给身份证打码

为身份证打码
 1 package com.example.test;
 2 
 3 import org.springframework.util.StringUtils;
 4 
 5 public class IdCardTest {
 6     public static void main(String[] args) {
 7         //身份证号
 8         String id ="22070219961005081x";
 9         //开始的结束长度
10         int start = 6;
11         //结束截取长度
12         int end =4;
13         //打码长度的方法
14         String idNewNum = cardMask(id, start, end);
15         System.out.println(idNewNum);
16     }
17     public static String cardMask(String idNum,int start,int end){
18         if (StringUtils.isEmpty(idNum)){
19             return "身份证号不能为空";
20         }
21         if(start + end > idNum.length()){
22             return "截取长度不能大于身份证的长度";
23         }
24         if (start <0 || end <0){
25             return "请定义开始显示数目及结束显示位数";
26         }
27         //打码*号的数量
28         int x = idNum.length() -start - end;
29         StringBuffer idNewNum = new StringBuffer();
30         for (int i = 0; i <x ; i++) {
31             idNewNum.append("*");
32         }
33         String regex = "(\w{" + String.valueOf(start) + "})(\w+)(\w{" + String.valueOf(end) + "})";
34         return idNum.replaceAll(regex,"$1" + idNewNum + "$3");
35     }
36 }
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