银行卡验证

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class CheckBankNumber

{

    //Description:  银行卡号Luhm校验

    //Luhm校验规则�?6位银行卡号（19位�?用）:

    // 1.将未带校验位�?15（或18）位卡号从右依次编号 1 �?15�?8），位于奇数位号上的数字乘以 2�?

    // 2.将奇位乘积的个十位全部相加，再加上所有偶数位上的数字�?

    // 3.将加法和加上校验位能�?10 整除�?

    //�?��6�?

    //private  final static String strBin = "10,18,30,35,37,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,58,60,62,65,68,69,84,87,88,94,95,98,99";

    private final static String SUCCESS="true";

    private final static String BAD_LENGTH="银行卡号长度必须在6到9之间";

    private final static String NOT_NUMBER="银行卡必须全部为数字";

    private final static String ILLEGAL_NUMBER="银行卡不符合规则";

    public static String luhmCheck(String bankno)

    {

        if (bankno.length() < 16 || bankno.length() > 19)

        {

            return BAD_LENGTH;

        }

        Pattern pattern = Pattern.compile("[0-9]*");

        Matcher match = pattern.matcher(bankno);

        if (match.matches() == false) {

            return NOT_NUMBER;

        }

        int lastNum=Integer.parseInt(bankno.substring(bankno.length()-1,bankno.length()));

        String first15Num=bankno.substring(0,bankno.length()-1);

        //System.out.println(first15Num);

        char[] newArr = new char[first15Num.length()];    //倒叙装入newArr

        char[] tempArr = first15Num.toCharArray();

        for(int i = 0; i < tempArr.length ; i++)

        {

            newArr[tempArr.length-1-i] = tempArr[i];

        }

        int[] arrSingleNum = new int[newArr.length]; 

        int[] arrSingleNum2 = new int[newArr.length];

        int[] arrDoubleNum=new int[newArr.length]; 

        for(int j = 0;j < newArr.length; j++)

        {

            if((j+1)%2==1)

            {

                if((int)(newArr[j]-48)*2<9)

                    arrSingleNum[j]=(int)(newArr[j]-48)*2;

                else

                    arrSingleNum2[j]=(int)(newArr[j]-48)*2;

            }

            else

                arrDoubleNum[j]=(int)(newArr[j]-48);

        }

        int[] arrSingleNumChild = new int[newArr.length]; //奇数�?2 >9 的分割之后的数组个位�?

        int[] arrSingleNum2Child = new int[newArr.length];//奇数�?2 >9 的分割之后的数组十位�?

        for(int h=0;h<arrSingleNum2.length;h++)

        {

            arrSingleNumChild[h] = (arrSingleNum2[h])%10;

            arrSingleNum2Child[h] = (arrSingleNum2[h])/10;

        }   

        int sumSingleNum=0; 

        int sumDoubleNum=0;

        int sumSingleNumChild=0; 

        int sumSingleNum2Child=0; 

        int sumTotal=0;

        for(int m=0;m<arrSingleNum.length;m++)

        {

            sumSingleNum=sumSingleNum+arrSingleNum[m];

        }

        for(int n=0;n<arrDoubleNum.length;n++)

        {

            sumDoubleNum=sumDoubleNum+arrDoubleNum[n];

        }

        for(int p=0;p<arrSingleNumChild.length;p++)

        {

            sumSingleNumChild=sumSingleNumChild+arrSingleNumChild[p];

            sumSingleNum2Child=sumSingleNum2Child+arrSingleNum2Child[p];

        }     

        sumTotal=sumSingleNum+sumDoubleNum+sumSingleNumChild+sumSingleNum2Child;

        int k= sumTotal%10==0?10:sumTotal%10;       

        int luhm= 10-k;

        if(lastNum == luhm)

        {

            return SUCCESS;//验证通过

        }

        else

        {

            return ILLEGAL_NUMBER;

        }     

    }

    public static void main(String[] args) {

        String bankno = "4096708281160908";

        System.out.println(bankno+":"+luhmCheck(bankno));

        String bankno1 = "4096708281160909";

        System.out.println(bankno1+":"+luhmCheck(bankno1));

        String bankno2 = "4296708281160908";

        System.out.println(bankno2+":"+luhmCheck(bankno2));

    }

}