code: public static boolean isFileUpdate(String oldName, String newName) {
  
          return isFileEqual(new File(oldName), new File(newName));
      }
docs: 使用jar包：commons-codec-1.4.jar的md5比较方法 <br/>
  http://blog.csdn.net/very365_1208/article/details/8824033
  
  @param oldName
  @param newName
  
  @return