有一个文件夹下有很多的文件，每一个文件上都有年月日时，现在要根据这个年月日时创建文件夹，并且将这些文件迁移到对应的文件夹下，如何处理

public static void main(String[] args) {
        //File file = new File("D:\\059\\data\\RAIN_GRIB");
        String folderPath = "D:\\source"; // 文件夹路径
        File folder = new File(folderPath);
        File[] files = folder.listFiles();

        if (files != null) {
            for (File file : files) {
                if (file.isFile() && file.getName().endsWith(".tar.gz")) {
                    String fileName = file.getName();
                    String[] parts = file.getName().split("\\.");
                    String datePart = parts[0].substring(parts[0].lastIndexOf("_") + 1);
                    if (parts.length == 2) {

                        //String dateStr = parts[1].substring(0, parts[1].lastIndexOf("."));
                        SimpleDateFormat format = new SimpleDateFormat("yyyyMMddHH");
                        try {
                            Date date = format.parse(datePart);
                            String newFolderPath = folderPath + File.separator + datePart;
                            File newFolder = new File(newFolderPath);
                            if (!newFolder.exists()) {
                                newFolder.mkdir();
                            }
                            Path source = file.toPath();
                            Path destination = newFolder.toPath().resolve(fileName);
                            Files.move(source, destination, StandardCopyOption.REPLACE_EXISTING);
                            System.out.println("Moved file: " + fileName + " to folder: " + newFolderPath);
                        } catch (ParseException | IOException e) {
                            e.printStackTrace();
                        }
                    }
                }
            }
        }
    }