private MockHttpServletRequest getMultipartRequest( ) throws Exception
{
    MockHttpServletRequest request = new MockHttpServletRequest( );
    byte [ ] fileContent = new byte [ ] {
            1, 2, 3
    };
    Part [ ] parts = new Part [ ] {
        new FilePart( "file1", new ByteArrayPartSource( "file1", fileContent ) )
    };
    MultipartRequestEntity multipartRequestEntity = new MultipartRequestEntity( parts, new PostMethod( ).getParams( ) );
    // Serialize request body
    ByteArrayOutputStream requestContent = new ByteArrayOutputStream( );
    multipartRequestEntity.writeRequest( requestContent );
    // Set request body to HTTP servlet request
    request.setContent( requestContent.toByteArray( ) );
    // Set content type to HTTP servlet request (important, includes Mime boundary string)
    request.setContentType( multipartRequestEntity.getContentType( ) );
    request.setMethod( "POST" );
    return request;
}
 

private static void addFilePart(final IContext context, String partname,
		final IMendixObject source, List<Part> parts) throws IOException {
	ByteArrayPartSource p = new ByteArrayPartSource(
			getFileDocumentFileName(context, source),
			IOUtils.toByteArray(Core.getFileDocumentContent(context, source)));
	parts.add(new FilePart(partname, p));
}
 

private static Part[] createSendPhotoRequestParts(TelegramBot bot, byte[] image, String imageType, String caption) {
    List<Part> partList = new ArrayList<>();
    partList.add(new StringPart("chat_id", bot.getChatId()));
    partList.add(new FilePart("photo", new ByteArrayPartSource(String.format("image.%s", imageType), image)));

    if (StringUtils.isNotBlank(caption)) {
        partList.add(new StringPart("caption", caption, "UTF-8"));
    }

    if (StringUtils.isNotBlank(bot.getParseMode())) {
        partList.add(new StringPart("parse_mode", bot.getParseMode()));
    }
    return partList.toArray(new Part[0]);
}
 

public void addFile(final int executionId, final String uid, final byte[] bytes, String fileName) throws Exception {
	Part[] parts = new Part[] { new FilePart("file", new ByteArrayPartSource(fileName, bytes))};
	addFile(executionId,uid,parts);
}