<?page title="new page title" contentType="text/html;charset=UTF-8"?>
<zk>
	<window title="new page title" border="normal"
		apply="com.FileUploadComposer" id="devWindow">
		<button upload="true" id="btnUpload" label="Upload Button" />
		<button id="upload" label="Upload.get" />
	</window>
</zk>

package com;
import org.zkoss.util.media.Media;
import org.zkoss.zk.ui.event.Event;
import org.zkoss.zk.ui.event.ForwardEvent;
import org.zkoss.zk.ui.event.UploadEvent;
import org.zkoss.zk.ui.util.GenericForwardComposer;
import org.zkoss.zul.Fileupload;

public class FileUploadComposer extends GenericForwardComposer {
	

	public void onUpload$btnUpload(Event event) {
		Media media = ((UploadEvent) ((ForwardEvent) event).getOrigin()).getMedia();
		System.out.println(media.getName());
	}

	public void onClick$upload() {
		try {
			int maxFiles = 3; 
			int maxSize = 104857600; 
			boolean alwaysNative = true;
			
			// always returns null, handle UploadEvent in listener 
			Fileupload.get("message", "title", maxFiles, maxSize, alwaysNative);
		} catch (Exception e) {
			System.out.println("{} Upload failed onClick$upload()");			
		} 
	}
	
	public void onUpload$devWindow(Event event) {
		Media media = ((UploadEvent) ((ForwardEvent) event).getOrigin()).getMedia();
		System.out.println(media.getName());
	}
}