Implement a configurable java web parameter validators

<validators xmlns="http://www.example.net/test" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.example.net/test validateParam.xsd"><servletValidator servletUrl="/RecordLogInInfo"><validator validatorClass="com.validator.RegexValidator" pattern="[0-9]+"><validateParam name="userid" errorCode="0104102" /></validator><validator validatorClass="com.validator.NullValidator"><validateParam name="userid" errorCode="0104101" /><validateParam name="phoneos" errorCode="0104103" /><validateParam name="devicename" errorCode="0104104" /></validator></servletValidator></validators>

　　

　

A string separated. How many authentication methods are available?

   Map<String, String> paramsMap =   List<String> validate(HttpServletRequest req) =  (String paramName :    isError(String paramString) 

And implement

  RegexValidator  String pattern=  isError(String content)  StringUtil.isNotNull(content)&&! .pattern =