flutter解析json参考

参考的2段代码 https://flutter.dev/docs/cookbook/networking/background-parsing

First, create a Photo class that contains data about a photo. Include a fromJson() factory method to make it easy to create a Photo starting with a JSON object.

 

class Photo {
  final int id; final String title; final String thumbnailUrl; Photo({this.id, this.title, this.thumbnailUrl}); factory Photo.fromJson(Map<String, dynamic> json) { return Photo( id: json['id'] as int, title: json['title'] as String, thumbnailUrl: json['thumbnailUrl'] as String, ); } } 

Convert the response into a list of photos

Now, use the following instructions to update the fetchPhotos() function so that it returns a Future<List<Photo>>:

1. Create a parsePhotos() function that converts the response body into a List<Photo>.
2. Use the parsePhotos() function in the fetchPhotos() function.

 

// A function that converts a response body into a List<Photo>.
List<Photo> parsePhotos(String responseBody) { final parsed = json.decode(responseBody).cast<Map<String, dynamic>>(); return parsed.map<Photo>((json) => Photo.fromJson(json)).toList(); } Future<List<Photo>> fetchPhotos(http.Client client) async { final response = await client.get('https://jsonplaceholder.typicode.com/photos'); return parsePhotos(response.body); }