var data;

  _get() async {

    Map newTitle;

    var responseBody;

    var url = 'https://jsonplaceholder.typicode.com/posts/1';

    var httpClient = new HttpClient();

    var request = await httpClient.getUrl(Uri.parse(url));

    var response = await request.close();

    if (response.statusCode == 200) {

      responseBody = await response.transform(utf8.decoder).join();

      responseBody = json.decode(responseBody);

      print(responseBody.toString());

      newTitle = responseBody;

      print("get:-------${newTitle}");

    } else {

      print("error");

      data = "null";

    }

    if (!mounted) return;

    //状态管理（该控制的核心在于：回调，更新数据在控件上）

    /**

     有三种方式：

      1、Widget自己管理State

      2、父类管理State

      3、混合管理

     */

    setState(() {

      data = newTitle['title'];

    });

  }

void _post() async {

    HttpClient httpClient = new HttpClient();

// queryParameters get请求的查询参数(适用于get请求？？？是吗？？？)

// Uri uri = Uri(

//     scheme: "https", host: "xxx.xxx.xxx.xxx", path: homeRegularListUrl);

// HttpClientRequest request = await httpClient.postUrl(uri);

    var url = "http://api.juheapi.com/japi/toh";

    HttpClientRequest request = await httpClient.postUrl(Uri.parse(url));

// 设置请求头

  /*  request.headers.set("loginSource", "IOS");

    request.headers.set("useVersion", "3.1.0");

    request.headers.set("isEncoded", "1");

// Content-Type大小写都ok

    request.headers.set('content-type', 'application/json');*/

    /// 添加请求体

    Map jsonMap = {'shopperId': 9356,'machineId':5117,'orderType':2,'orderId':108};

    Map<String, String> map1 = new Map();

    map1["v"] = "1.0";

    map1["month"] = "7";

    map1["day"] = "25";

    map1["key"] = "bd6e35a2691ae5bb8425c8631e475c2a";

    request.add(utf8.encode(json.encode(map1)));

    HttpClientResponse response = await request.close();

    String responseBody = await response.transform(utf8.decoder).join();

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

      print('请求成功');

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

      print("post------${responseBody}");

    }

  }

class HttpClientMain extends StatefulWidget {

  @override

  createState() => new HttpClientHttp();

}

class HttpClientHttp extends State<HttpClientMain> {

  @override

  Widget build(BuildContext context) {

    _get();

    _post();

    return Scaffold(

      appBar: new AppBar(

        title: new Text("net"),

      ),

      //body: new MyHomePage()

      body: new Center(

        child: new Text("$data"),

      ),

    );

  }

}