import org.jivesoftware.smackx.packet.HeadersExtension; //导入依赖的package包/类
private static List<String> getSubscriptionIds(Packet packet)
{
	HeadersExtension headers = (HeadersExtension)packet.getExtension("headers", "http://jabber.org/protocol/shim");
	List<String> values = null;
	
	if (headers != null)
	{
		values = new ArrayList<String>(headers.getHeaders().size());
		
		for (Header header : headers.getHeaders())
		{
			values.add(header.getValue());
		}
	}
	return values;
}
 

import org.jivesoftware.smackx.packet.HeadersExtension; //导入依赖的package包/类
private static List<String> getSubscriptionIds(Packet packet) {
	HeadersExtension headers = (HeadersExtension) packet.getExtension(
			"headers", "http://jabber.org/protocol/shim");
	List<String> values = null;

	if (headers != null) {
		values = new ArrayList<String>(headers.getHeaders().size());

		for (Header header : headers.getHeaders()) {
			values.add(header.getValue());
		}
	}
	return values;
}
 

import org.jivesoftware.smackx.packet.HeadersExtension; //导入依赖的package包/类
@Override
protected PacketExtension createReturnExtension(String currentElement, String currentNamespace, Map<String, String> attributeMap, List<? extends PacketExtension> content)
{
	return new HeadersExtension((Collection<Header>)content);
}
 

import org.jivesoftware.smackx.packet.HeadersExtension; //导入依赖的package包/类
@Override
protected PacketExtension createReturnExtension(String currentElement,
		String currentNamespace, Map<String, String> attributeMap,
		List<? extends PacketExtension> content) {
	return new HeadersExtension((Collection<Header>) content);
}