title: facebook login using java
body: <p>I am looking for a way to login to Facebook without a browser.</p>
  
  <ol>
  <li><p>I want to obtain the access token without a browser.</p></li>
  <li><p>Login is required in order to obtain the access token.</p></li>
  </ol>
  
  <p><strong>-Login Java examples</strong></p>
  
  <pre><code>import java.io.BufferedReader;
  import java.io.BufferedWriter;
  import java.io.DataOutputStream;
  import java.io.File;
  import java.io.FileWriter;
  import java.io.IOException;
  import java.io.InputStreamReader;
  import java.io.UnsupportedEncodingException;
  import java.net.CookieHandler;
  import java.net.CookieManager;
  import java.net.URL;
  import java.net.URLEncoder;
  import java.util.ArrayList;
  import java.util.List;
  
  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 HttpUrlConnectionExample {
  private List&lt;String&gt; cookies;
  private HttpsURLConnection conn;
  private final String USER_AGENT = "Mozilla/5.0";
  
  public static void main(String[] args) throws Exception {
      String url = "https://www.facebook.com/login.php?login_attempt=1";
      String facebook = "https://www.facebook.com/";
      HttpUrlConnectionExample http = new HttpUrlConnectionExample();
      // make sure cookies is turn on
      CookieHandler.setDefault(new CookieManager());
  
      // 1. Send a "GET" request, so that you can extract the form's data.
      String page = http.GetPageContent(url);
      String postParams = http.getFormParams(page, "sainstia@gmail.com", "1111");
  
      // 2. Construct above post's content and then send a POST request for
      // authentication
      http.sendPost(url, postParams);
  
      // 3. success then go to facebook.
      String result = http.GetPageContent(facebook);
      try {
          String content = result;
          File file = new File(".\\facebook_page.html");
          // if file doesnt exists, then create it
          if (!file.exists()) {
              file.createNewFile();
          }
          FileWriter fw = new FileWriter(file.getAbsoluteFile());
          BufferedWriter bw = new BufferedWriter(fw);
          bw.write(content);
          bw.close();
          System.out.println("Done");
  
      } catch (IOException e) {
          e.printStackTrace();
      }
  }
  
  private void sendPost(String url, String postParams) throws Exception {
      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,image/webp,*/*;q=0.8");
      conn.setRequestProperty("Accept-Language", "en-US,en;q=0.5");
      for (String cookie : this.cookies) {
          conn.addRequestProperty("Cookie", cookie.split(";", 1)[0]);
      }
      conn.setRequestProperty("Connection", "keep-alive");
      conn.setRequestProperty("Referer", "https://www.facebook.com/login.php?login_attempt=1");
      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);
      BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
      String inputLine;
      StringBuffer response = new StringBuffer();
      while ((inputLine = in.readLine()) != null) {
          response.append(inputLine);
      }
      in.close();
      // System.out.println(response.toString());
  }
  
  private String GetPageContent(String url) throws Exception {
      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,image/webp,*/*;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);
      BufferedReader in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
      String inputLine;
      StringBuffer response = new StringBuffer();
      while ((inputLine = in.readLine()) != null) {
          response.append(inputLine);
      }
      in.close();
      // Get the response cookies
      setCookies(conn.getHeaderFields().get("Set-Cookie"));
  
      return response.toString();
  }
  
  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&lt;String&gt; paramList = new ArrayList&lt;String&gt;();
      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("&amp;" + param);
          }
      }
      return result.toString();
  }
  
  public List&lt;String&gt; getCookies() {
      return cookies;
  }
  
  public void setCookies(List&lt;String&gt; cookies) {
      this.cookies = cookies;
  }
  }
  
  GetPageContent (String url) {
  .....
  .....
  
    setCookies (. conn.getHeaderFields () get ("Set-Cookie"));    
  ......
  }
  </code></pre>
  
  <p>I could not have a "Set-Cookie" value.</p>
  
  <p>I can not find the "Set-Cookie".</p>
  
  <p>What should I do to solve this problem?</p>