实现方法：
//创建下拉框private static void creatDropDownList(Sheet taskInfoSheet, DataValidationHelper helper, String[] list,Integer firstRow, Integer lastRow, Integer firstCol, Integer lastCol) {//获取需要生成下拉框的格CellRangeAddressList addressList = new CellRangeAddressList(firstRow, lastRow, firstCol, lastCol);//设置下拉框数据DataValidationConstraint constraint = helper.createExplicitListConstraint(list);DataValidation dataValidation = helper.createValidation(constraint, addressList);//处理Excel兼容性问题if (dataValidation instanceof XSSFDataValidation) {dataValidation.setSuppressDropDownArrow(true);dataValidation.setShowErrorBox(true);} else {dataValidation.setSuppressDropDownArrow(false);}taskInfoSheet.addValidationData(dataValidation);}
使用：
//创建HSSFWorkbook对象(excel的文档对象)XSSFWorkbook wb = new XSSFWorkbook();//建立新的sheet对象（excel的表单）XSSFSheet sheet = wb.createSheet("人员表");DataValidationHelper helper=sheet.getDataValidationHelper();String[] dlData = {"A","B","C","D","E","F","G","H"};//参数：表单对象，数据验证对象，下拉框数据，在第几行到第几行带有下拉框，第几列到第几列有下拉框creatDropDownList(sheet,helper,dlData,1,10,6,6);
