Beispiel der POST-request in Android studio

Verwenden HttpURLConnection es nicht die Verwendung von externen Bibliotheken. Wenn Sie eine HttpURLConnection, es muss ein AsyncTask.

Hier ist mein code aus einem Projekt, das ich abgeschlossen. Hoffe, es hilft.

Ersten, setzen Sie diese in Ihre manifest.xml Datei vor :

<uses-permission android:name="android.permission.INTERNET" />

Aufruf der AsyncTask:

(Ignorieren dies, SinceTime, und GoesAddress. Sie sind einfach nur Variablen, die ich übergeben)

    URL url = new URL("https://eddn.usgs.gov/cgi-bin/fieldtest.pl");
    new ReceiveData(this, SinceTime, GoesAddress).execute(url);

Klasse:

package com.ryan.scrapermain;

import android.content.Context;
import android.os.AsyncTask;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;

import javax.net.ssl.HttpsURLConnection;


public class ReceiveData extends AsyncTask<URL, Integer, Long> {

    String response = "";
    String SinceTime;
    String GoesAddress;
    Context myContext;

    ReceiveData(Context context, String since, String goes) {
        this.myContext = context;
        SinceTime = since;
        GoesAddress = goes;
        }

    private String getPostDataString(HashMap<String, String> params) throws UnsupportedEncodingException {
        StringBuilder feedback = new StringBuilder();
        boolean first = true;
        for(Map.Entry<String, String> entry : params.entrySet()){
            if (first)
                first = false;
            else
                feedback.append("&");

            feedback.append(URLEncoder.encode(entry.getKey(), "UTF-8"));
            feedback.append("=");
            feedback.append(URLEncoder.encode(entry.getValue(), "UTF-8"));
        }

        return feedback.toString();
    }

    public void getData() throws IOException {

        HashMap<String, String> params = new HashMap<>();
        params.put("DCPID", GoesAddress);
        params.put("SINCE", SinceTime);

        URL url = new URL("https://eddn.usgs.gov/cgi-bin/fieldtest.pl");
        HttpURLConnection client = null;
        try {
            client = (HttpURLConnection) url.openConnection();
            client.setRequestMethod("POST");
            //You need to specify the context-type.  In this case it is a
            //form submission, so use "multipart/form-data"
            client.setRequestProperty("multipart/form-data", "https://eddn.usgs.gov/fieldtest.html;charset=UTF-8");
            client.setDoInput(true);
            client.setDoOutput(true);

            OutputStream os = client.getOutputStream();
            BufferedWriter writer = new BufferedWriter(
                    new OutputStreamWriter(os, "UTF-8"));
            writer.write(getPostDataString(params));

            writer.flush();
            writer.close();
            os.close();
            int responseCode = client.getResponseCode();

            if (responseCode == HttpsURLConnection.HTTP_OK) {
                String line;
                BufferedReader br = new BufferedReader(new InputStreamReader(client.getInputStream()));
                while ((line = br.readLine()) != null) {
                    response += line;
                }
            }
            else {
                response = "";
            }
        }
        catch (MalformedURLException e){
            e.printStackTrace();
        }
        finally {
            if(client != null) //Make sure the connection is not null.
                client.disconnect();
        }
    }

    @Override
    protected Long doInBackground(URL... params) {
        try {
            getData();
        } catch (IOException e) {
            e.printStackTrace();
        }

        //This counts how many bytes were downloaded
        final byte[] result = response.getBytes();
        Long numOfBytes = Long.valueOf(result.length);
        return numOfBytes;
    }

    protected void onPostExecute(Long result) {
        System.out.println("Downloaded " + result + " bytes");
        //This is just printing it to the console for now.
        System.out.println(response);
        //In the following two line I pass the string elsewhere and decode it.
        InputCode input = new InputCode();
        input.passToDisplay(myContext, response);
    }
}