How to accept dropped files in Java Swing

DropTarget.java

package scratch;

import java.awt.BorderLayout;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.io.File;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingConstants;
import javax.swing.TransferHandler;

@SuppressWarnings("serial")
public class DropTarget extends JFrame {
    private static class DropTargetTransferHandler extends TransferHandler {
        @Override
        public boolean canImport(TransferSupport support) {
            return Arrays.asList(support.getDataFlavors())
                    .contains(DataFlavor.javaFileListFlavor);
        }

        @Override
        public boolean importData(TransferSupport support) {
            try {
                System.out.println("importData");
                List<File> droppingFiles = (List<File>) support
                        .getTransferable()
                        .getTransferData(DataFlavor.javaFileListFlavor);
                System.out.println("Importing:" + droppingFiles);
                DropTarget target = (DropTarget) support.getComponent();
                target.droppedText
                        .setText(droppingFiles.get(0).getAbsolutePath());
            } catch (UnsupportedFlavorException | IOException e) {
                e.printStackTrace();
            }
            return true;
        }
    }

    private TransferHandler transferHandler = new DropTargetTransferHandler();
    private JLabel droppedText;

    public DropTarget() {
        super("Drop Target");
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        getContentPane().setLayout(new BorderLayout());
        droppedText = new JLabel("Drop Stuff Here");
        droppedText.setHorizontalAlignment(SwingConstants.CENTER);
        getContentPane().add(droppedText, BorderLayout.CENTER);
        setSize(400, 400);
        setTransferHandler(transferHandler);

    }

    public static void main(String[] args) {
        DropTarget f = new DropTarget();
        f.setVisible(true);
    }

}