不通过request对象，在系统启动后，获取tomcat端口-优快云博客

本文链接：https://blog.youkuaiyun.com/iteye_17984/article/details/82673507

本文介绍了一种通过Java管理扩展（JMX）的方式获取Tomcat服务器正在使用的端口的方法。该方法通过查找并利用MBeanServer实例来查询Catalina MBean，进而获取到HTTP/1.1协议下Connector的端口号。

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private static String getPortByMBean() {
		String portStr = null;;

		MBeanServer mBeanServer = null;
		ArrayList<MBeanServer> mBeanServers = MBeanServerFactory.findMBeanServer(null);
		if (mBeanServers.size() > 0) {
			mBeanServer = mBeanServers.get(0);
		}
		if (mBeanServer == null) {
			throw new IllegalStateException("没有发现JVM中关联的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("没有发现JVM中关联的MBeanServer : " + mBeanServer.getDefaultDomain() + " 中的对象名称.");
		}
		try {
			for (ObjectName objectName : objectNames) {
				String protocol = (String) mBeanServer.getAttribute(objectName, "protocol");
				if (protocol.equals("HTTP/1.1")) {
					portStr = String.valueOf(mBeanServer.getAttribute(objectName, "port"));
					break;
				}

			}
		} catch (AttributeNotFoundException e) {
			e.printStackTrace();
		} catch (InstanceNotFoundException e) {
			e.printStackTrace();
		} catch (MBeanException e) {
			e.printStackTrace();
		} catch (ReflectionException e) {
			e.printStackTrace();
		}
		System.out.println("当前tomcat容器端口>>>"+portStr);
		return portStr;
	}