java后台证件号15转18位

最近做一个小项目，涉及到证件号码的校验，虽然目前基本没有15位证件号码，但是项目要求还是需要把15位转18位的问题校验。

原始代码中，有关于15位转18位和18转15位校验的。 本次只涉及15转18位校验。

public class ConvertCard {
	final static int[] wi = {7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2, 1};  
    static int[] vi = {1, 0, 'X', 9, 8, 7, 6, 5, 4, 3, 2};  
    private static int[] ai = new int[18];  
    // 验证15位18位  
    public static boolean Verify(String idcard) {  
        if (idcard.length() == 15) {idcard = uptoeighteen(idcard);   
    }      
    if (idcard.length() != 18)   
    {      return false;     
    }      
    String verify = idcard.substring(17, 18);   
    if (verify.equals(getVerify(idcard)))   
    {       
        return true;     
    }      
    return false;  
    }// 得到最后地位校验码  
    public static String getVerify(String eightcardid) {   
        int remaining = 0;     
        if (eightcardid.length() == 18)   
        {      eightcardid = eightcardid.substring(0, 17);     
        }    if (eightcardid.length() == 17) {      
            int sum = 0;      
            for (int i = 0; i < 17; i++) {   
      String k = eightcardid.substring(i, i + 1);   
      ai[i] = Integer.parseInt(k);       
      }      for (int i = 0; i < 17; i++)   
      {      sum = sum + wi[i] * (ai[i]);  
      }      remaining = sum % 11;     
      }    return remaining == 2 ? "X" : String.valueOf(vi[remaining]);  
      }  
    // 15转18位  
    public static String uptoeighteen(String fifteencardid) {   
        String eightcardid = fifteencardid.substring(0, 6);  
        eightcardid = eightcardid + "19";     
        eightcardid = eightcardid + fifteencardid.substring(6, 15);  
        eightcardid = eightcardid + getVerify(eightcardid);     
        return eightcardid;
    }  
    public static void main(String[] args){ 
        System.out.println(Verify("360829860812171"));  
    }  

}