StringBuilder contents = new StringBuilder();
POIFSFileSystem fileSystem = new POIFSFileSystem(is);
HSSFWorkbook workBook = new HSSFWorkbook(fileSystem);
for (int i = 0; i < workBook.getNumberOfSheets(); i++) {
HSSFSheet sheet = workBook.getSheetAt(i);
Iterator<Row> rows = sheet.rowIterator();
while (rows.hasNext()) {
HSSFRow row = (HSSFRow) rows.next();
// Display the row number
log.debug(row.getRowNum());
Iterator<Cell> cells = row.cellIterator();