poi导出excel时提示功能

DVConstraint constraint = DVConstraint.createCustomFormulaConstraint("BB1");
/* 四个参数分别是：起始行、终止行、起始列、终止列 */
CellRangeAddressList regions = new CellRangeAddressList(firstRow, endRow, firstCol, endCol);
/* 数据有效性对象 */
HSSFDataValidation data_validation_view = new HSSFDataValidation(regions, constraint);
data_validation_view.createPromptBox("日期格式", "日期格式为2020/01/01");
sheet.addValidationData(data_validation_view);