Flutter开发之——网络请求-http

发表于 分类于 ， ， 阅读时长 ≈ 2 分钟

一 概述

  • http是一个可组合，基于Future的库，用于HTTP请求(A composable, Future-based library for making HTTP requests)
  • 该软件包包含高级功能和类，可轻松使用HTTP资源。它是多平台的，并且支持移动设备，台式机和浏览器

二 http

2.1 项目地址

  • Github地址：https://github.com/dart-lang/http
  • packages地址：https://pub.dev/packages/http

2.2 添加或删除软件

插件安装

打开CMD终端，执行如下指令(自动添加pubspec.yaml依赖)

Dart项目:

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dart pub add http

Flutter项目:

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flutter pub add http

插件卸载

Dart项目:

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dart pub remove http

Flutter项目:

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flutter pub remove http

执行命令

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flutter pub get

2.3 执行网络请求

顶级函数请求

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

var url = Uri.parse('https://example.com/whatsit/create');
var response = await http.post(url, body: {'name': 'doodle', 'color': 'blue'});

客户端请求并关闭

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var client = http.Client();
try {
  var uriResponse = await client.post(Uri.parse('https://example.com/whatsit/create'),
      body: {'name': 'doodle', 'color': 'blue'});
} finally {
  client.close();
}

2.4 请求方法

  • get
  • post
  • head
  • delete
  • put
  • patch
  • read
  • readBytes

三 接口

玩Android 开放API-登录

登录用户信息

  • url：https://www.wanandroid.com/user/login
  • username：wanandroidUser1
  • password：123456

四 示例

4.1 请求参数包含在uri中

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var uri = Uri(
      scheme: 'https',
      host: 'www.wanandroid.com',
      path: '/user/login',
      //queryParameters: {'username': 'wanandroidUser1', 'password': '123456'}
      );
  var client=Client();
  Response response= await client.post(uri);
  setState(() {
    _data=response.body;
  });
  print(response.body);
}

4.2 请求参数包含在body中

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var uri = Uri(
     scheme: 'https',
     host: 'www.wanandroid.com',
     path: '/user/login',
     );
 var client=Client();
 Response response= await client.post(uri,body: {'username': 'wanandroidUser1', 'password': '123456'});
 setState(() {
   _data=response.body;
 });
 print(response.body);

4.3 设置显示

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String _data;
body: Center(child: Text("$_data"),),

4.4 打印结果

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I/flutter (15765): {"data":{"admin":false,"chapterTops":[],"coinCount":0,"collectIds":[],"email":"","icon":"","id":99295,"nickname":"wanandroidUser1","password":"","publicName":"wanandroidUser1","token":"","type":0,"username":"wanandroidUser1"},"errorCode":0,"errorMsg":""}