工具类

public class ExcelUtils {public static void setValidation(Sheet sheet, DataValidationHelper helper,DataValidationConstraint constraint,CellRangeAddressList addressList,String msgHead, String msgContext) {DataValidation dataValidation = helper.createValidation(constraint, addressList);dataValidation.setErrorStyle(DataValidation.ErrorStyle.STOP);dataValidation.setShowErrorBox(true);dataValidation.setSuppressDropDownArrow(true);dataValidation.createErrorBox(msgHead, msgContext);sheet.addValidationData(dataValidation);}public static String getRange(Integer offset, Integer rowId, Integer colCount) {char start = (char) ('A' + offset);if (colCount <= 25) {char end = (char) (start + colCount - 1);return "$" + start + "$" + rowId + ":$" + end + "$" + rowId;}char endPrefix = 'A';char endSuffix = 'A';// 26-51之间，包括边界（仅两次字母表计算）或者是51以上if ((colCount - 25) / 26 == 0 || colCount == 51) {// 边界值if ((colCount - 25) % 26 == 0) {endSuffix = (char) ('A' + 25);} else {endSuffix = (char) ('A' + (colCount - 25) % 26 - 1);}} else {if ((colCount - 25) % 26 == 0) {endSuffix = (char) ('A' + 25);endPrefix = (char) (endPrefix + (colCount - 25) / 26 - 1);} else {endSuffix = (char) ('A' + (colCount - 25) % 26 - 1);endPrefix = (char) (endPrefix + (colCount - 25) / 26);}}return "$" + start + "$" + rowId + ":$" + endPrefix + endSuffix + "$" + rowId;}
}

单列选择

public class RoleHandler implements SheetWriteHandler {@Overridepublic void afterSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {CellRangeAddressList cellRangeAddressList = new CellRangeAddressList(1, 500, 8, 8);DataValidationHelper helper = writeSheetHolder.getSheet().getDataValidationHelper();DataValidationConstraint constraint = helper.createExplicitListConstraint(new String[]{"a", "b"});DataValidation dataValidation = helper.createValidation(constraint, cellRangeAddressList);writeSheetHolder.getSheet().addValidationData(dataValidation);}
}

多列级联

public class DeptHandler implements SheetWriteHandler {private static final String HIDE_SHEET_NAME = "hide_sheet";@Overridepublic void afterSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {Workbook workbook = writeWorkbookHolder.getWorkbook();final Sheet hideSheet = workbook.createSheet(HIDE_SHEET_NAME);workbook.setSheetHidden(workbook.getSheetIndex(hideSheet), false);List<Dept> firstDeptList = setNameManage(hideSheet, workbook);setDataAndRule(writeSheetHolder, firstDeptList);}private List<Dept> setNameManage(Sheet hideSheet, Workbook workbook) {Integer rowIndex = NumberUtils.INTEGER_ZERO;Row firstRow = setRowCell(hideSheet.createRow(rowIndex++), rowIndex, "首行首列",null, null, null, false);List<Dept> deptList = SpringUtils.getBean(DeptService.class).list();List<Dept> firstDeptList = deptList.stream().filter(dept -> !Optional.ofNullable(dept.getParentId()).isPresent()).collect(Collectors.toList());for (int i = 0; i < firstDeptList.size(); ++i) {Dept firstDept = firstDeptList.get(i);Cell firstCell = firstRow.createCell(i + 1);firstCell.setCellValue(firstDept.getName());List<Dept> secondDeptList = deptList.stream().filter(d -> firstDept.getId().equals(d.getParentId())).collect(Collectors.toList());if (ObjectUtils.isNotEmpty(secondDeptList)) {Row secondRow = setRowCell(hideSheet.createRow(rowIndex++), rowIndex, firstDept.getName(),secondDeptList.size(), workbook, firstDept.getName(), true);for (int j = 0; j < secondDeptList.size(); ++j) {Dept secondDept = secondDeptList.get(j);Cell secondCell = secondRow.createCell(j + 1);secondCell.setCellValue(secondDept.getName());List<Dept> thirdDeptList = deptList.stream().filter(d -> secondDept.getId().equals(d.getParentId())).collect(Collectors.toList());if (ObjectUtils.isNotEmpty(thirdDeptList)) {Row thirdRow = setRowCell(hideSheet.createRow(rowIndex++), rowIndex, secondDept.getName(),thirdDeptList.size(), workbook, secondDept.getName(), true);for (int k = 0; k < thirdDeptList.size(); ++k) {Dept thirdDept = thirdDeptList.get(k);Cell thirdCell = thirdRow.createCell(k + 1);thirdCell.setCellValue(thirdDept.getName());}}}}}return firstDeptList;}private Row setRowCell(Row row, Integer rowIndex,String cellValue, Integer size,Workbook workbook, String nameName,boolean ifNeed) {row.createCell(NumberUtils.INTEGER_ZERO).setCellValue(cellValue);if (ifNeed) {final String range = ExcelUtils.getRange(NumberUtils.INTEGER_ONE, rowIndex, size);Name name = workbook.createName();name.setNameName(nameName);name.setRefersToFormula(HIDE_SHEET_NAME + "!" + range);}return row;}private void setDataAndRule(WriteSheetHolder writeSheetHolder, List<Dept> firstDeptList) {Sheet sheet = writeSheetHolder.getSheet();DataValidationHelper helper = sheet.getDataValidationHelper();final String messageHead = "提示";final String messageContext = "你输入的值未在备选列表中，请下拉选择合适的值";ExcelUtils.setValidation(sheet, helper, helper.createExplicitListConstraint(firstDeptList.stream().map(Dept::getName).toArray(String[]::new)),new CellRangeAddressList(1, 500, 5, 5), messageHead, messageContext);for (int i = 2; i < 501; ++i) {ExcelUtils.setValidation(sheet, helper,helper.createFormulaListConstraint("INDIRECT($F$" + i + ")"),new CellRangeAddressList(i - 1, i - 1, 6, 6), messageHead, messageContext);ExcelUtils.setValidation(sheet, helper,helper.createFormulaListConstraint("INDIRECT($G$" + i + ")"),new CellRangeAddressList(i - 1, i - 1, 7, 7), messageHead, messageContext);}}
}