在项目启动时（无 request）获取 Tomcat 端口号

package com.kowalski.demo;
import javax.management.MBeanServer;import javax.management.MalformedObjectNameException;import javax.management.ObjectName;import javax.management.Query;import java.lang.management.ManagementFactory;import java.net.InetAddress;import java.net.UnknownHostException;import java.util.Set;
public class IPAddressKowalski{    public static String getIpAddressAndPort() throws MalformedObjectNameException, NullPointerException,            UnknownHostException {        MBeanServer beanServer = ManagementFactory.getPlatformMBeanServer();        Set<ObjectName> objectNames = beanServer.queryNames(new ObjectName("*:type=Connector,*"),                Query.match(Query.attr("protocol"), Query.value("HTTP/1.1")));        String host = InetAddress.getLocalHost().getHostAddress();        String port = objectNames.iterator().next().getKeyProperty("port");        String ipadd = "http" + "://" + host + ":" + port;        System.out.println(ipadd);        return ipadd;    }
    public static int getTomcatPort() throws MalformedObjectNameException, NullPointerException {        MBeanServer beanServer = ManagementFactory.getPlatformMBeanServer();        Set<ObjectName> objectNames = beanServer.queryNames(new ObjectName("*:type=Connector,*"),                Query.match(Query.attr("protocol"), Query.value("HTTP/1.1")));        String port = objectNames.iterator().next().getKeyProperty("port");                return Integer.valueOf(port);    }}