使用Clipboard和AbstractAction进行JTable复制和粘贴

当我尝试使用table.setValueAt()粘贴到JTable单元格时，我粘贴的单元格仍为空白，但setValueAt()似乎正在工作。 此外，当我尝试从一个单元格中剪切或复制时，当我想要粘贴到另一个单元格时，我的JPopupMenu上的粘贴选项仍然处于禁用状态。 我不知道为什么。 我的代码如下。

 class CopyAction extends AbstractAction { private JTable table; public CopyAction(JTable table) { this.table = table; } @Override public void actionPerformed(ActionEvent e) { int row = table.getSelectedRow(); int col = table.getSelectedColumn(); Clipboard cb = Toolkit.getDefaultToolkit().getSystemClipboard(); cb.setContents(new CellTransferable(table.getValueAt(row, col)), null); } } class CutAction extends AbstractAction { private JTable table; public CutAction(JTable table) { this.table = table; } @Override public void actionPerformed(ActionEvent e) { int row = table.getSelectedRow(); int col = table.getSelectedColumn(); Clipboard cb = Toolkit.getDefaultToolkit().getSystemClipboard(); cb.setContents(new CellTransferable(table.getValueAt(row, col)), null); } } class PasteAction extends AbstractAction { private JTable table; private GridModel gridModel; public PasteAction(JTable tbl, GridModel gm) { gridModel = gm; table = tbl; final Clipboard cb = Toolkit.getDefaultToolkit().getSystemClipboard(); cb.addFlavorListener(new FlavorListener() { @Override public void flavorsChanged(FlavorEvent e) { setEnabled(cb.isDataFlavorAvailable(CellTransferable.CELL_DATA_FLAVOR)); } }); setEnabled(cb.isDataFlavorAvailable(CellTransferable.CELL_DATA_FLAVOR)); } @Override public void actionPerformed(ActionEvent e) { int row = table.getSelectedRow(); int col = table.getSelectedColumn(); Clipboard cb = Toolkit.getDefaultToolkit().getSystemClipboard(); if (cb.isDataFlavorAvailable(CellTransferable.CELL_DATA_FLAVOR)) { try { Object value = cb.getData(CellTransferable.CELL_DATA_FLAVOR); System.out.println(value); table.setValueAt(value, row, col); } catch (UnsupportedFlavorException | IOException ex) { ex.printStackTrace(); } } } } class CellTransferable implements Transferable { public static final DataFlavor CELL_DATA_FLAVOR = new DataFlavor(Object.class, "application/x-cell-value"); private Object cellValue; public CellTransferable(Object cellValue) { this.cellValue = cellValue; } @Override public DataFlavor[] getTransferDataFlavors() { return new DataFlavor[]{CELL_DATA_FLAVOR}; } @Override public boolean isDataFlavorSupported(DataFlavor flavor) { return CELL_DATA_FLAVOR.equals(flavor); } @Override public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException, IOException { if (!isDataFlavorSupported(flavor)) { throw new UnsupportedFlavorException(flavor); } return cellValue; } } 

这是我的setValueAt()代码

 class MyModel extends AbstractTableModel { private String[] names = {"1", "2", "3", "4", "5" }; private String[][] values = new String[5][5]; //...other methods public void setValueAt(Object value, int row, int col) { if (value instanceof Double || value instanceof Integer) values[row][col] = value.toString(); else { values[row][col] = (String) value; } fireTableCellUpdated(row, col); } } 

Answer 1

基于您的示例代码并且必须填写空白，它对我有用…

 import java.awt.BorderLayout; import java.awt.EventQueue; import java.awt.Point; import java.awt.Toolkit; import java.awt.datatransfer.Clipboard; import java.awt.datatransfer.DataFlavor; import java.awt.datatransfer.FlavorEvent; import java.awt.datatransfer.FlavorListener; import java.awt.datatransfer.Transferable; import java.awt.datatransfer.UnsupportedFlavorException; import java.awt.event.ActionEvent; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.io.IOException; import javax.swing.AbstractAction; import javax.swing.JFrame; import javax.swing.JPopupMenu; import javax.swing.JTable; import javax.swing.UIManager; import javax.swing.UnsupportedLookAndFeelException; import javax.swing.table.AbstractTableModel; public class TableExample { public static void main(String[] args) { new TableExample(); } public TableExample() { EventQueue.invokeLater(new Runnable() { @Override public void run() { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) { } JTable table = new JTable(new MyModel()); final JPopupMenu pm = new JPopupMenu(); pm.add(new CopyAction(table)); pm.add(new PasteAction(table)); table.addMouseListener(new MouseAdapter() { @Override public void mouseClicked(MouseEvent e) { if (e.isPopupTrigger()) { highlightRow(e); doPopup(e); } } @Override public void mouseReleased(MouseEvent e) { if (e.isPopupTrigger()) { highlightRow(e); doPopup(e); } } protected void doPopup(MouseEvent e) { pm.show(e.getComponent(), e.getX(), e.getY()); } protected void highlightRow(MouseEvent e) { JTable table = (JTable) e.getSource(); Point point = e.getPoint(); int row = table.rowAtPoint(point); int col = table.columnAtPoint(point); table.setRowSelectionInterval(row, row); table.setColumnSelectionInterval(col, col); } }); JFrame frame = new JFrame("Testing"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLayout(new BorderLayout()); frame.add(table); frame.pack(); frame.setLocationRelativeTo(null); frame.setVisible(true); } }); } public class MyModel extends AbstractTableModel { private String[] names = {"1", "2", "3", "4", "5"}; private String[][] values = new String[5][5]; public MyModel() { values = new String[10][names.length]; for (int row = 0; row < 10; row++) { for (int col = 0; col < names.length; col++) { values[row][col] = String.valueOf((char) ((row * names.length) + col + 65)); } } } @Override public void setValueAt(Object value, int row, int col) { if (value instanceof Double || value instanceof Integer) { values[row][col] = value.toString(); } else { values[row][col] = (String) value; } fireTableCellUpdated(row, col); } @Override public int getRowCount() { return values.length; } @Override public int getColumnCount() { return names.length; } @Override public Object getValueAt(int rowIndex, int columnIndex) { return values[rowIndex][columnIndex]; } } class CopyAction extends AbstractAction { private JTable table; public CopyAction(JTable table) { this.table = table; putValue(NAME, "Copy"); } @Override public void actionPerformed(ActionEvent e) { int row = table.getSelectedRow(); int col = table.getSelectedColumn(); Clipboard cb = Toolkit.getDefaultToolkit().getSystemClipboard(); cb.setContents(new CellTransferable(table.getValueAt(row, col)), null); } } class CutAction extends AbstractAction { private JTable table; public CutAction(JTable table) { this.table = table; } @Override public void actionPerformed(ActionEvent e) { int row = table.getSelectedRow(); int col = table.getSelectedColumn(); Clipboard cb = Toolkit.getDefaultToolkit().getSystemClipboard(); cb.setContents(new CellTransferable(table.getValueAt(row, col)), null); } } class PasteAction extends AbstractAction { private JTable table; public PasteAction(JTable tbl) { putValue(NAME, "Paste"); table = tbl; final Clipboard cb = Toolkit.getDefaultToolkit().getSystemClipboard(); cb.addFlavorListener(new FlavorListener() { @Override public void flavorsChanged(FlavorEvent e) { setEnabled(cb.isDataFlavorAvailable(CellTransferable.CELL_DATA_FLAVOR)); } }); setEnabled(cb.isDataFlavorAvailable(CellTransferable.CELL_DATA_FLAVOR)); } @Override public void actionPerformed(ActionEvent e) { int row = table.getSelectedRow(); int col = table.getSelectedColumn(); Clipboard cb = Toolkit.getDefaultToolkit().getSystemClipboard(); if (cb.isDataFlavorAvailable(CellTransferable.CELL_DATA_FLAVOR)) { try { Object value = cb.getData(CellTransferable.CELL_DATA_FLAVOR); System.out.println(value); table.setValueAt(value, row, col); } catch (UnsupportedFlavorException | IOException ex) { ex.printStackTrace(); } } } } public static class CellTransferable implements Transferable { public static final DataFlavor CELL_DATA_FLAVOR = new DataFlavor(Object.class, "application/x-cell-value"); private Object cellValue; public CellTransferable(Object cellValue) { this.cellValue = cellValue; } @Override public DataFlavor[] getTransferDataFlavors() { return new DataFlavor[]{CELL_DATA_FLAVOR}; } @Override public boolean isDataFlavorSupported(DataFlavor flavor) { return CELL_DATA_FLAVOR.equals(flavor); } @Override public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException, IOException { if (!isDataFlavorSupported(flavor)) { throw new UnsupportedFlavorException(flavor); } return cellValue; } } } 

现在，也许你想提供一个可运行的例子来certificate它不起作用......