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php做网站的好处,百度seo怎么关闭,vue.js网站建设,济南疫情最新情况地图分布需求背景：有一个需求要做下拉框的值有100多条，同时这个excel是一个多sheet的导入模板直接用easyexcel 导出，会出现下拉框的值过多，导致生成出来的excel模板无法正常展示下拉功能使用的easyexcel版本：<depende…

需求背景：有一个需求要做下拉框的值有100多条，同时这个excel是一个多sheet的导入模板
直接用easyexcel 导出，会出现下拉框的值过多，导致生成出来的excel模板无法正常展示下拉功能

使用的easyexcel版本：<dependency><groupId>com.alibaba</groupId><artifactId>easyexcel</artifactId><version>2.2.6</version>
</dependency>

自定义处理器package com.manager.utils;import com.alibaba.excel.write.handler.SheetWriteHandler;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.metadata.holder.WriteWorkbookHolder;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddressList;
import java.util.Map;/*** 解决使用 easyExcel导出模板，下拉框数据超长，导出模板后，下拉框数据不展示问题* @author yjj* @date 2025/02/18 10:16**/
public class EasyExcelCellWriteHandler implements SheetWriteHandler {public static final String SHEET_NAME = "下拉框隐藏表hidden";/*** 设置阈值，避免生成的导入模板下拉值获取不到*/private static final Integer LIMIT_NUMBER = 50;private Map<Integer, String[]> map = null;public EasyExcelCellWriteHandler(Map<Integer, String[]> map) {this.map = map;}@Overridepublic void beforeSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {}@Overridepublic void afterSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {// 这里可以对cell进行任何操作Sheet sheet = writeSheetHolder.getSheet();DataValidationHelper helper = sheet.getDataValidationHelper();Class<?> headClass = writeSheetHolder.getClazz();// k 为存在下拉数据集的单元格下表 v为下拉数据集map.forEach((k, v) -> {System.out.println("Key = " + k + ", Value = " + v);// 设置下拉单元格的首行 末行 首列 末列CellRangeAddressList rangeList = new CellRangeAddressList(EasyExcelUtils.headRowNumber(headClass), 65536,k,k);// 如果下拉值总数大于50，则使用一个新sheet存储，避免生成的导入模板下拉值获取不到if (v.length > LIMIT_NUMBER) {//定义sheet的名称//1.创建一个隐藏的sheet 名称为 hidden + kString sheetName = SHEET_NAME +sheet.getSheetName() + k;Workbook workbook = writeWorkbookHolder.getWorkbook();Sheet hiddenSheet = workbook.createSheet(sheetName);for (int i = 0, length = v.length; i < length; i++) {// 开始的行数i，列数khiddenSheet.createRow(i).createCell(k).setCellValue(v[i]);}Name category1Name = workbook.createName();category1Name.setNameName(sheetName);String excelLine = getExcelLine(k);// =hidden!$H:$1:$H$50  sheet为hidden的 H1列开始H50行数据获取下拉数组String refers = "=" + sheetName + "!$" + excelLine + "$1:$" + excelLine + "$" + (v.length + 1);// 将刚才设置的sheet引用到你的下拉列表中DataValidationConstraint constraint = helper.createFormulaListConstraint(refers);DataValidation dataValidation = helper.createValidation(constraint, rangeList);writeSheetHolder.getSheet().addValidationData(dataValidation);// 设置存储下拉列值得sheet为隐藏int hiddenIndex = workbook.getSheetIndex(sheetName);if (!workbook.isSheetHidden(hiddenIndex)) {workbook.setSheetHidden(hiddenIndex, true);}}// 下拉列表约束数据DataValidationConstraint constraint = helper.createExplicitListConstraint(v);// 设置约束DataValidation validation = helper.createValidation(constraint, rangeList);// 阻止输入非下拉选项的值validation.setErrorStyle(DataValidation.ErrorStyle.STOP);validation.setShowErrorBox(true);validation.setSuppressDropDownArrow(true);validation.createErrorBox("提示", "此值与单元格定义格式不一致");// validation.createPromptBox("填写说明：","填写内容只能为下拉数据集中的单位，其他单位将会导致无法入仓");sheet.addValidationData(validation);});}/*** 返回excel列标A-Z-AA-ZZ** @param num 列数* @return java.lang.String*/private String getExcelLine(int num) {String line = "";int first = num / 26;int second = num % 26;if (first > 0) {line = (char) ('A' + first - 1) + "";}line += (char) ('A' + second) + "";return line;}}

导出工具类/*** 支持超长下拉框展示* 下载导入模板 - 支持多sheet*/public static void writeTemplateBoxTooLong(HttpServletResponse response, ExcelModel excelModel) {ExcelWriter excelWriter = null;try {excelWriter = EasyExcel.write(outputStream(excelModel.getFileName(), response)).registerConverter(new DateConverter()).useDefaultStyle(false).build();List<ExcelModel.Sheet<?>> sheets = excelModel.getSheets();for (int i = 0; i < sheets.size(); i++) {ExcelModel.Sheet<?> sheet = sheets.get(i);WriteSheet writeSheet;if (ExtraOption.class.isAssignableFrom(sheet.getHeadClass())) {writeSheet = EasyExcel.writerSheet(i, sheet.getSheetName()).registerWriteHandler(new LongestMatchColumnWidthStyleStrategy()).registerWriteHandler(HorizontalCellStyleStrategyFactory.optStyleStrategy()).head(sheet.getHeadClass()).sheetName(sheet.getSheetName()).build();} else {Map<Integer, String[]> map = buildExcelDropDownSetField(sheet.getHeadClass());writeSheet = EasyExcel.writerSheet(i, sheet.getSheetName()).registerWriteHandler(new LongestMatchColumnWidthStyleStrategy()).registerWriteHandler(new EasyExcelCellWriteHandler(map)).registerWriteHandler(new ImportTempleRowWriteHandler()).registerWriteHandler(new ImportTempleCellWriteHandler()).head(sheet.getHeadClass()).sheetName(sheet.getSheetName()).relativeHeadRowIndex(RELATIVE_HEAD_ROW_INDEX).includeColumnFiledNames(sheet.getIncludeFiledNames()).build();}excelWriter.write(sheet.getData(), writeSheet);}} catch (Exception e) {Throwable cause = Throwables.getRootCause(e);log.error("下载模板失败：{}", cause.getMessage(), cause);throw new ServiceException("下载模板失败：{0}", cause.getMessage());} finally {if (excelWriter != null) {excelWriter.finish();}}}

 /*** 批量导入 - 支持多sheet*/@SuppressWarnings("rawtypes")public static Map<Class<?>, List<?>> readMultiSheet(MultipartFile file, Class<?>... classes) {Map<Class<?>, List<?>> resultMap = Maps.newHashMapWithExpectedSize(classes.length + 1);try {checkExcelFile(file);ByteArrayInputStream inputStream = deleteHiddenSheets(file);ExcelReader excelReader = EasyExcel.read(inputStream).build();for (int i = 0; i < classes.length; i++) {Class clazz = classes[i];SimpleAnalysisEventListener listener = SimpleAnalysisEventListener.factory(true);ReadSheet readSheet = EasyExcel.readSheet(i).head(clazz).registerReadListener(listener).headRowNumber(headRowNumber(clazz)).build();excelReader.read(readSheet);resultMap.put(clazz, listener.getResults());}if (resultMap.values().stream().allMatch(CollectionUtils::isEmpty)) {throw new ServiceException("请至少录入一条数据");}} catch (Exception e) {Throwable cause = Throwables.getRootCause(e);log.error("解析异常：{}", cause.getMessage(), cause);throw new ServiceException("解析异常：{0}", cause.getMessage());}return resultMap;}//删除导出模板时生成的隐藏sheet,避免导入时读取带隐藏sheet报错public static ByteArrayInputStream deleteHiddenSheets(MultipartFile file){try (InputStream inputStream = file.getInputStream();ByteArrayOutputStream outputStream = new ByteArrayOutputStream();){Workbook workbook = new XSSFWorkbook(inputStream);for (int i = 0; i < workbook.getNumberOfSheets(); i++) {Sheet sheet = workbook.getSheetAt(i);if (sheet.getSheetName().contains(EasyExcelCellWriteHandler.SHEET_NAME)) {workbook.removeSheetAt(i);i--;  // 因为删除了一个sheet，索引需要调整}}workbook.write(outputStream);workbook.close();return new ByteArrayInputStream(outputStream.toByteArray());} catch (IOException e) {log.error("解析excel失败！",e);throw new ServiceException("解析失败！");}}