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XMPP即时通讯协议使用（三）——订阅发布、断开重连与PingXMPP中的订阅流程

package com.testV3;

import java.util.List;

import org.jivesoftware.smack.ConnectionListener;
import org.jivesoftware.smack.SmackException.NoResponseException;
import org.jivesoftware.smack.SmackException.NotConnectedException;
import org.jivesoftware.smack.XMPPConnection;
import org.jivesoftware.smack.XMPPException.XMPPErrorException;
import org.jivesoftware.smack.packet.Presence;
import org.jivesoftware.smack.tcp.XMPPTCPConnection;
import org.jivesoftware.smack.tcp.XMPPTCPConnectionConfiguration;
import org.jivesoftware.smackx.pubsub.ItemPublishEvent;
import org.jivesoftware.smackx.pubsub.LeafNode;
import org.jivesoftware.smackx.pubsub.PayloadItem;
import org.jivesoftware.smackx.pubsub.PubSubManager;
import org.jivesoftware.smackx.pubsub.SubscribeForm;
import org.jivesoftware.smackx.pubsub.Subscription;
import org.jivesoftware.smackx.pubsub.listener.ItemEventListener;
import org.jivesoftware.smackx.xdata.packet.DataForm;
import org.jxmpp.jid.parts.Resourcepart;

public class SubscribeThread extends Thread {

	private String[] nodeId;

	private String userName;

	private String password;

	private String xmppDomain;

	private String serverName;

	private XMPPTCPConnection connection;

	private ItemEventListener<PayloadItem> myInterface;

	/**
	 * 
	 * @param userName
	 * @param password
	 * @param xmppDomain
	 * @param serverName
	 * @param nodeId
	 *            监听节点集合
	 */
	public SubscribeThread(String userName, String password, String xmppDomain, String serverName, String[] nodeId) {
		this.userName = userName;
		this.password = password;
		this.xmppDomain = xmppDomain;
		this.serverName = serverName;
		this.nodeId = nodeId;
		try {
			if (connection == null) {
				getConnection(userName, password, xmppDomain, serverName);
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * 
	 * @param userName
	 * @param password
	 * @param xmppDomain
	 * @param serverName
	 * @param nodeId
	 *            监听节点集合
	 * @param myInterface
	 *            监听数据处理接口
	 */
	public SubscribeThread(String userName, String password, String xmppDomain, String serverName, String[] nodeId,
			ItemEventListener myInterface) {
		this.userName = userName;
		this.password = password;
		this.xmppDomain = xmppDomain;
		this.serverName = serverName;
		this.nodeId = nodeId;
		this.myInterface = myInterface;
		try {
			if (connection == null) {
				getConnection(userName, password, xmppDomain, serverName);
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * 获取连接
	 * 
	 * @param userName
	 * @param password
	 * @param xmppDomain
	 * @param serverName
	 */
	public void getConnection(String userName, String password, String xmppDomain, String serverName) {
		try {
			XMPPTCPConnectionConfiguration.Builder configBuilder = XMPPTCPConnectionConfiguration.builder();
			configBuilder.setHost(xmppDomain);
			configBuilder.setPort(5222);
			configBuilder.setUsernameAndPassword(userName, password);
			configBuilder.setXmppDomain(xmppDomain);
			/*Resourcepart resource = Resourcepart.from("pc");
			configBuilder.setResource(resource);*/
			configBuilder.setSendPresence(true);
			//configBuilder.setSendPresence(false);// 状态设为离线，目的为了取离线消息 
			configBuilder.setDebuggerEnabled(true);//设置Debugger模式
			configBuilder.setSecurityMode(XMPPTCPConnectionConfiguration.SecurityMode.disabled);
			
			connection = new XMPPTCPConnection(configBuilder.build());
			connection.addConnectionListener(new MyConnectionListener(connection, nodeId, myInterface));
			// 连接服务器
			connection.connect();
			
			// 登录服务器
			connection.login();
			/*Presence presence = new Presence(Presence.Type.available);  
			connection.sendPacket(presence);  */
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public void run() {
		while (true) {

		}
	}
}
           
package com.testV3;

import java.io.IOException;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;

import org.jivesoftware.smack.AbstractXMPPConnection;
import org.jivesoftware.smack.ConnectionListener;
import org.jivesoftware.smack.SmackException;
import org.jivesoftware.smack.SmackException.NotConnectedException;
import org.jivesoftware.smack.StanzaListener;
import org.jivesoftware.smack.XMPPConnection;
import org.jivesoftware.smack.XMPPException;
import org.jivesoftware.smack.filter.StanzaFilter;
import org.jivesoftware.smack.packet.Message;
import org.jivesoftware.smack.packet.Presence;
import org.jivesoftware.smack.packet.Stanza;
import org.jivesoftware.smack.packet.StreamError;
import org.jivesoftware.smack.packet.XMPPError;
import org.jivesoftware.smack.tcp.XMPPTCPConnection;
import org.jivesoftware.smackx.ping.PingFailedListener;
import org.jivesoftware.smackx.pubsub.ConfigurationEvent;
import org.jivesoftware.smackx.pubsub.ItemPublishEvent;
import org.jivesoftware.smackx.pubsub.LeafNode;
import org.jivesoftware.smackx.pubsub.PayloadItem;
import org.jivesoftware.smackx.pubsub.PubSubManager;
import org.jivesoftware.smackx.pubsub.SubscribeForm;
import org.jivesoftware.smackx.pubsub.Subscription;
import org.jivesoftware.smackx.pubsub.listener.ItemEventListener;
import org.jivesoftware.smackx.pubsub.listener.NodeConfigListener;
import org.jivesoftware.smackx.xdata.packet.DataForm;
import org.jxmpp.jid.parts.Resourcepart;

public class MyConnectionListener implements ConnectionListener, PingFailedListener {

	private String[] nodeId;

	private XMPPTCPConnection connection;

	private ItemEventListener myInterface;

	private boolean subscribed = false; // 是否已注册监听订阅事件

	private Timer tReconn;

	private int logintime = 30 * 1000;

	class ReconnTimetask extends TimerTask {
		@Override
		public void run() {
			if (!connection.isConnected() || !connection.isAuthenticated()) {
				System.out.println("断开重连...");
				connection.disconnect();
				// 连接服务器
				try {
					connection.connect();
					// 登录服务器
					connection.login();
					Presence presence = new Presence(Presence.Type.available);
					connection.sendPacket(presence);
				} catch (Exception e) {
					connectionClosed();//异常，未连接，进行重连
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}
	}

	class PingTimetask extends TimerTask {
		@Override
		public void run() {
			if (connection.isConnected() && connection.isAuthenticated()) {
				Presence presence = new Presence(Presence.Type.available);
				try {
					connection.sendPacket(presence);
				} catch (Exception e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}
	}

	public MyConnectionListener(XMPPTCPConnection connection, String[] nodeId) {
		this.connection = connection;
		this.nodeId = nodeId;
	}

	public MyConnectionListener(XMPPTCPConnection connection, String[] nodeId, ItemEventListener myInterface) {
		this.connection = connection;
		this.nodeId = nodeId;
		this.myInterface = myInterface;
	}

	public void connected(XMPPConnection connection) {
		// TODO Auto-generated method stub
		System.out.println("connection");
	}

	public void authenticated(final XMPPConnection connection, boolean resumed) {
		// TODO Auto-generated method stub
		System.out.println("authenticated");

		try {
			// 已注册监听之后就避免重复注册，防止重复监听
			if (!subscribed) {
				subscribed = true;

				// 添加订阅监听
				if (myInterface == null) {
					subscribeListener(nodeId, new MyItemEventListener());
				} else {
					subscribeListener(nodeId, myInterface);
				}

				MyPingManager.setDefaultPingInterval(30);// Ping every 30 seconds
				MyPingManager myPingManager = MyPingManager.getInstanceFor(connection);
				// Set PingListener here to catch connect status
				myPingManager.registerPingFailedListener(MyConnectionListener.this);

				// 添加接受数据监听
				connection.addAsyncStanzaListener(new StanzaListener() {
					public void processStanza(Stanza packet) throws NotConnectedException, InterruptedException {
						// TODO Auto-generated method stub
						System.out.println("截获的内容：" + packet.toXML());
						if (packet instanceof Presence) {
							Presence presence = (Presence) packet;
							System.out.println("在线状态：" + presence.getType());
							if (presence.getType().equals(Presence.Type.unavailable)) {// 证明已掉线
								tReconn = new Timer();
								tReconn.schedule(new ReconnTimetask(), logintime);
							}
						}
					}
				}, new StanzaFilter() {
					public boolean accept(Stanza stanza) {
						// TODO Auto-generated method stub
						return true;
					}
				});
			}
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

	public void connectionClosed() {
		// TODO Auto-generated method stub
		System.out.println("connectionClosed");

		try {
			tReconn = new Timer();
			tReconn.schedule(new ReconnTimetask(), logintime);
		} catch (Exception e) {
			e.printStackTrace();
		}

	}

	public void connectionClosedOnError(Exception e) {
		// TODO Auto-generated method stub
		System.out.println("connectionClosedOnError");

		try {
			tReconn = new Timer();
			tReconn.schedule(new ReconnTimetask(), logintime);
		} catch (Exception ee) {
			e.printStackTrace();
			ee.printStackTrace();
		}
	}

	public void reconnectionSuccessful() {
		// TODO Auto-generated method stub
		System.out.println("reconnectionSuccessful");
	}

	public void reconnectingIn(int seconds) {
		// TODO Auto-generated method stub
		System.out.println("reconnectingIn");
	}

	public void reconnectionFailed(Exception e) {
		// TODO Auto-generated method stub
		System.out.println("reconnectionFailed");
	}

	/**
	 * 订阅节点监听及数据处理
	 * 
	 * @param nodeId
	 * @param myItemEventListener
	 * @throws Exception
	 */
	public void subscribeListener(String[] nodeId, ItemEventListener<PayloadItem> myItemEventListener)
			throws Exception {
		PubSubManager mgr = PubSubManager.getInstance(connection);
		if (nodeId != null && nodeId.length > 0) {
			for (String id : nodeId) {
				// Get the node
				LeafNode node = null;

				node = mgr.getNode(id);

				SubscribeForm subscriptionForm = new SubscribeForm(DataForm.Type.submit);
				subscriptionForm.setDeliverOn(true);
				subscriptionForm.setDigestFrequency(5000);
				subscriptionForm.setDigestOn(true);
				subscriptionForm.setIncludeBody(true);

				if (myItemEventListener != null) {
					node.removeItemEventListener(myItemEventListener);
					node.addItemEventListener(myItemEventListener);
				} else {

					myItemEventListener = new ItemEventListener<PayloadItem>() {
						public void handlePublishedItems(ItemPublishEvent<PayloadItem> items) {
							List<PayloadItem> list = (List<PayloadItem>) items.getItems();
							for (PayloadItem item : list) {
								System.out.println("订阅消息内容：" + item.getPayload().toXML());
							}
						}
					};

					node.removeItemEventListener(myItemEventListener);
					node.addItemEventListener(myItemEventListener);
				}

				List<Subscription> subscriptions = node.getSubscriptions();

				boolean flag = true;
				if (subscriptions != null && subscriptions.size() > 0) {
					for (Subscription s : subscriptions) {
						if (s.getJid().toLowerCase()
								.equals(connection.getUser().asEntityBareJidString().toLowerCase())) {// 已订阅过
							flag = false;
							break;
						}
					}
				}
				if (flag) {// 未订阅，开始订阅
					node.subscribe(connection.getUser().asEntityBareJidString(), subscriptionForm);
				}
			}
		}
	}

	public void pingFailed() {
		// TODO Auto-generated method stub
		if (connection.isConnected()) {
			connection.disconnect();
		}
		tReconn = new Timer();
		tReconn.schedule(new ReconnTimetask(), logintime);
	}
}
           
package com.testV3;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;

import org.jivesoftware.smackx.pubsub.ItemPublishEvent;
import org.jivesoftware.smackx.pubsub.PayloadItem;
import org.jivesoftware.smackx.pubsub.listener.ItemEventListener;

class MyItemEventListener implements ItemEventListener<PayloadItem> {
	public void handlePublishedItems(ItemPublishEvent<PayloadItem> items) {
		List<PayloadItem> list = (List<PayloadItem>) items.getItems();
		for (PayloadItem item : list) {
			Date d = new Date();
			SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
			//System.out.println("当前时间：" + sdf.format(d));
			System.out.println(sdf.format(d)+"，订阅消息内容：" + item.getPayload().toXML());
		}
	}
}
           
package com.testV3;

/**
*
* Copyright 2012-2015 Florian Schmaus
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

import java.util.Collections;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.WeakHashMap;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
import java.util.logging.Level;
import java.util.logging.Logger;

import org.jivesoftware.smack.AbstractConnectionClosedListener;
import org.jivesoftware.smack.SmackException;
import org.jivesoftware.smack.SmackException.NoResponseException;
import org.jivesoftware.smack.SmackException.NotConnectedException;
import org.jivesoftware.smack.XMPPConnection;
import org.jivesoftware.smack.ConnectionCreationListener;
import org.jivesoftware.smack.Manager;
import org.jivesoftware.smack.XMPPConnectionRegistry;
import org.jivesoftware.smack.XMPPException;
import org.jivesoftware.smack.XMPPException.XMPPErrorException;
import org.jivesoftware.smack.iqrequest.AbstractIqRequestHandler;
import org.jivesoftware.smack.iqrequest.IQRequestHandler.Mode;
import org.jivesoftware.smack.packet.IQ;
import org.jivesoftware.smack.packet.IQ.Type;
import org.jivesoftware.smack.util.SmackExecutorThreadFactory;
import org.jivesoftware.smackx.disco.ServiceDiscoveryManager;
import org.jivesoftware.smackx.ping.PingFailedListener;
import org.jivesoftware.smackx.ping.packet.Ping;
import org.jxmpp.jid.DomainBareJid;
import org.jxmpp.jid.Jid;

/**
 * Implements the XMPP Ping as defined by XEP-0199. The XMPP Ping protocol
 * allows one entity to ping any other entity by simply sending a ping to the
 * appropriate JID. PingManger also periodically sends XMPP pings to the server
 * to avoid NAT timeouts and to test the connection status.
 * <p>
 * The default server ping interval is 30 minutes and can be modified with
 * {@link #setDefaultPingInterval(int)} and {@link #setPingInterval(int)}.
 * </p>
 * 
 * @author Florian Schmaus
 * @see <a href="http://www.xmpp.org/extensions/xep-0199.html" target="_blank" rel="external nofollow" >XEP-0199:XMPP
 *      Ping</a>
 */
public class MyPingManager extends Manager {
	private static final Logger LOGGER = Logger.getLogger(MyPingManager.class.getName());

	private static final Map<XMPPConnection, MyPingManager> INSTANCES = new WeakHashMap<XMPPConnection, MyPingManager>();

	static {
		XMPPConnectionRegistry.addConnectionCreationListener(new ConnectionCreationListener() {
			public void connectionCreated(XMPPConnection connection) {
				getInstanceFor(connection);
			}
		});
	}

	/**
	 * Retrieves a {@link MyPingManager} for the specified {@link XMPPConnection},
	 * creating one if it doesn't already exist.
	 * 
	 * @param connection
	 *            The connection the manager is attached to.
	 * @return The new or existing manager.
	 */
	public static MyPingManager getInstanceFor(XMPPConnection connection) {
		MyPingManager MyPingManager = INSTANCES.get(connection);
		if (MyPingManager == null) {
			MyPingManager = new MyPingManager(connection);
			INSTANCES.put(connection, MyPingManager);
		}
		return MyPingManager;
	}

	/**
	 * The default ping interval in seconds used by new MyPingManager instances. The
	 * default is 30 minutes.
	 */
	private static int defaultPingInterval = 60 * 30;

	/**
	 * Set the default ping interval which will be used for new connections.
	 *
	 * @param interval
	 *            the interval in seconds
	 */
	public static void setDefaultPingInterval(int interval) {
		defaultPingInterval = interval;
	}

	private final Set<PingFailedListener> pingFailedListeners = Collections
			.synchronizedSet(new HashSet<PingFailedListener>());

	private final ScheduledExecutorService executorService;

	/**
	 * The interval in seconds between pings are send to the users server.
	 */
	private int pingInterval = defaultPingInterval;

	private ScheduledFuture<?> nextAutomaticPing;

	private MyPingManager(XMPPConnection connection) {
		super(connection);
		executorService = Executors
				.newSingleThreadScheduledExecutor(new SmackExecutorThreadFactory(connection, "Ping"));
		ServiceDiscoveryManager sdm = ServiceDiscoveryManager.getInstanceFor(connection);
		sdm.addFeature(Ping.NAMESPACE);

		connection.registerIQRequestHandler(
				new AbstractIqRequestHandler(Ping.ELEMENT, Ping.NAMESPACE, Type.get, Mode.async) {
					@Override
					public IQ handleIQRequest(IQ iqRequest) {
						Ping ping = (Ping) iqRequest;
						return ping.getPong();
					}
				});
		connection.addConnectionListener(new AbstractConnectionClosedListener() {
			@Override
			public void authenticated(XMPPConnection connection, boolean resumed) {
				maybeSchedulePingServerTask();
			}

			@Override
			public void connectionTerminated() {
				maybeStopPingServerTask();
			}
		});
		maybeSchedulePingServerTask();
	}

	/**
	 * Pings the given jid. This method will return false if an error occurs. The
	 * exception to this, is a server ping, which will always return true if the
	 * server is reachable, event if there is an error on the ping itself (i.e. ping
	 * not supported).
	 * <p>
	 * Use {@link #isPingSupported(String)} to determine if XMPP Ping is supported
	 * by the entity.
	 * 
	 * @param jid
	 *            The id of the entity the ping is being sent to
	 * @param pingTimeout
	 *            The time to wait for a reply in milliseconds
	 * @return true if a reply was received from the entity, false otherwise.
	 * @throws NoResponseException
	 *             if there was no response from the jid.
	 * @throws NotConnectedException
	 */
	public boolean ping(DomainBareJid jid, long pingTimeout) throws NotConnectedException, NoResponseException {
		final XMPPConnection connection = connection();
		// Packet collector for IQs needs an connection that was at least authenticated
		// once,
		// otherwise the client JID will be null causing an NPE
		if (!connection.isAuthenticated()) {
			throw new NotConnectedException();
		}
		Ping ping = new Ping(jid);
		try {
			connection.createStanzaCollectorAndSend(ping).nextResultOrThrow(pingTimeout);
		} catch (XMPPException exc) {
			return jid.equals(connection.getServiceName());
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return true;
	}

	/**
	 * Same as calling {@link #ping(String, long)} with the defaultpacket reply
	 * timeout.
	 * 
	 * @param jid
	 *            The id of the entity the ping is being sent to
	 * @return true if a reply was received from the entity, false otherwise.
	 * @throws NotConnectedException
	 * @throws NoResponseException
	 *             if there was no response from the jid.
	 */
	public boolean ping(DomainBareJid jid) throws NotConnectedException, NoResponseException {
		return ping(jid, connection().getPacketReplyTimeout());
	}

	/**
	 * Query the specified entity to see if it supports the Ping protocol (XEP-0199)
	 * 
	 * @param jid
	 *            The id of the entity the query is being sent to
	 * @return true if it supports ping, false otherwise.
	 * @throws XMPPErrorException
	 *             An XMPP related error occurred during the request
	 * @throws NoResponseException
	 *             if there was no response from the jid.
	 * @throws NotConnectedException
	 */
	public boolean isPingSupported(Jid jid) throws NoResponseException, XMPPErrorException, NotConnectedException,InterruptedException {
		return ServiceDiscoveryManager.getInstanceFor(connection()).supportsFeature(jid, Ping.NAMESPACE);
	}

	/**
	 * Pings the server. This method will return true if the server is reachable. It
	 * is the equivalent of calling <code>ping</code> with the XMPP domain.
	 * <p>
	 * Unlike the {@link #ping(String)} case, this method will return true even if
	 * {@link #isPingSupported(String)} is false.
	 * 
	 * @return true if a reply was received from the server, false otherwise.
	 * @throws NotConnectedException
	 */
	public boolean pingMyServer() throws NotConnectedException {
		return pingMyServer(true);
	}

	/**
	 * Pings the server. This method will return true if the server is reachable. It
	 * is the equivalent of calling <code>ping</code> with the XMPP domain.
	 * <p>
	 * Unlike the {@link #ping(String)} case, this method will return true even if
	 * {@link #isPingSupported(String)} is false.
	 *
	 * @param notifyListeners
	 *            Notify the PingFailedListener in case of error if true
	 * @return true if the user's server could be pinged.
	 * @throws NotConnectedException
	 */
	public boolean pingMyServer(boolean notifyListeners) throws NotConnectedException {
		return pingMyServer(notifyListeners, connection().getPacketReplyTimeout());
	}

	/**
	 * Pings the server. This method will return true if the server is reachable. It
	 * is the equivalent of calling <code>ping</code> with the XMPP domain.
	 * <p>
	 * Unlike the {@link #ping(String)} case, this method will return true even if
	 * {@link #isPingSupported(String)} is false.
	 *
	 * @param notifyListeners
	 *            Notify the PingFailedListener in case of error if true
	 * @param pingTimeout
	 *            The time to wait for a reply in milliseconds
	 * @return true if the user's server could be pinged.
	 * @throws NotConnectedException
	 */
	public boolean pingMyServer(boolean notifyListeners, long pingTimeout) throws NotConnectedException {
		boolean res;
		try {
			res = ping(connection().getServiceName(), pingTimeout);
		} catch (NoResponseException e) {
			res = false;
		}
		if (!res && notifyListeners) {
			for (PingFailedListener l : pingFailedListeners)
				l.pingFailed();
		}
		return res;
	}

	/**
	 * Set the interval in seconds between a automated server ping is send. A
	 * negative value disables automatic server pings. All settings take effect
	 * immediately. If there is an active scheduled server ping it will be canceled
	 * and, if <code>pingInterval</code> is positive, a new one will be scheduled in
	 * pingInterval seconds.
	 * <p>
	 * If the ping fails after 3 attempts waiting the connections reply timeout for
	 * an answer, then the ping failed listeners will be invoked.
	 * </p>
	 *
	 * @param pingInterval
	 *            the interval in seconds between the automated server pings
	 */
	public void setPingInterval(int pingInterval) {
		this.pingInterval = pingInterval;
		maybeSchedulePingServerTask();
	}

	/**
	 * Get the current ping interval.
	 *
	 * @return the interval between pings in seconds
	 */
	public int getPingInterval() {
		return pingInterval;
	}

	/**
	 * Register a new PingFailedListener
	 *
	 * @param listener
	 *            the listener to invoke
	 */
	public void registerPingFailedListener(PingFailedListener listener) {
		pingFailedListeners.add(listener);
	}

	/**
	 * Unregister a PingFailedListener
	 *
	 * @param listener
	 *            the listener to remove
	 */
	public void unregisterPingFailedListener(PingFailedListener listener) {
		pingFailedListeners.remove(listener);
	}

	private void maybeSchedulePingServerTask() {
		maybeSchedulePingServerTask(0);
	}

	/**
	 * Cancels any existing periodic ping task if there is one and schedules a new
	 * ping task if pingInterval is greater then zero.
	 *
	 * @param delta
	 *            the delta to the last received stanza in seconds
	 */
	private void maybeSchedulePingServerTask(int delta) {
		maybeStopPingServerTask();
		if (pingInterval > 0) {
			int nextPingIn = pingInterval - delta;
			LOGGER.fine("Scheduling ServerPingTask in " + nextPingIn + " seconds (pingInterval=" + pingInterval
					+ ", delta=" + delta + ")");
			nextAutomaticPing = executorService.schedule(pingServerRunnable, nextPingIn, TimeUnit.SECONDS);
		}
	}

	private void maybeStopPingServerTask() {
		if (nextAutomaticPing != null) {
			nextAutomaticPing.cancel(true);
			nextAutomaticPing = null;
		}
	}

	/**
	 * Ping the server if deemed necessary because automatic server pings are
	 * enabled ({@link #setPingInterval(int)}) and the ping interval has expired.
	 */
	public void pingServerIfNecessary() {
		final int DELTA = 1000; // 1 seconds
		final int TRIES = 3; // 3 tries
		final XMPPConnection connection = connection();
		// final XMPPConnection connection = this.connection;
		if (connection == null) {
			// connection has been collected by GC
			// which means we can stop the thread by breaking the loop
			return;
		}
		if (pingInterval <= 0) {
			// Ping has been disabled
			return;
		}
		long lastStanzaReceived = connection.getLastStanzaReceived();
		if (lastStanzaReceived > 0) {
			long now = System.currentTimeMillis();
			// Delta since the last stanza was received
			int deltaInSeconds = (int) ((now - lastStanzaReceived) / 1000);
			// If the delta is small then the ping interval, then we can defer the ping
			if (deltaInSeconds < pingInterval) {
				maybeSchedulePingServerTask(deltaInSeconds);
				return;
			}
		}
		if (connection.isAuthenticated()) {
			boolean res = false;

			for (int i = 0; i < TRIES; i++) {
				if (i != 0) {
					try {
						Thread.sleep(DELTA);
					} catch (InterruptedException e) {
						// We received an interrupt
						// This only happens if we should stop pinging
						return;
					}
				}
				try {
					res = pingMyServer(false);
					/* Log.i("XMPP Ping", "result:"+res); */
				} catch (SmackException e) {
					LOGGER.log(Level.WARNING, "SmackError while pinging server", e);
					res = false;
				}
				// stop when we receive a pong back
				if (res) {
					break;
				}
			}
			if (!res) {
				for (PingFailedListener l : pingFailedListeners) {
					l.pingFailed();
				}
			} else {
				// Ping was successful, wind-up the periodic task again
				maybeSchedulePingServerTask();
			}
		} else {
			LOGGER.warning("XMPPConnection was not authenticated");
		}
	}

	private final Runnable pingServerRunnable = new Runnable() {
		public void run() {
			LOGGER.fine("ServerPingTask run()");
			pingServerIfNecessary();
		}
	};

	@Override
	protected void finalize() throws Throwable {
		LOGGER.fine("finalizing MyPingManager: Shutting down executor service");
		try {
			executorService.shutdown();
		} catch (Throwable t) {
			LOGGER.log(Level.WARNING, "finalize() threw throwable", t);
		} finally {
			super.finalize();
		}
	}
}
           
package com.testV3;

public class Test3 {

	final static String USERNAME = "gm";

	final static String PASSWORD = "123456";

	final static String XMPPDOMAIN = "172.19.12.240";

	final static String SERVERNAME = "pc-20170308pkrs";
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		String[] nodeId = {"/BAGGL/GJXX/LCGJ","/BAGGL/GJXX/TLGJ"};
		SubscribeThread smark = new SubscribeThread(USERNAME,PASSWORD,XMPPDOMAIN,SERVERNAME,nodeId,new MyItemEventListener());
		
		smark.start();
		
	}

}

XMPP中的订阅流程

1、首先，需要确认你的服务器支持pubsub特性

1.1  查询XMPP服务的所有服务

<?xml version="1.0" encoding="utf-8"?>

<iq to="pc-20170308pkrs" id="3EV56-7" type="get">
  <query xmlns="http://jabber.org/protocol/disco#info"></query>
</iq>

返回：

<?xml version="1.0" encoding="utf-8"?>

<iq type="result" id="3EV56-7" from="pc-20170308pkrs" to="[email protected]/pc">
  <query xmlns="http://jabber.org/protocol/disco#info">
    <identity category="server" name="Openfire Server" type="im"/>
    <identity category="pubsub" type="pep"/>
    <feature var="http://jabber.org/protocol/pubsub#retrieve-default"/>
    <feature var="http://jabber.org/protocol/pubsub#purge-nodes"/>
    <feature var="vcard-temp"/>
    <feature var="http://jabber.org/protocol/pubsub#subscribe"/>
    <feature var="http://jabber.org/protocol/pubsub#subscription-options"/>
    <feature var="http://jabber.org/protocol/pubsub#create-nodes"/>
    <feature var="http://jabber.org/protocol/pubsub#outcast-affiliation"/>
    <feature var="msgoffline"/>
    <feature var="http://jabber.org/protocol/pubsub#get-pending"/>
    <feature var="http://jabber.org/protocol/pubsub#multi-subscribe"/>
    <feature var="http://jabber.org/protocol/pubsub#presence-notifications"/>
    <feature var="urn:xmpp:ping"/>
    <feature var="jabber:iq:register"/>
    <feature var="http://jabber.org/protocol/pubsub#delete-nodes"/>
    <feature var="http://jabber.org/protocol/pubsub#config-node"/>
    <feature var="http://jabber.org/protocol/pubsub#retrieve-items"/>
    <feature var="http://jabber.org/protocol/pubsub#auto-create"/>
    <feature var="http://jabber.org/protocol/disco#items"/>
    <feature var="http://jabber.org/protocol/pubsub#item-ids"/>
    <feature var="http://jabber.org/protocol/pubsub#meta-data"/>
    <feature var="jabber:iq:roster"/>
    <feature var="http://jabber.org/protocol/pubsub#instant-nodes"/>
    <feature var="http://jabber.org/protocol/pubsub#modify-affiliations"/>
    <feature var="http://jabber.org/protocol/pubsub#persistent-items"/>
    <feature var="http://jabber.org/protocol/pubsub#create-and-configure"/>
    <feature var="http://jabber.org/protocol/pubsub"/>
    <feature var="http://jabber.org/protocol/pubsub#publisher-affiliation"/>
    <feature var="http://jabber.org/protocol/pubsub#access-open"/>
    <feature var="http://jabber.org/protocol/pubsub#retrieve-affiliations"/>
    <feature var="jabber:iq:version"/>
    <feature var="http://jabber.org/protocol/pubsub#retract-items"/>
    <feature var="urn:xmpp:time"/>
    <feature var="http://jabber.org/protocol/pubsub#manage-subscriptions"/>
    <feature var="jabber:iq:privacy"/>
    <feature var="jabber:iq:last"/>
    <feature var="http://jabber.org/protocol/commands"/>
    <feature var="http://jabber.org/protocol/offline"/>
    <feature var="urn:xmpp:carbons:2"/>
    <feature var="http://jabber.org/protocol/address"/>
    <feature var="http://jabber.org/protocol/pubsub#publish"/>
    <feature var="http://jabber.org/protocol/pubsub#collections"/>
    <feature var="http://jabber.org/protocol/pubsub#retrieve-subscriptions"/>
    <feature var="http://jabber.org/protocol/disco#info"/>
    <feature var="jabber:iq:private"/>
    <feature var="http://jabber.org/protocol/rsm"/>
  </query>
</iq>

1.2 查询发布订阅中的某一个持久化的叶子节点

<?xml version="1.0" encoding="utf-8"?>

<iq to="pubsub.pc-20170308pkrs" id="3EV56-9" type="get">
  <query xmlns="http://jabber.org/protocol/disco#info" node="/BAGGL/GJXX/LCGJ"></query>
</iq>

返回

<?xml version="1.0" encoding="utf-8"?>

<iq type="result" id="3EV56-9" from="pubsub.pc-20170308pkrs" to="[email protected]/pc">
  <query xmlns="http://jabber.org/protocol/disco#info" node="/BAGGL/GJXX/LCGJ">
    <identity category="pubsub" type="leaf"/>
    <feature var="http://jabber.org/protocol/pubsub"/>
    <feature var="http://jabber.org/protocol/disco#info"/>
    <x xmlns="jabber:x:data" type="result">
      <field var="FORM_TYPE" type="hidden">
        <value>http://jabber.org/protocol/pubsub#meta-data</value>
      </field>
      <field var="pubsub#title" type="text-single" label="Short name for the node">
        <value>流程告警</value>
      </field>
      <field var="pubsub#description" type="text-single" label="Description of the node">
        <value></value>
      </field>
      <field var="pubsub#node_type" type="text-single" label="Whether the node is a leaf (default) or a collection">
        <value>leaf</value>
      </field>
      <field var="pubsub#collection" type="text-single" label="The collection with which a node is affiliated."/>
      <field var="pubsub#subscribe" type="boolean" label="Allow subscriptions to node">
        <value>1</value>
      </field>
      <field var="pubsub#subscription_required" type="boolean" label="New subscriptions require configuration">
        <value>0</value>
      </field>
      <field var="pubsub#deliver_payloads" type="boolean" label="Deliver payloads with event notifications">
        <value>1</value>
      </field>
      <field var="pubsub#notify_config" type="boolean" label="Notify subscribers when the node configuration changes">
        <value>1</value>
      </field>
      <field var="pubsub#notify_delete" type="boolean" label="Notify subscribers when the node is deleted">
        <value>1</value>
      </field>
      <field var="pubsub#notify_retract" type="boolean" label="Notify subscribers when items are removed from the node">
        <value>1</value>
      </field>
      <field var="pubsub#presence_based_delivery" type="boolean" label="Only deliver notifications to available users">
        <value>0</value>
      </field>
      <field var="pubsub#type" type="text-single" label="Type of payload data to be provided at this node">
        <value></value>
      </field>
      <field var="pubsub#body_xslt" type="text-single" label="Message body XSLT">
        <value>/BAGGL/GJXX/LCGJ</value>
      </field>
      <field var="pubsub#dataform_xslt" type="text-single" label="Payload XSLT">
        <value></value>
      </field>
      <field var="pubsub#access_model" type="list-single" label="Specify who may subscribe and retrieve items">
        <option>
          <value>authorize</value>
        </option>
        <option>
          <value>open</value>
        </option>
        <option>
          <value>presence</value>
        </option>
        <option>
          <value>roster</value>
        </option>
        <option>
          <value>whitelist</value>
        </option>
        <value>open</value>
      </field>
      <field var="pubsub#publish_model" type="list-single" label="Publisher model">
        <option>
          <value>publishers</value>
        </option>
        <option>
          <value>subscribers</value>
        </option>
        <option>
          <value>open</value>
        </option>
        <value>open</value>
      </field>
      <field var="pubsub#roster_groups_allowed" type="list-multi" label="Roster groups allowed to subscribe"/>
      <field var="pubsub#contact" type="jid-multi" label="People to contact with questions"/>
      <field var="pubsub#language" type="text-single" label="Default language">
        <value>English</value>
      </field>
      <field var="pubsub#owner" type="jid-multi" label="Node owners">
        <value>[email protected]</value>
      </field>
      <field var="pubsub#publisher" type="jid-multi" label="Node publishers"/>
      <field var="pubsub#itemreply" type="list-single" label="Select entity that should receive replies to items">
        <option>
          <value>owner</value>
        </option>
        <option>
          <value>publisher</value>
        </option>
        <value>owner</value>
      </field>
      <field var="pubsub#replyroom" type="jid-multi" label="Multi-user chat room to which replies should be sent"/>
      <field var="pubsub#replyto" type="jid-multi" label="Users to which replies should be sent"/>
      <field var="pubsub#send_item_subscribe" type="boolean" label="Send items to new subscribers">
        <value>1</value>
      </field>
      <field var="pubsub#persist_items" type="boolean" label="Persist items to storage">
        <value>1</value>
      </field>
      <field var="pubsub#max_items" type="text-single" label="Max number of items to persist">
        <value>100000</value>
      </field>
      <field var="pubsub#max_payload_size" type="text-single" label="Max payload size in bytes">
        <value>5120</value>
      </field>
    </x>
  </query>
</iq>

1.3 订阅消息到达

<?xml version="1.0" encoding="utf-8"?>

<message from="pubsub.pc-20170308pkrs" to="[email protected]" id="N5K5HEvD">
  <event xmlns="http://jabber.org/protocol/pubsub#event">
    <items node="/BAGGL/GJXX/LCGJ">
      <item id="1528350475613">
        <pubmessage xmlns="pub:message">
          <topic>/BAGGL/GJXX/LCGJ</topic>
          <messageid>1528350475613</messageid>
          <content>流程告警193</content>
        </pubmessage>
      </item>
    </items>
  </event>
  <headers xmlns="http://jabber.org/protocol/shim">
    <header name="SubID">A5OJTdo105AM4hNOhMeNRvKiVelT2CAMCGb9NYxC</header>
  </headers>
  <delay xmlns="urn:xmpp:delay" stamp="2018-06-07T05:47:55.676Z" from="pc-20170308pkrs"></delay>
</message>
即时通讯 xmpp openfire 订阅发布
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