身份证15位转18位方法

/** 15位身份证转18位 */
public  String fixPersonIDCode(String personIDCode){
if (personIDCode == null || personIDCode.trim().length() != 15) {
return personIDCode;
}
String id17 = personIDCode.substring(0, 6) + "19"
+ personIDCode.substring(6, 15); // 15为身份证补\'19\'
// char[] code =
// {\'1\',\'0\',\'X\',\'9\',\'8\',\'7\',\'6\',\'5\',\'4\',\'3\',\'2\'};
// //11个
char[] code = { '1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2' }; // 11个
int[] factor = { 0, 2, 4, 8, 5, 10, 9, 7, 3, 6, 1, 2, 4, 8, 5, 10, 9, 7 }; // 18个;
int[] idcd = new int[18];
int i;
int j;
int sum;
int remainder;
for (i = 1; i < 18; i++)
{
j = 17 - i;
idcd[i] = Integer.parseInt(id17.substring(j, j + 1));
}
sum = 0;
for (i = 1; i < 18; i++)
{
sum = sum + idcd[i] * factor[i];
}
remainder = sum % 11;
String lastCheckBit = String.valueOf(code[remainder]);
return id17 + lastCheckBit;

}