JavaFX custom tag permits to integrate image in the webpage

Webimg.java

package org.wingate.webimg;

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.io.File;
import java.util.Arrays;
import java.util.List;
import javafx.application.Platform;
import javafx.embed.swing.JFXPanel;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.web.WebEngine;
import javafx.scene.web.WebView;
import javax.swing.JFileChooser;
import javax.swing.filechooser.FileFilter;
import org.w3c.dom.Document;
import org.w3c.dom.html.HTMLImageElement;

/**
 *
 * @author util2
 */
public class Webimg extends javax.swing.JFrame {
    
    public static void main(String[] args) {
        EventQueue.invokeLater(() -> {
            Webimg wi = new Webimg();
            wi.setTitle("WebIMG");
            wi.setSize(1000, 600);
            wi.setLocationRelativeTo(null);
            wi.setVisible(true);
        });
    }
    
    private final JFXPanel fxPane;
    private WebView browser;
    private WebEngine webEngine;
    private JFileChooser fcOpenImage;
    
    public Webimg() {
        setDefaultCloseOperation(EXIT_ON_CLOSE);
            
        fxPane = new JFXPanel();

        getContentPane().setLayout(new BorderLayout());
        getContentPane().add(fxPane, BorderLayout.CENTER);
        
        fcOpenImage = new JFileChooser();
        for(FileFilter ff : fcOpenImage.getChoosableFileFilters()){
            fcOpenImage.removeChoosableFileFilter(ff);
        }
        fcOpenImage.addChoosableFileFilter(new FileFilter(){
            
            private final List<String> extensions = Arrays.asList(new String[]{ ".png", ".jpg" });
            
            @Override
            public boolean accept(File f) {
                String name = f.getName();
                if(f.isDirectory()) return true;
                return extensions.contains(name.substring(name.lastIndexOf(".")));
            }

            @Override
            public String getDescription() {
                return "Image (*.png, *.jpg)";
            }
        });

        Platform.runLater(() -> {
            browser = new WebView();
            webEngine = browser.getEngine();

            Group root = new Group();
            Scene scene = new Scene(root, fxPane.getWidth(), fxPane.getHeight());
            browser.setPrefSize(fxPane.getWidth(), fxPane.getHeight());

            root.getChildren().add(browser);
            fxPane.setScene(scene);
            
            int z = fcOpenImage.showOpenDialog(this);
            if(z == JFileChooser.APPROVE_OPTION){
                insertImage(fcOpenImage.getSelectedFile().toURI().toString());
            }
            
            openTextContent("<onDemandUrl/>");            
        });
        
    }
        
    private void openTextContent(String text){
        Platform.runLater(() -> {
            webEngine.loadContent(text);
        });
    }

    private void insertImage(String path){
        Platform.runLater(() -> {
            webEngine.getLoadWorker().stateProperty().addListener((obs, oldState, newState) -> {
                if(javafx.concurrent.Worker.State.SUCCEEDED.equals(newState)){
                    Document doc = webEngine.getDocument();
                    HTMLImageElement e = (HTMLImageElement)doc.createElement("img");
                    e.setSrc(path);
                    doc.getElementsByTagName("onDemandUrl").item(0).appendChild(e);
                }
            });        
        });
    }
}