json - Flutter如何从JSON HTTP响应中获取特定值

Question

我正在使用此代码将json数据上传到我的nodejs服务器。

   HttpClient client = new HttpClient();
  var data = createSamplePayment().toJson();
  var request = await client.openUrl('POST', Uri.parse(serverEndpoint + '/paymentrequests'));
  request.headers.set(HttpHeaders.contentTypeHeader, 'APPLICATION/JSON');
  request.write(json.encode(data));
  var response = await request.close();
  String reply = await response.transform(utf8.decoder).join();
  print(reply);

print(reply)的输出是:

flutter: {"url":"https://paymentrequests/86C0110D","token":"w8SWavZNjOG","id":"C3C4966AF64D8CE194F5E3C"}

但是我只想获得“ token ”值。我该如何解决？我以许多不同的方式尝试过但没有成功。

Answer 1

class DetailsModel {
  String url;
  String token;
  String id;

  DetailsModel({this.url, this.token, this.id});

  DetailsModel.fromJson(Map<String, dynamic> json) {
    url = json['url'];
    token = json['token'];
    id = json['id'];
  }

  Map<String, dynamic> toJson() {
    final Map<String, dynamic> data = new Map<String, dynamic>();
    data['url'] = this.url;
    data['token'] = this.token;
    data['id'] = this.id;
    return data;
  }
}

首先，将您的响应转换为模型，然后执行上面的代码。然后绘制您的回应。

DetailsModel details = DetailsModel.fromJson(response);

然后，您可以简单地使用访问详细信息。

dynamic token = details.token; 
print(token); // w8SWavZNjOG