有时需要在当前代码中获取当前Server实例的端口号, 通过HttpServletRequest请求可以, 但有时也需要在没有请求的情况下获取到端口号.

用以下方法是可以获取到的:

public int getHttpPort() {    try {        MBeanServer server;        if (MBeanServerFactory.findMBeanServer(null).size() > 0) {            server = MBeanServerFactory.findMBeanServer(null).get(0);        } else {            log.error("no MBeanServer!");            return -1;        }        Set names = server.queryNames(new ObjectName("Catalina:type=Connector,*"),                Query.match(Query.attr("protocol"), Query.value("HTTP/1.1")));        Iterator iterator = names.iterator();        if (iterator.hasNext()) {            ObjectName name = (ObjectName) iterator.next();            return Integer.parseInt(server.getAttribute(name, "port").toString());        }    } catch (Exception e) {        log.error("getHttpPort", e);    }    return -1;}