public class LoginActivity extends Activity{

  HttpURLConnection connection;
  EditText text_identifier;
  EditText text_password;

  /* Some source code that calls connect()*/
  private boolean connect() throws IOException{
    StringBuilder sb = new StringBuilder("");
    sb.append("username=").append(text_identifier.getText());
    sb.append("&password=").append(text_password.getText());
    String urlParameters  = sb.toString();
    byte[] postData       = urlParameters.getBytes(StandardCharsets.UTF_8);
    int    postDataLength = postData.length;
    String request        = "http://serverIPAdress:8080/MyProject/login";
    URL url = new URL(request);
    connection = (HttpURLConnection) url.openConnection();
    connection.setConnectTimeout(3000);
    connection.setRequestMethod("POST");
    connection.setDoOutput(true);
    connection.setInstanceFollowRedirects(false);
    connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
    connection.setRequestProperty("charset", "utf-8");
    connection.setRequestProperty("Content-Length", Integer.toString( postDataLength));
    connection.setUseCaches(false);
    OutputStream output = null;
    try {
        output = connection.getOutputStream();
        output.write(postData);
    } finally{
        output.close();
    }
        InputStream response = connection.getInputStream();
        String myString = IOUtils.toString(response, "UTF-8");
        if(myString.equals("true"))
            return true;
        else
            return false;
  }
}