前言
在日常开发工作中,我们经常需要在不同的网络环境下切换系统代理设置。传统的做法是通过Windows系统设置手动修改,操作繁琐且容易出错。本文将详细介绍如何使用Flutter开发一个Windows桌面应用,实现快速切换系统代理的功能。

项目概述
这个代理切换工具具有以下特点:
- 🖥️ Windows原生桌面应用
- 🔄 一键开启/关闭系统代理
- 💾 自动保存代理配置
- 🔍 实时检测当前代理状态
- ✅ 代理地址格式验证
- 🎨 Material Design 3 UI设计
技术栈选择
核心技术
- Flutter: 跨平台UI框架,支持桌面应用开发
- Dart: Flutter的编程语言
- Windows Registry: 通过注册表操作系统代理设置
主要依赖包
yaml
dependencies:
flutter:
sdk: flutter
cupertino_icons: ^1.0.8
win32: ^5.0.0 # Windows API调用
ffi: ^2.1.0 # 外部函数接口
window_size: # 窗口大小控制
git:
url: https://github.com/google/flutter-desktop-embedding.git
path: plugins/window_size
path_provider: ^2.1.2 # 文件路径获取
完整代码实现
pubspec.yaml配置文件
yaml
name: proxy_switch
description: "Windows系统代理切换工具"
publish_to: 'none'
version: 1.0.0+1
environment:
sdk: ^3.5.3
dependencies:
flutter:
sdk: flutter
cupertino_icons: ^1.0.8
win32: ^5.0.0
ffi: ^2.1.0
window_size:
git:
url: https://github.com/google/flutter-desktop-embedding.git
path: plugins/window_size
path_provider: ^2.1.2
dev_dependencies:
flutter_test:
sdk: flutter
flutter_lints: ^4.0.0
flutter:
uses-material-design: true
主程序代码
dart
import 'dart:io';
import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:window_size/window_size.dart';
void main() {
WidgetsFlutterBinding.ensureInitialized();
if (Platform.isWindows) {
setWindowTitle('系统代理设置');
setWindowMinSize(const Size(640, 480));
setWindowMaxSize(const Size(960, 640));
}
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({super.key});
@override
Widget build(BuildContext context) {
return MaterialApp(
title: '系统代理设置',
theme: ThemeData(
primarySwatch: Colors.blue,
useMaterial3: true,
fontFamily: 'Microsoft YaHei',
textTheme: const TextTheme(
displayLarge: TextStyle(fontFamily: 'Microsoft YaHei'),
displayMedium: TextStyle(fontFamily: 'Microsoft YaHei'),
displaySmall: TextStyle(fontFamily: 'Microsoft YaHei'),
headlineLarge: TextStyle(fontFamily: 'Microsoft YaHei'),
headlineMedium: TextStyle(fontFamily: 'Microsoft YaHei'),
headlineSmall: TextStyle(fontFamily: 'Microsoft YaHei'),
titleLarge: TextStyle(fontFamily: 'Microsoft YaHei'),
titleMedium: TextStyle(fontFamily: 'Microsoft YaHei'),
titleSmall: TextStyle(fontFamily: 'Microsoft YaHei'),
bodyLarge: TextStyle(fontFamily: 'Microsoft YaHei'),
bodyMedium: TextStyle(fontFamily: 'Microsoft YaHei'),
bodySmall: TextStyle(fontFamily: 'Microsoft YaHei'),
labelLarge: TextStyle(fontFamily: 'Microsoft YaHei'),
labelMedium: TextStyle(fontFamily: 'Microsoft YaHei'),
labelSmall: TextStyle(fontFamily: 'Microsoft YaHei'),
),
),
home: const ProxySettingsPage(),
);
}
}
class ProxySettingsPage extends StatefulWidget {
const ProxySettingsPage({super.key});
@override
State<ProxySettingsPage> createState() => _ProxySettingsPageState();
}
class _ProxySettingsPageState extends State<ProxySettingsPage> {
final TextEditingController _proxyController = TextEditingController();
bool _isProxyEnabled = false;
String? _proxyError;
late final File _configFile;
@override
void initState() {
super.initState();
_initializeConfig().then((_) {
_checkCurrentProxyStatus();
if (_proxyController.text.isEmpty) {
_loadConfig();
}
});
}
Future<void> _initializeConfig() async {
final exePath = Platform.resolvedExecutable;
final exeDir = Directory(File(exePath).parent.path);
_configFile = File('${exeDir.path}\\proxy_config.json');
if (!await _configFile.exists()) {
await _configFile.create(recursive: true);
await _saveConfig({'proxyAddress': ''});
}
}
Future<void> _loadConfig() async {
try {
if (await _configFile.exists()) {
final contents = await _configFile.readAsString();
if (contents.isNotEmpty) {
final config = json.decode(contents) as Map<String, dynamic>;
setState(() {
_proxyController.text = config['proxyAddress'] as String? ?? '';
});
}
}
} catch (e) {
debugPrint('加载配置文件失败: $e');
}
}
Future<void> _saveConfig(Map<String, dynamic> config) async {
try {
await _configFile.writeAsString(json.encode(config));
} catch (e) {
debugPrint('保存配置文件失败: $e');
}
}
void _checkCurrentProxyStatus() {
try {
// 从注册表读取当前代理状态
final result = Process.runSync('reg', [
'query',
'HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings',
'/v',
'ProxyEnable'
]);
if (result.exitCode == 0) {
// 解析注册表输出
final output = result.stdout.toString();
final isEnabled = output.contains('0x1');
// 如果代理已启用,读取代理地址
if (isEnabled) {
final proxyResult = Process.runSync('reg', [
'query',
'HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings',
'/v',
'ProxyServer'
]);
if (proxyResult.exitCode == 0) {
final proxyOutput = proxyResult.stdout.toString();
final proxyAddress = proxyOutput.split('REG_SZ')[1].trim();
// 如果获取到有效的代理地址,更新状态并保存到配置文件
if (proxyAddress.isNotEmpty) {
setState(() {
_proxyController.text = proxyAddress;
_isProxyEnabled = true;
});
// 同时更新配置文件
_saveConfig({'proxyAddress': proxyAddress});
return;
}
}
}
setState(() {
_isProxyEnabled = isEnabled;
});
}
} catch (e) {
debugPrint('检查代理状态时出错: $e');
}
}
bool _validateProxyAddress(String address) {
if (address.isEmpty) {
setState(() {
_proxyError = '代理地址不能为空';
});
return false;
}
// 检查格式:IP:端口 或 域名:端口
final RegExp ipRegex = RegExp(
r'^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?):\d{1,5}$'
);
final RegExp domainRegex = RegExp(
r'^([a-zA-Z0-9]([a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,}:\d{1,5}$'
);
if (!ipRegex.hasMatch(address) && !domainRegex.hasMatch(address)) {
setState(() {
_proxyError = '代理地址格式无效,应为 IP:端口 或 域名:端口';
});
return false;
}
// 检查端口范围
final port = int.parse(address.split(':').last);
if (port < 1 || port > 65535) {
setState(() {
_proxyError = '端口号必须在 1-65535 之间';
});
return false;
}
setState(() {
_proxyError = null;
});
return true;
}
void _toggleProxy(bool value) {
if (value && !_validateProxyAddress(_proxyController.text)) {
return;
}
setState(() {
_isProxyEnabled = value;
});
if (value) {
_setWindowsProxy(_proxyController.text);
// 保存新的代理地址到配置文件
_saveConfig({'proxyAddress': _proxyController.text});
} else {
_clearWindowsProxy();
}
}
void _setWindowsProxy(String proxyAddress) {
// 设置系统代理
final cmdProcess = Process.runSync('reg', [
'add',
'HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings',
'/v',
'ProxyEnable',
'/t',
'REG_DWORD',
'/d',
'1',
'/f'
]);
if (cmdProcess.exitCode == 0) {
Process.runSync('reg', [
'add',
'HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings',
'/v',
'ProxyServer',
'/t',
'REG_SZ',
'/d',
proxyAddress,
'/f'
]);
}
}
void _clearWindowsProxy() {
Process.runSync('reg', [
'add',
'HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings',
'/v',
'ProxyEnable',
'/t',
'REG_DWORD',
'/d',
'0',
'/f'
]);
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
backgroundColor: Theme.of(context).colorScheme.inversePrimary,
title: const Text('系统代理设置'),
centerTitle: true,
actions: [
IconButton(
icon: const Icon(Icons.refresh),
onPressed: () {
_checkCurrentProxyStatus();
ScaffoldMessenger.of(context).showSnackBar(
const SnackBar(content: Text('代理状态已刷新')),
);
},
tooltip: '刷新代理状态',
),
],
),
body: Container(
padding: const EdgeInsets.all(20.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: [
Card(
elevation: 2,
child: Padding(
padding: const EdgeInsets.all(16.0),
child: Column(
children: [
Row(
children: [
Expanded(
child: TextField(
controller: _proxyController,
decoration: InputDecoration(
labelText: '代理地址',
hintText: '例如: 127.0.0.1:7890',
errorText: _proxyError,
border: OutlineInputBorder(
borderRadius: BorderRadius.circular(8),
),
prefixIcon: const Icon(Icons.computer),
),
onChanged: (value) {
if (_proxyError != null) {
setState(() {
_proxyError = null;
});
}
},
),
),
const SizedBox(width: 8),
IconButton(
icon: const Icon(Icons.save),
onPressed: () {
if (_validateProxyAddress(_proxyController.text)) {
_saveConfig({'proxyAddress': _proxyController.text});
// 如果当前代理是启用状态,则更新系统代理地址
if (_isProxyEnabled) {
_setWindowsProxy(_proxyController.text);
}
ScaffoldMessenger.of(context).showSnackBar(
const SnackBar(content: Text('代理地址已保存')),
);
}
},
tooltip: '保存代理地址',
),
],
),
const SizedBox(height: 20),
Container(
padding: const EdgeInsets.symmetric(
horizontal: 16,
vertical: 8,
),
decoration: BoxDecoration(
color: Theme.of(context).colorScheme.surfaceContainerHighest,
borderRadius: BorderRadius.circular(8),
),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: [
Row(
children: [
Icon(
_isProxyEnabled
? Icons.cloud_done
: Icons.cloud_off,
color: _isProxyEnabled
? Colors.green
: Colors.grey,
),
const SizedBox(width: 8),
const Text(
'启用系统代理',
style: TextStyle(
fontSize: 16,
fontWeight: FontWeight.w500,
),
),
],
),
Switch(
value: _isProxyEnabled,
onChanged: _toggleProxy,
),
],
),
),
],
),
),
),
],
),
),
);
}
@override
void dispose() {
_proxyController.dispose();
super.dispose();
}
}
核心功能解析
1. 窗口配置与初始化
应用启动时,我们首先配置了窗口的基本属性:
dart
void main() {
WidgetsFlutterBinding.ensureInitialized();
if (Platform.isWindows) {
setWindowTitle('系统代理设置');
setWindowMinSize(const Size(640, 480));
setWindowMaxSize(const Size(960, 640));
}
runApp(const MyApp());
}
这里使用了window_size
插件来控制窗口大小,确保应用在Windows平台上有合适的显示尺寸。
2. 配置文件管理
应用需要持久化保存用户的代理配置,我们将配置文件保存在可执行文件同目录下:
dart
Future<void> _initializeConfig() async {
final exePath = Platform.resolvedExecutable;
final exeDir = Directory(File(exePath).parent.path);
_configFile = File('${exeDir.path}\\proxy_config.json');
if (!await _configFile.exists()) {
await _configFile.create(recursive: true);
await _saveConfig({'proxyAddress': ''});
}
}
3. Windows注册表操作
这是整个应用的核心功能,通过操作Windows注册表来控制系统代理:
检查当前代理状态:
dart
void _checkCurrentProxyStatus() {
try {
// 查询ProxyEnable注册表项
final result = Process.runSync('reg', [
'query',
'HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings',
'/v',
'ProxyEnable'
]);
if (result.exitCode == 0) {
final output = result.stdout.toString();
final isEnabled = output.contains('0x1');
// ... 后续处理
}
} catch (e) {
debugPrint('检查代理状态时出错: $e');
}
}
设置系统代理:
dart
void _setWindowsProxy(String proxyAddress) {
// 启用代理
Process.runSync('reg', [
'add',
'HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings',
'/v', 'ProxyEnable',
'/t', 'REG_DWORD',
'/d', '1',
'/f'
]);
// 设置代理服务器地址
Process.runSync('reg', [
'add',
'HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Internet Settings',
'/v', 'ProxyServer',
'/t', 'REG_SZ',
'/d', proxyAddress,
'/f'
]);
}
4. 输入验证
为了确保用户输入的代理地址格式正确,我们实现了完善的验证机制:
dart
bool _validateProxyAddress(String address) {
if (address.isEmpty) {
setState(() {
_proxyError = '代理地址不能为空';
});
return false;
}
// IP地址格式验证
final RegExp ipRegex = RegExp(
r'^((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?):\d{1,5}$'
);
// 域名格式验证
final RegExp domainRegex = RegExp(
r'^([a-zA-Z0-9]([a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])?\.)+[a-zA-Z]{2,}:\d{1,5}$'
);
if (!ipRegex.hasMatch(address) && !domainRegex.hasMatch(address)) {
setState(() {
_proxyError = '代理地址格式无效,应为 IP:端口 或 域名:端口';
});
return false;
}
return true;
}
运行与部署
开发环境要求
- Flutter 3.5.3+
- Windows 10/11
- Visual Studio Code 或 Android Studio
编译打包
bash
# 构建Windows桌面应用
flutter build windows
# 生成的可执行文件位于
# build/windows/x64/runner/Release/proxy_switch.exe
使用说明
- 在代理地址输入框中填入代理服务器地址(如:127.0.0.1:7890)
- 点击保存按钮保存配置
- 使用开关控制代理的启用/禁用
- 点击刷新按钮检查当前系统代理状态
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