如何使用Dart的HttpClient上传PDF？

本文介绍了如何使用Dart的HttpClient上传PDF？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我需要将一个PDF文件发布到一个远程REST API，我不能为我的生活找出来。不管我做什么，服务器响应我还没有将一个对象与文件参数相关联。让我们说，我有一个PDF test.pdf 。这是我到目前为止做的：

I need to post a PDF file to a remote REST API, and I can't for the life of me figure it out. No matter what I do, the server responds that I have not yet associated an object with the file parameter. Let's say that I have a PDF called test.pdf. This is what I've been doing so far:

// Using an HttpClientRequest named req

req.headers.contentType = new ContentType('application', 'x-www-form-urlencoded');
StringBuffer sb = new StringBuffer();
String fileData = new File('Test.pdf').readAsStringSync();
sb.write('file=$fileData');
req.write(sb.toString());
return req.close();

到目前为止，我已经尝试过几乎每个组合和编码的数据， c> write（）到请求，但是没有效果。我已经尝试发送它作为 codeUnits ，我已经尝试编码它使用 UTF8.encode ，我尝试使用 Latin1Codec 编码它，一切。

Thus far, I've tried virtually every combination and encoding of the data that I write() to the request, but to no avail. I've tried sending it as codeUnits, I've tried encoding it using a UTF8.encode, I've tried encoding it using a Latin1Codec, everything. I'm stumped.

推荐答案

p>您可以使用：

var uri = Uri.parse("http://pub.dartlang.org/packages/create");
var request = new http.MultipartRequest("POST", url);
request.fields['user'] = 'john@doe.com';
request.files.add(new http.MultipartFile.fromFile(
    'package',
    new File('build/package.tar.gz'),
    contentType: new ContentType('application', 'x-tar'));
request.send().then((response) {
  if (response.statusCode == 200) print("Uploaded!");
});

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