고 투 더 멘토

// user. We use an AndFilter to combine two other filters.
PacketFilter filter = new AndFilter(new PacketTypeFilter(Message.class), 
        new FromContainsFilter("mary@jivesoftware.com"));
// Assume we've created an XMPPConnection name "connection".

// First, register a packet collector using the filter we created.
PacketCollector myCollector = connection.createPacketCollector(filter);
// Normally, you'd do something with the collector, like wait for new packets.

// Next, create a packet listener. We use an anonymous inner class for brevity.
PacketListener myListener = new PacketListener() {
        public void processPacket(Packet packet) {
            // Do something with the incoming packet here.
        }
    };
// Register the listener.
connection.addPacketListener(myListener, filter);