Czy ktoś może mi pokazać, co robię źle? Udało mi się uzyskać efekt „przeciągnij i upuść” przy użyciu zwykłego panelu, ale teraz próbuję za pomocą tabeli i nie mogę tego rozwiązać. Jestem zmieszany z punktami i punktami DropTargets. Nie przejmuj się przyciskiem „Dodaj”. Czuję, że najpierw muszę poradzić sobie z DnD.

public class Table extends JFrame implements ActionListener {

    private JTable table;
    private JScrollPane scroll;
    private JButton add;
    private JFileChooser choose;
    private JMenuBar menubar;
    private JMenu menu;
    private JMenuItem file;
    private DefaultTableModel tm = new DefaultTableModel(new String[] { "File",
            "File Type", "Size", "Status" }, 2);

    public Table() {

        // String column [] = {"Filename ","File Type", "Size", "Status" };
        /*
         * Object[][] data = { {"File1", ".jpg","32 MB", "Not Processed"},
         * {"File2", ".txt"," 5 Kb", "Not Processed"}, {"File3", ".doc","3 Kb",
         * "Not Processed"},
         * };
         */

        table = new JTable();
        table.setModel(tm);
        table.setFillsViewportHeight(true);
        table.setPreferredSize(new Dimension(500, 300));

        scroll = new JScrollPane(table);

        table.setDropTarget(new DropTarget() {
            @Override
            public synchronized void drop(DropTargetDropEvent dtde) {

                Point point = dtde.getLocation();
                int column = table.columnAtPoint(point);
                int row = table.rowAtPoint(point);

                dtde.acceptDrop(DnDConstants.ACTION_COPY_OR_MOVE);
                Transferable t = dtde.getTransferable();
                List fileList = null;
                try {
                    fileList = (List) t
                            .getTransferData(DataFlavor.javaFileListFlavor);
                } catch (UnsupportedFlavorException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                File f = (File) fileList.get(0);
                table.setValueAt(f.getAbsolutePath(), row, column);
                table.setValueAt(f.length(), row, column + 1);
                super.drop(dtde);
            }
        });
        scroll.setDropTarget(new DropTarget() {
            @Override
            public synchronized void drop(DropTargetDropEvent dtde) {
                Point point = dtde.getLocation();
                int column = table.columnAtPoint(point);
                int row = table.rowAtPoint(point);

                dtde.acceptDrop(DnDConstants.ACTION_COPY_OR_MOVE);
                Transferable t = dtde.getTransferable();
                List fileList = null;
                try {
                    fileList = (List) t
                            .getTransferData(DataFlavor.javaFileListFlavor);
                } catch (UnsupportedFlavorException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                File f = (File) fileList.get(0);
                table.setValueAt(f.getAbsolutePath(), row, column);
                table.setValueAt(f.length(), row, column + 1);
                // handle drop outside current table (e.g. add row)
                super.drop(dtde);
            }
        });

        add(scroll, BorderLayout.CENTER);

        menubar = new JMenuBar();
        menu = new JMenu("File");
        file = new JMenuItem("file");
        menu.add(file);
        // menubar.add(menu);
        add(menu, BorderLayout.NORTH);

        ImageIcon icon = new ImageIcon("lock_icon.png");

        add = new JButton("Add", icon);
        add.addActionListener(this);

        JFileChooser choose = new JFileChooser();
        choose.addActionListener(this);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        JButton clicked = (JButton) e.getSource();

        int returnValue = 0;

        if (clicked == add) {
            choose = new JFileChooser();
            choose.showOpenDialog(null);

            if (returnValue == JFileChooser.APPROVE_OPTION) {
                File file = choose.getSelectedFile();
                file.getAbsolutePath();

            }

        }

    }

    public static void main(String[] args) {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {

                Table t = new Table();

                t.setDefaultCloseOperation(EXIT_ON_CLOSE);
                t.pack();
                t.setSize(600, 200);
                t.setVisible(true);
                t.setTitle("ZipLock");
                t.setIconImage(null);

            }
        });

    }

}