java獲取端口號，不用request

        Integer port = null;
        MBeanServer mBeanServer = null;
        List<MBeanServer> mBeanServers = MBeanServerFactory.findMBeanServer(null);
        if (mBeanServers.size() > 0) {
            for (MBeanServer _mBeanServer : mBeanServers) {
                mBeanServer = _mBeanServer;
                break;
            }
        }
        if (mBeanServer == null) {
            throw new IllegalStateException("沒有發現JVM中關聯的MBeanServer.");
        }
        Set<ObjectName> objectNames = null;
        try {
            objectNames = mBeanServer.queryNames(new ObjectName("Catalina:type=Connector,*"), null);
        } catch (MalformedObjectNameException e) {
            e.printStackTrace();
        } catch (NullPointerException e) {
            e.printStackTrace();
        }
        if (objectNames == null || objectNames.size() <= 0) {
            throw new IllegalStateException("沒有發現JVM中關聯的MBeanServer : "
                    + mBeanServer.getDefaultDomain() + " 中的對象名稱.");
        }
        try {
            for (ObjectName objectName : objectNames) {
                String protocol = (String) mBeanServer.getAttribute(objectName, "protocol");
                if (protocol.equals("HTTP/1.1")) {
                    port = (Integer) mBeanServer.getAttribute(objectName, "port");
                }
            }
        } catch (AttributeNotFoundException e) {
            e.printStackTrace();
        } catch (InstanceNotFoundException e) {
            e.printStackTrace();
        } catch (MBeanException e) {
            e.printStackTrace();
        } catch (ReflectionException e) {
            e.printStackTrace();
        }