Assuming you want to show on the screen in the tableview.

In this example I used QStandardItemModel:

QXlsx::Document excel(filename);
int row=excel.dimension().firstRow();
while(row != excel.dimension().lastRow())
{
mModel->setRowCount(excel.dimension().rowCount());
mModel->setColumnCount(excel.dimension().columnCount());
for(int col=0; col < excel.dimension().columnCount(); ++col)
{
setValueAt(row, col, excel.read(row, col).value<QString>());
}
++row;
}
void QExcelView::setValueAt(int row, int col, const QString &value)
{
if(!mModel->item(row,col))
mModel->setItem(row, col, new QStandardItem(value));
else
mModel->item(row, col)->setText(value);
}