String agent = request.getHeader("USER-AGENT").toLowerCase();

   response.setContentType("application/vnd.ms-excel");

   String fileName = "文件名";

   String codedFileName = java.net.URLEncoder.encode(fileName, "UTF-8");

   if (agent.contains("firefox")) {

           response.setCharacterEncoding("utf-8");

           response.setHeader("content-disposition", "attachment;filename=" + new String(fileName.getBytes(), "ISO8859-1") + ".xls" );

  } else {

          response.setHeader("content-disposition", "attachment;filename=" + codedFileName + ".xls");

   }