手機號，身份證號，姓名加*號工具類，你可能用的到

public class ReStrUtils {

    /**
     * 身份證號加*號
     */
    public static String reNo(String realNo) {
        String newNo = "";
        if (realNo.length() == 15){
            newNo = realNo.replaceAll("(\\d{4})\\d{7}(\\d{4})", "$1*******$2");
        }
        if (realNo.length() == 18){
            newNo = realNo.replaceAll("(\\d{4})\\d{10}(\\d{4})", "$1**********$2");
        }
        return newNo;
    }

    /**
     * 名字加*號
     * @param realname
     * @return
     */
    public static String reName(String realname) {
        char[] r = realname.toCharArray();
        String name = "";
        if (r.length == 1){
            name = realname;
        }

        if (r.length == 2){
            name = realname.replaceFirst(realname.substring(1), "*");
        }

        if (r.length > 2){
            name = realname.replaceFirst(realname.substring(1, r.length - 1), "*");

        }
        return name;
    }

    /**
     * 手機號加*號
     * @param realPhone
     * @return
     */
    public static String rePhone(String realPhone) {
        String phoneNumber;
        if (realPhone.length() == 11){
            phoneNumber = realPhone.replaceAll("(\\d{3})\\d{4}(\\d{4})", "$1****$2");
        }else{
            phoneNumber = realPhone;
        }
        return phoneNumber;
    }
}