如何在Flutter中读取和写入文本文件 [英] How to read and write a text file in Flutter

问题描述

您如何从文件读取文本并将文本写入文件？

How do you read text from a file and write text to a file?

我一直在学习如何在文件中读取和写入文本。 。我发现了另一个有关从资产读取的问题，但这并不相同。我将从我从文档中学到的答案添加到下面。

I've been learning about how to read and write text to and from a file. I found another question about reading from assets, but that is not the same. I will add my answer below from what I learned from the documentation.

推荐答案

设置

在 pubspec.yaml 中添加以下插件：

dependencies:
  path_provider: ^0.4.1

将版本号更新为< a href = https://pub.dartlang.org/packages/path_provider rel = noreferrer>当前。

并将其导入到您的

import 'package:path_provider/path_provider.dart';

您还必须导入 dart：io 使用 File 类。

import 'dart:io';

写入文本文件

Writing to a text file

_write(String text) async {
  final Directory directory = await getApplicationDocumentsDirectory();
  final File file = File('${directory.path}/my_file.txt');
  await file.writeAsString(text);
}

从文本文件读取

Reading from a text file

Future<String> _read() async {
  String text;
  try {
    final Directory directory = await getApplicationDocumentsDirectory();
    final File file = File('${directory.path}/my_file.txt');
    text = await file.readAsString();
  } catch (e) {
    print("Couldn't read file");
  }
  return text;
}

注释

• 您还可以使用 join（directory.path，'my_file.txt'）获取路径字符串，但是您需要导入'package：path / path.dart'。


• Flutter的读写文件官方文件



Notes

• You can also get the path string with join(directory.path, 'my_file.txt') but you need to import 'package:path/path.dart'.
• Flutter's Official Documentation of Reading and Writing Files

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