身份证校验

 1 public class Id18 {
 2     int[] weight = { 7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2 }; // 十七位数字本体码权重
 3     char[] validate = { '1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2' }; // mod11,对应校验码字符值
 4 
 5     public char getValidateCode(String id17) {
 6         int sum = 0;
 7         int mode = 0;
 8         for (int i = 0; i < id17.length(); i++) {
 9             sum = sum + Integer.parseInt(String.valueOf(id17.charAt(i))) * weight[i];
10         }
11         mode = sum % 11;
12         return validate[mode];
13     }
14 
15     public static void main(String[] args) {
16         Id18 test = new Id18();
17         System.out.println("该身份证验证码：" + test.getValidateCode("23092119970215128")); // 该身份证校验码：X
18     }
19 }