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    private String readTextFileToString(String filePath) {
        try (BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(filePath), "windows-1251"))) { // русский текст
            StringBuilder sb = new StringBuilder();
            String line;
            while ((line = reader.readLine()) != null)
                sb.append(line);
            return sb.toString();
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
    }