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
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