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中国居民身份证号码编码规则

中国居民身份证校验码算法

Java代码示例

public class Validator {
    private static final int[] WEIGHTS = {7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2};

    public static boolean validate(String idCardNumber) {
        if (idCardNumber.length() != 18) {
            return false;
        }

        int sum = 0;
        for (int i = 0; i < 17; i++) {
            char c = idCardNumber.charAt(i);
            if (!Character.isDigit(c)) {
                return false;
            }
            int digit = c - '0';
            sum += digit * WEIGHTS[i];
        }
        
        //取余数
        int remainder = sum % 11;
        //计算校验码
        char expectedCheckDigit = getCheckDigit(remainder);
        char actualCheckDigit = idCardNumber.charAt(17);
        return expectedCheckDigit == actualCheckDigit;
    }

    private static char getCheckDigit(int remainder) {
        switch (remainder) {
            case 0:
                return '1';
            case 1:
                return '0';
            case 2:
                return 'X';
            case 3:
                return '9';
            case 4:
                return '8';
            case 5:
                return '7';
            case 6:
                return '6';
            case 7:
                return '5';
            case 8:
                return '4';
            case 9:
                return '3';
            case 10:
                return '2';
            default:
                throw new IllegalArgumentException("Invalid remainder: " + remainder);
        }
    }
}