Flutter之测试Http和HttpClient

1 测试Http和HttpClient

导入包：在pubspec.yaml里面导入

  http: ^0.12.2

main.dart里面导入

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

2 代码实现


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

void main() {
  runApp(MyApp1());
}

class MyApp1 extends StatelessWidget {

  void getWeatherData() async {
      try {
        HttpClient httpClient = HttpClient();
        HttpClientRequest request = await httpClient.getUrl(Uri.parse("http://pv.sohu.com/cityjson?ie=utf-8"));
        HttpClientResponse response = await request.close();
        var result =  await response.transform(utf8.decoder).join();
        print(result);
        httpClient.close();
      } catch (e) {
        print("get data fail $e");
      } finally {

      }
  }

  @override
  Widget build(BuildContext context) {
      return MaterialApp(
          title: 'open url',
          home: Scaffold(
            appBar: AppBar(
              // Here we take the value from the MyHomePage object that was created by
              // the App.build method, and use it to set our appbar title.
              title: Text('hello flutter'),
            ),
            body: Center(
              child: Column(
                // Column is also a layout widget. It takes a list of children and
                // arranges them vertically. By default, it sizes itself to fit its
                // children horizontally, and tries to be as tall as its parent.
                //
                // Invoke "debug painting" (press "p" in the console, choose the
                // "Toggle Debug Paint" action from the Flutter Inspector in Android
                // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
                // to see the wireframe for each widget.
                //
                // Column has various properties to control how it sizes itself and
                // how it positions its children. Here we use mainAxisAlignment to
                // center the children vertically; the main axis here is the vertical
                // axis because Columns are vertical (the cross axis would be
                // horizontal).
                mainAxisAlignment: MainAxisAlignment.center,
                children: <Widget>[
                  Text(
                    'hello word flutter',
                  ),
                  RaisedButton(
                    onPressed: () {
                      const url = 'https://www.baidu.com';
                      http.get(url).then((response) {
                          print("状态 is ${response.statusCode}");
                          print("内容 is ${response.body}");
                        }
                      );
                    },
                    child: Text('test Http'),
                  ),
                  RaisedButton(
                    onPressed: getWeatherData,
                    child: Text('test HttpClient get weather'),
                  ),
                ],
              ),
            ),
          ),
      );
  }
}

3 运行结果

点击test Http日志打印如下

I/flutter (27404): 状态 is 200
I/flutter (27404): 内容 is <html>
I/flutter (27404): <head>
I/flutter (27404): <script>
I/flutter (27404): location.replace(location.href.replace("https://","http://"));
I/flutter (27404): </script>
I/flutter (27404): </head>
I/flutter (27404): <body>
I/flutter (27404): <noscript><meta http-equiv="refresh" content="0;url=http://www.baidu.com/"></noscript>
I/flutter (27404): </body>
I/flutter (27404): </html>

点击 test HttpClient get weather日志打印如下

I/flutter (27404): var returnCitySN = {"cip": "220.250.29.154", "cid": "350100", "cname": "福建省福州市"};
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