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lib/common/util/DailyLogUtils.dart

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+import 'dart:io';
+import 'package:path_provider/path_provider.dart';
+import 'package:intl/intl.dart';
+
+class DailyLogUtils {
+  // 获取日志文件路径（按日期命名）
+  static Future<File> _getLogFile() async {
+    final dir = await getApplicationDocumentsDirectory();
+    final date = DateFormat('yyyy-MM-dd').format(DateTime.now());
+    final filePath = '${dir.path}/$date.log';
+    final file = File(filePath);
+    if (!await file.exists()) {
+      await file.create(recursive: true);
+    }
+    return file;
+  }
+
+  // 写入日志核心方法，带日志等级
+  static Future<void> _writeLogWithLevel(String level, String content) async {
+    final file = await _getLogFile();
+    final now = DateTime.now();
+    final time = DateFormat('HH:mm:ss').format(now);
+    final logLine = '[$time][$level] $content\n';
+    await file.writeAsString(logLine, mode: FileMode.append);
+  }
+
+  // 写入 info 日志（原 writeLog 保留）
+  static Future<void> writeLog(String content) async {
+    await _writeLogWithLevel('INFO', content);
+  }
+
+  // 写入 warning 日志
+  static Future<void> writeWarning(String content) async {
+    await _writeLogWithLevel('WARNING', content);
+  }
+
+  // 写入 error 日志
+  static Future<void> writeError(String content) async {
+    await _writeLogWithLevel('ERROR', content);
+  }
+
+  // 写入 debug 日志
+  static Future<void> writeDebug(String content) async {
+    await _writeLogWithLevel('DEBUG', content);
+  }
+
+  // 读取当天日志
+  static Future<String> readTodayLog() async {
+    final file = await _getLogFile();
+    return await file.readAsString();
+  }
+
+  // 获取所有日志文件（返回 File 列表）
+  static Future<List<FileSystemEntity>> listLogFiles() async {
+    final dir = await getApplicationDocumentsDirectory();
+    final files = dir.listSync();
+    return files.where((f) => f.path.endsWith('.log')).toList();
+  }
+
+  // 清除所有日志
+  static Future<void> clearAllLogs() async {
+    final files = await listLogFiles();
+    for (final f in files) {
+      await File(f.path).delete();
+    }
+  }
+
+  /// 获取指定日期范围内的日志文件（包含起止日期）
+  static Future<List<File>> getLogsBetween(
+      DateTime fromDate, DateTime toDate) async {
+    final dir = await getApplicationDocumentsDirectory();
+    final logFiles = <File>[];
+    final dateFormat = DateFormat('yyyy-MM-dd');
+
+    for (DateTime date = fromDate;
+        !date.isAfter(toDate);
+        date = date.add(Duration(days: 1))) {
+      final fileName = '${dateFormat.format(date)}.log';
+      final file = File('${dir.path}/$fileName');
+      if (await file.exists()) {
+        logFiles.add(file);
+      }
+    }
+
+    return logFiles;
+  }
+}