private static String fromContentDisposition ( final String field )
{
    if ( field == null || field.isEmpty () )
    {
        return null;
    }

    try
    {
        final ContentDisposition cd = new ContentDisposition ( field );
        return cd.getParameter ( "filename" );
    }
    catch ( final ParseException e )
    {
        return null;
    }
}
 

private static void addAttachment(BodyPart bp, EMail email)
		throws UnsupportedEncodingException, MessagingException {
	// Skip part without a filename
	if (StringUtils.isEmpty(bp.getFileName()))
		return;

	// Skip part that is not an attachment
	String[] values = bp.getHeader("Content-Disposition");
	String disposition = "";
	if (values != null && values.length > 0)
		disposition = new ContentDisposition(values[0]).getDisposition();
	if (!disposition.contains("attachment"))
		return;

	String name = MimeUtility.decodeText(bp.getFileName());
	String fileName = FilenameUtils.getName(name);

	EMailAttachment attachment = new EMailAttachment();
	attachment.setFileName(fileName);
	attachment.setMimeType(bp.getContentType());
	attachment.setSize(bp.getSize());

	try (InputStream is = bp.getInputStream()) {
		byte[] bytes = IOUtils.toByteArray(is);
		attachment.setData(bytes);
		attachment.setSize(bytes.length);
	} catch (IOException e) {
		log.error(e.getMessage(), e);
	}
	email.addAttachment(attachment);
}
 

public String extractPayloadFilename() throws ParseException {
    String s = getContentDisposition();
    if (s == null || s.length() < 1) {
        return null;
    }
    // TODO: This should be a case insensitive lookup per RFC6266
    String tmpFilename = null;

    ContentDisposition cd = new ContentDisposition(s);
    tmpFilename = cd.getParameter("filename");

    if (tmpFilename == null || tmpFilename.length() < 1) {
        /* Try to extract manually */
        int n = s.indexOf("filename=");
        if (n > -1) {
            tmpFilename = s.substring(n);
            tmpFilename = tmpFilename.replaceFirst("filename=", "");

            int n1 = tmpFilename.indexOf(",");
            if (n1 > -1) {
                s = s.substring(0, n1 - 1);
            }
            tmpFilename = tmpFilename.replaceAll("\"", "");
            s = s.trim();
        } else {
            /* Try just using file separator */
            int pos = s.lastIndexOf(File.separator);
            if (pos >= 0) {
                tmpFilename = s.substring(pos + 1);
            }
        }
    }
    return tmpFilename;
}
 

/**
 * Extract the form name from the Content-Disposition in a
 * multipart/form-data request.
 */
public static String getFieldName(BodyPart part) throws MessagingException {
  String[] values = part.getHeader("Content-Disposition");
  String name = null;
  if (values != null && values.length > 0) {
    name = new ContentDisposition(values[0]).getParameter("name");
  }
  return (name != null) ? name : "unknown";
}