JTable的默认TransferHandler以制表符分隔的格式导出数据。我正在尝试创建自己的TransferHandler,该数据将数据导出为HTML表,但是目前使用该工具时,没有任何内容被复制到剪贴板。如何添加此功能?
当前,我正在使用table.setTransferHandler(new TableTransferHandler());
将以下TransferHandler添加到我的表中:
public class TableTransferHandler extends TransferHandler {
final static Logger logger = LoggerFactory.getLogger("TableTransferHandler");
@Override
protected Transferable createTransferable(JComponent comp) {
JTable table = (JTable) comp;
logger.debug("creating table selection transferable");
return new TableSelection(table);
}
}
TableSelection
可转让:public class TableSelection implements Transferable {
final static Logger logger = LoggerFactory.getLogger("TableSelection");
private static DataFlavor HTML_TEXT;
private static final List<DataFlavor> flavors = new ArrayList<DataFlavor>();
private JTable table;
public TableSelection(JTable table) {
this.table = table;
}
@Override
public boolean isDataFlavorSupported(DataFlavor flavor) {
return flavors.contains(flavor);
}
@Override
public DataFlavor[] getTransferDataFlavors() {
return flavors.toArray(new DataFlavor[0]);
}
@Override
public Object getTransferData(DataFlavor flavor) throws IOException, UnsupportedFlavorException {
if (flavor.equals(HTML_TEXT)) {
StringBuilder sb = new StringBuilder("<table>");
int[] rows = table.getSelectedRows();
int[] cols = table.getSelectedColumns();
for (int row : rows) {
int col_index = 0;
sb.append("<tr><td>");
for (int col : cols) {
Object value = table.getValueAt(row, col);
if (value != null)
sb.append(value.toString());
if (col_index + 1 < cols.length)
sb.append("</td><td>");
}
sb.append("</td></tr>\n");
}
sb.append("</table>");
return sb.toString();
}
else {
throw new UnsupportedFlavorException(flavor);
}
}
static {
try {
HTML_TEXT = new DataFlavor("text/html;class=java.lang.String");
flavors.add(HTML_TEXT);
}
catch (ClassNotFoundException e) {
logger.error("Couldn't create HTML_TEXT flavor", e);
}
}
}
最佳答案
只有一件丢失了。您需要实现TransferHandler.getSourceActions
,如下所示:
public class TableTransferHandler extends TransferHandler {
...
@Override
public int getSourceActions(JComponent c) {
return COPY;
}
}
编辑:这在Mac OS X上有效。但是在Windows上,可以粘贴到记事本或写字板,但不能用于OpenOffice calc。经过一番调查,我认为Java AWT和OpenOffice都有故障:
Java产生以下HTML剪贴板格式:
版本:0.9
开始HTML:-1
EndHTML:-1
...
这两个
-1
是错误的。它们应该是一些正偏移量。有一个know JDK bug与此处的内容非常接近。另一方面,OpenOffice无法处理这种部分正确的剪贴板格式,而记事本或写字板则可以。如果在OpenOffice bugzilla数据库中搜索“粘贴html计算器”,则为7300+ (!) open bugs。