POI excel下载 中文名 浏览器兼容解决

private void downfile(HSSFWorkbook wb,String ua,String fileName,HttpServletResponse response)
throws IOException {
    String agent = ua;//request.getHeader("user-agent");
    if(agent.contains("Firefox")){ // 火狐浏览器
        fileName = "=?UTF-8?B?"+new BASE64Encoder().encode(fileName.getBytes("utf-8"))+"?=";
    }else{ // IE及其他浏览器
        fileName = URLEncoder.encode(fileName,"utf-8");
    }
    response.setHeader("content-disposition", "attachment;filename=" + fileName + ".xls");
    OutputStream fos = response.getOutputStream();
    wb.write(fos);
    fos.close();
}