Android: Comment en programmant de connexion au site et de récupérer des données à partir d'elle?

Pour cela, vous devez envoyer deux requêtes POST. Dans la première demande, vous devez envoyer des données de connexion et d'enregistrer des cookies, si le succès de la connexion. Dans la deuxième demande, ont besoin d'envoyer les cookies enregistrés et vous pouvez obtenir les données.
Les données pour le POST doit être formaté comme ceci: var=valeur&var2=valeur2

Dans votre cas:

String data = "studKnNr=login&asmKodas=password";

Et url pour la requête: https://medeine.vgtu.lt/studentams/submit.jsp

Regarder code suivant:

String data = "studKnNr=login&asmKodas=password";
String loginUrl = "https://medeine.vgtu.lt/studentams/submit.jsp";
String Login = POST_req(loginUrl, data, 10000); /*last parameter is a limit of page content length*/
//And after succcess login you can send second request:
String pageContent = POST_req(someUrl, "", 10000);
//Methods for sending requests and saving cookie: 
//(this no needs for changing, can only past to you project)
public String POST_req(String url, String post_data, int len) {
URL addr = null;
try {
addr = new URL(url);
} catch (MalformedURLException e) {
return "Некорректный URL";
}
StringBuffer data = new StringBuffer();
HttpURLConnection conn = null;
try {
conn = (HttpURLConnection) addr.openConnection();
} catch (IOException e) {
return "Open connection error";
}
conn.setRequestProperty("Connection", "keep-alive");
conn.setRequestProperty("Accept-Language", "ru,en-GB;q=0.8,en;q=0.6");
conn.setRequestProperty("Accept-Charset", "utf-8");
conn.setRequestProperty("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8");
conn.setRequestProperty("Cookie", "");
conn.setDoOutput(true);
conn.setDoInput(true);
//conn.setInstanceFollowRedirects(true);
set_cookie(conn);
//POST data: 
String post_str = post_data;
data.append(post_str);
try {
conn.connect();
} catch (IOException e) {
return "Connecting error";
}
DataOutputStream dataOS = null;
try {
dataOS = new DataOutputStream(conn.getOutputStream());
} catch (IOException e2) {
return "Out stream error";
}
try {
((DataOutputStream) dataOS).writeBytes(data.toString());
} catch (IOException e) {
return "Out stream error 1";
}
/*If redirect: */
int status;
try {
status = conn.getResponseCode();
} catch (IOException e2) {
return "Response error";
}
if (status == HttpURLConnection.HTTP_MOVED_TEMP || status == HttpURLConnection.HTTP_MOVED_PERM || status == HttpURLConnection.HTTP_SEE_OTHER) {
String new_url = conn.getHeaderField("Location");
String cookies = conn.getHeaderField("Set-Cookie");
URL red_url;
try {
red_url = new URL(new_url);
} catch (MalformedURLException e) {
return "Redirect error";
}
try {
conn = (HttpURLConnection) red_url.openConnection();
} catch (IOException e) {
return "Redirect connection error";
}
//conn.setRequestProperty("Content-type", "text/html");
conn.setRequestProperty("Connection", "keep-alive");
conn.setRequestProperty("Accept-Language", "ru,en-GB;q=0.8,en;q=0.6");
conn.setRequestProperty("Accept-Charset", "utf-8");
conn.setRequestProperty("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8");
conn.setRequestProperty("Cookie", cookies);     
conn.setDoOutput(true);
conn.setDoInput(true);
//conn.setInstanceFollowRedirects(true);
}
java.io.InputStream in = null;
try {
in = (java.io.InputStream) conn.getInputStream();
} catch (IOException e) {
return "In stream error";
}
InputStreamReader reader = null;
try {
reader = new InputStreamReader(in, "UTF-8");
} catch (UnsupportedEncodingException e) {
return "In stream error";
}
char[] buf = new char[len];
try {
reader.read(buf);
} catch (IOException e) {
return "In stream error";
}
get_cookie(conn);
return (new String(buf));
}
public void get_cookie(HttpURLConnection conn) {
SharedPreferences sh_pref_cookie = getSharedPreferences("cookies", Context.MODE_PRIVATE);
String cook_new;
String COOKIES_HEADER;
if (conn.getHeaderField("Set-Cookie") != null) {
COOKIES_HEADER = "Set-Cookie";
}
else {
COOKIES_HEADER = "Cookie";
}
cook_new = conn.getHeaderField(COOKIES_HEADER);
if (cook_new.indexOf("sid", 0) >= 0) {
SharedPreferences.Editor editor = sh_pref_cookie.edit();
editor.putString("Cookie", cook_new);
editor.commit();
}
}
public void set_cookie(HttpURLConnection conn) {
SharedPreferences sh_pref_cookie = getSharedPreferences("cookies", Context.MODE_PRIVATE);
String COOKIES_HEADER = "Cookie";
String cook = sh_pref_cookie.getString(COOKIES_HEADER, "no_cookie");
if (!cook.equals("no_cookie")) {
conn.setRequestProperty(COOKIES_HEADER, cook);
}
}

Bien sûr, vous devez envoyer les demandes dans async fil.

Espère qu'il est utile. Et excusez-moi pour mon mauvais anglais:)

si vous souhaitez vous connecter à l'application en java ou en android, alors vous devez essayer avec HTTPPOST

exemple de code:

public class HttpPostExample extends Activity {
TextView content;
EditText fname, email, login, pass;
String Name, Email, Login, Pass;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_http_post_example);
content    =   (TextView)findViewById( R.id.content );
fname      =   (EditText)findViewById(R.id.name);
email      =   (EditText)findViewById(R.id.email);
login      =    (EditText)findViewById(R.id.loginname);
pass       =   (EditText)findViewById(R.id.password);
Button saveme=(Button)findViewById(R.id.save);
saveme.setOnClickListener(new Button.OnClickListener(){
public void onClick(View v)
{
try{
//CALL GetText method to make post method call
GetText();
}
catch(Exception ex)
{
content.setText(" url exeption! " );
}
}
}); 
}
//Create GetText Metod
public  void  GetText()  throws  UnsupportedEncodingException
{
//Get user defined values
Name = fname.getText().toString();
Email   = email.getText().toString();
Login   = login.getText().toString();
Pass   = pass.getText().toString();
//Create data variable for sent values to server 
String data = URLEncoder.encode("name", "UTF-8")
+ "=" + URLEncoder.encode(Name, "UTF-8");
data += "&" + URLEncoder.encode("email", "UTF-8") + "="
+ URLEncoder.encode(Email, "UTF-8");
data += "&" + URLEncoder.encode("user", "UTF-8")
+ "=" + URLEncoder.encode(Login, "UTF-8");
data += "&" + URLEncoder.encode("pass", "UTF-8")
+ "=" + URLEncoder.encode(Pass, "UTF-8");
String text = "";
BufferedReader reader=null;
//Send data
try
{
//Defined URL  where to send data
URL url = new URL("http://androidexample.com/media/webservice/httppost.php");
//Send POST data request
URLConnection conn = url.openConnection();
conn.setDoOutput(true);
OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
wr.write( data );
wr.flush();
//Get the server response
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();
}
catch(Exception ex)
{
}
finally
{
try
{
reader.close();
}
catch(Exception ex) {}
}
//Show response on activity
content.setText( text  );
}
}

je suis l'obtention de cette source à partir de ce url dans cette url, vous obtenez tous les chose en rapport à votre requête.

ou Si vous souhaitez vous connecter à l' *Connexion FTP * ensuite, vous pouvez suivre soufflet code

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.SocketException;
import org.apache.commons.io.IOUtils;
import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
public class Ftpdemo {  
public static void main(String args[]) {  
//get an ftpClient object  
FTPClient ftpClient = new FTPClient();  
ftpClient.setConnectTimeout(300);
FileInputStream inputStream = null;  
try {  
//pass directory path on server to connect  
ftpClient.connect("ftp.mydomain.in");  
//pass username and password, returned true if authentication is  
//successful  
boolean login = ftpClient.login("myusername", "mypassword");  
if (login) {  
System.out.println("Connection established...");  
ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
ftpClient.enterLocalPassiveMode();
inputStream = new FileInputStream("/home/simmant/Desktop/mypic.png");  
boolean uploaded = ftpClient.storeFile("user_screens/test3.png",inputStream);
if (uploaded) {  
System.out.println("File uploaded successfully !");  
} else {  
System.out.println("Error in uploading file !");  
}  
//logout the user, returned true if logout successfully  
boolean logout = ftpClient.logout();  
if (logout) {  
System.out.println("Connection close...");  
}  
} else {  
System.out.println("Connection fail...");  
}  
} catch (SocketException e) {  
e.printStackTrace();  
} catch (IOException e) {  
e.printStackTrace();  
} finally {  
try {  
ftpClient.disconnect();  
} catch (IOException e) {  
e.printStackTrace();  
}  
}  
}
}