easyExcel 模版导出中间数据纵向延伸,并且对指定列进行合并

想要达到的效果

引入maven引用

        <dependency><groupId>com.alibaba</groupId><artifactId>easyexcel</artifactId><version>3.2.1</version></dependency>

按照要求创建模版

备注 :

模板注意用{} 来表示你要用的变量如果本来就有"{","}" 特殊字符用"\{","\}"代替
// {} 代表普通变量 {.} 代表是list的变量 {前缀.} 前缀可以区分不同的list

代码部分 :

合并策略代码 :

import com.alibaba.excel.metadata.Head;
import com.alibaba.excel.write.merge.AbstractMergeStrategy;
import io.jsonwebtoken.lang.Collections;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.util.CellRangeAddress;import java.util.ArrayList;
import java.util.List;// 自定义合并策略 该类继承了AbstractMergeStrategy抽象合并策略，需要重写merge()方法public class CustomMergeStrategy extends AbstractMergeStrategy {/*** 分组，每几行合并一次*/private List<Integer> exportFieldGroupCountList;/*** 目标合并列index*/private Integer targetColumnIndex;// 需要开始合并单元格的首行indexprivate Integer rowIndex;// exportDataList为待合并目标列的值 public CustomMergeStrategy(List<String> exportDataList, Integer targetColumnIndex) {this.exportFieldGroupCountList = getGroupCountList(exportDataList);this.targetColumnIndex = targetColumnIndex;}@Overrideprotected void merge(Sheet sheet, Cell cell, Head head, Integer relativeRowIndex) {if (null == rowIndex) {rowIndex = cell.getRowIndex();}// 仅从首行以及目标列的单元格开始合并，忽略其他if (cell.getRowIndex() == rowIndex && cell.getColumnIndex() == targetColumnIndex) {mergeGroupColumn(sheet);}}private void mergeGroupColumn(Sheet sheet) {int rowCount = rowIndex;for (Integer count : exportFieldGroupCountList) {if(count == 1) {rowCount += count;continue ;}// 合并单元格CellRangeAddress cellRangeAddress = new CellRangeAddress(rowCount, rowCount + count - 1, targetColumnIndex, targetColumnIndex);sheet.addMergedRegionUnsafe(cellRangeAddress);rowCount += count;}}// 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 private List<Integer> getGroupCountList(List<String> exportDataList){if (Collections.isEmpty(exportDataList)) {return new ArrayList<>();}List<Integer> groupCountList = new ArrayList<>();int count = 1;for (int i = 1; i < exportDataList.size(); i++) {if (exportDataList.get(i).equals(exportDataList.get(i - 1))) {count++;} else {groupCountList.add(count);count = 1;}}// 处理完最后一条后groupCountList.add(count);return groupCountList;}}

导出部分 :

@Testpublic void complexFillTest() throws IOException {//正式代码时 改成 input或者 file 传入String templateFileName = "D:/模版.xls";//改成导出的output或者其他方式写出 也可String fileName = "D:/下载的文件.xls";// 方案1try (ExcelWriter excelWriter = EasyExcel.write(fileName).withTemplate(templateFileName).excelType(ExcelTypeEnum.XLS).build()) {//数据准备 改成自己的即可InvoiceInfo invoiceInfo = invoiceInfoService.lambdaQuery().eq(InvoiceInfo::getId, 21).one();List<FreightOrderResponse> freightOrderResponseList = new ArrayList<>();ArrayList<Map<String, String>> dataList = new ArrayList<>();for (int i = 0; i < freightOrderResponseList.size(); i++) {FreightOrderResponse freightOrderResponse = freightOrderResponseList.get(0);Map<String, String> map = new HashMap<>();map.put("companyName",freightOrderResponse.getComName());if (freightOrderResponseList.size() / 2 < i){map.put("companyName",freightOrderResponse.getComName() + "1");}map.put("sendAddr",freightOrderResponse.getSendProvince());map.put("arriveAddr",freightOrderResponse.getReceiveProvince());map.put("goodsName",freightOrderResponse.getGoodsName());map.put("practicalFee",freightOrderResponse.getOrderPrice().toString());dataList.add(map);}WriteSheet writeSheet = EasyExcel.writerSheet()// 合并的单元格 并且将需要合并的那一列数据传入.registerWriteHandler(new CustomMergeStrategy(dataList.stream().map(map -> map.get("companyName")).collect(Collectors.toList()), 0)).build();// 这里注意 入参用了forceNewRow 代表在写入list的时候不管list下面有没有空行 都会创建一行，然后下面的数据往后移动。默认 是false，会直接使用下一行，如果没有则创建。// forceNewRow 如果设置了true,有个缺点 就是他会把所有的数据都放到内存了，所以慎用// 简单的说 如果你的模板有list,且list不是最后一行，下面还有数据需要填充 就必须设置 forceNewRow=true 但是这个就会把所有数据放到内存 会很耗内存// 如果数据量大 list不是最后一行 参照下一个FillConfig fillConfig = FillConfig.builder().forceNewRow(Boolean.TRUE).build();excelWriter.fill(dataList, fillConfig, writeSheet);Map<String, Object> map = MapUtils.newHashMap();BigDecimal reduce = freightOrderResponseList.stream().map(obj -> obj.getOrderPrice() != null ? obj.getOrderPrice() : BigDecimal.ZERO).reduce(BigDecimal.ZERO, BigDecimal::add);map.put("practicalFee", reduce);map.put("customName", invoiceInfo.getCustomName());map.put("sellerComName", invoiceInfo.getSellerComName());excelWriter.fill(map, writeSheet);excelWriter.finish();}}