Facebook – Login tramite una connessione HttpsURLConnection java

– effettuare una get connection su  “www.facebook.com”

    // Send a "GET" request, so that you can extract the form's data.
    StringBuffer page = http.sendGet(url);


– prendere  i cookies della response e  popolare il form con la propria email e password
     // set values in the form

    String postParams = http.getFormParams(page.toString(), "XXXXX@XXX.XX", "XXXXXXXX");

–  effettua l’autenticazione tramite una connessione post
    // send a POST request for authentication
    http.sendPost(fb, postParams);

– collegarsi alla home con l’utente loggato
    // success then go to facebook.
     StringBuffer result = http.sendGet(fbResult);
     System.out.println(result);



Esempio Completo
package com.fbm.batch;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.CookieHandler;
import java.net.CookieManager;
import java.net.CookiePolicy;
import java.net.CookieStore;
import java.net.HttpCookie;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

import javax.net.ssl.HttpsURLConnection;

import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;

public class ProvaLoginFB {

  private List<String> cookies;
  private HttpsURLConnection conn;
  private static CookieManager manager;

  private final String USER_AGENT = "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/34.0.1847.131 Safari/537.36";

  public static void main(String[] args) throws Exception {

    String url = "https://www.facebook.com/login.php";// primo login per prendere il form

    String fb = "https://www.facebook.com/login.php?login_attempt=1";

    String fbResult = "https://www.facebook.com/";
    ProvaLoginFB http = new ProvaLoginFB();

    // make sure cookies is turn on
    manager = new CookieManager();
    manager.setCookiePolicy(CookiePolicy.ACCEPT_ALL);
    CookieHandler.setDefault(manager);

    // Send a "GET" request, so that you can extract the form's data.
    StringBuffer page = http.sendGet(url);

    // set values in the form
    String postParams = http.getFormParams(page.toString(), "XXXXX@XXX.XX", "XXXXXXXX");

    // send a POST request for authentication
    http.sendPost(fb, postParams);

     // success then go to facebook.
     StringBuffer result = http.sendGet(fbResult);
     System.out.println(result);



  }

  private void sendPost(String url, String postParams) throws Exception {

    System.out.println("prepare POST   request");

    URL obj = new URL(url);
    conn = (HttpsURLConnection) obj.openConnection();

    // Acts like a browser
    conn.setUseCaches(false);
    conn.setRequestMethod("POST");
    conn.setRequestProperty("Host", "www.facebook.com");
    conn.setRequestProperty("User-Agent", USER_AGENT);
    conn.setRequestProperty("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
    conn.setRequestProperty("Accept-Language", "en-US,en;q=0.5");

    for (String cookie : this.cookies) {
      conn.addRequestProperty("Cookie", cookie);
    }
    conn.setRequestProperty("Connection", "keep-alive");
    conn.setRequestProperty("Referer", "https://www.facebook.com/");
    conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
    conn.setRequestProperty("Content-Length", Integer.toString(postParams.length()));

    conn.setDoOutput(true);
    conn.setDoInput(true);

    // Send post request
    DataOutputStream wr = new DataOutputStream(conn.getOutputStream());
    wr.writeBytes(postParams);
    wr.flush();
    wr.close();

    int responseCode = conn.getResponseCode();
    System.out.println("nSending 'POST' request to URL : " + url);
    System.out.println("Post parameters : " + postParams);
    System.out.println("Response Code : " + responseCode);

    // Get the response cookies
    setCookies(conn.getHeaderFields().get("Set-Cookie"));

    BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
    String inputLine;
    StringBuffer response = new StringBuffer();

    while ((inputLine = in.readLine()) != null) {
      response.append(inputLine);
    }
    in.close();

  }

  private StringBuffer sendGet(String url) throws Exception {
    System.out.println("prepare GET   request");
    URL obj = new URL(url);

    conn = (HttpsURLConnection) obj.openConnection();

    // default is GET
    conn.setRequestMethod("GET");

    conn.setUseCaches(false);

    // act like a browser
    conn.setRequestProperty("User-Agent", USER_AGENT);
    conn.setRequestProperty("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
    conn.setRequestProperty("Accept-Language", "en-US,en;q=0.5");

    if (cookies != null) {
      for (String cookie : this.cookies) {
        conn.addRequestProperty("Cookie", cookie.split(";", 1)[0]);
      }
    }

    int responseCode = conn.getResponseCode();
    System.out.println("nSending 'GET' request to URL : " + url);
    System.out.println("Response Code : " + responseCode);

    // Get the response cookies
    setCookies(conn.getHeaderFields().get("Set-Cookie"));

    BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
    String inputLine;
    StringBuffer response = new StringBuffer();

    while ((inputLine = in.readLine()) != null) {
      response.append(inputLine);
    }
    in.close();

    return response;

  }

  public String getFormParams(String html, String username, String password) throws UnsupportedEncodingException {

    System.out.println("Extracting form's data...");

    Document doc = Jsoup.parse(html);

    // Google form id
    Element loginform = doc.getElementById("login_form");
    Elements inputElements = loginform.getElementsByTag("input");
    List<String> paramList = new ArrayList<String>();
    for (Element inputElement : inputElements) {
      String key = inputElement.attr("name");
      String value = inputElement.attr("value");

      if (key.equals("email"))
        value = username;
      else if (key.equals("pass"))
        value = password;
      paramList.add(key + "=" + URLEncoder.encode(value, "UTF-8"));
    }

    // build parameters list
    StringBuilder result = new StringBuilder();
    for (String param : paramList) {
      if (result.length() == 0) {
        result.append(param);
      }
      else {
        result.append("&" + param);
      }
    }
    return result.toString();
  }

  public List<String> getCookies() {
    return cookies;
  }

  public void setCookies(List<String> cookies) {
    if (cookies != null)
      this.cookies = cookies;
  }

}