FileDownload.java

File file = (File) model.get("downloadFile");
String fileName = (String) model.get("fileName");
 
String header = request.getHeader("User-Agent");

if (header.contains("MSIE") || header.contains("Trident")) {
    fileName = URLEncoder.encode(fileName,"UTF-8").replaceAll("\\+", "%20");
    response.setHeader("Content-Disposition", "attachment;filename=" + fileName + ";");
} else {
    fileName = new String(fileName.getBytes("UTF-8"), "ISO-8859-1");
   response.setHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");
}
 
response.setContentType(getContentType());
response.setContentLength((int) file.length());
response.setHeader("Content-Type", "application/octet-stream");
response.setContentLength((int)file.length());
response.setHeader("Content-Transfer-Encoding", "binary;");
response.setHeader("Pragma", "no-cache;");
response.setHeader("Expires", "-1;");
 
OutputStream out = response.getOutputStream();
FileInputStream fis = null;
try {
    fis = new FileInputStream(file);
    FileCopyUtils.copy(fis, out);
} catch (Exception e) {
    logger.error(e.getMessage());
} finally {
    if (fis != null) {
        try {
            fis.close();
        } catch (Exception e) {
            logger.error(e.getMessage());
        }
    }
}

out.flush();