自定义JLabel图标

    ImageIcon imageIcon = (ImageIcon) jLabel1.getIcon();// new ImageIcon( "Play-Hot-icon.png");

    ImageIcon thumbnailIcon = new ImageIcon(getScaledImage(imageIcon.getImage(), 25 , 25));
    jLabel1.setIcon(thumbnailIcon);

private Image getScaledImage(Image srcImg, int w, int h){

    BufferedImage resizedImg = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
    Graphics2D g2 = resizedImg.createGraphics();

    g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);

    g2.drawImage(srcImg, 0, 0, w, h, null);

    g2.dispose();
    return resizedImg;
}