执行http请求并将Json格式转换为dart对象时出现问题

import 'package:http/http.dart' as http;

Future<void> fetchData() async {
  try {
    final response = await http.get(Uri.parse('https://api.example.com/data'));
    if (response.statusCode == 200) {
      // 处理响应数据
    } else {
      print('请求失败: ${response.statusCode}');
    }
  } catch (e) {
    print('网络请求异常: $e');
  }
}

import 'dart:convert';

Future<void> parseJson(String jsonString) {
  try {
    final jsonData = json.decode(jsonString);
    // 假设有一个User类
    final user = User.fromJson(jsonData);
    print(user);
  } catch (e) {
    print('JSON解析错误: $e');
  }
}

class User {
  final String name;
  final int age;

  User({required this.name, required this.age});

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

class User {
  final String name;
  final int age;

  User({required this.name, required this.age});

  factory User.fromJson(Map<String, dynamic> json) {
    return User(
      name: json['name'] as String,
      age: json['age'] as int,
    );
  }
}