java 在Jetty9中使用HttpSessionListener和Filter

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！

来源：http://blog.csdn.net/sidyhe/article/details/52084558