ZK upload PDF to server and show in the screen using MVVM

Simple example to upload PDF file in the server and show the content using iframe.

<zk>
	<window id="test" border="normal" height="98%"
		apply="org.zkoss.bind.BindComposer"
		viewModel="@id('vm') @init('org.zk.example.FileUploadVM')">
		<label value="You are using: ${desktop.webApp.version}" />
		<separator></separator>
		<label
			value="Example for File upload to the server and display it" />
		<separator></separator>
		<hbox>
			<label value="Upload any PDF File" />
			<button label="Upload" upload="true"
				onUpload="@command('onUploadPDF',upEvent=event)">
			</button>
			<button label="Show PDF" visible="@load(vm.fileuploaded)"
				onClick="@command('showPDF')">
			</button>
		</hbox>

		<iframe height="100%" width="100%" id="reportframe"
			content="@bind(vm.fileContent)">
		</iframe>
	</window>




</zk>

ViewModel

package org.zk.example;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Calendar;

import org.zkoss.bind.BindContext;
import org.zkoss.bind.BindUtils;
import org.zkoss.bind.annotation.AfterCompose;
import org.zkoss.bind.annotation.Command;
import org.zkoss.bind.annotation.ContextParam;
import org.zkoss.bind.annotation.ContextType;
import org.zkoss.bind.annotation.NotifyChange;
import org.zkoss.io.Files;
import org.zkoss.util.media.AMedia;
import org.zkoss.util.media.Media;
import org.zkoss.zk.ui.Component;
import org.zkoss.zk.ui.Executions;
import org.zkoss.zk.ui.event.UploadEvent;
import org.zkoss.zk.ui.select.Selectors;
import org.zkoss.zk.ui.select.annotation.Wire;
import org.zkoss.zul.Iframe;
import org.zkoss.zul.Messagebox;
import org.zkoss.zul.Window;

public class FileUploadVM {

	private String filePath;
	private boolean fileuploaded = false;
	AMedia fileContent;

	@Wire("#test")
	private Window win;

	public AMedia getFileContent() {
		return fileContent;
	}

	public void setFileContent(AMedia fileContent) {
		this.fileContent = fileContent;
	}

	public boolean isFileuploaded() {
		return fileuploaded;
	}

	public void setFileuploaded(boolean fileuploaded) {
		this.fileuploaded = fileuploaded;
	}

	@AfterCompose
	public void initSetup(@ContextParam(ContextType.VIEW) Component view)
			  {
		Selectors.wireComponents(view, this, false);
	 
	}

	@Command
	@NotifyChange("fileuploaded")
	public void onUploadPDF(
			@ContextParam(ContextType.BIND_CONTEXT) BindContext ctx)
			throws IOException {

		UploadEvent upEvent = null;
		Object objUploadEvent = ctx.getTriggerEvent();
		if (objUploadEvent != null && (objUploadEvent instanceof UploadEvent)) {
			upEvent = (UploadEvent) objUploadEvent;
		}
		if (upEvent != null) {
			Media media = upEvent.getMedia();
			Calendar now = Calendar.getInstance();
			int year = now.get(Calendar.YEAR);
			int month = now.get(Calendar.MONTH); // Note: zero based!
			int day = now.get(Calendar.DAY_OF_MONTH);
			filePath = Executions.getCurrent().getDesktop().getWebApp()
					.getRealPath("/");
			String yearPath = "\\" + "PDFs" + "\\" + year + "\\" + month + "\\"
					+ day + "\\";
			filePath = filePath + yearPath;
			File baseDir = new File(filePath);
			if (!baseDir.exists()) {
				baseDir.mkdirs();
			}

			Files.copy(new File(filePath + media.getName()),
					media.getStreamData());
			Messagebox.show("File Sucessfully uploaded in the path [ ."
					+ filePath + " ]");
			fileuploaded = true;
			filePath = filePath + media.getName();
		}
	}

	@Command
	@NotifyChange("fileContent")
	public void showPDF() throws IOException {
		File f = new File(filePath);
		Messagebox.show(" dfdfdfdsfdsf" + filePath);
		byte[] buffer = new byte[(int) f.length()];
		FileInputStream fs = new FileInputStream(f);
		fs.read(buffer);
		fs.close();
		ByteArrayInputStream is = new ByteArrayInputStream(buffer);
		fileContent = new AMedia("report", "pdf", "application/pdf", is);
		 
		 

	}
}