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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.util.CellRangeAddressList /** * CustomSheetWriteHandler * @Auther: mtx * @Date: 2024/04/08 14:45 */ class CustomSheetWriteHandler : SheetWriteHandler { /** * key:下拉选项要放到哪个单元格,比如A列的单元格那就是0,C列的单元格,那就是2 * value:key对应的那个单元格下拉列表里的数据项,比如这里就是下拉选项1..100 */ lateinit var selectParamMap: Map<Int, List<String>> companion object { fun build(selectParamMap: Map<Int, List<String>>): CustomSheetWriteHandler { return CustomSheetWriteHandler().apply { this.selectParamMap = selectParamMap } } } override fun beforeSheetCreate(writeWorkbookHolder: WriteWorkbookHolder, writeSheetHolder: WriteSheetHolder) { } /** * 想实现Excel引用其他sheet页数据作为单元格下拉选项值 */ override fun afterSheetCreate(writeWorkbookHolder: WriteWorkbookHolder, writeSheetHolder: WriteSheetHolder) { // 获取第一个sheet页 val sheet = writeSheetHolder.cachedSheet // 获取sheet页的数据校验对象 val helper = sheet.dataValidationHelper // 获取工作簿对象,用于创建存放下拉数据的字典sheet数据页 val workbook = writeWorkbookHolder.workbook // 迭代索引,用于存放下拉数据的字典sheet数据页命名 var index = 1 selectParamMap.forEach { // 设置存放下拉数据的字典sheet,并把这些sheet隐藏掉,这样用户交互更友好 val dictSheetName = "option_$index" val dictSheet = workbook.createSheet(dictSheetName) // 隐藏字典sheet页 workbook.setSheetHidden(index++, true) // 设置下拉列表覆盖的行数,从第一行开始到最后一行,这里注意,Excel行的 // 索引是从0开始的,我这边第0行是标题行,第1行开始时数据化,可根据实际业务设置真正的数据开始行, // 如果要设置到最后一行,那么一定注意,最后一行的行索引是1048575,千万别写成1048576,不然会导致下拉列表失效,出不来 val infoList = CellRangeAddressList(1, 1048575, it.key, it.key) val rowLen = it.value.size it.value.forEachIndexed { index, s -> // 向字典sheet写数据,从第一行开始写,此处可根据自己业务需要,自定 // 义从第几行还是写,写的时候注意一下行索引是从0开始的即可 dictSheet.createRow(index).createCell(0).setCellValue(s) } val name = workbook.createName() // 设置关联数据公式,这个格式跟Excel设置有效性数据的表达式是一样的 name.nameName = dictSheetName // 将关联公式和sheet页做关联 name.refersToFormula = "$dictSheetName!\$A$1:\$A\$$rowLen" // 将上面设置好的下拉列表字典sheet页和目标sheet关联起来 val constraint = helper.createFormulaListConstraint(dictSheetName) val dataValidation = helper.createValidation(constraint, infoList) dataValidation.showErrorBox = true dataValidation.createErrorBox("错误提示","您输入的内容不符合限制条件。") sheet.addValidationData(dataValidation) } } }
java版
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.DataValidation; import org.apache.poi.ss.usermodel.DataValidationConstraint; import org.apache.poi.ss.usermodel.DataValidationHelper; import org.apache.poi.ss.usermodel.Name; import org.apache.poi.ss.usermodel.Sheet; import org.apache.poi.ss.usermodel.Workbook; import org.apache.poi.ss.util.CellRangeAddressList; import java.util.List; import java.util.Map; /** * CustomSheetWriteHandler * * @author 马天祥 * @Date: 2024/04/10 14:01 */ public class CustomSheetWriteHandler implements SheetWriteHandler { /** * key:下拉选项要放到哪个单元格,比如A列的单元格那就是0,C列的单元格,那就是2 * value:key对应的那个单元格下拉列表里的数据项,比如这里就是下拉选项1..100 */ private final Map<Integer, List<String>> selectParamMap; public CustomSheetWriteHandler(Map<Integer, List<String>> selectParamMap) { this.selectParamMap = selectParamMap; } @Override public void beforeSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) { } /** * 想实现Excel引用其他sheet页数据作为单元格下拉选项值 */ @Override public void afterSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) { // 获取第一个sheet页 Sheet sheet = writeSheetHolder.getCachedSheet(); // 获取sheet页的数据校验对象 DataValidationHelper helper = sheet.getDataValidationHelper(); // 获取工作簿对象,用于创建存放下拉数据的字典sheet数据页 Workbook workbook = writeWorkbookHolder.getWorkbook(); // 迭代索引,用于存放下拉数据的字典sheet数据页命名 int index = 1; for (Map.Entry<Integer, List<String>> entry : selectParamMap.entrySet()) { // 设置存放下拉数据的字典sheet,并把这些sheet隐藏掉,这样用户交互更友好 String dictSheetName = "option_" + index; Sheet dictSheet = workbook.createSheet(dictSheetName); // 隐藏字典sheet页 workbook.setSheetHidden(index++, true); // 设置下拉列表覆盖的行数,从第一行开始到最后一行,这里注意,Excel行的 // 索引是从0开始的,我这边第0行是标题行,第1行开始时数据化,可根据实际业务设置真正的数据开始行, // 如果要设置到最后一行,那么一定注意,最后一行的行索引是1048575,千万别写成1048576,不然会导致下拉列表失效,出不来 CellRangeAddressList infoList = new CellRangeAddressList(1, 1048575, entry.getKey(), entry.getKey()); int rowLen = entry.getValue().size(); for (int i = 0; i < rowLen; i++) { // 向字典sheet写数据,从第一行开始写,此处可根据自己业务需要,自定 // 义从第几行还是写,写的时候注意一下行索引是从0开始的即可 dictSheet.createRow(i).createCell(0).setCellValue(entry.getValue().get(i)); } // 设置关联数据公式,这个格式跟Excel设置有效性数据的表达式是一样的 String refers = dictSheetName + "!$A$1:$A$" + entry.getValue().size(); Name name = workbook.createName(); name.setNameName(dictSheetName); // 将关联公式和sheet页做关联 name.setRefersToFormula(refers); // 将上面设置好的下拉列表字典sheet页和目标sheet关联起来 DataValidationConstraint constraint = helper.createFormulaListConstraint(dictSheetName); DataValidation dataValidation = helper.createValidation(constraint, infoList); dataValidation.setShowErrorBox(true); dataValidation.createErrorBox("错误提示","您输入的内容不符合限制条件。"); sheet.addValidationData(dataValidation); } } }
kotlin
@PostMapping(value = ["/download-template"]) @ApiOperation(value = "下载模板", notes = "下载模板") fun downloadTemplate(response: HttpServletResponse) { response.contentType = "application/vnd.ms-excel" response.characterEncoding = "utf-8" // 这里URLEncoder.encode可以防止中文乱码 当然和easyexcel没有关系 val fileName = URLEncoder.encode("导入模板" + DateUtil.time(), "UTF-8") response.setHeader("Content-disposition", "attachment;filename=$fileName.xlsx") val map = mutableMapOf<Int, List<String>>() // 承包商名称 第一列A列 map[0] = listOf("选项1","选项2") EasyExcel.write(response.outputStream, Entry::class.java) .registerWriteHandler(CustomSheetWriteHandler.build(map)) .sheet("模板").doWrite(listOf<String>()) }
java
@PostMapping(value = "/download-template") @ApiOperation(value = "下载模板", notes = "下载模板") public void downloadTemplate(HttpServletResponse response) throws IOException { response.setContentType("application/vnd.ms-excel"); response.setCharacterEncoding("utf-8"); // 这里URLEncoder.encode可以防止中文乱码 当然和easyexcel没有关系 URLEncoder.encode("导入模板" + DateUtil.time(), StandardCharsets.UTF_8); response.setHeader("Content-disposition", "attachment;filename=$fileName.xlsx"); Map<Integer, List<String>> map = new HashMap<>(); // 承包商名称 第一列A列 map.put(0, Arrays.asList("选项1","选项2")); EasyExcel.write(response.getOutputStream()) .registerWriteHandler(new CustomSheetWriteHandler(map)) .sheet("模板").doWrite(new ArrayList<>()); }
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