新增多语言转换 mqtt支持websocket

lib/base/language/Language.dart

@@ -0,0 +1,68 @@
+import 'dart:convert';
+import 'dart:io';
+
+class Language {
+  static final String defalutLocale = "zh_CN";
+
+  static final Map<String, Map<String, String>> _translations = {};
+
+  static void setLanguage(String locale,
+      {String? path, Map<String, String>? language}) {
+    //载入json文件
+    if (path != null) {
+      try {
+        //暂时只支持本地文件
+        var file = File(path);
+        file.readAsString().then((data) {
+          _translations[locale] = _flattenJson(jsonDecode(data));
+        });
+      } catch (e) {
+        print(e);
+      }
+      return;
+    }
+
+    if (language != null) {
+      //构建翻译kv
+      _translations[locale] = _flattenJson(language);
+    }
+  }
+
+  // 扁平化嵌套 JSON 数据
+  static Map<String, String> _flattenJson(Map<String, dynamic> json,
+      [String prefix = '']) {
+    final Map<String, String> flatMap = {};
+    json.forEach((key, value) {
+      final newKey = prefix.isEmpty ? key : '$prefix.$key';
+      if (value is Map<String, dynamic>) {
+        flatMap.addAll(_flattenJson(value, newKey));
+      } else {
+        flatMap[newKey] = value.toString();
+      }
+    });
+    return flatMap;
+  }
+
+  static void resetLanguage({String? locale}) {
+    if (locale == null) {
+      //清空全部语言文件
+      _translations.clear();
+    } else {
+      //清空指定语言文件
+      _translations.remove(locale);
+    }
+  }
+
+  static String getTranslation(String key,
+      {String? languageCode, Map<String, String>? params}) {
+    var locale = languageCode ?? defalutLocale;
+    String text = _translations[locale]?[key] ?? key;
+
+    // 替换动态参数（如 @name）
+    params?.forEach((key, value) {
+      text = text.replaceAll('@$key', value);
+    });
+
+    return text;
+  }
+}

lib/base/language/extensions/StringExt.dart

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+import '../Language.dart';
+
+extension StringTransform on String {
+  String tr({Map<String, String>? params, String? languageCode}) {
+    return Language.getTranslation(this,
+        params: params, languageCode: languageCode);
+  }
+}