Excel导出级联下拉功能实现

效果如下:

直接上代码，自己看

工具类：

import cn.hutool.core.util.ObjectUtil;
import com.alibaba.fastjson.JSONObject;
import lombok.extern.slf4j.Slf4j;
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.ss.util.CellRangeAddressList;
import org.hj.chain.platform.vo.check.CheckFactorInfoVo;
import org.hj.chain.platform.vo.check.CheckFactorSubsetVo;import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.math.BigDecimal;
import java.util.*;
import java.util.concurrent.atomic.AtomicInteger;@Slf4j
public class PoiUtil<T> {private static final String MAIN_SHEET = "信息";private static final String SHEET_MAP = "仪器";/*** 计算formula** @param offset   偏移量，如果给0，表示从A列开始，1，就是从B列* @param rowId    第几行* @param colCount 一共多少列* @return 如果给入参 1,1,10. 表示从B1-K1。最终返回 $B$1:$K$1*/private static String getRange(int offset, int rowId, int colCount) {char start = (char) ('A' + offset);if (colCount <= 25) {char end = (char) (start + colCount - 1);return "$" + start + "$" + rowId + ":$" + end + "$" + rowId;} else {char endPrefix = 'A';char endSuffix = 'A';if ((colCount - 25) / 26 == 0 || colCount == 51) {// 26-51之间，包括边界（仅两次字母表计算）if ((colCount - 25) % 26 == 0) {// 边界值endSuffix = (char) ('A' + 25);} else {endSuffix = (char) ('A' + (colCount - 25) % 26 - 1);}} else {// 51以上if ((colCount - 25) % 26 == 0) {endSuffix = (char) ('A' + 25);endPrefix = (char) (endPrefix + (colCount - 25) / 26 - 1);} else {endSuffix = (char) ('A' + (colCount - 25) % 26 - 1);endPrefix = (char) (endPrefix + (colCount - 25) / 26);}}return "$" + start + "$" + rowId + ":$" + endPrefix + endSuffix + "$" + rowId;}}//-----------------------------------------------------------/*** 导出三级联动and单个下拉框的excel** @param name       文件名称* @param headers    表头* @param mapOneList 一级所有内容* @param map        三级联动对应内容* @param list       导出数据*/public static <T> void export(HttpServletResponse response, String name, List<String> headers, List<String> mapOneList, Map<String, LinkedList<String>> map, List<T> list) {// 1.创建Excel// 1)创建workbookHSSFWorkbook hssfWorkBook = new HSSFWorkbook();// 2)创建sheetHSSFSheet mainSheet = hssfWorkBook.createSheet(MAIN_SHEET);// 主sheetAtomicInteger add = new AtomicInteger();//获取行数for (int i = 0; i < list.size(); i++) {CheckFactorInfoVo checkFactorInfoVo = (CheckFactorInfoVo) list.get(i);if ("1".equals(checkFactorInfoVo.getIsFactor())) {if (ObjectUtil.isNotEmpty(checkFactorInfoVo.getFactorSubsetVos())) {add.addAndGet(checkFactorInfoVo.getFactorSubsetVos().size());} else {add.addAndGet(1);}} else {add.addAndGet(1);}}// 用于展示//2 创建表头，供用户输入initHeaders(hssfWorkBook, mainSheet, headers);//导出数据到主sheetsetMainSheet(mainSheet, list);//三级联动 sheetHSSFSheet mapSheet = hssfWorkBook.createSheet(SHEET_MAP);// true:隐藏/false:显示//仪器关系sheethssfWorkBook.setSheetHidden(hssfWorkBook.getSheetIndex(mapSheet), true);// 设置sheet是否隐藏// 3.写入数据writeData(hssfWorkBook, mapSheet, mapOneList, map);// 将数据写入隐藏的sheet中并做好关联关系// 4.设置数据有效性setDataValid(hssfWorkBook, mainSheet, mapOneList, map, add.get());response.reset();try (OutputStream output = response.getOutputStream()) {response.setContentType("application/octet-stream;charset=utf-8");response.setHeader("Content-Disposition", "attachment; filename=" + name);output.flush();hssfWorkBook.write(output);} catch (IOException e) {log.error("导出失败!");e.printStackTrace();}response.setCharacterEncoding("UTF-8");}/*** 生成主页面表头** @param wb* @param mainSheet* @param headers*/private static void initHeaders(HSSFWorkbook wb, HSSFSheet mainSheet, List<String> headers) {//表头样式HSSFCellStyle style = wb.createCellStyle();style.setAlignment(HorizontalAlignment.CENTER); // 创建一个居中格式//字体样式HSSFFont fontStyle = wb.createFont();fontStyle.setFontName("微软雅黑");fontStyle.setFontHeightInPoints((short) 12);fontStyle.setBold(true);style.setFont(fontStyle);//生成主内容HSSFRow rowFirst = mainSheet.createRow(0);//第一个sheet的第一行为标题mainSheet.createFreezePane(0, 1, 0, 1); //冻结第一行CellRangeAddress region1 = new CellRangeAddress(0, 0, 5, 6);CellRangeAddress region2 = new CellRangeAddress(0, 0, 9, 11);mainSheet.addMergedRegion(region1);mainSheet.addMergedRegion(region2);//写标题for (int i = 0; i < headers.size(); i++) {HSSFCell cell;if (i < 6) {cell = rowFirst.createCell(i); //获取第一行的每个单元格} else if (i >= headers.size() - 3) {cell = rowFirst.createCell(i + 3);} else {cell = rowFirst.createCell(i + 1);}mainSheet.setColumnWidth(i, 4000); //设置每列的列宽if (i == 3) {mainSheet.setColumnWidth(i, 6000);}cell.setCellStyle(style); //加样式cell.setCellValue(headers.get(i)); //往单元格里写数据}}private static <T> void setMainSheet(HSSFSheet mainSheet, List<T> list) {HSSFCellStyle style = mainSheet.getWorkbook().createCellStyle();style.setVerticalAlignment(VerticalAlignment.CENTER); // 创建一个居中格式HSSFFont font = mainSheet.getWorkbook().createFont();font.setFontName("宋体");style.setFont(font);//同系套餐因子占用的总行数AtomicInteger add = new AtomicInteger();for (int j = 0; j < list.size(); j++) {//行Row row = mainSheet.createRow(j + 1 + add.get());CheckFactorInfoVo obj = (CheckFactorInfoVo) list.get(j);if (obj != null) {//因子数据填充if (!"1".equals(obj.getIsFactor())) {for (int i = 0; i <= 13; i++) {Cell cell = row.createCell(i);cell.setCellStyle(style);switch (i) {case 0:cell.setCellValue(obj.getSampleNo());break;case 1:case 5:cell.setCellValue(obj.getFactorName());break;case 2:cell.setCellValue(obj.getStandardNo());break;case 3:cell.setCellValue(obj.getStandardName());break;case 4:cell.setCellValue(obj.getFactorRemark());break;case 6:if (ObjectUtil.isNotNull(obj.getCheckRes())) {JSONObject jsonObject = JSONObject.parseObject(obj.getCheckRes());String v1 = jsonObject.getString("v1");String v2 = jsonObject.getString("v2");if (ObjectUtil.isNull(v2)|| "".equals(v2)) {cell.setCellValue(v1);} else {String initial = getInitial(v1, v2);cell.setCellValue(initial);}}break;case 7:cell.setCellValue(obj.getUnitName());break;case 8:if (ObjectUtil.isNotNull(obj.getRemark())) {cell.setCellValue(obj.getRemark());}break;case 9:if (ObjectUtil.isNotNull(obj.getCheckEquipment())) {JSONObject jsonObject = JSONObject.parseObject(obj.getCheckEquipment());cell.setCellValue(jsonObject.getString("equipmentName"));}break;case 10:if (ObjectUtil.isNotNull(obj.getCheckEquipment())) {JSONObject jsonObject = JSONObject.parseObject(obj.getCheckEquipment());cell.setCellValue(jsonObject.getString("equipmentModel"));}break;case 11:if (ObjectUtil.isNotNull(obj.getCheckEquipment())) {JSONObject jsonObject = JSONObject.parseObject(obj.getCheckEquipment());cell.setCellValue(jsonObject.getString("equipmentNumber"));}break;case 12:cell.setCellValue(obj.getCheckFactorId());break;case 13:cell.setCellValue("1".equals(obj.getIsFactor()) ? "是" : "否");break;}}} else {//套餐内容填充for (int i = 0; i < 5; i++) {Cell cell = row.createCell(i);cell.setCellStyle(style);switch (i) {case 0:cell.setCellValue(obj.getSampleNo());break;case 1:cell.setCellValue(obj.getFactorName());break;case 2:cell.setCellValue(obj.getStandardNo());break;case 3:cell.setCellValue(obj.getStandardName());break;case 4:cell.setCellValue(obj.getFactorRemark());break;}}List<CheckFactorSubsetVo> factorSubsetVos = obj.getFactorSubsetVos();row.createCell(12).setCellValue(obj.getCheckFactorId());//套餐因子填充if (ObjectUtil.isNotEmpty(factorSubsetVos)) {for (int i = 0; i < factorSubsetVos.size(); i++) {if (i != 0) {row = mainSheet.createRow(j + 1 + add.get() + i);}//填充因子名称Cell cell5 = row.createCell(5);cell5.setCellValue(factorSubsetVos.get(i).getFactorName());cell5.setCellStyle(style);Cell cell7 = row.createCell(7);cell7.setCellValue(factorSubsetVos.get(i).getUnitName());cell7.setCellStyle(style);Cell cell12 = row.createCell(12);cell12.setCellValue(obj.getCheckFactorId());cell12.setCellStyle(style);Cell cell13 = row.createCell(13);cell13.setCellValue("1".equals(obj.getIsFactor()) ? "是" : "否");cell13.setCellStyle(style);Cell cell14 = row.createCell(14);cell14.setCellValue(factorSubsetVos.get(i).getId());cell14.setCellStyle(style);if (ObjectUtil.isNotNull(factorSubsetVos.get(i).getCheckSubRes())) {JSONObject jsonObject = JSONObject.parseObject(factorSubsetVos.get(i).getCheckSubRes());String v1 = jsonObject.getString("v1");String v2 = jsonObject.getString("v2");Cell cell6 = row.createCell(6);if (ObjectUtil.isNull(v2)|| "".equals(v2)) {cell6.setCellValue(v1);} else {String initial = getInitial(v1, v2);cell6.setCellValue(initial);}cell6.setCellStyle(style);}if (ObjectUtil.isNotNull(obj.getRemark())) {Cell cell8 = row.createCell(8);cell8.setCellStyle(style);cell8.setCellValue(obj.getRemark());}if (ObjectUtil.isNotNull(obj.getCheckEquipment())) {JSONObject jsonObject = JSONObject.parseObject(obj.getCheckEquipment());Cell cell9 = row.createCell(9);cell9.setCellStyle(style);cell9.setCellValue(jsonObject.getString("equipmentName"));Cell cell10 = row.createCell(10);cell10.setCellStyle(style);cell10.setCellValue(jsonObject.getString("equipmentModel"));Cell cell11 = row.createCell(11);cell11.setCellStyle(style);cell11.setCellValue(jsonObject.getString("equipmentNumber"));}}}//累加套餐因子所占行数int oldAdd = add.getAndAdd(factorSubsetVos.size() - 1);// 四个参数分别是：起始行、终止行、起始列、终止列.CellRangeAddress region1 = new CellRangeAddress(j + oldAdd + 1, j + add.get() + 1, 0, 0);CellRangeAddress region2 = new CellRangeAddress(j + oldAdd + 1, j + add.get() + 1, 1, 1);CellRangeAddress region3 = new CellRangeAddress(j + oldAdd + 1, j + add.get() + 1, 2, 2);CellRangeAddress region4 = new CellRangeAddress(j + oldAdd + 1, j + add.get() + 1, 3, 3);CellRangeAddress region5 = new CellRangeAddress(j + oldAdd + 1, j + add.get() + 1, 4, 4);CellRangeAddress region6 = new CellRangeAddress(j + oldAdd + 1, j + add.get() + 1, 8, 8);CellRangeAddress region7 = new CellRangeAddress(j + oldAdd + 1, j + add.get() + 1, 9, 9);CellRangeAddress region8 = new CellRangeAddress(j + oldAdd + 1, j + add.get() + 1, 10, 10);CellRangeAddress region9 = new CellRangeAddress(j + oldAdd + 1, j + add.get() + 1, 11, 11);mainSheet.addMergedRegion(region1);mainSheet.addMergedRegion(region2);mainSheet.addMergedRegion(region3);mainSheet.addMergedRegion(region4);mainSheet.addMergedRegion(region5);mainSheet.addMergedRegion(region6);mainSheet.addMergedRegion(region7);mainSheet.addMergedRegion(region8);mainSheet.addMergedRegion(region9);}}mainSheet.setColumnHidden(12, true);mainSheet.setColumnHidden(13, true);mainSheet.setColumnHidden(14, true);}}private static void setDataValid(HSSFWorkbook HSSFWorkBook, HSSFSheet mainSheet, List<String> firstList, Map<String, LinkedList<String>> siteMap, Integer line) {//设置一级下拉HSSFDataValidationHelper dvHelper = new HSSFDataValidationHelper((HSSFSheet) mainSheet);String[] dataArray = firstList.toArray(new String[0]);HSSFSheet hidden = HSSFWorkBook.createSheet("hidden");HSSFCell cell = null;for (int i = 0, length = dataArray.length; i < length; i++) {String name = dataArray[i];HSSFRow row = hidden.createRow(i);cell = row.createCell(0);cell.setCellValue(name);}Name namedCell = HSSFWorkBook.createName();namedCell.setNameName("hidden");namedCell.setRefersToFormula("hidden!$A$1:$A$" + dataArray.length);//加载数据,将名称为hidden的DVConstraint constraint = DVConstraint.createFormulaListConstraint("hidden");// 四个参数分别是：起始行、终止行、起始列、终止列.// 1 (一级下拉框代表从excel第1+1行开始) line(一级下拉框代表从excel第1+10行结束) 9(代表第几列开始，0是第一列，1是第二列) 1(代表第几列结束，0是第一列，1是第二列)CellRangeAddressList firstRangeAddressList = new CellRangeAddressList(1, line, 9, 9);DataValidation firstDataValidation = dvHelper.createValidation(constraint, firstRangeAddressList);firstDataValidation.createErrorBox("error", "请选择正确");firstDataValidation.setShowErrorBox(true);// firstDataValidation.setSuppressDropDownArrow(true);//将第二个sheet设置为隐藏// true:隐藏/false:显示HSSFWorkBook.setSheetHidden(HSSFWorkBook.getSheetIndex(hidden), true);// 设置sheet是否隐藏
//        HSSFWorkBook.setSheetHidden(1, true);mainSheet.addValidationData(firstDataValidation);// 设置第二级、第三级下拉// i <= 10 ,10代表第二级、第三级下拉框到10+1行结束for (int i = 0; i <= 10; i++) {setDataValidation('J', mainSheet, i + 1, 10);// "J"是指父类所在的列，i+1初始值为1代表从第2行开始，10要与“J”对应，为J的列号加1，假如第一个参数为“C”，那么最后一个参数就3}}/*** 设置有效性** @param offset 主影响单元格所在列，即此单元格由哪个单元格影响联动* @param sheet* @param rowNum 行数* @param colNum 列数*/private static void setDataValidation(char offset, HSSFSheet sheet, int rowNum, int colNum) {HSSFDataValidationHelper dvHelper = new HSSFDataValidationHelper(sheet);DataValidation dataValidationList1;DataValidation dataValidationList2;dataValidationList1 = getDataValidationByFormula("INDIRECT($" + offset + (rowNum) + ")", rowNum, colNum, dvHelper);dataValidationList2 = getDataValidationByFormula("INDIRECT($" + (char) (offset + 1) + (rowNum) + ")", rowNum, colNum + 1, dvHelper);sheet.addValidationData(dataValidationList1);sheet.addValidationData(dataValidationList2);}private static DataValidation getDataValidationByFormula(String formulaString, int naturalRowIndex, int naturalColumnIndex, HSSFDataValidationHelper dvHelper) {DataValidationConstraint dvConstraint = dvHelper.createFormulaListConstraint(formulaString);CellRangeAddressList regions = new CellRangeAddressList(naturalRowIndex, 65535, naturalColumnIndex, naturalColumnIndex);HSSFDataValidation data_validation_list = (HSSFDataValidation) dvHelper.createValidation(dvConstraint, regions);data_validation_list.setEmptyCellAllowed(false);if (data_validation_list instanceof HSSFDataValidation) {// data_validation_list.setSuppressDropDownArrow(true);data_validation_list.setShowErrorBox(true);} else {// data_validation_list.setSuppressDropDownArrow(false);}// 设置输入信息提示信息data_validation_list.createPromptBox("下拉选择提示", "请使用下拉方式选择合适的值！");return data_validation_list;}private static void writeData(HSSFWorkbook hssfWorkBook, HSSFSheet mapSheet, List<String> firstList, Map<String, LinkedList<String>> subMap) {//循环将父数据写入siteSheet的第1行中int siteRowId = 0;HSSFRow firstRow = mapSheet.createRow(siteRowId++);firstRow.createCell(0).setCellValue("父列表");for (int i = 0; i < firstList.size(); i++) {firstRow.createCell(i + 1).setCellValue(firstList.get(i));}// 将具体的数据写入到每一行中，行开头为父级区域，后面是子区域。Iterator<String> keyIterator = subMap.keySet().iterator();while (keyIterator.hasNext()) {String key = keyIterator.next();List<String> son = subMap.get(key);HSSFRow siteRow = mapSheet.createRow(siteRowId++);siteRow.createCell(0).setCellValue(key);for (int i = 0; i < son.size(); i++) {siteRow.createCell(i + 1).setCellValue(son.get(i));}// 添加名称管理器String range = getRange(1, siteRowId, son.size());Name name = hssfWorkBook.createName();name.setNameName(key);String formula = mapSheet.getSheetName() + "!" + range;name.setRefersToFormula(formula);}}private static String getInitial(String a, String b) {if (ObjectUtil.isNull(b)|| "".equals(b)) {return a;} else {StringBuffer sb = new StringBuffer();return sb.append(a).append("*").append("10^").append(b).toString();}}}

使用方法:
根据自身业务进行组装数据

    public void export(HttpServletResponse response, CheckFactorSearchVo searchVo) {SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");String dateString = format.format(new Date());//文件名称String name = dateString+".xls";//excel 表头List<String> headers = Arrays.asList("样品编号","检测因子","标准号", "检测标准", "备注信息", "检测结果","单位","备注","检测设备","检测因子id","因子套餐","套餐因子id");JSONArray tree = (JSONArray)equipmentInfoService.laboratoryEquipmentTree().getResult();LinkedList<String> firstList = new LinkedList<>();HashMap<String, LinkedList<String>> subMap = new HashMap();tree.forEach( object->{String firstName = ((JSONObject) object).getString("name");firstList.add(firstName);JSONArray children = ((JSONObject) object).getJSONArray("children");LinkedList<String> subList = new LinkedList<>();children.forEach( subObject ->{String secondName = ((JSONObject) subObject).getString("name");LinkedList<String> thirdList = new LinkedList<>();subList.add(secondName);JSONArray secondChildren = ((JSONObject) subObject).getJSONArray("children");secondChildren.forEach( thirdObject->{String thirdName = ((EquipmentTreeVo)thirdObject).getEquipmentNumber();thirdList.add(thirdName);});subMap.put(secondName,thirdList);});subMap.put(firstName,subList);});PoiUtil.export(response,name,headers,firstList,subMap,factorInfoVos);}

导出内容如下:

有两个隐藏的表格用来实现级联下拉

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Excel导出级联下拉功能实现

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