将图像从java客户端发送到python服务器

Question

我是java的新手，过去几天我一直坚持这个问题。我正在将图像从java客户端发送到python服务器。我收到了200请求，意味着正在建立连接。但是图像没有在服务器端读取。我已经包含了代码 - 任何帮助都会很棒。

服务器代码

def index(request):


data = {"POST REQUEST, INSIDE INDEX, NO URL OR IMAGE SENT": False}
if request.method == "GET":
    return HttpResponse("GET REQUEST WORKS. RR.")

if request.method == "POST":
    # check to see if an image was uploaded
    if request.FILES.get("image", None) is not None:
        # grab the uploaded image 
        image = request.FILES["image"]

    # otherwise, assume that a URL was passed in
    else:
        # grab the URL from the request
        url = request.POST.get("url", None)

        # if the URL is None, then return an error
        if url is None:
            return HttpResponse("no URL is specified")

        # load the image and convert
        image = _grab_image(url=url)

    req = image
    arr = np.asarray(bytearray(req.read()), dtype=np.uint8)
    img = cv2.imdecode(arr,-1) # 'load it as it is'

    Server = True   

    Student_Answers = []
    image = doc_Scan(img)
    if (image == "ERROR"):
        return HttpResponse("TAKE ANOTHER PICTURE")
    else:   
        images = crop_answer2(image)
        for i in range(0,8):
            ans = images[i]
            Answer = Input_Image(ans,Server)
            print ('Final Answer = ', Answer)
            Student_Answers.append(Answer)
        Results, score =  mark_paper(Server,Student_Answers)

    Worded_Respose = "The Student got ", score, " correct"

    return HttpResponse(Results, content_type="application/json")
else:
    return HttpResponse("NO POST REQUEST")

客户代码

public static void main(String [] args) throws Exception{

 String url = "http://########";
// 2. create obj for the URL class
 URL obj = new URL(url);
  // 3. open connection on the url
    HttpURLConnection con = (HttpURLConnection) obj.openConnection();
     con.setRequestMethod("POST");
     con.setDoOutput(true);


  try {

 System.out.println("Reading image from disk. ");
 img = ImageIO.read(new File("image.jpg"));
 ByteArrayOutputStream baos = new ByteArrayOutputStream();

 ImageIO.write(img, "jpg", baos);
 baos.flush();

 byte[] bytes = baos.toByteArray();
 baos.close();

 System.out.println("Sending image to server. ");

 OutputStream out = con.getOutputStream();
 DataOutputStream image = new DataOutputStream(out);

 image.writeInt(bytes.length);
 image.write(bytes, 0, bytes.length);

 System.out.println("Image sent to server. ");

 image.close();
 // close the output stream
 out.close();

  }catch (Exception e) {
     System.out.println("Exception: " + e.getMessage());
     soc.close();
   }

   // define object for the reply from the server
          BufferedReader in = new BufferedReader(new        InputStreamReader(con.getInputStream()));
        //Get response from server
       int responseCode = con.getResponseCode();
      System.out.println("Response Code : " + responseCode);
      // read in the response from the server
            String inputLine;
          StringBuffer response = new StringBuffer();
            while ((inputLine = in.readLine()) != null) {
                response.append(inputLine);
                 System.out.println(inputLine);
            }
      // close the input stream
                in.close();

     }

 }