急！！！HSSFWorkbook生成的execl的下拉列表时如何设置此单元格的默认值，请同志们指教！

急！！！HSSFWorkbook生成的execl的下拉列表时如何设置此单元格的默认值，请同志们指教！

HSSFWorkbook wb = null;
try {
wb = new HSSFWorkbook(multipartFile.getInputStream());
logger.debug(wb.getNumberOfSheets());
HSSFSheet sheet = wb.getSheetAt(0);
Iterator<Row> rows = sheet.rowIterator();
List<List<String>> content = new ArrayList<List<String>>();
while(rows.hasNext()){
Row row = rows.next();
Iterator<Cell> cells = row.cellIterator();
List<String> line = new ArrayList<String>();
while(cells.hasNext()){
Cell cell = cells.next();
line.add(cell.getCellComment().getString().getString());
}
content.add(line);
}
return content;
} catch (Exception e) {
logger.error(e);
// throw new
// BusinessServiceException("未知原因！保存Excel文件时，请不要将鼠标最终定位在Excel中的可以下拉选值的列上。");
}