Java ID number verification and 15-bit conversion to 18-bit

Package test; Import Java.util.regex.Matcher; Import Java.util.regex.Pattern; /** * ID Card number Verification */public class Identificationcodeutil {public static final int identitycode_old = 15;//old ID card 15-bit public static final int identitycode_new = 18; New ID 18-bit public static int[] Wi = int[17]; /** * To determine whether the ID card number is correct. * @param code * ID number. * @return Returns True if the identity card number is correct, otherwise returns false. */public static Boolean Isidentitycode (String code) {if (Stringutil.empty (code)) {return false;} String birthday = ""; Code = Code.trim (); Only 15 and 182 cases in length if ((Code.length ()!= identitycode_old) && (Code.length ()!= identitycode_new)) {return false;} ID number must be number (18-digit new identity card last one can be x) pattern pt = Pattern.compile ("//d{15,17}" ([//dxx]{1})?); Matcher MT = Pt.matcher (code); if (!mt.find ()) {return false;}//Verify Birthday if (code.length () = = Identitycode_old) {birthday = "" + code.substring (6, 12) ; else {birthday = code.substring (6);} if (! Timeutil.isrightdate (Birthday, "YyyyMMdd")) {return false;}//LastBit check code verification if (code.length () = = identitycode_new) {String lastnum = Getcheckflag (code.substring (0, identitycode_new-1)); Check last digit if (! ("" + Code.charat (identitycode_new-1)). toUpperCase (). Equals (Lastnum)) {return false;}} return true; /** * To obtain the last of the new ID card: Test bit * * @param code * 18 ID of the first 17 * @return The last one of the new ID card/private static string Getcheckflag (string cod e) {int[] vararray = new int[code.length ()]; String lastnum = ""; int numsum = 0; Initialization weight value setwibuffer (); for (int i = 0; i < code.length (); i++) {Vararray[i] = Numberutil.toint ("" + Code.charat (i)); Vararray[i] = vararray[i] * Wi[i]; Numsum = Numsum + vararray[i]; int checkdigit = 12-numsum% 11; Switch (checkdigit) {case 10:lastnum = ' X '; break, case 11:lastnum = ' 0 '; break, case 12:lastnum = ' 1 '; break; default : Lastnum = string.valueof (checkdigit); return lastnum; }/** * Initialization bit value/private static void Setwibuffer () {for (int i = 0; i < wi.length; i++) {int k = (int) Math.pow (2, Wi.length-i)); Wi[i] = k% 11; }/** * Discriminant whether the string is null or has no content, or all spaces. */public static Boolean empty (String o) {return (NULL = O) | | (O.length () <= 0) | | (O.trim (). Equals (""))); /** * Upgrade 15 ID card number to 18 ID card number * * @param code * 15 ID Card number * @return 18-digit ID number/public static string Update2eighteen (String Co DE) {if (Stringutil.empty (code)) {return "";} Code = Code.trim (); if (Code.length ()!= Identitycode_old | |!isidentitycode (code)) {return "";} Code = code.substring (0, 6) + "n" + code.substring (6); Code = code + GETCHECKFLAG (code); return code; public static void Main (string[] args) {string[] Codearray = new string[]{"330521197411044030", "53010119810602007x", " 53010119810602001x "}; for (int i= 0;i<codearray.length;i++) {if (Isidentitycode (codearray[i))) {System.out.println (codearray[i]+) : For the correct ID number. "); } else{System.out.println (codearray[i]+): For the wrong ID number. "); } } SYSTEM.OUT.PRINTLN ("Converted ID number is:" +update2eighteen ("330521820721052")); } }