本文主要是介绍【flutter-DIO-JSON】多层嵌套读取，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
当JSON返回结果是多层嵌套的时候，可以通过逐层解析来提取所需的数据。以下是一个简单的示范例子，展示了如何处理一个3层嵌套的JSON返回结果：
import 'package:dio/dio.dart';void main() async {Dio dio = Dio();try {Response response = await dio.get('https://jsonplaceholder.typicode.com/todos/1');if (response.statusCode == 200) {Map<String, dynamic> data = response.data;// 提取第一层数据int userId = data['userId'];int id = data['id'];String title = data['title'];// 提取第二层数据Map<String, dynamic> nestedData = data['nestedData'];int nestedId = nestedData['nestedId'];String nestedInfo = nestedData['nestedInfo'];// 提取第三层数据Map<String, dynamic> deeplyNestedData = nestedData['deeplyNestedData'];int deeplyNestedId = deeplyNestedData['deeplyNestedId'];String deeplyNestedInfo = deeplyNestedData['deeplyNestedInfo'];// 打印提取后的数据print('User ID: $userId');print('ID: $id');print('Title: $title');print('Nested ID: $nestedId');print('Nested Info: $nestedInfo');print('Deeply Nested ID: $deeplyNestedId');print('Deeply Nested Info: $deeplyNestedInfo');} else {print('Request failed with status: ${response.statusCode}');}} catch (e) {print('Error: $e');}
}
在这个示例中，我们假设返回的JSON数据有3层嵌套结构，我们逐层提取数据并打印出来。可以根据实际情况调整代码以适应您的数据结构。
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