Java tutorial
import java.awt.Toolkit; import java.awt.datatransfer.DataFlavor; import java.awt.datatransfer.Transferable; import java.awt.datatransfer.UnsupportedFlavorException; import java.io.File; import java.io.IOException; import java.net.MalformedURLException; import java.net.URL; import java.util.Iterator; import java.util.List; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.TransferHandler; public class Main extends JFrame { public Main() { super("Drop Target"); JComponent cp = (JComponent) getContentPane(); cp.setTransferHandler(new MyFileTransferHandler()); // see below setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setSize(150, 150); } public static void main(String[] args) { new Main().setVisible(true); } } class MyFileTransferHandler extends TransferHandler { public boolean canImport(JComponent com, DataFlavor[] dataFlavors) { for (int i = 0; i < dataFlavors.length; i++) { DataFlavor flavor = dataFlavors[i]; if (flavor.equals(DataFlavor.javaFileListFlavor)) { System.out.println("canImport: JavaFileList FLAVOR: " + flavor); return true; } if (flavor.equals(DataFlavor.stringFlavor)) { System.out.println("canImport: String FLAVOR: " + flavor); return true; } System.err.println("canImport: Rejected Flavor: " + flavor); } return false; } public boolean importData(JComponent comp, Transferable t) { DataFlavor[] flavors = t.getTransferDataFlavors(); System.out.println("Trying to import:" + t); for (int i = 0; i < flavors.length; i++) { DataFlavor flavor = flavors[i]; try { if (flavor.equals(DataFlavor.javaFileListFlavor)) { System.out.println("importData: FileListFlavor"); List l = (List) t.getTransferData(DataFlavor.javaFileListFlavor); Iterator iter = l.iterator(); while (iter.hasNext()) { File file = (File) iter.next(); System.out.println("GOT FILE: " + file.getCanonicalPath()); } return true; } else if (flavor.equals(DataFlavor.stringFlavor)) { System.out.println("importData: String Flavor"); String fileOrURL = (String) t.getTransferData(flavor); System.out.println("GOT STRING: " + fileOrURL); try { URL url = new URL(fileOrURL); System.out.println("Valid URL: " + url.toString()); return true; } catch (MalformedURLException ex) { System.err.println("Not a valid URL"); return false; } } else { System.out.println("importData rejected: " + flavor); } } catch (IOException ex) { System.err.println("IOError getting data: " + ex); } catch (UnsupportedFlavorException e) { System.err.println("Unsupported Flavor: " + e); } } return false; } }