信息脱敏处理：将信息用*号代替

  String num = "13520096531";
  String s1 = StringUtils.right(num, 4);
  System.out.println(s1);
  String s2 = StringUtils.leftPad(s1, StringUtils.length(num), "*");
  System.out.println(s2);
  String s3 = StringUtils.removeStart(s2,"***");
  System.out.println(s3);
  String s4 = StringUtils.left(num, 3).concat(s3);
  System.out.println(s4);
  //System.out.println(StringUtils.left(num, 3).concat(StringUtils.removeStart(StringUtils.leftPad(StringUtils.right(num, 4), StringUtils.length(num), "*"), "***")));
  
  String num1 = "13520096531";
  String d1 = StringUtils.right(num1, 4);
  String d2 = StringUtils.center(d1, 11, "*");
  System.out.println(d2);

6531
*******6531
****6531
135****6531
***6531****