@WebListener()
@WebFilter(urlPatterns = {"*.html"})
public class HibernateContextListenerAndFilter implements Filter,ServletContextListener {
    
    @Override
    public void contextInitialized(ServletContextEvent sce) {
        HibernateUtil.buildSessionFactory();
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        try {
            HibernateUtil.openSessionAndBindToThread();
            filterChain.doFilter(servletRequest, servletResponse);
        } finally {
            HibernateUtil.closeSessionAndUnbindFromThread();
        }
    }

    @Override
    public void destroy() {
    }

    @Override
    public void contextDestroyed(ServletContextEvent sce) {
        HibernateUtil.closeSessionFactory();
    }
}