@WebServlet(value = "/sqlu")
public class MySQLServletUpdate extends HttpServlet {

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/plain; charset=utf-8");

        try{
            Driver driver = new com.mysql.cj.jdbc.Driver();
            DriverManager.registerDriver(driver);
            Connection connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/AppJEE?useSSL=false&characterEncoding=utf8&useJDBCCompianttimezoneShift=true&useLegacyDatetimecode=false&serverTimezone=UTC", "root", "password");

            PreparedStatement pstmt = connection.prepareStatement("INSERT INTO uzytkownik VALUES (null, ?, ?, ?)");
            pstmt.setString(1, "Zenon");
            pstmt.setString(2, "Zenonowy");
            pstmt.setString(3, "Zen");

            if (pstmt.executeUpdate() > 0) {
                response.getWriter().println("Rekord został dodany");
            }


        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

}