Clipboardから文字列や画像を取得する

private ClipboardService cs = null;
public JComponent makeUI() {
  try {
    cs = (ClipboardService) ServiceManager.lookup("javax.jnlp.ClipboardService");
  } catch (UnavailableServiceException e) {
    cs = null;
  }
  JPanel p = new JPanel(new BorderLayout());
  p.add(new JScrollPane(label));
  p.add(new JButton(new AbstractAction("get Clipboard DataFlavor") {
    @Override public void actionPerformed(ActionEvent e) {
      try {
        Transferable t = Objects.isNull(cs)
          ? Toolkit.getDefaultToolkit().getSystemClipboard().getContents(null)
          : cs.getContents();
        if (t == null) {
          Toolkit.getDefaultToolkit().beep();
          return;
        }
        String str = "";
        ImageIcon image = null;
        if (t.isDataFlavorSupported(DataFlavor.imageFlavor)) {
          image = new ImageIcon((Image) t.getTransferData(DataFlavor.imageFlavor));
        } else if (t.isDataFlavorSupported(DataFlavor.stringFlavor)) {
          str = (String) t.getTransferData(DataFlavor.stringFlavor);
        }
        label.setText(str);
        label.setIcon(image);
      } catch (Exception ex) {
        ex.printStackTrace();
      }
    }
  }), BorderLayout.SOUTH);
  return p;
}