (((i + 1) % 2) == 0) {
                        String productString = String.valueOf(augend * 2);
                        augend = 0;
                        for (int j = 0; j < productString.length(); j++) {
                            augend += Integer.parseInt(String.valueOf(productString
                                    .charAt(j)));
                        }
                    }
    
                    mod10Count += augend;
                }
    
                if ((mod10Count % 10) == 0) {
                    isValid = true;
                }
            } catch (NumberFormatException e) {
            }
    
            return isValid;
        }
    
        public static void main(String[] args) {
            int howMany = 0;
            try {
                howMany = Integer.parseInt(args[0]);
            } catch (Exception e) {
                System.err
                        .println("Usage error. You need to supply a numeric argument (ex: 500000)");
            }
            String[] creditcardnumbers = generateMasterCardNumbers(howMany);
            for (int i = 0; i < creditcardnumbers.length; i++) {
                System.out.println(creditcardnumbers[i]
                        + ":"
                        + (isValidCreditCardNumber(creditcardnumbers[i]) ? "valid"
                                : "invalid"));
            }
        }
    }
    //该代码片段来自于: http://www.sharejs.com/codes/java/7103