Question

我正在尝试使用httpclient将文件从Android应用程序上传到flask服务器。我总是从服务器获得400错误的请求错误

public String send()
{
    try {
        url = "http://192.168.1.2:5000/audiostream";
        File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath(), "/test.pcm");
        Log.d ("file" , file.getCanonicalPath());
        try {

            Log.d("transmission", "started");
            HttpClient httpclient = new DefaultHttpClient();

            HttpPost httppost = new HttpPost(url);
            ResponseHandler Rh = new BasicResponseHandler();

            InputStreamEntity reqEntity = new InputStreamEntity(new FileInputStream(file), -1);
            reqEntity.setContentType("binary/octet-stream");
            reqEntity.setChunked(true); // Send in multiple parts if needed

            httppost.setEntity(reqEntity);
            HttpResponse response = httpclient.execute(httppost);

            response.getEntity().getContentLength();
            StringBuilder sb = new StringBuilder();
            try {
                BufferedReader reader =
                        new BufferedReader(new InputStreamReader(response.getEntity().getContent()), 65728);
                String line;

                while ((line = reader.readLine()) != null) {
                    sb.append(line);
                }
            }
            catch (IOException e) { e.printStackTrace(); }
            catch (Exception e) { e.printStackTrace(); }


            Log.d("Response", sb.toString());
            Log.d("Response", "StatusLine : " + response.getStatusLine() + " Entity: " + response.getEntity()+ " Locate: " + response.getLocale() + " " + Rh);
            return sb.toString();
        } catch (Exception e) {
            // show error
            Log.d ("Error", e.toString());
            return e.toString();
        }
    }
    catch (Exception e)
    {
        Log.d ("Error", e.toString());
        return e.toString();
    }

}

但是当我正确使用curl文件上传时 curl -i -F filedata = @“/ home / rino / test.pcm”http://127.0.0.1:5000/audiostream 服务器配置

import os
from werkzeug.utils import secure_filename
from flask import Flask, jsonify, render_template, request, redirect,         url_for, make_response, send_file, flash
app = Flask(__name__)
app.debug = True


UPLOAD_FOLDER = '/home/rino/serv'
app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER

@app.route('/audiostream',methods=['GET', 'POST'])
def audiostream():
if request.method == 'POST':
    file = request.files['filedata']
    filename = secure_filename(file.filename)
    fullpath = os.path.join(app.config['UPLOAD_FOLDER'], filename)
    file.save(fullpath)
    return jsonify(results=['a','b'])

if request.method == 'GET':
    return "it's uploading page"

if __name__ == "__main__":
    app.run(host='0.0.0.0')

所以，我认为我的错误是微不足道的，但我无法认出来。

Answer 1

当Flask无法访问请求中的密钥时，会抛出400 Bad Request。我的猜测（仅通过查看代码）是您尝试提取request.files['filedata']，但它并不存在于Java请求中。

但它在卷曲请求中-F filedata。

试着看一下：Http POST in Java (with file upload)。它显示了如何使用HttpClient和HttpPost向表单上载添加部件的示例。

根据this post，您可能需要添加＆＃34; multipart / form-data＆＃34;的编码类型。同样。

tl; dr - Flask正在寻找请求词典中的一个filedata键，你不会发送一个。

如何从Android应用程序修复在flask服务器上的文件上传400错误

1 个答案: