Flutter中使用Cookies

Cookie

Cookie 是一种在用户的浏览器中存储的小型文本文件，用于保存有关用户和他们的访问信息。它们通常用于以下目的：

封装Cookies类 

import 'dart:html' as html;
 
class Cookies {
  // 单例模式
  static final Cookies _instance = Cookies._internal();
 
  factory Cookies() {
    return _instance;
  }
 
  Cookies._internal(); // 私有构造函数
 
  // 设置 cookie
  static void set(String name, String value,
      {Map<String, dynamic>? attributes}) {
    if (attributes != null && attributes.containsKey('expires')) {
      if (attributes['expires'] is int) {
        final expires =
            DateTime.now().add(Duration(days: attributes['expires']));
        attributes['expires'] = expires.toUtc().toIso8601String();
      }
    }
 
    name = Uri.encodeComponent(name);
    String cookieString = '$name=${Uri.encodeComponent(value)}';
 
    attributes?.forEach((key, value) {
      if (value != null) {
        cookieString += '; $key';
        if (value is String) {
          cookieString += '=${Uri.encodeComponent(value)}';
        }
      }
    });
 
    html.document.cookie = cookieString;
  }
 
  // 获取 cookie
  static String? get(String name) {
    if (name.isEmpty) {
      return null;
    }
 
    var cookies = html.document.cookie?.split('; ') ?? [];
    for (var cookie in cookies) {
      var parts = cookie.split('=');
      var value = parts.sublist(1).join('=');
 
      try {
        var found = Uri.decodeComponent(parts[0]);
        if (name == found) {
          return value;
        }
      } catch (e) {
        // 处理异常
      }
    }
    return null;
  }
 
  // 删除 cookie
  static void remove(String name, {Map<String, dynamic>? attributes}) {
    set(name, '', attributes: {
      ...?attributes,
      'expires': -1, // 设置为 -1，表示立即过期
    });
  }
}

方法描述