Flutter开发 网络请求

HttpClient（dart自有）

1.get
点击请求按钮获取数据，解析数据获取单词展示到屏幕上。

class MyState extends State {
  String info = "暂无数据";

  List<Widget> texts = [];

  @override
  void initState() {
    super.initState();
  }

  @override
  Widget build(BuildContext context) {

    void parseJson(var body) {

      List<Widget> wList = [];
      List data = jsonDecode(body)["data"];
      for (int i = 0; i < data.length; i++) {
        print(data[i]["word"]);
        Text text = Text(data[i]["word"]);
        wList.add(text);
      }
      setState(() {
        texts = wList;
      });
    }

    void getData() async {

      String url =
          "https://7a6396f8-09a1-4ade-b42a-f6db7776fb31.mock.pstmn.io/flutter";
      var httpClient = HttpClient();
      var request = await httpClient.getUrl(Uri.parse(url));
      var response = await request.close();

      var body = await response.transform(utf8.decoder).join();
      if (response.statusCode == 200) {
        setState(() {
          info = body;
        });
        parseJson(body);
      }
    }

    return Scaffold(
      appBar: AppBar(
        title: Text("登录"),
        centerTitle: true,
        backgroundColor: Colors.blue,
        foregroundColor: Colors.white,
      ),
      body: ListView(children: texts),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          getData();
        },
        child: Text("请求"),
      ),
    );
  }
}

2.post

  void postData() async {
    String url = "https://7a6396f8-09a1-4ade-b42a-f6db7776fb31.mock.pstmn.io/q";
    HttpClient httpClient = HttpClient();
    HttpClientRequest request = await httpClient.postUrl(Uri.parse(url));
    // 设置请求头
    request.headers.set('Content-Type', 'application/json; charset=UTF-8');
    Map<String, dynamic> pMap = {"random:": "q"};
    request.write(jsonEncode(pMap));
    HttpClientResponse response = await request.close();
    // 检查响应状态码
    if (response.statusCode == HttpStatus.ok) {
      // 读取响应内容
      final String responseBody = await response.transform(utf8.decoder).join();
      print('POST 响应数据: $responseBody');
    } else {
      print('请求失败，状态码: ${response.statusCode}');
    }
  }

原生http请求库（插件）

导入依赖

dependencies:
  http: ^1.4.0

代码

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

  void httpGet() async {
    String url =
        "https://7a6396f8-09a1-4ade-b42a-f6db7776fb31.mock.pstmn.io/flutter";
    var result = await http.get(Uri.parse(url));
    if (result.statusCode == HttpStatus.ok) {
      print(result.body.toString());
    }
  }

  //post
  void httpPost(var body) async {
    String url = "https://7a6396f8-09a1-4ade-b42a-f6db7776fb31.mock.pstmn.io/q";
    var result = await http.post(Uri.parse(url), body: body);
    if (result.statusCode == HttpStatus.ok) {
      print(result.body.toString());
    }else{
      print(result.statusCode);
    }
  }

解析xml

<books>
    <book id="101">
        <title>XML入门指南</title>
        <author>李四</author>
        <price>39.90</price>
        <publisher>科技出版社</publisher>
    </book>
    <book id="102">
        <title>Web开发实战</title>
        <author>王五</author>
        <price>59.00</price>
        <publisher>电子工业出版社</publisher>
    </book>
</books>

      xml.XmlDocument xmlDocument = xml.XmlDocument.parse(result.body);
      Iterable<xml.XmlElement> xmlElement = xmlDocument.findElements("books");

      Iterable<xml.XmlElement> books = xmlElement.single.findAllElements("book");
      books.forEach((element) {

        print(element.findElements("id").single.innerText);
        print(element.findElements("title").single.innerText);
      },);

I/flutter ( 3477): 101
I/flutter ( 3477): XML入门指南
I/flutter ( 3477): 102
I/flutter ( 3477): Web开发实战