脚本宝典收集整理的这篇文章主要介绍了Flutter网络请求的3种简单实现方法，脚本宝典觉得挺不错的，现在分享给大家，也给大家做个参考。
概述：
App几乎都离不开与服务器的交互，本文主要讲解了flutter网络请求三种方式 flutter自带的HttpClient、 第三方库http 和 第三方库Dio 的简单实现 GET 和 POST请求，本文是笔者学习Flutter网络模块知识总结，若有问题还望不腻赐教。
一.系统自带HttpClient
1.使用中温馨提示
1.1.导入库
import 'dart:io'; // 网络请求 import 'dart:convert'; // 数据解析
1.2.Uri的多种初始化方式
// 方法1 Uri uri = Uri(scheme: 'https', host: 'app.xxx.COM', path: homeNoviceListUrl); // 方法2 Uri uri = Uri.https('app.xxx.com', homeNoviceListUrl); // uri方法3 Uri uri = Uri.parse(baseUrl + homeNoviceListUrl);
2.简单使用
2.1.GET请求
// 1.1 HttpClient - get void loadData_Sys_get() async { PRint('------loadData_sys_get--------'); VAR httpClient = new HttpClient(); var params = Map<String, String>(); // uri方法1 Uri uri = Uri(scheme: 'https', host: 'app.xxx.com', path: homeNoviceListUrl); // uri方法2 // Uri uri = Uri.https( // 'app.xxx.com', homeNoviceListUrl); // uri方法3 // Uri uri = Uri.parse(baseUrl + homeNoviceListUrl); var request = await httpClient.getUrl(uri); var headers = Map<String, String>(); headers['loginSource'] = 'IOS'; headers['useVersion'] = '3.1.0'; headers['isencoded'] = '1'; headers['bundleid'] = 'com.xxx.xxx'; request.headers.add("LOGinSource", "IOS"); request.headers.add("useVersion", "3.1.0"); request.headers.add("isEncoded", "1"); request.headers.add("bundleId", "com.xxx.xxx"); var response = awaIT request.close(); var responseBody = await response.transform(Utf8Decoder()).join(); if (response.statusCode == HttpStatus.ok) { print('请求头：${response.headers}'); print('111请求成功代发数据为:/n $responseBody'); print('--------------'); Map data = jsonDecode(responseBody); print('222请求成功代发数据为:/n $data'); } else { print('/n/n/n11111==请求失败${response.statusCode}'); } }
2.2.POST请求
注意点：请求参数需要编码后放在request中
void loadData_sys_post() async { print('------loadData_sys_post--------'); 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: "app.xxx.com", path: homeRegularListUrl); // HttpClientRequest request = await httpClient.postUrl(uri); var url = baseUrl + homeRegularListUrl; 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"); request.headers.set("bundleId", "com.xxx.xxx"); // Content-tyPE大小写都ok request.headers.set('content-type', 'application/json'); /// 添加请求体 /// https://stackoverflow.com/questions/50278258/http-post-with-json-on-body-flutter-dart/50295533 Map jsonMap = {'currentPage': '1'}; request.add(utf8.encode(json.encode(jsonMap))); 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); print(responseBody); } } 二.请求第三方库 http
1.使用中温馨提示
1.1.添加依赖
1.2.导入库
import 'package:http/http.dart' as http; //导入前需要配置
2.简单使用
2.1. GET请求
2.2.1. http - get1
void loadData_http_get() async { print('------loadData_http_get--------'); var client = http.Client(); var uri = Uri.parse(baseUrl + homeNoviceListUrl); http.Response response = await client.get(uri); if (response.statusCode == HttpStatus.ok) { print(response.body); } else { print('请求失败 code 码为${response.statusCode}'); } } 2.2. http - get简便方法（链式编程）
void loadData_http_get_convenience() async { print('------简便方法loadData_http_get_convenience--------'); var uri = Uri.parse(baseUrl + homeNoviceListUrl); http.Client().get(uri).then((http.Response response) { if (response.statusCode == HttpStatus.ok) { print(response.body); } else { print('请求失败 code 码为${response.statusCode}'); } }); } 2.2. POST请求
2.2.1. http - post
void loadData_http_post() async { print('------ loadData_http_post --------'); var headers = Map<String, String>(); headers["loginSource"] = "IOS"; headers["useVersion"] = "3.1.0"; headers["isEncoded"] = "1"; headers["bundleId"] = "com.xxx.xxx"; headers["loginSource"] = "IOS"; headers["Content/-Type"] = "application/json"; Map params = {'currentPage': '1'}; // 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(baseUrl + homeNoviceListUrl); http.Response response = await httpClient.post(uri, body: jsonParams, headers: headers); if (response.statusCode == HttpStatus.ok) { print(response.body); } else { print('请求失败 code 码���${response.statusCode}'); } } 2.2.2. http - Post简便方法（链式编程）
void loadData_http_post_convenience() async { print('------ loadData_http_post --------'); var headers = Map<String, String>(); headers["loginSource"] = "IOS"; headers["useVersion"] = "3.1.0"; headers["isEncoded"] = "1"; headers["bundleId"] = "com.xxx.xxx"; headers["loginSource"] = "IOS"; headers["Content/-Type"] = "application/json"; Map params = {'currentPage': '1'}; // 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 url = baseUrl + homeRegularListUrl; httpClient.post(url, body: jsonParams, headers: headers).then((response) { print("Response status: ${response.statusCode}"); print("Response body: ${response.body}"); }).whencomplete(httpClient.close); } 三.请求第三方库 Dio
1.使用中温馨提示
1.1.添加依赖
dependencies: dio: ^2.0.11 #latest version
1.2.导入库
import 'package:dio/dio.dart';
2.简单使用
2.1. GET请求
注意：Dio的get请求（baseUrl都是在dio.option.baseUrl设置的） 请求头可以在dio.option上设置，也可以在新建的option上设置,新建option是可选的
void loadData_dio_get() async { var headers = Map<String, String>(); headers['loginSource'] = 'IOS'; headers['useVersion'] = '3.1.0'; headers['isEncoded'] = '1'; headers['bundleId'] = 'com.xxx.xxx'; headers['Content-Type'] = 'application/json'; Dio dio = Dio(); dio.options.headers.addAll(headers); dio.options.baseUrl = baseUrl; Response response = await dio.get(homeNoviceListUrl); if (response.statusCode == HttpStatus.ok) { print(response.headers); print(response.data); } } 2.2. POST请求
注意：
dio.options.method设置是无效
Dio dio = Dio();
dio.options.method = 'post';办法：
新建一个Options对象，然后在发起请求的时候进行设置：
Options option = Options(method:'post');
Response response = await dio.request(homeRegularListUrl,data:{"currentPage": "1"}, options: option);
2.2.1. dio - 方式一（baseUrl都是在dio.option.baseUrl设置的）
注意：直接在 dio.options设置除methods以外的 请求头参数
void loadData_dio_dioOfOptionsSetting() async { debugPrint( ' /n post请求 ======================= 开始请求 =======================/n'); var headers = Map<String, String>(); headers['loginSource'] = 'IOS'; headers['useVersion'] = '3.1.0'; headers['isEncoded'] = '1'; headers['bundleId'] = 'com.xxx.xxx'; headers['Content-Type'] = 'application/json'; Dio dio = Dio(); dio.options.baseUrl = baseUrl; dio.options.connectTimeout = 60000; dio.options.receiveTimeout = 60000; dio.options.headers.addAll(headers); dio.options.method = 'post'; Options option = Options(method: 'post'); // Response response = await dio.request(homeRegularListUrl, // data: {"currentPage": "1"}, options: option); Response response = await dio.post(homeRegularListUrl, data: {"currentPage": "1"}, options: option); if (response.statusCode == HttpStatus.ok) { debugPrint('请求参数： ${response.request.queryParameters}'); debugPrint( '-------------------请求成功,请求结果如下:-----------------/n /n===请求求url: ${response.request.uri.toString()} /n /n===请求 ���: /n${response.headers} /n /n===请求结果: /n${response.data}/n'); debugPrint('-------------------请求成功,请求结果打印完毕----------------'); } else { print('请求失败'); } } 2.2.2. dio - 方式二（baseUrl都是在dio.option.baseUrl设置的）
注意：在新建的option上设置请求头参数
void loadData_dio_newOptionSetting() async { debugPrint(' /n======================= 开始请求 =======================/n'); var headers = Map<String, String>(); headers['loginSource'] = 'IOS'; headers['useVersion'] = '3.1.0'; headers['isEncoded'] = '1'; headers['bundleId'] = 'com.xxx.xxx'; headers['Content-Type'] = 'application/json'; Options option = Options(method: 'post'); option.connectTimeout = 60000; option.receiveTimeout = 60000; option.headers.addAll(headers); Dio dio = Dio(); dio.options.baseUrl = baseUrl; Response response = await dio.post(homeRegularListUrl, data: {"currentPage": 1}, options: option); // Response response = await dio.request(homeRegularListUrl, // data: {"currentPage": 1}, options: option); if (response.statusCode == HttpStatus.ok) { debugPrint('请求参数： ${response.request.queryParameters}'); debugPrint( '-------------------请求成功,请求结果如下:-----------------/n /n===请求url: ${response.request.uri.toString()} /n /n===请求 头: /n${response.headers} /n /n===请求结果: /n${response.data}/n'); debugPrint('-------------------请求成功,请求结果打印完毕----------------'); } else { print('请求失败'); } } 总结
以上是脚本宝典为你收集整理的Flutter网络请求的3种简单实现方法全部内容，希望文章能够帮你解决Flutter网络请求的3种简单实现方法所遇到的问题。
本图文内容来源于网友网络收集整理提供，作为学习参考使用，版权属于原作者。
如您有任何意见或建议可联系处理。小编QQ：384754419，请注明来意。