java 在Jetty9中使用HttpSessionListener和Filter

class MyHttpSessionListener implements HttpSessionListener {   @Override   public void sessionCreated(HttpSessionEvent httpSessionEvent) {     System.out.println("sessionCreated");   }    @Override   public void sessionDestroyed(HttpSessionEvent httpSessionEvent) {     System.out.println("sessionDestroyed");   } } 

ServletContextHandler.getSessionHandler().addEventListener(new MyHttpSessionListener()); 

class MyFilter implements Filter {    public MyFilter() {    }    @Override   public void init(FilterConfig filterConfig) throws ServletException {    }    @Override   public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {     if (servletRequest instanceof HttpServletRequest) {       HttpServletRequest httpRequest = (HttpServletRequest) servletRequest;        System.out.println(httpRequest.getServletPath());     }     filterChain.doFilter(servletRequest, servletResponse);   }    @Override   public void destroy() {    } } 

ServletContextHandler.addFilter(new FilterHolder(new MyFilter()), "/*", EnumSet.allOf(DispatcherType.class));