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Flutter开发网络请求

news 2025/8/17 6:35:54

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。
请添加图片描述

class MyState extends State {String info = "暂无数据";List<Widget> texts = [];@overridevoid initState() {super.initState();}@overrideWidget 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());}}//postvoid 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