JTextComponentの選択ハイライトを変更

Highlighter.HighlightPainter selectionPainter =
        new DefaultHighlighter.DefaultHighlightPainter(Color.WHITE) {
  @Override public Shape paintLayer(
      Graphics g, int offs0, int offs1, Shape bounds, JTextComponent c, View view) {
    Shape s = super.paintLayer(g, offs0, offs1, bounds, c, view);
    if (s instanceof Rectangle) {
      Rectangle r = (Rectangle) s;
      g.setColor(Color.ORANGE);
      g.fillRect(r.x, r.y + r.height - 2, r.width, 2);
    }
    return s;
  }
};
Caret caret = new DefaultCaret() {
  @Override protected Highlighter.HighlightPainter getSelectionPainter() {
    return selectionPainter;
  }
};
caret.setBlinkRate(field2.getCaret().getBlinkRate());
field2.setSelectedTextColor(Color.RED);
field2.setCaret(caret);