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Utility class to validate CPF and CNPJ document types. For CPF use isValidSsn and for CNPJ use isValidTfn. Added to repo https://github.com/adrianoluis/misc-tools
public class DocumentUtil {
// CPF
private static final int[] WEIGHT_SSN = {11, 10, 9, 8, 7, 6, 5, 4, 3, 2};
// CNPJ
private static final int[] WEIGHT_TFN = {6, 5, 4, 3, 2, 9, 8, 7, 6, 5, 4, 3, 2};
private static int sum(int[] weight, char[] numbers, int length) {
if (length <= 0) return 0;
final int nIdx = length - 1;
final int wIdx = weight.length > numbers.length ? length : nIdx;
return (sum(weight, numbers, nIdx) + Character.getNumericValue(numbers[nIdx]) * weight[wIdx]);
}
private static int calculate(final String document, final int[] weight) {
final char[] numbers = document.toCharArray();
int sum = sum(weight, numbers, numbers.length);
sum = 11 - (sum % 11);
return sum > 9 ? 0 : sum;
}
private static boolean check(String tfn, int length, int[] weight) {
final String number = tfn.substring(0, length);
final int digit1 = calculate(number, weight);
final int digit2 = calculate(number + digit1, weight);
return tfn.equals(number + digit1 + digit2);
}
/**
* Valida CPF
*/
public static boolean isValidSsn(String ssn) {
if (ssn == null || !ssn.matches("\\d{11}") || ssn.matches(ssn.charAt(0) + "{11}")) return false;
return check(ssn, 9, WEIGHT_SSN);
}
/**
* Valida CNPJ
*/
public static boolean isValidTfn(String tfn) {
if (tfn == null || !tfn.matches("\\d{14}")) return false;
return check(tfn, 12, WEIGHT_TFN);
}
}
@yujiyamamoto64
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yujiyamamoto64 commented Jul 25, 2022

Passando pra agradecer tbm!

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