
EasyExcel 合并单元格
关键代码
导出
@ApiOperation(value = "|数据提取需求 2-导出过程表")
@GetMapping("exportRequirement_2")
public void exportRequirement_2(HttpServletResponse response) throws Exception {
List<BatteryPackTempDTO> rlist = service.queryBatteryPackTempEO();
// 从第几行开始合并
int mergeStartRowIndex = 1;
// 需要合并哪些列
int[] mergeColumns = {0,1};
try {
StringBuilder sb = ExportUtil.getFileNameTimeStr("Requirement_2").append(".xlsx");
response.setHeader("Access-Control-Expose-Headers","Content-Disposition");
response.setHeader("Content-Disposition",
"attachment; filename=" + Encodes.urlEncode(sb.toString()));
response.setContentType("application/force-download");
OutputStream outputStream = response.getOutputStream();
// 写数据
EasyExcel.write(outputStream,
BatteryPackTempDTO.class).head( BatteryPackTempDTO.class)
.sheet("Sheet1")
.registerWriteHandler(new SimpleExcelMergeUtil(mergeStartRowIndex,mergeColumns))
.registerWriteHandler(ExportUtil.horizontalCellStyleStrategy())
.doWrite(rlist);
outputStream.flush();
outputStream.close();
}catch (Exception e){
logger.error(e.getMessage(), e);
}
}
合并单元格的实现类
package com.adc.da.extExcel.util;
import com.alibaba.excel.metadata.Head;
import com.alibaba.excel.metadata.data.CellData;
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.ArrayList;
import java.util.List;
/**
* 自定义合并单元格
*
* @author ld
* @date 2023-12-07
*/
public class SimpleExcelMergeUtil implements CellWriteHandler {
private int mergeStartRowIndex;
private int[] mergeColumns;
private List<Integer> mergeColumnList;
public SimpleExcelMergeUtil() {
}
public SimpleExcelMergeUtil(int mergeStartRowIndex, int[] mergeColumns) {
this.mergeStartRowIndex = mergeStartRowIndex;
this.mergeColumns = mergeColumns;
mergeColumnList = new ArrayList<>();
for (int i : mergeColumns) {
mergeColumnList.add(i);
}
}
/**
* 创建每个单元格之前执行
*
* @param writeSheetHolder
* @param writeTableHolder
* @param row
* @param head
* @param columnIndex
* @param relativeRowIndex
* @param isHead
*/
@Override
public void beforeCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Row row, Head head, Integer columnIndex, Integer relativeRowIndex, Boolean isHead) {
}
/**
* 创建每个单元格之后执行
*
* @param writeSheetHolder
* @param writeTableHolder
* @param cell
* @param head
* @param relativeRowIndex
* @param isHead
*/
@Override
public void afterCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
}
/**
* 每个单元格数据内容渲染之后执行
*
* @param writeSheetHolder
* @param writeTableHolder
* @param cellData
* @param cell
* @param head
* @param relativeRowIndex
* @param isHead
*/
public void afterCellDataConverted(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, CellData cellData, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
}
/**
* 每个单元格完全创建完之后执行
*
* @param writeSheetHolder
* @param writeTableHolder
* @param cellDataList
* @param cell
* @param head
* @param relativeRowIndex
* @param isHead
*/
public void afterCellDispose(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, List<WriteCellData<?>> cellDataList, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
// 当前行
int curRowIndex = cell.getRowIndex();
// 当前列
int curColIndex = cell.getColumnIndex();
if (!isHead) {
if (curRowIndex > mergeStartRowIndex && mergeColumnList.contains(curColIndex)) {
// 从第二行数据行开始,获取当前行第二列数据
Object curData = cell.getCellTypeEnum() == CellType.STRING ? cell.getStringCellValue() : cell.getNumericCellValue();
// 获取上一行第二列数据
Cell preCell = cell.getSheet().getRow(curRowIndex - 1).getCell(curColIndex);
Object preData = preCell.getCellTypeEnum() == CellType.STRING ? preCell.getStringCellValue() : preCell.getNumericCellValue();
if (curData.equals(preData)) {
Sheet sheet = writeSheetHolder.getSheet();
List<CellRangeAddress> mergedRegions = sheet.getMergedRegions();
boolean isMerged = false;
for (int i = 0; i < mergedRegions.size() && !isMerged; i++) {
CellRangeAddress cellRangeAddr = mergedRegions.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);
}
}
}
}
}
}
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