如何在Dart命令行HttpClient中进行POST

Question

我正忙着组建一个能够进行http POST的Dart命令行客户端.我知道我不能使用dart:html库并且必须使用dart:io

开始似乎很简单:

HttpClient client = new HttpClient();
client.getUrl(Uri.parse("http://my.host.com:8080/article"));

问题是:正确的语法和顺序是什么使它HttpClient做一个POST并能够将JSON编码的字符串传递到这篇文章？

Answer 1

使用http包和dart:convert

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

void main() {


  var url = 'http://httpbin.org/post';
  http.post(url, body: JSON.encode({'test': 'value'})).then((response) {
    print("Response status: ${response.statusCode}");
    print("Response body: ${response.body}");
  });
}

如需添加自定义标题,处理错误等,请参阅https://www.dartlang.org/dart-by-example/#making-a-post-request

Answer 2

我想向您推荐dio软件包，dio是Dart / Flutter的强大Http客户端，它支持拦截器，FormData，请求取消，文件下载，超时等。

dio非常易于使用：

执行获取请求：

response=await dio.get(url)

执行POST请求：

response=await dio.post(url,data:{"id":12,"name":"wendu"})

发送FormData：

FormData formData = new FormData.from({
   "name": "wendux",
   "file1": new UploadFileInfo(new File("./upload.pdf"), "upload1.pdf")
});
response = await dio.post("/info", data: formData)

下载文件：

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

更多细节请参考Github中的dio：https : //github.com/flutterchina/dio。