swing drag&drop file transferable? - swing

Question

I would like to drag and drop from my application into a system folder, so that when I drop an item, it shows up as a new file that represents the object I dragged.
What DataFlavor should I use?

Answer 1

I figured it out myself. You just need to use DataFlavor.javaFileListFlavor and create a temporary file somewhere, and it all works well. Here's what worked for me:
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.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
public class FileTransferable implements Transferable
{
final private List<File> files;
final private DataFlavor[] flavors;
/**
* A drag-and-drop object for transfering a file.
* #param file file to transfer -- this file should already exist,
* otherwise it may not be accepted by drag targets.
*/
public FileTransferable(Collection<File> files) {
this.files = Collections.unmodifiableList(
new ArrayList<File>(files));
this.flavors = new DataFlavor[]
{ DataFlavor.javaFileListFlavor };
}
static FileTransferable createFileInTempDirectory(String filename)
throws IOException
{
File dir = new File(System.getProperty("java.io.tmpdir"));
File f = new File(dir, filename);
f.createNewFile();
return new FileTransferable(Collections.singletonList(f));
}
public List<File> getFiles() { return this.files; }
#Override public Object getTransferData(DataFlavor flavor)
throws UnsupportedFlavorException, IOException
{
if (isDataFlavorSupported(flavor))
return this.files;
else
return null;
}
#Override public DataFlavor[] getTransferDataFlavors() {
return this.flavors;
}
#Override public boolean isDataFlavorSupported(DataFlavor flavor) {
return DataFlavor.javaFileListFlavor.equals(flavor);
}
}