public class OracleJdbcTest
{
    String driverClass = "oracle.jdbc.driver.OracleDriver";

    Connection con;

    public void init(FileInputStream fs) throws ClassNotFoundException, SQLException, FileNotFoundException, IOException
    {
        Properties props = new Properties();
        props.load(fs);
        String url = props.getProperty("db.url");
        String userName = props.getProperty("db.user");
        String password = props.getProperty("db.password");
        Class.forName(driverClass);

        con=DriverManager.getConnection(url, userName, password);
    }

    public void fetch() throws SQLException, IOException
    {
        PreparedStatement ps = con.prepareStatement("select SYSDATE from dual");
        ResultSet rs = ps.executeQuery();

        while (rs.next())
        {
            // do the thing you do
        }
        rs.close();
        ps.close();
    }

    public static void main(String[] args)
    {
        OracleJdbcTest test = new OracleJdbcTest();
        test.init();
        test.fetch();
    }
}