EasyExcel realizes the merging of cells with the same content in specified rows and columns

ExcelMergeUtil tool class

package com.sdy.resdir.biz.util;
 
 
import com.alibaba.excel.metadata.CellData;
import com.alibaba.excel.metadata.Head;
import com.alibaba.excel.write.handler.CellWriteHandler;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.metadata.holder.WriteTableHolder;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.util.CellRangeAddress;
 
import java.math.BigDecimal;
import java.util.List;
 
import static org.apache.poi.ss.usermodel.CellType.NUMERIC;
 
public class ExcelMergeUtil implements CellWriteHandler {
    
    
    private int[] mergeColumnIndex;
    private int mergeRowIndex;
 
    public ExcelMergeUtil() {
    
    
    }
 
    public ExcelMergeUtil(int mergeRowIndex, int[] mergeColumnIndex) {
    
    
        this.mergeRowIndex = mergeRowIndex;
        this.mergeColumnIndex = mergeColumnIndex;
    }
 
    @Override
    public void beforeCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Row row, Head head, Integer columnIndex, Integer relativeRowIndex, Boolean isHead) {
    
    
 
    }
 
    @Override
    public void afterCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
    
    
 
    }
 
    @Override
    public void afterCellDataConverted(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, CellData cellData, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
    
    
 
    }
 
    @Override
    public void afterCellDispose(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, List<CellData> cellDataList, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
    
    
 
        //当前行
        int curRowIndex = cell.getRowIndex();
        //当前列
        int curColIndex = cell.getColumnIndex();
 
        if (curRowIndex > mergeRowIndex) {
    
    
            for (int i = 0; i < mergeColumnIndex.length; i++) {
    
    
                if (curColIndex == mergeColumnIndex[i]) {
    
    
                    mergeWithPrevRow(writeSheetHolder, cell, curRowIndex, curColIndex);
                    break;
                }
            }
        }
    }
 
 
    /**
     * 当前单元格向上合并
     *
     * @param writeSheetHolder
     * @param cell             当前单元格
     * @param curRowIndex      当前行
     * @param curColIndex      当前列
     */
    private void mergeWithPrevRow(WriteSheetHolder writeSheetHolder, Cell cell, int curRowIndex, int curColIndex) {
    
    
        Object curData = cell.getCellTypeEnum() == CellType.STRING ? cell.getStringCellValue() : cell.getNumericCellValue();
        Cell preCell = cell.getSheet().getRow(curRowIndex - 1).getCell(curColIndex);
        Object preData = preCell.getCellTypeEnum() == CellType.STRING ? preCell.getStringCellValue() : preCell.getNumericCellValue();
        // 将当前单元格数据与上一个单元格数据比较
        Boolean dataBool = preData.equals(curData);
        if (dataBool) {
    
    
            Sheet sheet = writeSheetHolder.getSheet();
            List<CellRangeAddress> mergeRegions = sheet.getMergedRegions();
            boolean isMerged = false;
            for (int i = 0; i < mergeRegions.size() && !isMerged; i++) {
    
    
                CellRangeAddress cellRangeAddr = mergeRegions.get(i);
                // 若上一个单元格已经被合并，则先移出原有的合并单元，再重新添加合并单元
                if (cellRangeAddr.isInRange(curRowIndex - 1, curColIndex)) {
    
    
                    sheet.removeMergedRegion(i);
                    cellRangeAddr.setLastRow(curRowIndex);
                    sheet.addMergedRegion(cellRangeAddr);
                    isMerged = true;
                }
            }
            // 若上一个单元格未被合并，则新增合并单元
            if (!isMerged) {
    
    
                CellRangeAddress cellRangeAddress = new CellRangeAddress(curRowIndex - 1, curRowIndex, curColIndex, curColIndex);
                sheet.addMergedRegion(cellRangeAddress);
            }
        }
    }
}
 

Control layer call

public void downLoadResItem(HttpServletResponse response, String resName, Integer isOnline, Integer resType, Integer resLevel, Integer resPower, Integer resPowerDept, Integer realmId) throws IOException {
    
    
        if (StringUtil.isNotBlank(resName)) {
    
    
            resName = URLDecoder.decode(resName, "UTF-8");
        }
        List<RdResourceDirExcelDTO> rdResourceDirList = rdResourceDirService.getList(resName, isOnline, resType, resLevel, resPower, resPowerDept, realmId);
        response.setContentType("application/vnd.ms-excel");
        response.setCharacterEncoding("utf-8");
        String fileName = URLEncoder.encode("资源列表下载", "UTF-8");
        response.setHeader("Content-disposition", "attachment;filename=" + fileName + ".xls");
        ServletOutputStream output = response.getOutputStream();
        ExcelWriter writer = new ExcelWriter(output, ExcelTypeEnum.XLS, true);
        Sheet sheet = new Sheet(1, 0, ResItemExcelVo.class);
        // sheet.setSheetName("第一页");
        List<ResItemExcelVo> voList = setResItemData(rdResourceDirList);
        // writer.write(voList, sheet);
        //需要合并的列
        int[] mergeColumeIndex = {
    
    0,1,2,3,4,5,6,7,8,9};
        // 从第二行后开始合并
        int mergeRowIndex = 2;
        EasyExcel.write(response.getOutputStream(), ResItemExcelVo.class)
                .sheet("第一页")
                // .registerWriteHandler(new ExcelFillCellMergeStrategy(mergeRowIndex, mergeColumeIndex))
                .registerWriteHandler(new ExcelMergeUtil(mergeRowIndex, mergeColumeIndex))
                .doWrite(voList);
        writer.finish();
        output.flush();
    }

The effect is similar to the picture below