使用 Flutter 和 Dio 解析 json 文件

如何解决使用 Flutter 和 Dio 解析 json 文件

在此函数中，我发出 POST 请求以从 API 获取信息。我得到一个 json 文件作为回报，我只是想知道如何解析 json 文件以转换为对象。

在我的代码中，我怎么说只打印 json 文件中每个项目的“分数”值？或创建一个植物 ID 对象？我不知道如何让它们连接起来。

这是我目前的代码：

这是调用API请求的函数

Future<PlantId> upload({String imageFile,String imagePath}) async {
  String apiKey = "2b10SIEW7oBMIMc6FWThazVk";

  FormData formData = new FormData.fromMap({
    "organs": "flower","images": await MultipartFile.fromFile(imagePath,filename: imageFile,contentType: new MediaType("images","png"))
  });

  Dio dio = new Dio();

  Response response = await dio.post("https://my-api.plantnet.org/v2/identify/all?api-key=" + apiKey,data: formData,options: Options());

  int statusCode = response.statusCode;
  print (statusCode);

  if (statusCode == 200) {

    print("status code: " + statusCode.toString() + "... it worked!");
    final jsonResponse = jsonDecode(response.toString());
    print (jsonResponse);

    return PlantId.fromJson(jsonResponse);

  }

  else{
    print("error status code: " + statusCode.toString() + " ... :(");
  }



}

这是我必须解析json文件的类

class PlantId {

  PlantId({
    this.language,this.results,});

  String language;
  List<Result> results;

  factory PlantId.fromJson(Map<String,dynamic> json) => PlantId(
    language: json["language"],results: List<Result>.from(json["results"].map((x) => Result.fromJson(x))),);

  Map<String,dynamic> toJson() => {
    "language": language,"results": List<dynamic>.from(results.map((x) => x.toJson())),};
  

}

class Result {
  Result({
    this.score,this.species,});

  double score;
  Species species;


  factory Result.fromJson(Map<String,dynamic> json) => Result(
    score: json["score"].toDouble(),species: Species.fromJson(json["species"]),dynamic> toJson() => {
    "score": score,"species": species.toJson(),};
}

class Species {
  Species({
    this.scientificNameWithoutAuthor,this.scientificNameAuthorship,this.genus,this.family,this.commonNames,});

  String scientificNameWithoutAuthor;
  String scientificNameAuthorship;
  Family genus;
  Family family;
  List<String> commonNames;

  factory Species.fromJson(Map<String,dynamic> json) => Species(
    scientificNameWithoutAuthor: json["scientificNameWithoutAuthor"],scientificNameAuthorship: json["scientificNameAuthorship"],genus: Family.fromJson(json["genus"]),family: Family.fromJson(json["family"]),commonNames: List<String>.from(json["commonNames"].map((x) => x)),dynamic> toJson() => {
    "scientificNameWithoutAuthor": scientificNameWithoutAuthor,"scientificNameAuthorship": scientificNameAuthorship,"genus": genus.toJson(),"family": family.toJson(),"commonNames": List<dynamic>.from(commonNames.map((x) => x)),};
}

class Family {
  Family({
    this.scientificNameWithoutAuthor,});

  String scientificNameWithoutAuthor;
  String scientificNameAuthorship;

  factory Family.fromJson(Map<String,dynamic> json) => Family(
    scientificNameWithoutAuthor: json["scientificNameWithoutAuthor"],};
}

这是我正在使用的示例 json 响应：

{
    "query": {
        "project": "best","images": [
            "0a942848b4ae052a89e82b2d31a89ffd"
        ],"organs": [
            "flower"
        ]
    },"language": "en","preferedReferential": "the-plant-list","results": [
        {
            "score": 0.9777618646621704,"species": {
                "scientificNameWithoutAuthor": "Echinopsis chamaecereus","scientificNameAuthorship": "H.Friedrich & Glaetzle","genus": {
                    "scientificNameWithoutAuthor": "Echinopsis","scientificNameAuthorship": ""
                },"family": {
                    "scientificNameWithoutAuthor": "Cactaceae","commonNames": [
                    "Peanut Cactus"
                ]
            },"gbif": {
                "id": "5623114"
            }
        },{
            "score": 0.00500953895971179,"species": {
                "scientificNameWithoutAuthor": "Echinocereus poselgeri","scientificNameAuthorship": "Lem.","genus": {
                    "scientificNameWithoutAuthor": "Echinocereus","commonNames": [
                    "Dahlia Apple Cactus","Dahlia Hedgehog Cactus"
                ]
            },"gbif": {
                "id": "3084136"
            }
        }
    ],"remainingIdentificationRequests": 46
}