Java Authentication ID Number

The

/**
* Citizenship number is a feature combination code that consists of a 17-bit digital body code and a one-digit check code. The order of the permutations is from left to right:
* Six-digit address code, eight-digit birth date code, three-digit sequence code, and one digit check code.
* 1, Address code: Indicates the Code object resident account in the county (city, Flag, district) of the administrative codes, according to the provisions of GB/T 2260 implementation.
* 2, date of birth code: Indicates the year, month and day of the birth of the encoded object, according to the provisions of * GB/T 7408 implementation. There is no separator between the year, month, and day code.
* Example: the date of birth of a person is October 26, 1966, and the Birth date code is 19661026.
* 3, Sequence code: Indicates in the same address code identified by the area,
* For the same year, the same month, the same day birth of the number of people born, sequential code of the odd assigned to men, I thousands of assigned to women.
* 4, check code: check code using ISO 7064:1983,mod 11-2 check code system.
* (1) 17-bit digital body Code weighted summation Formula
* S = Sum (Ai * Wi), i = * 0, ..., 16, first 17-digit right sum
* Ai: Represents the number value of the ID number on the position of the first place
* Wi: Indicates Weighted factor at position I
* Wi:7 9 5 8 4 2 1 6 3 7 9 5 8 4 2 1
* (2) calculate modulo Y = mod (S, one)
* (3) get the corresponding check code by modulo
* y:0 1 2 3 4 5 6 7 8 9
* Check code: 1 0 X 9 8 7 6 5 4 3 2
*/
public class Idcard {
//weighted factor
private static final I nt[] weight = new int[] {7, 9, 5, 8, 4, 2, 1, 6,
3, 7, 9, ten, 5, 8, 4, 2, 1};
Check code
private static final int[] Checkdigit = new int[] {1, 0, ' X ', 9, 8, 7, 6,
5, 4, 3, 2};

Public Idcard () {
}
/**
* Verify that the ID is in accordance with the format
* @param idcard
* @return
*/
public boolean Verify (String idcard) {
if (idcard.length () = = 15) {
Idcard = This.update2eighteen (Idcard);
}
if (Idcard.length ()! = 18) {
return false;
}
Get the last one on the input ID, it's a check code
String checkdigit = idcard.substring (17, 18);
Compare the obtained checksum with the checksum generated by this method is equal
if (Checkdigit.equals (This.getcheckdigit (Idcard))) {
return true;
}
return false;
}

/**
* Calculate the check code of 18-digit ID card
* @param eighteenCardID18-ID Card
* @return
*/
private string Getcheckdigit (string eighteencardid) {
int remaining = 0;
if (eighteencardid.length () = = 18) {
Eighteencardid = eighteencardid.substring (0, 17);
}

if (eighteencardid.length () = = 17) {
int sum = 0;
Int[] A = new int[17];
The first 17 digits of the right sum
for (int i = 0; i <; i++) {
String k = eighteencardid.substring (i, i + 1);
A[i] = Integer.parseint (k);
}
for (int i = 0; i <; i++) {
sum = sum + weight[i] * A[i];
}
Again with 11 modulo
remaining = sum% 11;
}
return remaining = = 2? "X": string.valueof (checkdigit[remaining]);
}

/**
* Upgrade 15-digit ID card to 18-digit ID number
* @param fifteencardid
* @return
*/
private string Update2eighteen (string fifteencardid) {
The year on the 15-digit ID card has no 19, plus
String eighteencardid = fifteencardid.substring (0, 6);
Eighteencardid = Eighteencardid + "19";
Eighteencardid = Eighteencardid + fifteencardid.substring (6, 15);
Eighteencardid = Eighteencardid + this.getcheckdigit (eighteencardid);
return eighteencardid;
}

/**
* @param args
*/
public static void Main (string[] args) {
Idcard test = new Idcard ();
String idcardstr = "110105194912310025";
SYSTEM.OUT.PRINTLN ("id" + IDCARDSTR + "authentication qualified?") "
+ Test. Verify (IDCARDSTR));
Idcardstr = "440524188001010014";
SYSTEM.OUT.PRINTLN ("id" + IDCARDSTR + "authentication qualified?") "
+ Test. Verify (IDCARDSTR));
}
}

Java Authentication ID Number