Flutter如何将.txt转换为json？

dependencies:
  flutter:
    sdk: flutter
  path_provider: ^2.0.2
  convert: ^3.0.0

import 'dart:convert';
import 'dart:io';
import 'package:path_provider/path_provider.dart';

Future<String> convertTxtToJson() async {
  // 获取应用的文档目录
  Directory appDocumentsDirectory = await getApplicationDocumentsDirectory();
  String appDocumentsPath = appDocumentsDirectory.path;

  // 读取.txt文件内容
  File txtFile = File('$appDocumentsPath/example.txt');
  String txtContent = await txtFile.readAsString();

  // 将.txt内容转换为json格式
  List<String> lines = txtContent.split('\n');
  Map<String, dynamic> jsonData = {};
  for (String line in lines) {
    List<String> parts = line.split(':');
    if (parts.length == 2) {
      String key = parts[0].trim();
      String value = parts[1].trim();
      jsonData[key] = value;
    }
  }

  // 将json数据转换为字符串
  String jsonString = jsonEncode(jsonData);

  // 返回json字符串
  return jsonString;
}

String jsonStr = await convertTxtToJson();
Map<String, dynamic> jsonData = jsonDecode(jsonStr);
print(jsonData);