POI建立Excel下拉列表框來設定表格資料有效性，這裡需要使用幾個重要的物件，關係依賴圖如下

1.  XSSFDataValidationHelper 工具類
2. XSSFDataValidationConstraint 設定資料有效性條件
3. CellRangeAddressList 設定有效區域
4. XSSFDataValidation 資料有效性物件，工具類1通過2和3來建立

具體程式碼可以參考如下

// 建立工作薄
XSSFWorkbook workbook = new XSSFWorkbook();
XSSFSheet sheet = workbook.createSheet("下拉列表框");
XSSFDataValidationHelper dvHelper = new XSSFDataValidationHelper(sheet);
XSSFDataValidationConstraint dvConstraint = (XSSFDataValidationConstraint) dvHelper
		.createExplicitListConstraint(new String[] { "男", "女" });
// 設定區域邊界
CellRangeAddressList addressList = new CellRangeAddressList(0, 10, 0, 0);
XSSFDataValidation validation = (XSSFDataValidation) dvHelper
		.createValidation(dvConstraint, addressList);
// 輸入非法資料時，彈窗警告框
validation.setShowErrorBox(true);
// 設定提示框
validation.createPromptBox("溫馨提示", "請選擇性別！！!");
validation.setShowPromptBox(true);
sheet.addValidationData(validation);
FileOutputStream out = new FileOutputStream(filePath);
workbook.write(out);
out.close();