@Service
public class NewsSourceServiceImpl implements NewsSourceService {
    private final NewsSourceRepository newsSourceRepository;
    private final ThreadPoolTaskScheduler threadPoolTaskScheduler;
    private final CronTrigger cronTrigger;
    public NewsSourceServiceImpl(NewsSourceRepository newsSourceRepository, ThreadPoolTaskScheduler threadPoolTaskScheduler, CronTrigger cronTrigger) {
        this.newsSourceRepository = newsSourceRepository;
        this.threadPoolTaskScheduler = threadPoolTaskScheduler;
        this.cronTrigger = cronTrigger;
    }
    @PostConstruct
    private void statisticalTask() {
        threadPoolTaskScheduler.schedule(new StatisticalTask(), cronTrigger);
    }
    private class StatisticalTask implements Runnable {
        @Override
        public void run() {
            List<Statistics> statisticalTasks = newsSourceRepository.countNewsForStatistics();
            // Here I have to create a txt file and 'statisticalTasks' contents. Then store the files.
        }
    }
}

        String directoryPath = "stats";
        String fileName = "file-name.txt";
        File directory = new File(directoryPath);
        if (!directory.exists()) {
            directory.mkdirs(); // Create the directory if it doesn't exist
        }
        File file = new File(directory, fileName);
        try (Writer writer = new BufferedWriter(new FileWriter(file))) {
            String newLine = System.getProperty("line.separator");
            String contents = "first line"
                    + newLine
                    + "next line";
            writer.write(contents);
        } catch (IOException e) {
            e.printStackTrace();
        }