初始化

xiangpei

2025-04-18 ccadf9480d4e6a9dcc227a2a0b1f9ae0612e36fd

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package com.monkeylessey.excel;
 
import com.alibaba.excel.metadata.Head;
import com.alibaba.excel.write.merge.AbstractMergeStrategy;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.util.CellRangeAddress;
 
import java.util.List;
 
/**
 * @author：xp
 * @date：2024/3/16 11:20
 */
public class DynamicMergeCellStrategy extends AbstractMergeStrategy {
 
    /**
     * 第几行到第几行合并一次
     */
    private List<RowItem> rowMergeList;
 
    /**
     * 哪些列需要合并行
     */
    private List<Integer> mergeWhichColumn;
 
    public DynamicMergeCellStrategy(List<RowItem> rowMergeList, List<Integer> mergeWhichColumn) {
        this.rowMergeList = rowMergeList;
        this.mergeWhichColumn = mergeWhichColumn;
    }
 
    @Override
    protected void merge(Sheet sheet, Cell cell, Head head, Integer relativeRowIndex) {
        // 只有单元格的行列在合并范围内才合并
        if (mergeWhichColumn.contains(cell.getColumnIndex())) {
            rowMergeList.stream().forEach(rowItem -> {
                if (rowItem.getStart() <= relativeRowIndex && rowItem.getEnd() >= relativeRowIndex) {
                    CellRangeAddress cellRangeAddress = new CellRangeAddress(rowItem.getStart(), rowItem.getEnd(), cell.getColumnIndex(), cell.getColumnIndex());
                    sheet.addMergedRegionUnsafe(cellRangeAddress);
                }
            });
        }
    }
}