feat:增加对话框工具类

lib/utils/file_utils.dart

@@ -0,0 +1,50 @@
+import 'dart:io';
+import 'package:crypto/crypto.dart';
+import 'package:flutter_image_compress/flutter_image_compress.dart';
+
+import 'log_utils.dart';
+
+String getFileExtension(String fileName) {
+  if (fileName.contains('.')) {
+    return '.${fileName.split('.').last.toLowerCase()}';
+  }
+  return '';
+}
+
+Future<String> generateMD5HashName(String filePath) async {
+  final file = File(filePath);
+  final bytes = await file.readAsBytes();
+  final hash = md5.convert(bytes);
+  return hash.toString();
+}
+
+// 图片压缩方法
+Future<File> compressImage(File file) async {
+  try {
+    // 获取压缩后的文件路径
+    final result = await FlutterImageCompress.compressAndGetFile(
+      file.absolute.path,
+      '${file.parent.path}/compressed_${DateTime.now().millisecondsSinceEpoch}.jpg',
+      minWidth: 800,
+      minHeight: 600,
+      quality: 70,
+      format: CompressFormat.jpeg,
+    );
+
+    if (result == null) {
+      throw Exception('图片压缩失败');
+    }
+
+    return File(result.path);
+  } catch (e) {
+    logger.e('图片压缩失败，使用原文件: $e');
+    return file;
+  }
+}
+
+// 检查是否为图片文件
+bool isImageFile(String fileName) {
+  final imageExtensions = ['.jpg', '.jpeg', '.png', '.gif', '.bmp', '.webp'];
+  final extension = fileName.toLowerCase().substring(fileName.lastIndexOf('.'));
+  return imageExtensions.contains(extension);
+}