如何通过post方法发布HTTP

Question

我从位置管理器获取纬度和经度，但是它未与Thingboard HTTP物联网云连接。我使用了HTTP发布响应。它不会产生任何错误，但也不会传输任何数据。由于它是AsyncTask，因此不会产生任何错误。我已经对纬度和经度进行了编码

    package com.example.currentgpslocation;

import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;
import android.widget.Toast;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.URL;
import java.net.URLEncoder;

import javax.net.ssl.HttpsURLConnection;


public class MainActivity<policy> extends AppCompatActivity implements LocationListener {

    LocationManager locationManager;

    String GPS_PROVIDER;
    String data;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        Criteria criteria = new Criteria();

        GPS_PROVIDER = locationManager.getBestProvider(criteria, false);

        if (GPS_PROVIDER != null && !GPS_PROVIDER.equals("")) {
            if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                return;
            }
            Location location =  locationManager.getLastKnownLocation(locationManager.GPS_PROVIDER);;
            locationManager.requestLocationUpdates(GPS_PROVIDER, 15000, 1, this);

            if (location != null)
                onLocationChanged(location);

            else
                Toast.makeText(getBaseContext(), "No Location Provider Found Check Your Code", Toast.LENGTH_SHORT).show();
        }
    }

    @Override
    public void onLocationChanged(Location location) {

        TextView longitude = (TextView) findViewById(R.id.textView);
        TextView latitude = (TextView) findViewById(R.id.textView1);

        longitude.setText("Current Longitude:" + location.getLongitude());
        latitude.setText("Current Latitude:" + location.getLatitude());

        try {
            Object latitud = location.getLatitude();
            latitud = latitud.toString();
            Object longtitud = location.getLongitude();
            longtitud = longtitud.toString();

            data = URLEncoder.encode("latitude", "UTF-8")
                    + "=" + URLEncoder.encode(String.valueOf(latitude), "UTF-8");
            data += "," + URLEncoder.encode("longtitude", "UTF-8")
                    + "=" + URLEncoder.encode(String.valueOf(latitude), "UTF-8");



        }catch (Exception ex){
            ex.printStackTrace();

        }

        DemoTask  ob= new DemoTask();
        ob.execute();



    }
    public class DemoTask extends AsyncTask<String, String, String> {


        protected String doInBackground(String... arg0) {
            String text = "";
            BufferedReader reader = null;

            try {

                // Defined URL  where to send data
                URL url = new URL("https://cloud.thingsboard.io/api/v1/JD98YCFBU8ywGIwVmdFL/telemetry");
                HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
                conn.setRequestMethod("POST");
                conn.connect();
                int responseCode = conn.getResponseCode();
                OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream(), "UTF8");
                wr.write(data);
                conn.getErrorStream();
                wr.flush();
                reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
                StringBuilder sb = new StringBuilder();
                String line = null;


                // Read Server Response
                while ((line = reader.readLine()) != null) {
                    // Append server response in string
                    sb.append(line + "\n");
                }


                text = sb.toString();
                wr.close();
            } catch (Exception ex) {
                ex.printStackTrace();
            } finally {
                try {
                    reader.close();
                } catch (Exception ex) {
                    ex.printStackTrace();
                }
            }

            return null;
        }
    }










    @Override
    public void onPointerCaptureChanged(boolean hasCapture) {

    }
    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {

    }

    @Override
    public void onProviderEnabled(String provider) {

    }

    @Override
    public void onProviderDisabled(String provider) {

    }
}

生成错误： W / System.err：java.io.IOException：已关闭 W / System.err：at com.android.okhttp.okio.RealBufferedSink $ 1.write（RealBufferedSink.java:196）