An object's 15-and 18-digit Chinese mainland ID card number parsing and verification tool

Import Java. text. simpledateformat; import Java. util. date;/*** ID card number, which can parse fields of the ID card number and verify whether the ID card number is valid <br> * ID card number composition: 6-digit address code + 8-digit birthday code + 3-digit sequence code + 1-digit Verification Code ** @ author liuex **/public class idcard {/*** complete ID card number */private final string cardNumber; // check whether the cached ID card is valid because the verification validity is frequently used and the calculation of complicated private Boolean cachevalidateresult = NULL; // cache the birth date, because the birth date is frequently used and complicated calculation is private date cachebirthdate = NULL; Public Boolean validate () {If (null = CAC Hevalidateresult) {boolean result = true; // ID card number cannot be blank result = Result & (null! = CardNumber); // The length of the ID card number is 18 (New certificate) Result = Result & new_card_number_length = cardNumber. length (); // the first 17 digits of the ID card number must be Arabic numerals for (INT I = 0; Result & I <new_card_number_length-1; I ++) {char CH = cardNumber. charat (I); Result = Result & ch> = '0' & Ch <= '9 ';} // The 18th-digit verification of the ID card number is correct. Result = Result & (calculateverifycode (cardNumber) = cardNumber. charat (new_card_number_length-1); // The date of birth cannot be later than the current time, and cannot be earlier than 1900 try {Date birthdate = This. getbirthdate (); Result = Result & null! = Birthdate; Result = Result & birthdate. before (new date (); Result = Result & birthdate. after (minimal_birth_date);/*** the year, month, and day of the birth date must be correct. For example, the month range is [], and the date range is []. you also need to verify that * the month and date are consistent with */string birthdaypart = This. getbirthdaypart (); string realbirthdaypart = This. createbirthdateparser (). format (birthdate); Result = Result & (birthdaypart. equals (realbirthdaypart);} catch (exception e) {result = False;} // cachevalidateresult = Boolean. valueof (result);} return cachevalidateresult;}/*** if it is a 15-digit ID card number, it is automatically converted to 18-digit ** @ Param cardNumber */Public idcard (string cardNumber) {If (null! = CardNumber) {cardNumber = cardNumber. trim (); If (old_card_number_length = cardNumber. length () {cardNumber = conterttonewcardnumber (cardNumber) ;}} this. cardNumber = cardNumber;} Public String getcardnumber () {return cardNumber;} Public String getaddresscode () {This. checkifvalid (); return this. cardNumber. substring (0, 6);} public date getbirthdate () {If (null = This. cachebirthdate) {try {This. cachebirt Hdate = This. createbirthdateparser (). parse (this. getbirthdaypart ();} catch (exception e) {Throw new runtimeexception ("the birth date of the ID card is invalid");} return new date (this. cachebirthdate. gettime ();} public Boolean ismale () {return 1 = This. getgendercode ();} public Boolean isfemal () {return false = This. ismale ();}/*** gets the ID card's 17th digits. The odd number is male, and the even number is female ** @ return */private int getgendercode () {This. checkifvalid (); char gender Code = This. cardNumber. charat (new_card_number_length-2); Return (INT) (gendercode-'0') & 0x1);} private string getbirthdaypart () {return this. cardNumber. substring (6, 14);} private simpledateformat createbirthdateparser () {return New simpledateformat (birth_date_format);} private void checkifvalid () {If (false = This. validate () {Throw new runtimeexception ("Incorrect ID number! ") ;}}// The birthdate format in the ID card number is private final static string birth_date_format =" yyyymmdd "; // The minimum birthdate of the ID card, january 1, 1900 private final static date minimal_birth_date = new date (-2209017600000l); Private Final Static int new_card_number_length = 18; private final static int old_card_number_length = 15; /*** last verification code in 18-digit ID card */private final static char [] verify_code = {'1', '0', 'x', '9 ', '8', '7', '6', '5', '4', '3', '2 '};/*** Weight of each digit in the 18-digit ID card */private final static int [] verify_code_weight = {7, 9, 10, 5, 8, 4, 2, 18th, 3, 7, 9, 10, 5, 8, 4, 2};/*** <li> check code (digits ): <br/> * <ul> * <li> the weighted summation formula S = sum (ai * WI), I = 0... 16. First, sum the weights of the first 17 digits. * Ai: indicates the ID card number at position I. Digital value wi: indicates the Weighted Factor wi at position I: 7 9 10 5 8 4 2 1 6 3 7 9 10 5 8 4*2; </LI> * <li> computing mode y = Mod (S, 11) </LI> * <li> use the modulo to obtain the corresponding verification code Y: 0 1 2 3 4 5 6 7 8 9 10.: 1 0x9 8 7 6 5 4 3 2 </LI> * </ul> ** @ Param cardNumber * @ return */Private Static char calculateverifycode (charsequence cardNumber) {int sum = 0; For (INT I = 0; I <new_card_number_length-1; I ++) {char CH = cardNumber. charat (I); sum + = (INT) (CH-'0') * verify_code_weight [I];} return verify_code [Sum % 11];} /*** convert the 15-digit ID card number to the 18-digit ID card number <br> * the difference between the 15-digit ID card number and the 18-digit ID card number is: <br> In * 1 and 15 ID card numbers, the "Year of birth" field is two characters During conversion, you must add "19", indicating that the 20th century <br> * 2 and 15 ID cards do not have the last verification code. In the 18-digit ID card, the verification code generates ** @ Param cardNumber * @ return */Private Static string conterttonewcardnumber (string oldcardnumber) {stringbuilder Buf = new stringbuilder (new_card_number_length ); buf. append (oldcardnumber. substring (0, 6); Buf. append ("19"); Buf. append (oldcardnumber. substring (6); Buf. append (idcard. calculateverifycode (BUF); Return Buf. tostring ();}}