Java掩码的几种使用例举，Java如何做掩码

 private static String nameMask(String name) throws Exception {
 if(name ==null)throw new Exception("请输入要掩码的字符串");
 if(name.length()<=1) return name+"*";
 return name.replaceAll("([\\u4e00-\\u9fa5]{1})(.*)", "$1"+createAsterisk(name.length()-1));
 }
 private static String createAsterisk(int len) {
 StringBuffer sb = new StringBuffer();
 for(int i=0;i<len;i++){
  sb.append("*");
 }
 return sb.toString();
 }

/**
 * 对客户证件号码做掩码
 * 
 * */
 public static String maskCertId(String certId) throws Exception
 {
 if(certId==null||certId.length()==0) return "";
 if(certId.length()==18)
 {
  String v = certId.substring(0,4);
  String end = certId.substring(certId.length()-4);
  return v+StringUtils.repeat("*",8)+end;
 }
 else
  return "";
 }

/**
 * 对客户姓名做掩码
 * @throws JBOException 
 * */
 public static String maskUserName(String userName) throws Exception
 {
 if(userName==null||userName.length()==0) return "";
 String v = userName.substring(0,1);
 return StringUtils.rightPad(v, userName.length(),"*");//StringUtils.rightPad方法做一个字符串右补齐
 }

/**
 * 对字符串进行脱敏处理
 * @param word 被脱敏的字符
 * @param startLength 被保留的开始长度 0代表不保留
 * @param endLength 被保留的结束长度 0代表不保留
 * @param pad 填充字符
 * */
 public static String wordMask(String word,int startLength ,int endLength,String pad)  {
 if(word==null) return StringUtils.leftPad("", startLength+endLength,pad);
 if(word.length()<=startLength+endLength) return StringUtils.leftPad("", startLength+endLength,pad);
 String startStr = "";
 String endStr = "";
 int padLength = 0;
 if(word.length()>startLength) startStr = StringUtils.substring(word, 0,startLength);
 if(word.length()>startLength+endLength) endStr = StringUtils.substring(word, word.length()-endLength);
 padLength = word.length()-startLength-endLength;
 return startStr + StringUtils.repeat(pad, padLength)+endStr;
 }