Datei in Java öffnen...

package de.tutorials;

import java.awt.BorderLayout;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.dnd.DnDConstants;
import java.awt.dnd.DropTarget;
import java.awt.dnd.DropTargetAdapter;
import java.awt.dnd.DropTargetDropEvent;
import java.io.File;
import java.io.IOException;
import java.net.URISyntaxException;
import java.net.URL;

import javax.swing.DefaultListModel;
import javax.swing.JFrame;
import javax.swing.JList;

public class DropDemo extends JFrame {

	private DefaultListModel listModel;

	public DropDemo() {
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setTitle("DropDemo listing");
		setSize(300, 400);
		setLocationRelativeTo(null);

		initCenter( );
	}

	private void initCenter() {
		listModel = new DefaultListModel( );
		JList dropFileList = new JList(listModel);
		dropFileList.setDragEnabled(true);
		DropTarget dropTarget = new DropTarget(dropFileList,
				new FileDropTargetListener( ));
		add(dropFileList, BorderLayout.CENTER);
	}

	private class FileDropTargetListener extends DropTargetAdapter {

		@Override
		public void drop(DropTargetDropEvent evt) {
			final Transferable transferable = evt.getTransferable( );

			DataFlavor flavor = new DataFlavor(String.class,
					"text/uri-list; class=java.lang.String");
			if (transferable.isDataFlavorSupported(flavor)) {
				evt.acceptDrop(DnDConstants.ACTION_LINK);
				try {
					String transferData = (String) transferable
							.getTransferData(flavor);

					URL url = new URL(transferData);
					File file = new File(url.toURI( ));
					System.out.println(file.getAbsolutePath( ));

					listModel.addElement(file.getAbsolutePath( ));

					// Fertig
					evt.getDropTargetContext( ).dropComplete(true);
				}
				catch (UnsupportedFlavorException e) {
					e.printStackTrace( );
					evt.rejectDrop( );
				}
				catch (IOException e) {
					e.printStackTrace( );
					evt.rejectDrop( );
				}
				catch (URISyntaxException e) {
					e.printStackTrace( );
					evt.rejectDrop( );
				}
			}
			else {
				System.out.println("Flavor " + flavor + " not supported");
				evt.rejectDrop( );
			}

		}

	}

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

package test;

import java.awt.BorderLayout;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.dnd.DnDConstants;
import java.awt.dnd.DropTarget;
import java.awt.dnd.DropTargetAdapter;
import java.awt.dnd.DropTargetDropEvent;
import java.io.File;
import java.io.IOException;
import java.util.List;

import javax.swing.DefaultListModel;
import javax.swing.JFrame;
import javax.swing.JList;

public class DropDemo extends JFrame {

	private DefaultListModel listModel;

	public DropDemo() {
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setTitle("DropDemo listing");
		setSize(300, 400);
		setLocationRelativeTo(null);

		initCenter();
	}

	private void initCenter() {
		listModel = new DefaultListModel();
		JList dropFileList = new JList(listModel);
		dropFileList.setDragEnabled(true);
		DropTarget dropTarget = new DropTarget(dropFileList,
				new FileDropTargetListener());
		add(dropFileList, BorderLayout.CENTER);
	}

	private class FileDropTargetListener extends DropTargetAdapter {

		@Override
		public void drop(DropTargetDropEvent evt) {
			final Transferable transferable = evt.getTransferable();

			DataFlavor flavor = DataFlavor.javaFileListFlavor;
			if (transferable.isDataFlavorSupported(flavor)) {
				evt.acceptDrop(DnDConstants.ACTION_LINK);
				try {
					List<File> transferData = (List<File>) transferable
							.getTransferData(flavor);

					for (File file : transferData) {
						System.out.println(file.getAbsolutePath());
						listModel.addElement(file.getAbsolutePath());
					}

					// Fertig
					evt.getDropTargetContext().dropComplete(true);
				} catch (UnsupportedFlavorException e) {
					e.printStackTrace();
					evt.rejectDrop();
				} catch (IOException e) {
					e.printStackTrace();
					evt.rejectDrop();
				}
			} else {
				System.out.println("Flavor " + flavor + " not supported");
				evt.rejectDrop();
			}
		}
	}

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