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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);
}
}
@iangerolamo
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iangerolamo commented Mar 7, 2021

muito obrigado maestro

@gleds3000
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gleds3000 commented Mar 25, 2021

Muito bom, obrigado por compartilhar!

@williamartins02
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williamartins02 commented Apr 10, 2021

Obrigado Guerrero, me ajudou muito no projeto do Nélio Alves.

@RicardoTSilva2303
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RicardoTSilva2303 commented Apr 23, 2021

Muito obrigado Luis, me ajudou bastante.

@piresalexsandro
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piresalexsandro commented May 8, 2021

Obrigado!!!

@gogaoliveira
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gogaoliveira commented May 12, 2021

top

@angelosuporte
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angelosuporte commented Jun 7, 2021

Obrigado

@PortelaVictor
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PortelaVictor commented Jul 3, 2021

Obrigado Luis, ajudou bastante.

@jrsguitar
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jrsguitar commented Jul 13, 2021

Muito obrigado!

@Pedrolaires
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Pedrolaires commented Jan 14, 2022

Até hoje ajudando muita gente, obrigado!

@newtonneto
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newtonneto commented Jan 21, 2022

Muito obrigado

@charllysonsouza
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charllysonsouza commented Jan 22, 2022

Obrigado! Estou vindo pelo curso do Nélio da Udemy. Valeu!

@lissa-sonoda
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lissa-sonoda commented Mar 2, 2022

Muito obrigada, Luis!! Ajudou demais!!

@marland-tales
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marland-tales commented Apr 5, 2022

Tks bro!

@MarcioGomes78
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MarcioGomes78 commented Jul 3, 2022

Obrigado em ajudar com seu conhecimento um abraço.

@yujiyamamoto64
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yujiyamamoto64 commented Jul 25, 2022

Passando pra agradecer tbm!

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