code: public String getConfPathXmlFile(String filePathName){
       int i = filePathName.lastIndexOf(".xml");
       String name = filePathName.substring(0, i);
       name = name.replace('.', '/');
       name += ".xml";
       return getConfFile(name);
    }
docs: com.jdon.sample.xxx.xml ==>
  com/jdon/sample/xxx.xml
  @param filePathName
  @return filename's string