Spring resumable.js integration

RestController.java

class RestController {    
    
    @RequestMapping(value = "/api/upload",
            consumes = {"multipart/form-data"},
            method = RequestMethod.POST
    )
    public ResponseEntity<Void> uploadScreenshotApi(
            @RequestParam("file") MultipartFile file,
            @RequestParam("resumableFilename") String resumableFilename,
            @RequestParam("resumableChunkSize") long resumableChunkSize,
            @RequestParam("resumableChunkNumber") int resumableChunkNumber,
            @RequestParam("resumableTotalChunks") int resumableTotalChunks
    ) throws IOException, InterruptedException {
        Path tempFile = Paths.get("screenshots", resumableFilename + ".tmp");
        ByteBuffer out = ByteBuffer.wrap(file.getBytes());
        try (FileChannel channel = FileChannel.open(tempFile, WRITE, CREATE)) {
            channel.position((resumableChunkNumber - 1) * resumableChunkSize);
            while (out.hasRemaining()) {
                channel.write(out);
            }
        }
        if (resumableTotalChunks == resumableChunkNumber) {
            LOGGER.info("finished");
            Files.move(tempFile, Paths.get("screenshots", resumableFilename), REPLACE_EXISTING);
        } else {
            LOGGER.info("continue {} {}", resumableTotalChunks, resumableChunkNumber);
        }
        return toResponse();
    }
}