JavaFx example to make a changes in html file and reload it again in webview.

ChangeHTMLContent.java

public void reloadContent()
{
        //Using Jsoup library https://jsoup.org/cookbook/introduction/parsing-a-document
        //Get html file
        InputStream inputStream = Odata.class.getClass().getResourceAsStream("/web/html/template.html");
        //Parse the content
        org.jsoup.nodes.Document doc = Jsoup.parse(inputStream, "UTF-8", "");
        //Get Element for make some changes
       org.jsoup.nodes.Element content = doc.getElementById("name");
        //Change the text of element         
        content.text("Menai Ala Eddine");
         //Get image element
        Element image = doc.getElementById("profile-image");
        //Change relative path in jar file
        //The original path in html file :src="../../appimages/images/male-user-profile-picture.png"
        image.attr("src",getClass().getResource("/appimages/images/male-user-profile-picture.png").toExternalForm());
        
        WebView browser = new WebView();
        WebEngine webEngine = browser.getEngine();
        //Load the new content after make changing
        webEngine.loadContent(doc.html());
        webEngine.setUserStyleSheetLocation(getClass().getResource("/web/stylesheets/inscription_template.css").toString());
        Stage embeddedStage = new Stage();
        StackPane pane = new StackPane(browser);
        Scene embeddedScene = new Scene(pane, 500, 500);
        embeddedStage.setScene(embeddedScene);
        embeddedStage.show();
    
}

Answer of these questions in StackOverFlow :

• https://stackoverflow.com/questions/26447451/javafx-in-webview-img-tag-is-not-loading-local-images
• https://stackoverflow.com/questions/41400222/javafx-webview-html-loader-not-loading-images
• https://stackoverflow.com/questions/8923801/how-to-reach-css-and-image-files-from-the-html-page-loaded-by-javafx-scene-web-w