code: public static XlsWorkbook getWorkbook(File file) throws IOException
      {
          try
          {
              return new XlsWorkbook(file);
          }
          catch(jxl.read.biff.BiffException e)
          {
              throw new IOException(e);
          }
      }
docs: Returns an existing workbook object.
  @param file The file with the workbook
  @return The existing workbook object
  @throws IOException if the workbook cannot be opened