flutter demo02 http请求

import 'package:flutter/material.dart';
import 'dart:convert';
import 'dart:io';

void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
  //获取天气数据
  void getWeatherData() async {
    try {
      //实例化一个HttpClient对象
      var httpClient = new HttpClient();
//      HttpClient httpClient = new HttpClient();
      //发起请求
      var request = await httpClient.getUrl(Uri.parse("https://jsonplaceholder.typicode.com/posts/1"));
      //等待服务器返回数据
      HttpClientResponse response = await request.close();
      //使用utf8.decoder从response 里解析数据
      var result = await response.transform(utf8.decoder).join();
      //输出响应头
      print(result);
      //httpClient关闭
      httpClient.close();
    } catch (e) {
      print("请求失败: $e");
    } finally {

    }
  }
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return MaterialApp(
      title: 'httpClient请求',
      home: Scaffold(
        appBar: AppBar(
          title: Text('httpclient请求'),
        ),
        body: Center(
          child: RaisedButton(
            child: Text('获取天气数据'),
            onPressed: getWeatherData,
          ),
        ),
      ),
    );
  }
}