拖拽表数据实现数据的传输

将表中一条记录拖拽至树中节点时需在表中监听TransferHandler事件
fetchTable.setTransferHandler(new ReportTree_TransferHandler());
类ReportTree_TransferHandler继承至TransferHandler 具体实现如下所示：

    class ReportTree_TransferHandler extends TransferHandler {
        DataFlavor localObjectFlavor;
        String localObjectType = DataFlavor.javaJVMLocalObjectMimeType +
                                 ";class=java.io.InputStream";
        DataFlavor[] supportedFlavors = {localObjectFlavor};

        public ReportTree_TransferHandler() {
            try {
                localObjectFlavor = new DataFlavor(localObjectType);
            } catch (ClassNotFoundException ex) {
                System.out.println(ex.getException());
            }
        }

        public Transferable createTransferable(JComponent c) {
            isTableDragged = true;
            int selrow = fetchTable.getSelectedRow();
            SOW sow = (SOW) fetchTable.getValueAt(selrow, 0);
            DefaultMutableTreeNode treeNode = new DefaultMutableTreeNode(new
                    FetchTable(new Long(sow.getId()), sow.getName()));

            return new TreeNodeTransferable(treeNode);
        }

        public int getSourceActions(JComponent c) {
            return COPY_OR_MOVE;
        }

        class TreeNodeTransferable implements Transferable {
            Object object;
            public TreeNodeTransferable(Object o) {
                object = o;
            }

            public Object getTransferData(DataFlavor df) throws
                    UnsupportedFlavorException, IOException {
                if (isDataFlavorSupported(df)) {
                    return object;
                } else {
                    throw new UnsupportedFlavorException(df);
                }
            }

            public boolean isDataFlavorSupported(DataFlavor df) {
                return (df.equals(localObjectFlavor));
            }

            public DataFlavor[] getTransferDataFlavors() {
                return supportedFlavors;
            }
        }
    }

树是DnDDragJTree的一个实例，重写了drop(DropTargetDropEvent dtde)方法
在该方法中获取传输的值为：
Object droppedObject = dtde.getTransferable().getTransferData(
localObjectFlavor);