// step 3: we open the document
document.open();
// step 4:
PdfFormField pushbutton = PdfFormField.createPushButton(writer);
PdfContentByte cb = writer.getDirectContent();
cb.moveTo(0, 0);
PdfAppearance normal = cb.createAppearance(100, 50);
normal.setColorFill(Color.GRAY);
normal.rectangle(5, 5, 90, 40);
normal.fill();
PdfAppearance rollover = cb.createAppearance(100, 50);
rollover.setColorFill(Color.RED);
rollover.rectangle(5, 5, 90, 40);
rollover.fill();
PdfAppearance down = cb.createAppearance(100, 50);
down.setColorFill(Color.BLUE);
down.rectangle(5, 5, 90, 40);
down.fill();
pushbutton.setFieldName("PushMe");
pushbutton.setAppearance(PdfAnnotation.APPEARANCE_NORMAL, normal);
pushbutton.setAppearance(PdfAnnotation.APPEARANCE_ROLLOVER, rollover);
pushbutton.setAppearance(PdfAnnotation.APPEARANCE_DOWN, down);
pushbutton.setWidget(new LwgRectangle(100, 700, 200, 750), PdfAnnotation.HIGHLIGHT_PUSH);
writer.addAnnotation(pushbutton);
}
catch(DocumentException de) {
System.err.println(de.getMessage());