String recommendedName =new String(file.getBytes(), “ISO8859_1”);    response.reset();    response.setContentType(“application/vnd.ms-excel;charset=gb2312”);       response.setHeader("Cache-Control", "no-cache");                              response.setHeader("Pragma", "No-cache");    response.setDateHeader("Expires", 0);    response.setHeader("Content-Disposition","attachment; filename="+ recommendedName +"\"");    response.resetBuffer();    PrintWriter sos = response.getWriter();    sos.print(sb.toString());    sos.flush();    sos.close();