mirror of https://gitee.com/xiaonuobase/snowy
113 lines
3.7 KiB
Java
113 lines
3.7 KiB
Java
/*
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* Copyright [2022] [https://www.xiaonuo.vip]
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*
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* Snowy采用APACHE LICENSE 2.0开源协议，您在使用过程中，需要注意以下几点：
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*
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* 1.请不要删除和修改根目录下的LICENSE文件。
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* 2.请不要删除和修改Snowy源码头部的版权声明。
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* 3.本项目代码可免费商业使用，商业使用请保留源码和相关描述文件的项目出处，作者声明等。
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* 4.分发源码时候，请注明软件出处 https://www.xiaonuo.vip
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* 5.不可二次分发开源参与同类竞品，如有想法可联系团队xiaonuobase@qq.com商议合作。
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* 6.若您的项目无法满足以上几点，需要更多功能代码，获取Snowy商业授权许可，请在官网购买授权，地址为 https://www.xiaonuo.vip
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*/
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package vip.xiaonuo.common.excel;
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import com.alibaba.excel.metadata.Head;
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import com.alibaba.excel.write.merge.AbstractMergeStrategy;
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import com.baomidou.mybatisplus.core.toolkit.CollectionUtils;
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import org.apache.poi.ss.usermodel.Cell;
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import org.apache.poi.ss.usermodel.Sheet;
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import org.apache.poi.ss.util.CellRangeAddress;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* EasyExcel自定义合并策略 该类继承了AbstractMergeStrategy抽象合并策略，需要重写merge()方法
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*
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* @author xuyuxiang
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* @date 2023/3/6 13:21
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**/
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public class CommonExcelCustomMergeStrategy extends AbstractMergeStrategy {
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/**
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* 分组，每几行合并一次
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*/
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private final List<Integer> exportFieldGroupCountList;
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/**
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* 目标合并列index
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*/
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private final Integer targetColumnIndex;
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/**
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* 需要开始合并单元格的首行index
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*/
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private Integer rowIndex;
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/**
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* exportDataList为待合并目标列的值
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*
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* @author xuyuxiang
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* @date 2023/3/6 13:23
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**/
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public CommonExcelCustomMergeStrategy(List<String> exportDataList, Integer targetColumnIndex) {
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this.exportFieldGroupCountList = getGroupCountList(exportDataList);
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this.targetColumnIndex = targetColumnIndex;
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}
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@Override
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protected void merge(Sheet sheet, Cell cell, Head head, Integer relativeRowIndex) {
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if (null == rowIndex) {
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rowIndex = cell.getRowIndex();
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}
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// 仅从首行以及目标列的单元格开始合并，忽略其他
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if (cell.getRowIndex() == rowIndex && cell.getColumnIndex() == targetColumnIndex) {
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mergeGroupColumn(sheet);
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}
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}
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private void mergeGroupColumn(Sheet sheet) {
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int rowCount = rowIndex;
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for (Integer count : exportFieldGroupCountList) {
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if(count == 1) {
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rowCount += count;
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continue ;
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}
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// 合并单元格
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CellRangeAddress cellRangeAddress = new CellRangeAddress(rowCount, rowCount + count - 1, targetColumnIndex, targetColumnIndex);
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sheet.addMergedRegionUnsafe(cellRangeAddress);
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rowCount += count;
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}
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}
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/*
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* 该方法将目标列根据值是否相同连续可合并，存储可合并的行数
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*
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* @author xuyuxiang
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* @date 2023/3/6 13:23
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**/
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private List<Integer> getGroupCountList(List<String> exportDataList){
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if (CollectionUtils.isEmpty(exportDataList)) {
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return new ArrayList<>();
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}
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List<Integer> groupCountList = new ArrayList<>();
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int count = 1;
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for (int i = 1; i < exportDataList.size(); i++) {
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if (exportDataList.get(i).equals(exportDataList.get(i - 1))) {
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count++;
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} else {
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groupCountList.add(count);
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count = 1;
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}
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}
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// 处理完最后一条后
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groupCountList.add(count);
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return groupCountList;
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}
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}
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