Error:groovy.lang.MissingPropertyException: No such property: Workbook for class: Script1

you can use the poi jar. below is the sample

first you need to copy the poi jar in the lib folder and try to execute below sample code.

String fileLocation = "H:\\Desktop\\mSSanity_SOAPUI Framework\\FMO mS_Automation_DataSheet_v1_UAT.xls"; // Change the file path.

FileInputStream fis=new FileInputStream(new File(fileLocation));
HSSFWorkbook wb=new HSSFWorkbook(fis);
HSSFSheet sheet=wb.getSheetAt(0);
Row row = sheet.getRow(0)
log.info (sheet.getPhysicalNumberOfRows())
Cell cell=row.getCell(1);
value=cell.getStringCellValue();
log.info (value)