如何在JTable中拖放行？

在JTable中拖放行，可以通过实现自定义的TransferHandler和DragGestureListener来实现。以下是一个简单的示例：

首先，需要创建一个自定义的TransferHandler，用于处理行的拖放操作：

import javax.swing.*;
import java.awt.*;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.io.IOException;

public class RowTransferHandler extends TransferHandler {
    private JTable table;

    public RowTransferHandler(JTable table) {
        this.table = table;
    }

    @Override
    protected Transferable createTransferable(JComponent c) {
        JTable table = (JTable) c;
        int row = table.getSelectedRow();
        int col = table.getSelectedColumn();
        Object value = table.getValueAt(row, col);
        return new StringSelection(value.toString());
    }

    @Override
    public boolean canImport(TransferSupport support) {
        return support.isDataFlavorSupported(DataFlavor.stringFlavor);
    }

    @Override
    public boolean importData(TransferSupport support) {
        if (!canImport(support)) {
            return false;
        }

        JTable.DropLocation dl = (JTable.DropLocation) support.getDropLocation();
        int row = dl.getRow();
        int col = dl.getColumn();
        int max = table.getModel().getRowCount();

        if (row < 0 || row > max) {
            return false;
        }

        try {
            String data = (String) support.getTransferable().getTransferData(DataFlavor.stringFlavor);
            table.getModel().setValueAt(data, row, col);
            return true;
        } catch (UnsupportedFlavorException | IOException e) {
            e.printStackTrace();
        }

        return false;
    }
}

接下来，需要创建一个自定义的DragGestureListener，用于监听拖动操作：

import javax.swing.*;
import java.awt.*;
import java.awt.datatransfer.Transferable;
import java.awt.dnd.*;

public class RowDragGestureListener implements DragGestureListener {
    private JTable table;

    public RowDragGestureListener(JTable table) {
        this.table = table;
    }

    @Override
    public void dragGestureRecognized(DragGestureEvent dge) {
        Point clickPoint = dge.getDragOrigin();
        int row = table.rowAtPoint(clickPoint);
        table.getSelectionModel().setSelectionInterval(row, row);

        Transferable transferable = new StringSelection("");
        dge.startDrag(DragSource.DefaultMoveDrop, transferable, new RowDragSourceListener(table));
    }
}

最后，需要将这两个自定义的类应用到JTable中：

JTable table = new JTable();
table.setDragEnabled(true);
table.setTransferHandler(new RowTransferHandler(table));
table.getColumnModel().getSelectionModel().setSelectionMode(ListSelectionModel.SINGLE_SELECTION);

DragSource dragSource = DragSource.getDefaultDragSource();
dragSource.createDefaultDragGestureRecognizer(table, DnDConstants.ACTION_MOVE, new RowDragGestureListener(table));

这样，就可以在JTable中实现行的拖放操作了。