java 在Jetty9中使用HttpSessionListener和Filter

HttpSessionListener

当Session创建或销毁的时候被调用

示例代码:

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

注册方法:

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

注意: 若整个请求中都没有用到Session, 则不会生成它, 也不会调用Listener

Filter

当客户端请求数据时被调用

示例代码:

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() { } }

注册方法:

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

注意: 若请求的路径错误, 则不会触发Filter

感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！