java 18位和15位身份证号校验

好的，以下是Java实现的18位和15位身份证号校验的方法：

1. 18位身份证号校验：

public static boolean isIDCard18(String idCard) {
    if (idCard == null || idCard.length() != 18) {
        return false;
    }
    char[] chars = idCard.toCharArray();
    int[] ints = new int[17];
    for (int i = 0; i < 17; i++) {
        ints[i] = chars[i] - '0';
        if (ints[i] < 0 || ints[i] > 9) {
            return false;
        }
    }
    int[] coefficients = {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 < 17; i++) {
        sum += coefficients[i] * ints[i];
    }
    int remainder = sum % 11;
    String[] codes = {"1", "0", "X", "9", "8", "7", "6", "5", "4", "3", "2"};
    return codes[remainder].equals(String.valueOf(chars[17]));
}

2. 15位身份证号校验：

public static boolean isIDCard15(String idCard) {
    if (idCard == null || idCard.length() != 15) {
        return false;
    }
    char[] chars = idCard.toCharArray();
    int[] ints = new int[15];
    for (int i = 0; i < 15; i++) {
        ints[i] = chars[i] - '0';
        if (ints[i] < 0 || ints[i] > 9) {
            return false;
        }
    }
    int[] coefficients = {7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8};
    int sum = 0;
    for (int i = 0; i < 15; i++) {
        sum += coefficients[i] * ints[i];
    }
    int remainder = sum % 11;
    String[] codes = {"1", "0", "X", "9", "8", "7", "6", "5", "4", "3", "2"};
    return codes[remainder].equals(String.valueOf(chars[14]));
}

这两个方法都是基于身份证号的校验码计算方法，校验码的计算方式都是一样的。