@RequestMapping("/download")
public void download(HttpServletRequest request, HttpServletResponse response,Model model){

    Params params = getParams();
    String fileAddress=params.getString("fileAddress");
    String fileName=params.getString("fileName");
    String realPath = fileAddress+fileName;
    File file = new File(realPath);
    OutputStream os = null;
    try {
        os = response.getOutputStream();
        response.reset();
        if(request.getHeader("USER-AGENT").toLowerCase().indexOf("firefox") >= 0){
            fileName =  new String(fileName.getBytes("UTF-8"),"iso-8859-1");
        }else{
            fileName= URLEncoder.encode(fileName, "UTF-8").replace("+", "%20");
        }
        response.setHeader("Content-Disposition", "attachment; filename=" + fileName);
        response.setContentType("application/octet-stream");
        os.write(FileUtils.readFileToByteArray(file));
        os.flush();
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        if (os != null) {
            try {
                os.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}