連接中關聯如下：

1. // iq提供者
2. roviderManager.getInstance().addIQProvider("ping", "urn:xmpp:ping",
3. new PingIQProvider());
4. onnection.addPacketListener(new PacketListener() {
6. @Override
7. public void processPacket(Packet p) {
8. PingIQ pingIQ = (PingIQ) p;
9. IQ pongIQ = pingIQ.createResultIQ(pingIQ);
10. // 返回
11. connection.sendPacket(pongIQ);
13. }
14. , new PacketTypeFilter(PingIQ.class));

兩個關聯類，PingIQ，PingIQProvider

1. import org.jivesoftware.smack.packet.IQ;
3. public class PingIQ extends IQ {
5. public static final String ELEMENT = "ping";
6. public static final String NAMESPACE = "urn:xmpp:ping";
8. @Override
9. public String getChildElementXML() {
10. StringBuffer sb = new StringBuffer();
11. sb.append("<").append(ELEMENT).append(" xmlns=\"").append(NAMESPACE)
12. .append("\">");
14. sb.append("</").append(ELEMENT).append(">");
15. return sb.toString();
17. }
19. }

1. import org.jivesoftware.smack.packet.IQ;
2. import org.jivesoftware.smack.provider.IQProvider;
3. import org.xmlpull.v1.XmlPullParser;
5. public class PingIQProvider implements IQProvider {
7. @Override
8. public IQ parseIQ(XmlPullParser parser) throws Exception {
9. // TODO Auto-generated method stub
10. PingIQ iq = new PingIQ();
11. return iq;
12. }
14. }

報文如下：

1. <iq xmlns="jabber:client" type="get" id="65dfds" from="localhost" to="[email protected]/test"><ping xmlns="urn:xmpp:ping"/></iq>
4. <iq type="result" to="localhost" id="65dfds"/>
   

http://linyu19872008.iteye.com/blog/1840596

openfire ping的smack解決方案（維持在線狀態）