/**
      * 模板下载时的文件名如果是中文，需要转码
      * 
      * @param request
      * @param oldFileName
      * @return
      * @throws UnsupportedEncodingException
      */
     public static String encodeFileName(HttpServletRequest request,
       String oldFileName)
       throws Exception {
      String userAgent = request.getHeader("User-Agent").toUpperCase();
      if (userAgent.indexOf("MSIE") > -1 || userAgent.indexOf("TRIDENT") > -1
        || userAgent.indexOf("EDGE") > -1) {// ie情况处理
       oldFileName = URLEncoder.encode(oldFileName, "UTF-8");
       // 这里的编码后，空格会被解析成+，需要重新处理
       oldFileName = oldFileName.replace("+", "%20");
      } else {
       oldFileName = new String(oldFileName.getBytes("UTF-8"),
         "ISO8859-1");
      }
      return oldFileName;
     }