uploadFile

@Controller
public class UploadFileController {
    UploadFileService service;

    public UploadFileController(UploadFileService service) {
        this.service = service;
    }

    public static String uploadDirectory = System.getProperty("user.dir")+"/uploads";
    @RequestMapping("/")
    public String UploadPage(Model model) {
        return "uploadview";
    }
    @RequestMapping("/upload")
    public String upload(Model model,@RequestParam("files") MultipartFile[] files) {
        StringBuilder fileNames = new StringBuilder();
        for (MultipartFile file : files) {
            Path fileNameAndPath = Paths.get(uploadDirectory, file.getName());
            fileNames.append(file.getName()+" ");
            try {
                service.saveFile(fileNameAndPath, file.getBytes());
                //Files.write(fileNameAndPath, file.getBytes());
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        model.addAttribute("msg", "Successfully uploaded files "+fileNames.toString());
        return "uploadstatusview";
    }
}
@Service
public class UploadFileService {
    MongoClientURI uri = new MongoClientURI("mongodb://localhost:27017");
    MongoClient mongoClient = new MongoClient(uri);
    MongoDatabase database = mongoClient.getDatabase("test");
    MongoCollection collection = database.getCollection("schedule_uploadfile");

    UploadFileRepository uploadFileRepository;

    public UploadFileService(UploadFileRepository uploadFileRepository) {
        this.uploadFileRepository = uploadFileRepository;
    }

    public void saveFile(Path fileNameAndPath, byte[] bytes) throws IOException {
        Reader reader = Files.newBufferedReader(Paths.get("C:\\Users\\Pepe\\Desktop\\kopiagrafiku.csv")); //dopóki tego nie zmienie
                                                                                               //blad nie występuje i zapisuje do bazy
        CSVParser csvParser = new CSVParser(reader, CSVFormat.newFormat(';'));

        for (CSVRecord record : csvParser) {
            Document grafik = new Document("date", "23.09.2019");
            grafik.append("rodzaj_rozkladu", "powszedni");
            grafik.append("grafik_dzienny", new Document()
                    .append("workNumber", record.get(0))
                    .append("busLine", record.get(1))
                    .append("startTime", record.get(2))
                    .append("endTime", record.get(3)));
            if (record.get(0).isEmpty())
                continue;

            collection.insertOne(grafik);
        }
    }
}

widok
<body>
<form action="/upload" method="post" enctype="multipart/form-data">
    <input type="file" name="files" multiple>
<input type="date" id="date" name="date">
    <input type="submit" value="Zapisz Grafik">
</form>
</body>