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通过身份证校验位检验身份证正确性

算法:

W[] = 7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2

∑(a[i]×W[i])(mod 11)

校验位:1 0 X 9 8 7 6 5 4 3 2

举个栗子:

身份证号:102154198801238569

a[] = 10215419880123856

身份证每一位和W[]每一位相乘后求和,模除以11,取校验位相应的位数即可

代码实现

package utils;

import java.text.ParseException;
import java.text.SimpleDateFormat;

/**
 * Created by lwg
 */
public class BankUtils {
    /**
     * 校验身份证号
     *
     * @param idCardNo 身份证号
     * @return true通过,false未通过
     */
    public static boolean checkIdCardNo(String idCardNo) {
        if (null == idCardNo) {
            return false;
        }
        idCardNo = idCardNo.toLowerCase();
        if (null == idCardNo || (idCardNo.length() != 18 && idCardNo.length() != 15)) {
            return false;
        }
        String[] RC = {"1", "0", "x", "9", "8", "7", "6", "5", "4", "3", "2"};
        boolean checkBirthday;
        String birthday;

        try {
            if (idCardNo.length() == 18) {// 18位
                birthday = idCardNo.substring(6, 14);
                checkBirthday = isDate(birthday, "yyyyMMdd");

                int[] W = {7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2};
                int sum = 0;
                for (int i = 0; i < idCardNo.length() - 1; i++) {
                    int c = Integer.parseInt(idCardNo.substring(i, i + 1));
                    sum += W[i] * c;
                }
                int r = sum % 11;
                if (RC[r].equals(idCardNo.substring(17)) && checkBirthday) {
                    return true;
                } else {
                    return false;
                }
            } else {//15位
                birthday = "19" + idCardNo.substring(6, 12);
                checkBirthday = isDate(birthday, "yyyyMMdd");
                if (checkBirthday) {
                    return true;
                } else {
                    return false;
                }
            }
        } catch (NumberFormatException e) {
            e.printStackTrace();
            return false;
        }
    }

    /**
     * 是否为合法日期
     *
     * @param dateString 日期
     * @param format     指定日期格式为四位年/两位月份/两位日期,注意yyyy/MM/dd区分大小写;
     * @return
     */
    public static boolean isDate(String dateString, String format) {
        boolean convertSuccess = true;
        // 指定日期格式为四位年/两位月份/两位日期,注意yyyy/MM/dd区分大小写;
        SimpleDateFormat smf = new SimpleDateFormat(format);
        try {
            // 设置lenient为false. 否则SimpleDateFormat会比较宽松地验证日期,比如2007/02/29会被接受,并转换成2007/03/01
            smf.setLenient(false);
            smf.parse(dateString);
        } catch (ParseException e) {
            //e.printStackTrace();
            //如果throw java.text.ParseException或者NullPointerException,就说明格式不对
            convertSuccess = false;
        }
        return convertSuccess;
    }
}
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