给身份证打码

为身份证打码

package com.example.test;

import org.springframework.util.StringUtils;

public class IdCardTest {
    public static void main(String[] args) {
        //身份证号
        String id ="22070219961005081x";
        //开始的结束长度
        int start = 6;
        //结束截取长度
        int end =4;
        //打码长度的方法
        String idNewNum = cardMask(id, start, end);
        System.out.println(idNewNum);
    }
    public static String cardMask(String idNum,int start,int end){
        if (StringUtils.isEmpty(idNum)){
            return "身份证号不能为空";
        }
        if(start + end > idNum.length()){
            return "截取长度不能大于身份证的长度";
        }
        if (start <0 || end <0){
            return "请定义开始显示数目及结束显示位数";
        }
        //打码*号的数量
        int x = idNum.length() -start - end;
        StringBuffer idNewNum = new StringBuffer();
        for (int i = 0; i <x ; i++) {
            idNewNum.append("*");
        }
        String regex = "(\w{" + String.valueOf(start) + "})(\w+)(\w{" + String.valueOf(end) + "})";
        return idNum.replaceAll(regex,"$1" + idNewNum + "$3");
    }
}