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问题就是:有的导入复杂表头被合并的单元格有默认空字符串，有的直接不存在这个单元格

实际我需要下面这种情况

断点可以看到这个导入第一行合并了，被合并单元格还有默认的空字符串

解决办法就是在合并单元格里面判断，不是第一行第一列都设置空字符串

之前贴过导入复杂表头，这里再贴一边

package com.njry.modules.system.rest;import com.njry.exception.BadRequestException;
import com.njry.modules.tools.domain.vo.HeaderCell;
import com.njry.modules.tools.domain.vo.HeaderRegion;
import com.njry.modules.system.domain.SysTest;
import com.njry.modules.system.service.SysTestService;
import com.njry.utils.SecurityUtils;
import com.njry.utils.excel.ExcelColorHelper;
import com.njry.utils.excel.HssfHelper;
import com.njry.utils.excel.XssfHelper;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import lombok.RequiredArgsConstructor;
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.hssf.util.HSSFColor;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.usermodel.*;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;import java.util.*;@RestController
@RequiredArgsConstructor
@Api(tags = "工具：本地存储管理")
@RequestMapping("/api/localStorageExcel")
public class testExcelController {private final SysTestService sysTestService;@PostMapping@ApiOperation("上传文件")public ResponseEntity<Object> createFile(@RequestParam String name, @RequestParam("file") MultipartFile file){
//        保存导入表头配置Map<String, String> mp = new HashMap<String, String>();int res = 1;try {if (file == null || file.isEmpty()) {res = -1;}HeaderCell[][] headerCells = null;int typeNumber = checkFile(file);if(typeNumber == 1){headerCells = readXLSX(file);}if(typeNumber == 2){headerCells = readXLS(file);}if(typeNumber == 0 || typeNumber == 3){throw new BadRequestException("上传文件格式不正确");}Map cellMap = getHtmlStr(headerCells, 1);//传1 正序
//            获取表头的后处理父子级关系List cellList = (List)cellMap.get("cellList");int rowNum = (int)cellMap.get("rowNum");//            只有正序的时候才能这样使用for(int i = 0; i < cellList.size(); i++){HashMap<String,Object> hashMap = (HashMap)cellList.get(i);if(hashMap.get("rowfrom").equals(0)){hashMap.put("parentLevel",null);
//                    hashMap.put("leafFlag",0);}else{
//                    判断不是第一行起的父级是谁int rowfrom = convertObjectToInt(hashMap.get("rowfrom")) - 1;int colfrom = convertObjectToInt(hashMap.get("colfrom"));for (int j = 0; j < cellList.size(); j++) {HashMap<String,Object> hashMapInner = (HashMap)cellList.get(j);int rowfrom1 = convertObjectToInt(hashMapInner.get("rowfrom"));int rowto = convertObjectToInt(hashMapInner.get("rowto"));int colfrom1 = convertObjectToInt(hashMapInner.get("colfrom"));int colto = convertObjectToInt(hashMapInner.get("colto"));if(rowfrom >= rowfrom1 && rowfrom <= rowto && colfrom >= colfrom1 && colfrom <= colto){hashMap.put("parentLevel",hashMapInner.get("headid"));
//                            hashMap.put("leafFlag",1);}}}
//                处理leafFlag是最后一行表示叶子节点int rowto = convertObjectToInt(hashMap.get("rowto"));if(rowto == rowNum - 1){hashMap.put("leafFlag",1);}else{hashMap.put("leafFlag",0);}}System.out.println(cellList);for (int k = 0; k < cellList.size(); k++) {HashMap<String,Object> hashMap = (HashMap)cellList.get(k);SysTest resources =  new SysTest();resources.setColfrom((Integer) hashMap.get("colfrom"));resources.setColto((Integer) hashMap.get("colto"));resources.setColspan((Integer) hashMap.get("colspan"));resources.setRowfrom((Integer) hashMap.get("rowfrom"));resources.setRowto((Integer) hashMap.get("rowto"));resources.setRowspan((Integer) hashMap.get("rowspan"));
//                数据库不允许title在插入的时候是null(表头传入有的是空)---修改数据表为nullresources.setTitle((String) hashMap.get("title"));resources.setHeadid((String) hashMap.get("headid"));resources.setParentlevel((String) hashMap.get("parentLevel"));resources.setHeight((Float) hashMap.get("height"));resources.setBgColor((String) hashMap.get("bg_color"));resources.setFontColor((String) hashMap.get("font_color"));resources.setFontHeight((String) hashMap.get("font_height"));resources.setLeafFlag((Integer) hashMap.get("leafFlag"));sysTestService.create(resources);}}catch (Exception e){throw e;
//                res = 0;}mp.put("res", res + "");return new ResponseEntity<>(HttpStatus.CREATED);}public int convertObjectToInt(Object obj) {if (obj instanceof String) {return Integer.parseInt((String) obj);} else if (obj instanceof Integer) {return (Integer) obj;} else {throw new IllegalArgumentException("Object cannot be converted to int");}}public HeaderCell[][] readXLS(MultipartFile file){Workbook wb = null;try{wb = new HSSFWorkbook(file.getInputStream());}catch (Exception ex){}Sheet sheet = wb.getSheetAt(0);return excelToHtml(sheet,wb,1);}public HeaderCell[][] readXLSX(MultipartFile file){Workbook wb = null;try{wb = new XSSFWorkbook(file.getInputStream());}catch (Exception ex){}Sheet sheet = wb.getSheetAt(0);return excelToHtml(sheet,wb,2);}/*** 判断File文件的类型* @param file 传入的文件* @return 0-文件为空，1-XLSX文件，2-XLS文件，3-其他文件*/public int checkFile(MultipartFile file) {if (file == null) {return 0;}String filename = file.getOriginalFilename();String fileSuffix= filename.substring(filename.lastIndexOf("."));if (fileSuffix.endsWith("xlsx")) {return 1;}if (fileSuffix.endsWith("xls")) {return 2;}return 3;}/*** Convert byte[] to hex string.这里我们可以将byte转换成int，然后利用Integer.toHexString(int)*来转换成16进制字符串。* @param src 传入的rbg* @return @return hex string*/public static String bytesToHexString(byte[] src){StringBuilder stringBuilder = new StringBuilder("");if (src == null || src.length <= 0) {return null;}for (int i = 0; i < src.length; i++) {int v = src[i] & 0xFF;String hv = Integer.toHexString(v);if (hv.length() < 2) {stringBuilder.append(0);}stringBuilder.append(hv);}return stringBuilder.toString();}/*** @description 解析表头* @author * @param sheet* @param wb* @param type 1是 HSSFWorkbook 2 是XSSFWorkbook* @return*/@SuppressWarnings({"deprecation", "unchecked", "static-access"})public HeaderCell[][] excelToHtml(Sheet sheet, Workbook wb,int type){//开始解析excelHssfHelper hssfHelper = null;XssfHelper xssfHelper = null;if(type == 1){hssfHelper= new HssfHelper();}if(type == 2){xssfHelper = new XssfHelper();}ExcelColorHelper colorHelper = new ExcelColorHelper();Font headFont;CellStyle headStyle;//获取Sheet中的合并单元格信息(为下文HeaderCell下属性判断使用)HeaderRegion[] headerRegions = new HeaderRegion[sheet.getNumMergedRegions()];for(int k = 0; k < sheet.getNumMergedRegions(); k++){HeaderRegion headerRegion = null;CellRangeAddress region = sheet.getMergedRegion(k);headerRegion = new HeaderRegion();int firstRow = region.getFirstRow();int lastRow = region.getLastRow();int firstColumn = region.getFirstColumn();int lastColumn = region.getLastColumn();headerRegion.setTargetRowFrom(firstRow);headerRegion.setTargetRowTo(lastRow);headerRegion.setTargetColumnFrom(firstColumn);headerRegion.setTargetColumnTo(lastColumn);if(type == 1){HSSFCell cell = (HSSFCell)sheet.getRow(firstRow).getCell(firstColumn);headerRegion.setText(hssfHelper.getCellStringValue(cell));}if(type == 2){XSSFCell cell = (XSSFCell)sheet.getRow(firstRow).getCell(firstColumn);headerRegion.setText(xssfHelper.getCellStringValue(cell));}headerRegion.setColLength(1 + (lastColumn - firstColumn));headerRegion.setRowLength(1 + (lastRow - firstRow));
//            当前合并单元的合并的列数
//            int numberOfCells = region.getNumberOfCells();
//            System.out.println(numberOfCells);
//            合并单元格，被合并单元格没数据设置成默认空字符----getPhysicalNumberOfCells获取不到存在合并行(合并前的)实际列数for (int i = firstRow; i <= lastRow; i++) {for (int j = firstColumn; j <= lastColumn; j++) {
//                    除去第一行一列默认有值，其余全部设置为空字符串if(i == firstRow && j == firstColumn){
//                        第一行第一列啥也不处理}else{
//                        被合并但是有数据默认空字符串不处理Cell cell = sheet.getRow(i).getCell(j);if(cell == null){cell = sheet.getRow(i).createCell(j);cell.setCellValue(""); // 设置单元格为空字符串}}}}headerRegions[k] = headerRegion;}//获取Sheet中的单元格信息int rowNum = sheet.getPhysicalNumberOfRows();
//        获取第一行,得到第一行有多少列,就是excel有多少列(有的第一行合并后,获取是合并的列数,不是合并前实际列数)Row rowFirst = sheet.getRow(0);int cellNum = rowFirst.getPhysicalNumberOfCells();//        short firstCellNum = rowFirst.getFirstCellNum();
//        System.out.println(firstCellNum);
//        short lastCellNum = rowFirst.getLastCellNum();
//        System.out.println(lastCellNum);HeaderCell[][] headerCells = new HeaderCell[rowNum][cellNum];Iterator iter = sheet.rowIterator();for(int i = 0; iter.hasNext(); i++){HeaderCell headerCell = null;if(type == 1){HSSFRow row = (HSSFRow) iter.next();
//            获取每一行高度float heightInPoints = row.getHeightInPoints();
//            获取每一行有多少列 physical物理的int cellNums = row.getPhysicalNumberOfCells();for(int j = 0; j < cellNums; j++){headerCell = new HeaderCell();
//                获取到每一行下每一列HSSFCell cell = row.getCell((short) j);headStyle = cell.getCellStyle();headFont = wb.getFontAt(cell.getCellStyle().getFontIndex());//得到单元格的字体headerCell.setRowIndex(i);headerCell.setColIndex(j);headerCell.setText(hssfHelper.getCellStringValue(cell));headerCell.setHeight(heightInPoints);headerCell.setWidth(sheet.getColumnWidth((short) j) / 32);HSSFCellStyle cellStyle = cell.getCellStyle();HSSFColor fillForegroundColorColor1 = cellStyle.getFillForegroundColorColor();String foregroundColorHexString = fillForegroundColorColor1.getHexString();HSSFFont font = cellStyle.getFont(wb);HSSFWorkbook tempTransport = (HSSFWorkbook) wb;HSSFColor hssfColor = font.getHSSFColor(tempTransport);if(hssfColor == null){String colorHexString = "#000000";headerCell.setFontColor(colorHexString);}else{String colorHexString = hssfColor.getHexString();headerCell.setFontColor(colorHexString);}headerCell.setBgcolor(foregroundColorHexString);headerCell.setFontHeight(String.valueOf(headFont.getFontHeight()/20));boolean hasRegion = false;for(int k = 0; k < headerRegions.length; k++){
//                    判断当前cell是否属于合并单元格 i 在合并单元格之内 同时 j 在合并单元格内(上文headerRegions使用)if(i >= headerRegions[k].getTargetRowFrom() && i <= headerRegions[k].getTargetRowTo()&& j >= headerRegions[k].getTargetColumnFrom() && j <= headerRegions[k].getTargetColumnTo()){headerCell.setHeaderRegion(headerRegions[k]);hasRegion = true;}}if(!hasRegion){HeaderRegion headerRegion2 = new HeaderRegion();headerRegion2.setTargetRowFrom(i);headerRegion2.setTargetRowTo(i);headerRegion2.setTargetColumnFrom(j);headerRegion2.setTargetColumnTo(j);HSSFCell cell1 = (HSSFCell)sheet.getRow(i).getCell((short) j);headerRegion2.setText(hssfHelper.getCellStringValue(cell1));headerRegion2.setColLength(1);headerRegion2.setRowLength(1);headerCell.setHeaderRegion(headerRegion2);}
//                通过!hasRegion将没有合并的单元格都也有headerRegion,就是自己本身,本身的话下面设置两个变量都是true
//                合并区域的开始行i 和开始列 j 是否是当前单元格的开始行和列headerCell.setAscDisplay((i == headerCell.getHeaderRegion().getTargetRowFrom() && j == headerCell.getHeaderRegion().getTargetColumnFrom()) ? true : false);
//                合并区域的结束行i 和开始列 j 是否是当前单元格的开始行和列headerCell.setDescDisplay((i == headerCell.getHeaderRegion().getTargetRowTo() && j == headerCell.getHeaderRegion().getTargetColumnFrom()) ? true : false);headerCells[i][j] = headerCell;}}if(type == 2){XSSFRow row = (XSSFRow) iter.next();
//            获取每一行高度float heightInPoints = row.getHeightInPoints();
//            获取每一行有多少列 physical物理的int cellNums = row.getPhysicalNumberOfCells();for(int j = 0; j < cellNums; j++){headerCell = new HeaderCell();
//                获取到每一行下每一列XSSFCell cell = row.getCell(j);headFont = wb.getFontAt(cell.getCellStyle().getFontIndex());//得到单元格的字体headerCell.setRowIndex(i);headerCell.setColIndex(j);headerCell.setText(xssfHelper.getCellStringValue(cell));headerCell.setHeight(heightInPoints);headerCell.setWidth(sheet.getColumnWidth((short) j) / 32);XSSFCellStyle cellStyle = cell.getCellStyle();XSSFColor fillForegroundColorColor = cellStyle.getFillForegroundColorColor();if(fillForegroundColorColor == null){String foregroundColorHexString = "#ffffff";headerCell.setBgcolor(foregroundColorHexString);}else{byte[] argb = fillForegroundColorColor.getARGB();String tempString = bytesToHexString(argb);headerCell.setBgcolor(tempString);}XSSFFont font = cellStyle.getFont();XSSFColor xssfColor = font.getXSSFColor();if(xssfColor == null){String colorHexString = "#000000";headerCell.setFontColor(colorHexString);}else{byte[] argb = xssfColor.getARGB();String tempString = bytesToHexString(argb);headerCell.setFontColor(tempString);}headerCell.setFontHeight(String.valueOf(headFont.getFontHeight()/20));boolean hasRegion = false;for(int k = 0; k < headerRegions.length; k++){
//                    判断当前cell是否属于合并单元格 i 在合并单元格之内 同时 j 在合并单元格内(上文headerRegions使用)if(i >= headerRegions[k].getTargetRowFrom() && i <= headerRegions[k].getTargetRowTo()&& j >= headerRegions[k].getTargetColumnFrom() && j <= headerRegions[k].getTargetColumnTo()){headerCell.setHeaderRegion(headerRegions[k]);hasRegion = true;}}if(!hasRegion){HeaderRegion headerRegion2 = new HeaderRegion();headerRegion2.setTargetRowFrom(i);headerRegion2.setTargetRowTo(i);headerRegion2.setTargetColumnFrom(j);headerRegion2.setTargetColumnTo(j);XSSFCell cell1 = (XSSFCell)sheet.getRow(i).getCell((short) j);headerRegion2.setText(xssfHelper.getCellStringValue(cell1));headerRegion2.setColLength(1);headerRegion2.setRowLength(1);headerCell.setHeaderRegion(headerRegion2);}
//                通过!hasRegion将没有合并的单元格都也有headerRegion,就是自己本身,本身的话下面设置两个变量都是true
//                合并区域的开始行i 和开始列 j 是否是当前单元格的开始行和列headerCell.setAscDisplay((i == headerCell.getHeaderRegion().getTargetRowFrom() && j == headerCell.getHeaderRegion().getTargetColumnFrom()) ? true : false);
//                合并区域的结束行i 和开始列 j 是否是当前单元格的开始行和列headerCell.setDescDisplay((i == headerCell.getHeaderRegion().getTargetRowTo() && j == headerCell.getHeaderRegion().getTargetColumnFrom()) ? true : false);headerCells[i][j] = headerCell;}}}return headerCells;}/*** @description 拼接表头样式（报表表头导入）* @author * @param headerCells* @param flag* @return*/@SuppressWarnings("unchecked")public Map getHtmlStr(HeaderCell[][] headerCells, int flag) {if(headerCells == null || headerCells.length == 0) {return null;}Map map = new HashMap();int rowNum = headerCells.length;int cellNum = headerCells[0].length;String htmlStr = "";String cellStr = "";List cellList = new ArrayList();int width = 0;Map cellMap = null;int i = 0;boolean bool = i < rowNum;if(flag == -1){i = rowNum - 1;bool = i >= 0;}while(bool){for(int j = 0; j < cellNum; j++){
//                通过是否是正序(合并单元格开始行,限制列仅为开始)或者倒序,可以排除合并中不是开始的单元格(不必要的循环)boolean bool_tem = flag == -1 ? headerCells[i][j].isDescDisplay(): headerCells[i][j].isAscDisplay();if(bool_tem){String uuid = UUID.randomUUID().toString().replaceAll("-", "");cellMap = new HashMap();cellMap.put("title", headerCells[i][j].getText());                                  //标题cellMap.put("headid", uuid);                                                        //唯一idcellMap.put("rowfrom", headerCells[i][j].getHeaderRegion().getTargetRowFrom());     //起始行cellMap.put("colfrom", headerCells[i][j].getHeaderRegion().getTargetColumnFrom());  //起始列cellMap.put("rowto", headerCells[i][j].getHeaderRegion().getTargetRowTo());         //目标行cellMap.put("colto", headerCells[i][j].getHeaderRegion().getTargetColumnTo());      //目标列cellMap.put("colspan", headerCells[i][j].getHeaderRegion().getColLength());         //合并列cellMap.put("rowspan", headerCells[i][j].getHeaderRegion().getRowLength());         //合并行cellMap.put("width", headerCells[i][j].getWidth());         //宽度cellMap.put("height", headerCells[i][j].getHeight());         //高度cellMap.put("bg_color", headerCells[i][j].getBgcolor());         //背景色cellMap.put("font_color", headerCells[i][j].getFontColor());         //字体颜色cellMap.put("font_height", headerCells[i][j].getFontHeight());         //字体大小cellList.add(cellMap);/*//                    不是倒数第一和第二行循环
//                    添加随机id,方便后面建立父子级关系String uuid = UUID.randomUUID().toString().replaceAll("-", "");if((i != rowNum - 2) && (i != rowNum - 1)){cellMap = new HashMap();cellMap.put("title", headerCells[i][j].getText());                                  //标题cellMap.put("headid", uuid);                                                        //唯一idcellMap.put("rowfrom", headerCells[i][j].getHeaderRegion().getTargetRowFrom());     //起始行cellMap.put("colfrom", headerCells[i][j].getHeaderRegion().getTargetColumnFrom());  //起始列cellMap.put("rowto", headerCells[i][j].getHeaderRegion().getTargetRowTo());         //目标行cellMap.put("colto", headerCells[i][j].getHeaderRegion().getTargetColumnTo());      //目标列cellMap.put("colspan", headerCells[i][j].getHeaderRegion().getColLength());         //合并列cellMap.put("rowspan", headerCells[i][j].getHeaderRegion().getRowLength());         //合并行cellMap.put("width", headerCells[i][j].getWidth());         //宽度cellMap.put("height", headerCells[i][j].getHeight());         //高度cellMap.put("bg_color", headerCells[i][j].getBgcolor());         //背景色cellMap.put("font_color", headerCells[i][j].getFontColor());         //字体颜色cellMap.put("font_height", headerCells[i][j].getFontHeight());         //字体大小cellList.add(cellMap);}if(i == rowNum - 2) //标题对应英文字段(总行数rowNum不变,i变化,总函数减去2就是倒数第二行){htmlStr +=  "#" + headerCells[i][j].getHeaderRegion().getText() + ">>" + j;width += new Float(headerCells[i][j].getWidth()).intValue() + 20;}else if(i == rowNum - 1)  //英文字段类型{cellStr += "#" + headerCells[i][j].getHeaderRegion().getText() + ">>" + j;}*/}}if(flag == -1){i--;bool = i >= 0;}else{i++;bool = i < rowNum;}}
//        map.put("htmlStr", htmlStr.substring(1));
//        map.put("cellStr", cellStr.substring(1));map.put("cellList", cellList);map.put("rowNum", rowNum);
//        map.put("width", width);return map;}
}