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java后台验证 身份证号码格式是否正确

        /**

* 校验身份证

* 

* @param idcard

* @return

*/

public boolean verify(String idcard) {

if (idcard.length() == 15) {

idcard = uptoeighteen(idcard);

}

if (idcard.length() != 18) {

return false;

}

String verify = idcard.substring(17, 18);

if (verify.equals(getVerify(idcard))) {

return true;

}

return false;

}

// 15位转18位

public String uptoeighteen(String fifteen) {

StringBuffer eighteen = new StringBuffer(fifteen);

eighteen = eighteen.insert(6, "19");

return eighteen.toString();

}

// 计算最后一位校验值

public String getVerify(String eighteen) {

int remain = 0;

if (eighteen.length() == 18) {

eighteen = eighteen.substring(0, 17);

}

if (eighteen.length() == 17) {

int sum = 0;

for (int i = 0; i < 17; i++) {

String k = eighteen.substring(i, i + 1);

ai[i] = Integer.valueOf(k);

}

for (int i = 0; i < 17; i++) {

sum += wi[i] * ai[i];

}

remain = sum % 11;

}

return remain == 2 ? "X" : String.valueOf(vi[remain]);

}

// wi =2(n-1)(mod 11);加权因子

final int[] wi = { 7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2, 1 };

// 校验码

final int[] vi = { 1, 0, 'X', 9, 8, 7, 6, 5, 4, 3, 2 };

private int[] ai = new int[18];

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