Dart 网络请求

推荐使用dio

官方用的是http，但是好多坑啊…，而且能力较弱
所以 使用dio吧，以下是官方文档
https://pub.dartlang.org/packages/dio

简易教程

https://www.cnblogs.com/fuyaozhishang/p/9252286.html

添加依赖

dependencies:
 flutter:
   sdk: flutter
 # The following adds the Cupertino Icons font to your application.
 # Use with the CupertinoIcons class for iOS style icons.
   cupertino_icons: ^0.1.2
   http: ^0.12.0+1
   dio: ^1.0.13
   html: ^0.13.3+3

发起一个 GET 请求 :

Response response; response=await dio.get(“/test?id=12&name=wendu”) print(response.data.toString()); // 请求参数也可以通过对象传递，上面的代码等同于： response=await dio.get(“/test”,data:{“id”:12,”name”:”wendu”}) print(response.data.toString());

发起一个 POST 请求:

response=await dio.post(“/test”,data:{“id”:12,”name”:”wendu”})

发起多个并发请求:

response= await Future.wait([dio.post(“/info”),dio.get(“/token”)]);

下载文件:

response=await dio.download("https://www.google.com/","./xx.html")

发送 FormData:

FormData formData = new FormData.from({ “name”: “wendux”, “age”: 25, }); response = await dio.post(“/info”, data: formData)

通过FormData上传多个文件:

FormData formData = new FormData.from({ “name”: “wendux”, “age”: 25, “file1”: new UploadFileInfo(new File(“./upload.txt”), “upload1.txt”) “file2”: new UploadFileInfo(new File(“./upload.txt”), “upload2.txt”) }); response = await dio.post(“/info”, data: formData)>

我的例子

import 'dart:convert';
import 'dart:io';
import 'dart:async';
import 'package:dio/dio.dart';
void main(){
  // base64('187233');
  postFind('dart');
  // getFind('book');
}
base64(String str1) {
  var bytes = utf8.encode(str1);
  var encoded1 = base64Encode(bytes);
  // print(encoded1);  // 返回编码列表
  // print(base64Decode(encoded1));  // 返回编码ac列表
  // print(String.fromCharCodes(base64Decode(encoded1)));  // 返回解码
  return encoded1;
}
postFind(book) async{
  Dio dio = new Dio();
  FormData formData = new FormData.from({"username": book});
  var response = await dio.post("http://139.199.169.159:90/signin", data: formData);
  print(response);
}
getFind(book) async{
  Dio dio = new Dio();
  var response = await dio.get("http://139.199.169.159:90/$book");
  print(response);
}

渲染

https://blog.csdn.net/sinat_17775997/article/details/82107779
https://blog.csdn.net/starshus/article/details/81570043
https://flutterchina.club/cookbook/networking/fetch-data/