dependencies:

  http: ^0.12.0 #latest version

import 'package:http/http.dart' as http; //导入前需要配置

var data;

  _fetchGet() async {

    Map newTitle;

    final response =

        await http.get('https://jsonplaceholder.typicode.com/posts/1');

    final responseJson = json.decode(response.body);

    print("请求成功 ---------- "+responseJson.toString());

    newTitle = responseJson;

    setState(() {

      data = newTitle['title'];

      print("title====" + data);

    });

  }

void _httpPost() async {

    //头部

    var headers = Map<String, String>();

    headers["loginSource"] = "IOS";

    headers["useVersion"] = "3.1.0";

    headers["isEncoded"] = "1";

    headers["bundleId"] = "com.nongfadai.iospro";

    headers["loginSource"] = "IOS";

    headers["Content-Type"] = "application/json";

    //参数

    Map params = {'v': '1.0','month':'7','day':'25','key':'bd6e35a2691ae5bb8425c8631e475c2a'};

    // 嵌套两层都可以，但是具体哪个好还有待确认？？？？

    var jsonParams = utf8.encode(json.encode(params));

    // var jsonParams = json.encode(params);

    var httpClient = http.Client();

    var uri = Uri.parse("http://api.juheapi.com/japi/toh");

    http.Response response =

    await httpClient.post(uri, body: jsonParams, headers: headers);

    if (response.statusCode == HttpStatus.ok) {

      print('请求成功');

      print(response.headers);//打印头部信息

      print("post------${response.body}");

    } else {

      print('请求失败 code 码${response.statusCode}');

    }

  }

class HttpMain extends StatefulWidget {

  @override

  createState() => new HttpPage();

}

class HttpPage extends State<HttpMain> {

  @override

  Widget build(BuildContext context) {

    _fetchGet();

    _httpPost();

    return new MaterialApp(

      title: 'Fetch Data Example',

      theme: new ThemeData(

        primarySwatch: Colors.blue,

      ),

      home: new Scaffold(

        appBar: new AppBar(

          title: new Text('Fetch Data Example'),

        ),

        body: new Center(

          child: new Text("$data"),

        ),

      ),

    );

  }

}