Flutter 本地文件操作

// 缓存接口数据
Future<dynamic> writeCache(type, data) async {// 获取路径var _filePath = await getFilePath(type);File _file = new File('$path/appointment');await _file.writeAsStringSync(data.toString());return;
}// 从文件中读取数据
Future<String> readCache(fileName) async {// 数据缓存文件夹路径String _filePath = await getFilePath('storage');try {File _file = File('$_filePath/$fileName');// Read the fileString contents = await _file.readAsStringSync();return contents;} catch (e) {print('error: $e');return '';}
}// 获取app临时文件路径
Future getFilePath(type) async{var filepath = await getApplicationDocumentsDirectory(); // App内部file:data.com.nufang.zao/app-flutter/// var filepath = await getTemporaryDirectory();        // App内部file:data.com.nufang.zao/ache/// var filepath = await getExternalStorageDirectory();  // App内部file:data.com.nufang.zao/file/var file = Directory(filepath.path + '/$type');try {bool exists = await file.exists();if (!exists) {await file.create();}} catch (e) {print(e);}return file.path;
}