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一对多数据合并策略

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Signed-off-by: 描述不符 <826801306@qq.com>
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描述不符 2025-11-25 07:01:37 +00:00 committed by Gitee
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ruoyi-common/ruoyi-common-excel/src/main/java/org/dromara/common/excel/handler/OneToManyMergeStrategy.java Normal file
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package org.dromara.common.excel.handler;
import cn.hutool.core.util.ObjectUtil;
import cn.idev.excel.metadata.Head;
import cn.idev.excel.metadata.data.WriteCellData;
import cn.idev.excel.write.handler.CellWriteHandler;
import cn.idev.excel.write.handler.context.CellWriteHandlerContext;
import cn.idev.excel.write.metadata.holder.WriteSheetHolder;
import cn.idev.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;
/**
* 一对多数据合并策略
* @author 描述不符
*/
public class OneToManyMergeStrategy implements CellWriteHandler {
/**
* 判断是否合并的字段
*/
private String mergeFieldName;
/**
* 待合并列index
*/
private List<Integer> mergeColumnIndexList;
public OneToManyMergeStrategy(String mergeFieldName, List<Integer> mergeColumnIndexList) {
this.mergeFieldName = mergeFieldName;
this.mergeColumnIndexList = mergeColumnIndexList;
}
@Override
public void beforeCellCreate(CellWriteHandlerContext context) {
CellWriteHandler.super.beforeCellCreate(context);
}
@Override
public void beforeCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Row row, Head head, Integer columnIndex, Integer relativeRowIndex, Boolean isHead) {
CellWriteHandler.super.beforeCellCreate(writeSheetHolder, writeTableHolder, row, head, columnIndex, relativeRowIndex, isHead);
}
@Override
public void afterCellCreate(CellWriteHandlerContext context) {
CellWriteHandler.super.afterCellCreate(context);
}
@Override
public void afterCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
CellWriteHandler.super.afterCellCreate(writeSheetHolder, writeTableHolder, cell, head, relativeRowIndex, isHead);
}
@Override
public void afterCellDataConverted(CellWriteHandlerContext context) {
CellWriteHandler.super.afterCellDataConverted(context);
}
@Override
public void afterCellDataConverted(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, WriteCellData<?> cellData, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
CellWriteHandler.super.afterCellDataConverted(writeSheetHolder, writeTableHolder, cellData, cell, head, relativeRowIndex, isHead);
}
@Override
public void afterCellDispose(CellWriteHandlerContext context) {
CellWriteHandler.super.afterCellDispose(context);
}
@Override
public void afterCellDispose(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, List<WriteCellData<?>> cellDataList, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
if(isHead) return;
if(ObjectUtil.isNull(relativeRowIndex) || relativeRowIndex == 0) return;
if(!this.mergeFieldName.equals(head.getFieldName())) return;
Sheet sheet = cell.getSheet();
int rowIndexCurrent = cell.getRowIndex();
int rowIndexPrev = rowIndexCurrent - 1;
Row rowPrev = sheet.getRow(rowIndexPrev);
Cell cellPrev = rowPrev.getCell(cell.getColumnIndex());
Object cellValueCurrent = cell.getCellType() == CellType.STRING? cell.getStringCellValue() : cell.getNumericCellValue();
Object cellValuePrev = cellPrev.getCellType() == CellType.STRING? cellPrev.getStringCellValue() : cellPrev.getNumericCellValue();
if(!cellValueCurrent.equals(cellValuePrev)) return;
List<CellRangeAddress> mergedRegions = sheet.getMergedRegions();
boolean isMerged = false;
for (int i = 0; i < mergedRegions.size(); i++) {
CellRangeAddress cellRangeAddress = mergedRegions.get(i);
for (int k = 0; k < mergeColumnIndexList.size(); k++) {
if(cellRangeAddress.isInRange(rowIndexPrev, mergeColumnIndexList.get(k))){
sheet.removeMergedRegion(i);
cellRangeAddress.setLastRow(rowIndexCurrent);
sheet.addMergedRegion(cellRangeAddress);
isMerged = true;
}
}
// for(int j = this.columnIndexStart; j <= columnIndexEnd; j++){
// if(cellRangeAddress.isInRange(rowIndexPrev, j)){
// sheet.removeMergedRegion(i);
// cellRangeAddress.setLastRow(rowIndexCurrent);
// sheet.addMergedRegion(cellRangeAddress);
// isMerged = true;
// }
//
// }
}
if(!isMerged) {
for (int k = 0; k < mergeColumnIndexList.size(); k++) {
CellRangeAddress cellRangeAddress = new CellRangeAddress(rowIndexPrev, rowIndexCurrent, mergeColumnIndexList.get(k), mergeColumnIndexList.get(k));
sheet.addMergedRegion(cellRangeAddress);
}
}
}
}