Android HttpPost : comment obtenir le résultat

Question

J'essaie depuis longtemps d'envoyer une requête HttpPost et de récupérer la réponse, mais même si j'ai réussi à établir une connexion, je ne sais pas encore comment obtenir le message de la chaîne de caractères qui est renvoyé par la requête-réponse.

 HttpClient httpclient = new DefaultHttpClient();
 HttpPost httppost = new HttpPost("http://www.myurl.com/app/page.php");
 // Add your data   
 List < NameValuePair > nameValuePairs = new ArrayList < NameValuePair > (5);
 nameValuePairs.add(new BasicNameValuePair("type", "20"));
 nameValuePairs.add(new BasicNameValuePair("mob", "919895865899"));
 nameValuePairs.add(new BasicNameValuePair("pack", "0"));
 nameValuePairs.add(new BasicNameValuePair("exchk", "1"));

 try {
     httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
     Log.d("myapp", "works till here. 2");
     try {
         HttpResponse response = httpclient.execute(httppost);
         Log.d("myapp", "response " + response.getEntity());
     } catch (ClientProtocolException e) {
         e.printStackTrace();
     } catch (IOException e) {
         e.printStackTrace();
     }
 } catch (UnsupportedEncodingException e) {
     e.printStackTrace();
 } 

Je suis désolé, j'ai l'air très naïf parce que je suis nouveau en Java. Aidez-moi, s'il vous plaît.

Answer 1

Essayez d'utiliser le EntityUtil sur votre réponse :

String responseBody = EntityUtils.toString(response.getEntity());

Answer 2

    URL url;
    url = new URL("http://www.url.com/app.php");
    URLConnection connection;
    connection = url.openConnection();
    HttpURLConnection httppost = (HttpURLConnection) connection;
    httppost.setDoInput(true);
    httppost.setDoOutput(true);
    httppost.setRequestMethod("POST");
    httppost.setRequestProperty("User-Agent", "Tranz-Version-t1.914");
    httppost.setRequestProperty("Accept_Language", "en-US");
    httppost.setRequestProperty("Content-Type",
            "application/x-www-form-urlencoded");
    DataOutputStream dos = new DataOutputStream(httppost.getOutputStream());
    dos.write(b); // bytes[] b of post data

    String reply;
    InputStream in = httppost.getInputStream();
    StringBuffer sb = new StringBuffer();
    try {
        int chr;
        while ((chr = in.read()) != -1) {
            sb.append((char) chr);
        }
        reply = sb.toString();
    } finally {
        in.close();
    }

Cet extrait de code fonctionne. Je l'ai obtenu après une longue recherche, mais à partir d'un code J2ME.

Answer 3

Vous pouvez appeler la méthode d'exécution avec un ResponseHandler. Voici un exemple :

ResponseHandler<String> responseHandler = new BasicResponseHandler();
String response = httpClient.execute(httppost, responseHandler);

Answer 4

Vous pouvez le faire de cette façon :

 public class MyHttpPostProjectActivity extends Activity implements OnClickListener {

        private EditText usernameEditText;
        private EditText passwordEditText;
        private Button sendPostReqButton;
        private Button clearButton;

        /** Called when the activity is first created. */
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.login);

            usernameEditText = (EditText) findViewById(R.id.login_username_editText);
            passwordEditText = (EditText) findViewById(R.id.login_password_editText);

            sendPostReqButton = (Button) findViewById(R.id.login_sendPostReq_button);
            sendPostReqButton.setOnClickListener(this);

            clearButton = (Button) findViewById(R.id.login_clear_button);
            clearButton.setOnClickListener(this);        
        }

        @Override
        public void onClick(View v) {

            if(v.getId() == R.id.login_clear_button){
                usernameEditText.setText("");
                passwordEditText.setText("");
                passwordEditText.setCursorVisible(false);
                passwordEditText.setFocusable(false);
                usernameEditText.setCursorVisible(true);
                passwordEditText.setFocusable(true);
            }else if(v.getId() == R.id.login_sendPostReq_button){
                String givenUsername = usernameEditText.getEditableText().toString();
                String givenPassword = passwordEditText.getEditableText().toString();

                System.out.println("Given username :" + givenUsername + " Given password :" + givenPassword);

                sendPostRequest(givenUsername, givenPassword);
            }   
        }

        private void sendPostRequest(String givenUsername, String givenPassword) {

            class SendPostReqAsyncTask extends AsyncTask<String, Void, String>{

                @Override
                protected String doInBackground(String... params) {

                    String paramUsername = params[0];
                    String paramPassword = params[1];

                    System.out.println("*** doInBackground ** paramUsername " + paramUsername + " paramPassword :" + paramPassword);

                    HttpClient httpClient = new DefaultHttpClient();

                    // In a POST request, we don't pass the values in the URL.
                    //Therefore we use only the web page URL as the parameter of the HttpPost argument
                    HttpPost httpPost = new HttpPost("http://www.nirmana.lk/hec/android/postLogin.php");

                    // Because we are not passing values over the URL, we should have a mechanism to pass the values that can be
                    //uniquely separate by the other end.
                    //To achieve that we use BasicNameValuePair             
                    //Things we need to pass with the POST request
                    BasicNameValuePair usernameBasicNameValuePair = new BasicNameValuePair("paramUsername", paramUsername);
                    BasicNameValuePair passwordBasicNameValuePAir = new BasicNameValuePair("paramPassword", paramPassword);

                    // We add the content that we want to pass with the POST request to as name-value pairs
                    //Now we put those sending details to an ArrayList with type safe of NameValuePair
                    List<NameValuePair> nameValuePairList = new ArrayList<NameValuePair>();
                    nameValuePairList.add(usernameBasicNameValuePair);
                    nameValuePairList.add(passwordBasicNameValuePAir);

                    try {
                        // UrlEncodedFormEntity is an entity composed of a list of url-encoded pairs. 
                        //This is typically useful while sending an HTTP POST request. 
                        UrlEncodedFormEntity urlEncodedFormEntity = new UrlEncodedFormEntity(nameValuePairList);

                        // setEntity() hands the entity (here it is urlEncodedFormEntity) to the request.
                        httpPost.setEntity(urlEncodedFormEntity);

                        try {
                            // HttpResponse is an interface just like HttpPost.
                            //Therefore we can't initialize them
                            HttpResponse httpResponse = httpClient.execute(httpPost);

                            // According to the JAVA API, InputStream constructor do nothing. 
                            //So we can't initialize InputStream although it is not an interface
                            InputStream inputStream = httpResponse.getEntity().getContent();

                            InputStreamReader inputStreamReader = new InputStreamReader(inputStream);

                            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

                            StringBuilder stringBuilder = new StringBuilder();

                            String bufferedStrChunk = null;

                            while((bufferedStrChunk = bufferedReader.readLine()) != null){
                                stringBuilder.append(bufferedStrChunk);
                            }

                            return stringBuilder.toString();

                        } catch (ClientProtocolException cpe) {
                            System.out.println("First Exception caz of HttpResponese :" + cpe);
                            cpe.printStackTrace();
                        } catch (IOException ioe) {
                            System.out.println("Second Exception caz of HttpResponse :" + ioe);
                            ioe.printStackTrace();
                        }

                    } catch (UnsupportedEncodingException uee) {
                        System.out.println("An Exception given because of UrlEncodedFormEntity argument :" + uee);
                        uee.printStackTrace();
                    }

                    return null;
                }

                @Override
                protected void onPostExecute(String result) {
                    super.onPostExecute(result);

                    if(result.equals("working")){
                        Toast.makeText(getApplicationContext(), "HTTP POST is working...", Toast.LENGTH_LONG).show();
                    }else{
                        Toast.makeText(getApplicationContext(), "Invalid POST req...", Toast.LENGTH_LONG).show();
                    }
                }           
            }

            SendPostReqAsyncTask sendPostReqAsyncTask = new SendPostReqAsyncTask();
            sendPostReqAsyncTask.execute(givenUsername, givenPassword);     
        }
    }

Answer 5

Essayez ceci, ça semble être le plus compact. Bien que dans le monde réel, vous devrez utiliser une requête asynchrone pour que le dispositif ne se bloque pas pendant la récupération de la page demandée.

http://www.softwarepassion.com/Android-series-get-post-and-multipart-post-requests/