Editar HTML en Java

Presentation pres = new Presentation();
try {
    pres.getSlides().removeAt(0);
    FileInputStream htmlStream = new FileInputStream("page.html");
    try {
        pres.getSlides().addFromHtml(htmlStream);
    } finally {
        if (htmlStream != null) htmlStream.close();
    }

    ISlide slide = pres.getSlides().get_Item(0);
    IAutoShape shape = slide.getShapes().addAutoShape(ShapeType.Rectangle, 10, 10, 100, 50);
    shape.getTextFrame().setText("New text");

    pres.save("page.html", SaveFormat.Html5);
} catch(IOException e) {
} finally {
    if (pres != null) pres.dispose();
}