默而識之，學而不厭，誨人不倦。
如果文中有錯誤之處，望指正！

以下內(nèi)容參考鏈接：
https://www.cnblogs.com/lishupeng/p/6306446.html
https://www.cnblogs.com/czq520/p/11764601.html

/**
* 權(quán)重位
*/
private static int[] w = {7, 9, 10, 5, 8, 4, 2, 1, 6,
        3, 7, 9, 10, 5, 8, 4, 2};


/**
* 校驗碼字符數(shù)組
*/
private static char[] verifyCode = {'1','0','X','9','8','7','6','5','4','3','2'};

/**
* 判斷是否為合法身份證號
* @param idCard
* @return
*/
public static boolean isCard(String idCard) {


    // 1. 如果為空或位數(shù)不對則
    if(StringUtils.isBlank(idCard) || ( idCard.length() != 15 && idCard.length() != 18)){
        return false;
    }


    // 2. 如果是15位身份證號轉(zhuǎn)成18位
    if( idCard.length() == 15){
        try {
            idCard = getEighteenIdCard(idCard);
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }


    // 3. 校驗身份證號
    char[] c = idCard.toCharArray();
    int sum = 0;
    for (int i = 0; i < w.length; i++) {
        sum += (c[i] - '0') * w[i];
    }
    char[] verifyCode = "10X98765432".toCharArray();
    char ch = verifyCode[sum % 11];
    return c[17] == ch;
}


/**
* 15位身份證 轉(zhuǎn)18位
* @param fifteenIdCard
* @return
* @throws Exception
*/
public static String getEighteenIdCard(String fifteenIdCard) throws Exception {


    // 1. 判斷是否為15位身份證號
    if (fifteenIdCard != null && fifteenIdCard.length() == 15) {


        // 2. 拼接成18位身份證號
        StringBuilder eighteenIdCard = new StringBuilder();
        eighteenIdCard
                .append(fifteenIdCard.substring(0,6))
                .append("19")
                .append(fifteenIdCard.substring(6))
                .append(getVerifyCode(eighteenIdCard.toString()));
        return eighteenIdCard.toString();
    } else {
        throw new Exception("不是15位的身份證");
    }
}


/**
*  獲取身份證的校驗碼
*  lsp  2017年1月19日13:47:52
* @param idCardNumber
* @return
* @throws Exception
*/
public static char getVerifyCode(String idCardNumber) throws Exception {

    // 1. 非空和小于17位判斷
    if (StringUtils.isBlank(idCardNumber) || idCardNumber.length() == 15) {
        throw new Exception("不合法的身份證號碼");
    }


    // 2. 生成校驗碼
    char[] Ai = idCardNumber.toCharArray();
    int S = 0;
    int Y;
    for (int i = 0; i < w.length; i++) {
        S += (Ai[i] - '0') * w[i];
    }
    Y = S % 11;
    return verifyCode[Y];
}

/**
* 測試
* @param args
*/
public static void main(String[] args) {
    System.out.println(isCard("220182190001018888"));
}