Cell curGroupCell = cell.getSheet().getRow(curRowIndex).getCell(groupColumnIndex);
Cell preGroupCell = cell.getSheet().getRow(curRowIndex - 1).getCell(groupColumnIndex);
假设说groupColumnIndex 4 , 那么为什么 0 1 2 3 会导致无法合并单元格 5、6、7 在groupColumnIndex 可以合并单元格,这是EasyExccel的什么原因导致的,怎么解决?????
猜测原因问题原因:
EasyExcel 是按列顺序处理单元格的。
当处理到 groupColumnIndex (4) 之前的列 (0, 1, 2, 3) 时,groupColumnIndex 的值还没有被写入。
我们的检查逻辑试图访问还不存在的 groupColumnIndex 列的值,导致无法正确判断是否应该合并。
而处理 5、6、7 列时,groupColumnIndex 列已经有值了,所以可以正常合并。
// 分组依据的列索引 只有在第一列,int groupColumnIndex = 0; 才能保证后续每列分组后单元格合并正常,但有时候分组列需求就是要放在其它位置,请问如何解决
// 追加写
ServletOutputStream outputStream = response.getOutputStream();
response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
response.setCharacterEncoding("utf-8");
// 这里URLEncoder.encode可以防止中文乱码 当然和easyexcel没有关系
String fileName = URLEncoder.encode("企业诉求跟踪办理通知单情况表", "UTF-8").replaceAll("\\+", "%20");
response.setHeader("Content-disposition", "attachment;filename*=utf-8''" + fileName + ".xlsx");
InputStream resourceAsStream = ResourceLoader.class.getResourceAsStream("/excel/data_report3_del.xlsx");
try (ExcelWriter excelWriter = EasyExcel.write(outputStream).withTemplate(resourceAsStream).build()) {
// 需要合并的列
int[] mergeColumnIndex = {0, 2,4, 5, 6, 7};
// 需要从第几行开始合并
int mergeRowIndex = 3;
// 分组依据的列索引
int groupColumnIndex = 0;
WriteSheet writeSheet = EasyExcel.writerSheet().registerWriteHandler(new ExcelMergeHandler2(mergeRowIndex, mergeColumnIndex, groupColumnIndex))
.build();
// Map<String, Object> map = new HashMap<>();
FillConfig fillConfig = FillConfig.builder().forceNewRow(Boolean.TRUE).build();// 填充配置。
excelWriter.fill(new FillWrapper("data", rsList), fillConfig, writeSheet);
} catch (Exception e) {
IoUtil.close(outputStream);
throw new RuntimeException(e.getMessage());
} finally {
IoUtil.close(outputStream);
}
package com.ruoyi.biz.utils.excel;
import com.alibaba.excel.metadata.Head;
import com.alibaba.excel.metadata.data.WriteCellData;
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.util.List;
/**
* @Author: lxy
* @CreateTime: 2024-06-12
* @Description: EasyExcel单元格合并处理器
*/
public class ExcelMergeHandler2 implements CellWriteHandler {
private int[] mergeColumnIndex;
private int mergeRowIndex;
private int groupColumnIndex;
/**
* 构造函数
*
* @param mergeRowIndex 合并开始的行索引
* @param mergeColumnIndex 要合并的列索引数组
* @param groupColumnIndex 分组列索引数组
*/
public ExcelMergeHandler2(int mergeRowIndex, int[] mergeColumnIndex, int groupColumnIndex) {
this.mergeRowIndex = mergeRowIndex;
this.mergeColumnIndex = mergeColumnIndex;
this.groupColumnIndex = groupColumnIndex;
}
@Override
public void afterCellDispose(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, List<WriteCellData<?>> cellDataList, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
// 当前行索引
int curRowIndex = cell.getRowIndex();
// 当前列索引
int curColIndex = cell.getColumnIndex();
// 如果当前行大于合并开始行
if (curRowIndex > mergeRowIndex) {
// 当前列在需要合并的列中
for (int columnIndex : mergeColumnIndex) {
if (curColIndex == columnIndex) {
// 进行合并操作
mergeWithPrevRow(writeSheetHolder, cell, curRowIndex, curColIndex);
break;
}
}
}
}
/**
* 当前单元格向上合并
*
* @param writeSheetHolder 当前工作表持有者
* @param cell 当前单元格
* @param curRowIndex 当前行索引
* @param curColIndex 当前列索引
*/
private void mergeWithPrevRow(WriteSheetHolder writeSheetHolder, Cell cell, int curRowIndex, int curColIndex) {
// 获取当前行的当前列的数据和上一行的当前列列数据,通过上一行数据是否相同进行合并
Object curData = cell.getCellTypeEnum() == CellType.STRING ? cell.getStringCellValue() : cell.getNumericCellValue();
// 获取前一个单元格的数据
Cell preCell = cell.getSheet().getRow(curRowIndex - 1).getCell(curColIndex);
Object preData = preCell.getCellTypeEnum() == CellType.STRING ? preCell.getStringCellValue() : preCell.getNumericCellValue();
// 判断当前单元格和前一个单元格的数据是否相同
if (curData.equals(preData)) {
// 检查分组列的数据是否相同
boolean isSameGroup = false;
// 为什么curGroupCell 会是空指针
// 如果你使用了 @ExcelProperty 注解来映射 Java 对象到 Excel 列,
//可以通过调整注解中的 index 参数来确保 groupColumnIndex 列优先填充。
Cell curGroupCell = cell.getSheet().getRow(curRowIndex).getCell(groupColumnIndex);
Cell preGroupCell = cell.getSheet().getRow(curRowIndex - 1).getCell(groupColumnIndex);
if (curGroupCell != null && preGroupCell != null) {
Object curGroupData = curGroupCell.getCellTypeEnum() == CellType.STRING ? curGroupCell.getStringCellValue() : curGroupCell.getNumericCellValue();
Object preGroupData = preGroupCell.getCellTypeEnum() == CellType.STRING ? preGroupCell.getStringCellValue() : preGroupCell.getNumericCellValue();
if (curGroupData.equals(preGroupData)) {
isSameGroup = true;
}
}
if (isSameGroup) {
// 获取工作表
Sheet sheet = writeSheetHolder.getSheet();
// 获取已合并的区域
List<CellRangeAddress> mergeRegions = sheet.getMergedRegions();
boolean isMerged = false;
// 检查前一个单元格是否已经被合并
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;
}
}
// 如果前一个单元格未被合并,则新增合并区域
if (!isMerged) {
CellRangeAddress cellRangeAddress = new CellRangeAddress(curRowIndex - 1, curRowIndex, curColIndex, curColIndex);
sheet.addMergedRegion(cellRangeAddress);
}
}
}
}
@Override
public void beforeCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Row row, Head head, Integer integer, Integer integer1, Boolean aBoolean) {
}
@Override
public void afterCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Cell cell, Head head, Integer integer, Boolean aBoolean) {
}
}
1条答案
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