package：path_provider

一个能使用本地文件系统的插件，比如获取缓存区域文件夹等。
支持全平台，但是部分功能针对于不同的平台有限制

读取文件
或者文件地址等

功能：

功能：
1.读取文件
2. 或者文件地址等
|Directory |Android | iOS | Linux |macOS |Windows |
Temporary ✔️ ✔️ ✔️ ✔️ ✔️
Application Support ✔️ ✔️ ✔️ ✔️ ✔️
Application Library ❌️ ✔️ ❌️ ✔️ ❌️
Application Documents ✔️ ✔️ ✔️ ✔️ ✔️
External Storage ✔️ ❌ ❌ ❌️ ❌️
External Cache Directories ✔️ ❌ ❌ ❌️ ❌️
External Storage Directories ✔️ ❌ ❌ ❌️ ❌️
Downloads ❌ ❌ ✔️ ✔️ ✔️

使用实例和代码：

 Future<String> _getTemporaryDirectory() async {final dir = await getTemporaryDirectory();return dir.toString();}

 Future<String> _getApplicationSupportDirectory() async {final dir = await getApplicationSupportDirectory();return dir.toString();}

 Future<String> _getLibraryDirectory() async {final dir = await getLibraryDirectory();return dir.toString();}

Future<String> _getApplicationDocumentsDirectory() async {final dir = await getApplicationDocumentsDirectory();return dir.toString();
}

 Future<String> _getExternalStorageDirectory() async {final dir = await getExternalStorageDirectory();return dir.toString();}

 Future<String> _getExternalCacheDirectories() async {final dir = await getExternalCacheDirectories();return dir.toString();}Future<String> _getDownloadsDirectory() async {final dir = await getDownloadsDirectory();return dir.toString();}

获取DocumentsDirectory文件的具体地址，并插件一个txt文件

 /*读写磁盘的操作**///获取到文件Future<File> getFile(String str) async {final dir = await getApplicationDocumentsDirectory();debugPrint('$dir'.toString());String filepath = "${dir.path}\\${str}.txt";debugPrint("filepath $filepath");// Directory newdirectory = Directory(filepath);//文件夹也可以创建File file = File(filepath);if (!file.existsSync()) {//判断是否存在文件，如果不存在就创建他,异步创建file.createSync();debugPrint('create success');}return File(filepath);}

读取文件并写入，mode: FileMode.append不覆盖

 Future<void> dowritestr(String str) async {final file = await getFile("test");//append 不覆盖添加file.writeAsStringSync('JACK', mode: FileMode.append);file.writeAsStringSync('TOm', mode: FileMode.append);debugPrint('success');}

获取文件并读取

 Future<String> doread(String str) async {final file = await getFile("test");//append 不覆盖添加debugPrint('success');return file.readAsString();}

代码：

// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.// ignore_for_file: public_member_api_docsimport 'dart:io';import 'package:flutter/material.dart';
import 'package:path_provider/path_provider.dart';void main() {runApp(const MyApp());
}class MyApp extends StatelessWidget {const MyApp({Key? key}) : super(key: key);@overrideWidget build(BuildContext context) {return MaterialApp(title: 'Path Provider',theme: ThemeData(primarySwatch: Colors.blue,),home: const MyHomePage(title: 'Path Provider'),);}
}class MyHomePage extends StatefulWidget {const MyHomePage({Key? key, required this.title}) : super(key: key);final String title;@overrideState<MyHomePage> createState() => _MyHomePageState();
}class _MyHomePageState extends State<MyHomePage> {String addstr = '这边显示文档的位置';Future<String> _getTemporaryDirectory() async {final dir = await getTemporaryDirectory();return dir.toString();}Future<String> _getApplicationSupportDirectory() async {final dir = await getApplicationSupportDirectory();return dir.toString();}Future<String> _getLibraryDirectory() async {final dir = await getLibraryDirectory();return dir.toString();}Future<String> _getApplicationDocumentsDirectory() async {final dir = await getApplicationDocumentsDirectory();return dir.toString();}Future<String> _getExternalStorageDirectory() async {final dir = await getExternalStorageDirectory();return dir.toString();}Future<String> _getExternalCacheDirectories() async {final dir = await getExternalCacheDirectories();return dir.toString();}Future<String> _getDownloadsDirectory() async {final dir = await getDownloadsDirectory();return dir.toString();}/*读写磁盘的操作**///获取到文件Future<File> getFile(String str) async {final dir = await getApplicationDocumentsDirectory();debugPrint('$dir'.toString());String filepath = "${dir.path}\\${str}.txt";debugPrint("filepath $filepath");// Directory newdirectory = Directory(filepath);//文件夹也可以创建File file = File(filepath);if (!file.existsSync()) {//判断是否存在文件，如果不存在就创建他,异步创建file.createSync();debugPrint('create success');}return File(filepath);}Future<void> dowritestr(String str) async {final file = await getFile("test");//append 不覆盖添加file.writeAsStringSync('JACK', mode: FileMode.append);file.writeAsStringSync('TOm', mode: FileMode.append);debugPrint('success');}Future<String> doread(String str) async {final file = await getFile("test");//append 不覆盖添加debugPrint('success');return file.readAsString();}@overrideWidget build(BuildContext context) {return Scaffold(appBar: AppBar(title: Text(widget.title),),body: Center(child: ListView(padding: EdgeInsets.all(10),children: [Center(child: Text(addstr)),Container(margin: EdgeInsets.all(10),child: ElevatedButton(onPressed: () async {String newadd = await _getTemporaryDirectory();setState(() {addstr = newadd;});},child: const Text('获取应用临时目录(全平台支持)getTemporaryDirectory')),),Container(margin: EdgeInsets.all(10),child: ElevatedButton(onPressed: () async {String newadd = await _getApplicationSupportDirectory();setState(() {addstr = newadd;});},child: const Text('获取应用程序支持目录(全平台支持)getApplicationSupportDirectory')),),Container(margin: EdgeInsets.all(10),child: ElevatedButton(onPressed: () async {if (Platform.isMacOS || Platform.isMacOS) {String newadd = await _getLibraryDirectory();addstr = newadd;} else {String newadd = '不支持';addstr = newadd;}setState(() {});},child: const Text('获取程序持久文件目录(ios macos)getLibraryDirectory')),),Container(margin: EdgeInsets.all(10),child: ElevatedButton(onPressed: () async {String newadd = await _getApplicationDocumentsDirectory();addstr = newadd;setState(() {});},child: const Text('获取应用文档目录（全平台）getApplicationDocumentsDirectory')),),Container(margin: EdgeInsets.all(10),child: ElevatedButton(onPressed: () async {if (Platform.isAndroid) {String newadd = await _getExternalStorageDirectory();addstr = newadd;} else {String newadd = '不支持';addstr = newadd;}setState(() {});},child: const Text('获取外部存储目录(only android)getExternalStorageDirectory')),),Container(margin: EdgeInsets.all(10),child: ElevatedButton(onPressed: () async {if (Platform.isAndroid) {String newadd = await _getExternalCacheDirectories();addstr = newadd;} else {String newadd = '不支持';addstr = newadd;}setState(() {});},child: const Text('获取外部缓存目录(only android)getExternalCacheDirectories')),),Container(margin: EdgeInsets.all(10),child: ElevatedButton(onPressed: () async {if (Platform.isAndroid) {String newadd = await _getExternalStorageDirectory();addstr = newadd;} else {String newadd = '不支持';addstr = newadd;}setState(() {});},child: const Text('外部存储目录（单独分区）(only android)getExternalStorageDirectory')),),Container(margin: EdgeInsets.all(10),child: ElevatedButton(onPressed: () async {if (Platform.isLinux ||Platform.isMacOS ||Platform.isWindows) {String newadd = await _getDownloadsDirectory();addstr = newadd;} else {String newadd = '不支持';addstr = newadd;}setState(() {});},child: const Text('获取下载文件存储目录地址(only Linux,MacOS,Windows)getDownloadsDirectory')),),Container(margin: EdgeInsets.all(10),child: ElevatedButton(onPressed: () async {dowritestr('TEST');},child: const Text('写入数据的操作')),),Container(margin: EdgeInsets.all(10),child: ElevatedButton(onPressed: () async {String retxt = await doread('TEST');setState(() {addstr = retxt;});},child: const Text('读取数据')),),],)),);}
}

截图：

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【Flutter】【path_provider】path_provider文件系统

package：path_provider

功能：

使用实例和代码：

获取DocumentsDirectory文件的具体地址，并插件一个txt文件

读取文件并写入，mode: FileMode.append不覆盖

获取文件并读取

代码：

截图：

【Flutter】【path_provider】path_provider文件系统相关推荐

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