如何使用smack 4.1向xmpp服务器发送info查询报文？

import org.jivesoftware.smack.AbstractXMPPConnection;
import org.jivesoftware.smack.ConnectionConfiguration;
import org.jivesoftware.smack.SmackException;
import org.jivesoftware.smack.XMPPException;
import org.jivesoftware.smack.tcp.XMPPTCPConnection;
import org.jivesoftware.smack.tcp.XMPPTCPConnectionConfiguration;

// 创建XMPP连接
XMPPTCPConnectionConfiguration config = XMPPTCPConnectionConfiguration.builder()
    .setHost("xmpp.example.com")
    .setPort(5222)
    .setUsernameAndPassword("your_username", "your_password")
    .build();
AbstractXMPPConnection connection = new XMPPTCPConnection(config);
try {
    connection.connect();
    connection.login();
} catch (SmackException | IOException | XMPPException e) {
    e.printStackTrace();
}

import org.jivesoftware.smack.packet.IQ;
import org.jivesoftware.smack.packet.Stanza;

// 创建Info查询报文
IQ infoQuery = new IQ() {
    @Override
    public String getChildElementXML() {
        return "<query xmlns='http://jabber.org/protocol/disco#info'/>";
    }
};
infoQuery.setType(IQ.Type.get);
infoQuery.setTo("xmpp.example.com");

import org.jivesoftware.smack.StanzaListener;
import org.jivesoftware.smack.packet.Stanza;

// 发送查询报文并处理响应
connection.addSyncStanzaListener(new StanzaListener() {
    @Override
    public void processStanza(Stanza stanza) {
        // 处理服务器的响应
        System.out.println("Received response: " + stanza.toString());
    }
}, new StanzaTypeFilter(IQ.class));
try {
    connection.sendStanza(infoQuery);
} catch (SmackException.NotConnectedException | InterruptedException e) {
    e.printStackTrace();
}