初始化

lib/core/utils/transfer/download.dart

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+//下载文件
+import 'dart:io';
+
+import 'package:path_provider/path_provider.dart';
+
+class LocalDownload {
+  static Future<String> getLocalFilePath(String url, String path) async {
+    Uri uri = Uri.parse(url);
+    String fileName = uri.pathSegments.last;
+    //获取下载目录
+    Directory dir = await getApplicationCacheDirectory();
+    Directory uploadPath = Directory("${dir.path}$path/");
+    return uploadPath.path + fileName;
+  }
+
+  /// 公用下载方法
+  /// url 下载网络地址
+  /// path 存储地址，如/test
+  /// onProgress 下载回调函数
+  /// onDone 下载完毕回调
+  static downLoadFile({
+    required url,
+    required path,
+    required Function(double) onProgress,
+    required Function(String) onDone,
+  }) async {
+    HttpClient client = HttpClient();
+    Uri uri = Uri.parse(url);
+    //获取本地文件路径
+    String filePath = await getLocalFilePath(url, path);
+    // 发起 get 请求
+    HttpClientRequest request = await client.getUrl(uri);
+    // 响应
+    HttpClientResponse response = await request.close();
+    int contentLength = response.contentLength; // 获取文件总大小
+    int bytesReceived = 0; // 已接收的字节数
+    List<int> chunkList = [];
+    if (response.statusCode == 200) {
+      response.listen(
+        (List<int> chunk) {
+          chunkList.addAll(chunk);
+          bytesReceived += chunk.length; //更新已接受的字节数
+          //进度
+          double progress = bytesReceived * 100 / contentLength * 100;
+          progress = (progress / 100).truncateToDouble();
+          onProgress(progress);
+        },
+        onDone: () async {
+          //下载完毕
+          client.close();
+          File file = File(filePath);
+          if (!file.existsSync()) {
+            file.createSync(recursive: true);
+            await file.writeAsBytes(chunkList);
+          }
+          onDone(file.path);
+        },
+        onError: () {
+          client.close();
+        },
+        cancelOnError: true,
+      );
+    }
+  }
+
+  ///获取本地地址
+  ///
+  static Future<String> getFilePath({
+    required url,
+    required path,
+  }) async {
+    //获取本地文件路径
+    String filePath = await getLocalFilePath(url, path);
+    File file = File(filePath);
+    if (file.existsSync()) {
+      return file.path;
+    } else {
+      return '';
+    }
+  }
+}

lib/core/utils/transfer/file_type.dart

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+enum FileType {
+  image,
+  pdf,
+  other,
+}
+
+class FileMeta {
+  final String name; // 不含后缀
+  final String extension; // 不含点
+  final FileType type;
+
+  const FileMeta({
+    required this.name,
+    required this.extension,
+    required this.type,
+  });
+}
+
+FileMeta parseFileMeta(String path) {
+  final uri = Uri.parse(path);
+  final fileName = uri.pathSegments.isNotEmpty ? uri.pathSegments.last : '';
+
+  if (!fileName.contains('.')) {
+    return const FileMeta(
+      name: '',
+      extension: '',
+      type: FileType.other,
+    );
+  }
+
+  final index = fileName.lastIndexOf('.');
+  final name = fileName.substring(0, index);
+  final ext = fileName.substring(index + 1).toLowerCase();
+
+  final type = switch (ext) {
+    'jpg' || 'jpeg' || 'png' || 'webp' || 'gif' => FileType.image,
+    'pdf' => FileType.pdf,
+    _ => FileType.other,
+  };
+
+  return FileMeta(
+    name: name,
+    extension: ext,
+    type: type,
+  );
+}

lib/core/utils/transfer/select_file.dart

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+import 'dart:io';
+import 'package:file_picker/file_picker.dart';
+import 'package:flutter_easyloading/flutter_easyloading.dart';
+import 'package:flutter_image_compress/flutter_image_compress.dart';
+import 'package:path_provider/path_provider.dart';
+import 'package:path/path.dart' as p;
+
+/// 选择文件
+/// - [type] 文件类型
+/// - [allowedExtensions] 允许的扩展名
+/// - [maxSize] 最大文件大小
+Future<List<File>> selectFile({
+  required FileType type,
+  List<String>? allowedExtensions,
+  int maxSize = 1024 * 1024 * 20,
+}) async {
+  List<File> files = [];
+  bool hasOversize = false;
+
+  FilePickerResult? result = await FilePicker.platform.pickFiles(
+    type: type,
+    allowedExtensions: allowedExtensions,
+  );
+  // 判断空
+  if (result == null) return [];
+
+  //进行文件大小，压缩、等操作
+  for (final e in result.files) {
+    if (e.size > maxSize) {
+      hasOversize = true;
+      continue;
+    }
+    if (e.path == null) continue;
+
+    if (type == FileType.image) {
+      final compressed = await compressImage(File(e.path!));
+      files.add(compressed);
+    } else {
+      files.add(File(e.path!));
+    }
+  }
+  //提示
+  if (hasOversize) {
+    EasyLoading.showInfo('已过滤超过 20MB 的文件');
+  }
+  return files;
+}
+
+/// 压缩图片
+Future<File> compressImage(File file) async {
+  final dir = await getTemporaryDirectory();
+  final targetPath = p.join(
+    dir.path,
+    '${DateTime.now().millisecondsSinceEpoch}.jpg',
+  );
+
+  final result = await FlutterImageCompress.compressAndGetFile(
+    file.absolute.path,
+    targetPath,
+    quality: 80,
+    format: CompressFormat.jpeg,
+    minWidth: 1080,
+    minHeight: 1080,
+  );
+
+  if (result == null) {
+    throw Exception('Image compression failed');
+  }
+  return File(result.path);
+}

lib/core/utils/transfer/upload.dart

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+import 'dart:io';
+import 'package:app/data/api/common_api.dart';
+import 'package:app/data/models/common/qiu_token_dto.dart';
+import 'package:crypto/crypto.dart';
+import 'package:dio/dio.dart';
+import 'package:flutter_easyloading/flutter_easyloading.dart';
+
+import '../../config/global.dart';
+
+class QinUpload {
+  ///获取七牛token
+  static Future<QiuTokenDto> _getQiuToken(File file, String path) async {
+    // 读取文件的字节数据
+    final fileBytes = await file.readAsBytes();
+    String fileMd5 = md5.convert(fileBytes).toString();
+    //前缀
+    var prefix = Config.getEnv() == "dev" ? "test" : "release";
+    var suffix = file.path.split(".").last;
+
+    var res = await getQiuTokenApi(
+      "shangyiapp/$prefix/$path/$fileMd5.$suffix",
+    );
+    return res;
+  }
+
+  ///上传文件
+  /// - [file] 文件
+  /// - [path] 目标目录,不以/开头和结尾
+  static Future<String?> upload({
+    required File file,
+    required String path,
+
+  }) async {
+    var qiuToken = await _getQiuToken(file, path);
+    //数据
+    FormData formData = FormData.fromMap({
+      "file": await MultipartFile.fromFile(file.path),
+      "token": qiuToken.upToken,
+      "fname": qiuToken.fileKey,
+      "key": qiuToken.fileKey,
+    });
+    try {
+      Dio dio = Dio();
+      Response response = await dio.post(
+        qiuToken.uploadUrl!,
+        data: formData,
+        onSendProgress: (int sent, int total) {
+          // double progress = sent * 100 / total * 100;
+          // progress = (progress / 100).truncateToDouble();
+        },
+      );
+      String key = response.data['key'];
+      return "https://${qiuToken.domain}/$key";
+    } catch (e) {
+      EasyLoading.showError("上传失败");
+      return null;
+    }
+  }
+}