在 Flutter 中从 Node.js rest api 获取数据时出错（Mysql Localhost）

Question

错误：发生异常。 _TypeError（“List”类型不是“Map”类型的子类型）

Future<Album> fetchAlbum() async{ 
    final response = await http.get(Uri.encodeFull("192.168.43.106:8080/customers/"),
                                    headers: { "Accept": "application/json" } );
    if (response.statusCode == 200) {
        return Album.fromJson(json.decode(response.body));
    }
    else{
        throw Exception('Failed to load Album');
    }
}
class  Album {
final int id;
final String email;
final String name;

Album({this.id, this.email, this.name});

factory Album.fromJson(Map<String, dynamic> json){
  return Album(
    id: json['id'],
    email: json['email'],
    name: json['name'],
  );
}

}

在此处输入图片说明

Answer 1

您的响应是对象列表，而不是单个对象。 因此，您必须传递列表的 [0] 索引。

试试下面的代码，它会为你工作。

Future<Album> fetchAlbum() async{ 
    final response = await http.get(Uri.encodeFull("192.168.43.106:8080/customers/"),
                                    headers: { "Accept": "application/json" } );
    if (response.statusCode == 200) {
        var str = jsonDecode(response.body);
        return Album.fromJson(str[0]);
    }
    else{
        throw Exception('Failed to load Album');
    }
}

class  Album {

  int id;
  String email;
  String name;

  Album({this.id, this.email, this.name});

  Album.fromJson(json)
    : id = json['id'],
      email = json['email'].toString(),
      name = json['name'].toString();

}