【发布时间】：2021-04-15 07:26:27
【问题描述】：
我打算使用从 android 应用程序发送的发布请求将视频发送到烧瓶服务器。我收到此错误
werkzeug.exceptions.BadRequestKeyError: 400 Bad Request: The browser (or proxy) sent a request that this server could not understand.
KeyError: 'file'
以下是烧瓶服务器的 python 代码。请注意，我正在尝试使用 for 循环获取文件（MultiDict）的内容以进行调试。我在 powershell 窗口上没有输出。另外，由于错误是KeyError: 'file'，我知道files变量为空？
from flask import Flask, request, jsonify
path_upload_folder = 'C:\\Users\\vishw\\Desktop\\cse535a3_uploads\\uploads'
app = Flask(__name__)
app.config['path_upload_folder'] = path_upload_folder
@app.route('/mainapp', methods=['GET', 'POST'])
def upload_video():
print('Started')
if request.method == 'POST':
keys = request.files.keys()
for each in keys:
print(each)
sent_file = request.files['file']
sent_file.save(app.config['path_upload_folder'] + '\\' + secure_filename(sent_file.filename))
return jsonify(operation_status="true")
return jsonify(operation_status="false")
app.run(host="0.0.0.0", port=5000, debug=True)
这里是android应用的相关代码
public class ExampleGesture extends AppCompatActivity {
private final int VIDEO_CAPTURE = 1;
private VideoView example_gesture;
private boolean captured_video = false;
private MediaType object_mediatype;
private Intent intent_record_video;
private File file_media;
private String name_file;
private String gesture_received;
private String address_server_ipv4;
private String port_number;
private String posturl;
private int count_files = -1;
private int [] count_practice; //= ((MainApplication)getApplication()).count_practice;
private HashMap links;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_example_gesture);
// Log.i("APP: ", getApplication().getClass().getSimpleName());
Log.i("EG: ", "Under Super");
Log.i("EXAMACTTHREAD: ", String.valueOf((Thread.currentThread()).getId()));
Context context_current = getApplicationContext();
new Thread(new Runnable() {
public void run() {
Log.i("EXAMACTTHREADNEW: ", String.valueOf((Thread.currentThread()).getId()));
// Log.i("EG: ", "Setting COntent View");
count_practice = ((MainApplication)getApplication()).count_practice;
Intent intent_current = getIntent();
String gesture = intent_current.getStringExtra("EXTRA_GESTURE");
gesture_received = gesture;
ArrayAdapter<CharSequence> arrayAdapter_gestures = ArrayAdapter.createFromResource(context_current,
R.array.list_gestures,
android.R.layout.simple_spinner_item);
// Log.i("ARRAY: ", String.valueOf(arrayAdapter_gestures.getCount()));
links = new HashMap();
for (int index = 0; index < arrayAdapter_gestures.getCount(); ++index) {
// Log.i("ARRAY: ", (arrayAdapter_gestures.getItem(index)).toString());
if (!((arrayAdapter_gestures.getItem(index)).toString().equals("Select Gesture"))) {
links.put((arrayAdapter_gestures.getItem(index)).toString(), 0);
}
}
// Log.i("GESTURE: ", gesture);
String path_file = "/sdcard/Movies/";
if (gesture == "FanUp") {
path_file = path_file + "H-IncreaseFanSpeed.mp4";
} else if (gesture == "FanDown") {
path_file = path_file + "H-DecreaseFanSpeed.mp4";
} else path_file = path_file + "H-" + gesture + ".mp4";
Uri u1 = Uri.fromFile(new File(path_file));
example_gesture = (VideoView)findViewById(R.id.videoView_gesture);
example_gesture.setVideoURI(u1);
example_gesture.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer arg_mp) { example_gesture.start(); }
});
example_gesture.start();
Button button_record = (Button) findViewById(R.id.button_record);
button_record.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg_view) {
intent_record_video = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);
intent_record_video.putExtra(MediaStore.EXTRA_DURATION_LIMIT, 5);
File k = new File("/storage/self/primary/DCIM/Camera/");
count_files = (k.list()).length;
startActivityForResult(intent_record_video, VIDEO_CAPTURE);
}
});
Button button_previous_screen = (Button) findViewById(R.id.button_previous_screen);
button_previous_screen.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg_view) {
startActivity(new Intent(getApplicationContext(), MainActivity.class));
}
});
Button button_upload = (Button) findViewById(R.id.button_upload);
button_upload.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg_view) {
if (name_file.length() > 0) {
RequestBody postbody = RequestBody.create(object_mediatype, file_media);
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder()
.url(posturl)
.post(postbody)
.build();
Log.i("REQUEST: ", "Throwing a request");
client.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(final Call call, final IOException e) {
call.cancel();
Log.i("REQUEST: ", "Call canceled");
}
@Override
public void onResponse(Call call, final Response response) throws IOException {
}
});
name_file = "";
}
}
});
address_server_ipv4 = "192.168.0.113";
port_number = "5000";
posturl = "http://" + address_server_ipv4 + ":" + port_number + "/mainapp";
Thread.currentThread().interrupt();
}
}).start();
}
@Override
protected void onResume() {
super.onResume();
Log.i("THREAD: ", "ran the resume thread");
File file = new File("/storage/self/primary/DCIM/Camera/");
String[] list_files = file.list();
if (list_files.length > count_files && count_files != -1) {
captured_video = true;
count_files = list_files.length;
}
if (!example_gesture.isPlaying()) {
example_gesture.start();
}
if (captured_video) {
// File file = new File("/storage/self/primary/DCIM/Camera/");
// String[] list_files = file.list();
for (int index = 0; index < list_files.length; ++index) {
if ((list_files[index]).charAt(0) == 'V') {
File f = new File(file.getPath() +'/' + list_files[index]);
name_file = file.getPath() + '/' + gesture_received
+ "_PRACTICE_"
+ count_practice[(int) links.get(gesture_received)] + "_desai.mp4";
File f2 = new File(name_file);
boolean result = f.renameTo(f2);
file_media = f2;
++count_practice[(int) links.get(gesture_received)];
break;
}
}
captured_video = false;
object_mediatype = MediaType.parse("video/mp4");
}
}
}
正如我之前提出的，请求中的文件变量是否为空？即文件没有被发送？另外，请就我是否以正确的方式发送视频文件提出您的意见。如果我也弄错了，请告诉我正确的方法。
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