探针正在android中检索输出（由node.js产生）

Question

首先，请不要重复我的问题，因为我四处张望，找不到对我有益的东西。我实际上对Java EE和node.js完全不感兴趣。但是我有一个项目，成功的时间非常有限，因此我需要您的帮助。 到目前为止，我在Android上的成功使用了旧版库org.apache.http.legacy，因为我找到了使用该库完成的解决方案。无论如何，通过使用此库，我可以将图像成功发送到localhost中的服务器。服务器正在使用node.js。在服务器中，我将图像保存在Images文件夹中。我写了python代码，即CNN.py。（我稍后将此图像路径作为参数提供给CNN.py，只是想确保CNN.py正常工作。）Python代码运行良好。不久，我将android中的图像发送到node.js服务器。我收到图像并将图像保存在/ Images文件夹中。

问题是，CNN.py代码产生了一个输出，我可以在node.js中接收到，但是我想将其发送回Android的几乎所有方式都无法正常工作。我不知道为什么实际上，DownloadJSON类不起作用。我只想检索node.js产生的数据

请注意我对node.js和JavaEE不了解。我只需要立即完成。另外，请明确您的答案。

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private static final int RESULT_LOAD_IMAGE = 1;
private static final String SERVER_ADDRESS = "http://192.168.43.159:8000/api/upload";
String satir;
ImageView imageToUpload , downloadedImage;
Button bUploadImage, bDownloadImage;
EditText uploadImageName, downloadImageName;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    imageToUpload = (ImageView) findViewById(R.id.imageToUpload);
    downloadedImage = (ImageView) findViewById(R.id.downloadedImage);

    bUploadImage = (Button) findViewById(R.id.bUploadImage);
    bDownloadImage = (Button) findViewById(R.id.bDownloadImage);

    uploadImageName = (EditText) findViewById(R.id.etUploadName);
    downloadImageName = (EditText) findViewById(R.id.etDownlaodName);

    imageToUpload.setOnClickListener(this);
    bUploadImage.setOnClickListener(this);
    bDownloadImage.setOnClickListener(this);
}

@Override
public void onClick(View v) {
    switch (v.getId()){
        case R.id.imageToUpload:
            Intent galleryIntent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
            startActivityForResult(galleryIntent,RESULT_LOAD_IMAGE);
            break;
        case R.id.bUploadImage:
            Bitmap image = ((BitmapDrawable) imageToUpload.getDrawable()).getBitmap();
            new UploadImage(image, uploadImageName.getText().toString()).execute();
            break;
        case R.id.bDownloadImage:
            downloadImageName.setText("image is downloading...");
            new DownloadJSON().execute(SERVER_ADDRESS);
            break;

    }
}

@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if(requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && data !=null){
        Uri selectedImage = data.getData();
        imageToUpload.setImageURI(selectedImage);
    }
}

private class UploadImage extends AsyncTask<Void,Void,Void>{

    Bitmap image;
    String name;
    public UploadImage(Bitmap image, String name){
        this.image=image;
        this.name=name;
    }

    @Override
    protected Void doInBackground(Void... params) {
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        image.compress(Bitmap.CompressFormat.JPEG, 100, byteArrayOutputStream);
        String encodedImage = Base64.encodeToString(byteArrayOutputStream.toByteArray(), Base64.DEFAULT);

        ArrayList<NameValuePair> dataToSend = new ArrayList<>();
        dataToSend.add(new BasicNameValuePair("image",encodedImage));
        dataToSend.add(new BasicNameValuePair("name",name));

        HttpParams httpRequestParams = getHttpRequestParams();
        HttpClient client = new DefaultHttpClient(httpRequestParams);
        HttpPost post =  new HttpPost(SERVER_ADDRESS);


        try{
            post.setEntity(new UrlEncodedFormEntity(dataToSend));
            client.execute(post);
        }catch (Exception e){
            e.printStackTrace();
        }

        return null;
    }

    @Override
    protected void onPostExecute(Void aVoid) {
        super.onPostExecute(aVoid);
        Toast.makeText(getApplicationContext(),"Image Uploaded",Toast.LENGTH_SHORT).show();
    }
}

private HttpParams getHttpRequestParams(){
    HttpParams httpRequestParams = new BasicHttpParams();
    HttpConnectionParams.setConnectionTimeout(httpRequestParams, 1000*30);
    HttpConnectionParams.setSoTimeout(httpRequestParams, 1000*30);
    return  httpRequestParams;
}

private class DownloadJSON extends  AsyncTask<String, String, String>{
    @Override
    protected String doInBackground(String... strings) {

        try{
            URLConnection connection = new URL("http://192.168.43.159:8000/").openConnection();
            connection.setConnectTimeout(1000 * 30);
            connection.setReadTimeout(1000 * 30);
            return (String) connection.getContent();
        }catch(Exception e){
            e.printStackTrace();
        }
        return "errr";
    }

    protected void onPostExecute(String s) {
        Log.d("post Execute ",s);
        downloadImageName.setText(s);
    }
}

}

这是node.js代码

enter var Express = require('express');
var bodyParser = require('body-parser');
var fs = require("fs");
var app = Express();
//var val;

app.use(bodyParser.json(bodyParser.json({limit: "50mb"})));
app.use(bodyParser.urlencoded({limit: "50mb", extended: 
true,parameterLimit:50000}));

var imageFolderPath = "./Images/";
//app.get("/", function(req, res) {
//     res.send(val);
//});
app.post("/api/upload", function(req, res) {
  var base64Image = req.body.image;
  var imageName = req.body.name;
  fs.writeFile(imageFolderPath + imageName  + ".jpg", 
Buffer.from(base64Image, "base64"), function(file, err) {
 if(err) {
        console.log("Couldn't write file!");
      res.status(500).send({ status: "failed", msg: "Couldn't write file!" 
  });
 }
 console.log("File is uploaded");
 var spawn = require("child_process").spawn;
 var pythonProcss = spawn('python',["./servercnn.py"]);
 pythonProcss.stdout.on('data',function(data){
        val = data.toString();
        console.log(val);
        //res.send(data.toString());
     });
     //res.status(200).send({ status: "success", msg: "file is uploaded" 
     });
      });
    });


    app.listen(8000, function(a) {
        console.log("Listening to port 8000");
     });