基于EasyExcel模板填充方式进行二次导出（动态表头合并单元格问题处理）

🎈 1 参考文档

填充Excel | Easy Excel官方文档
EasyExcel-合并单元格 | 博客园-默念x

🔍2 个人需求

2.1 数据需求

第一部分粉色部分：表头固定，直接使用模板；红色部分：正常数据内容，和一般的Excel导出大同小异；第二部分绿色部分：上面的表头是动态的，并且这些字段没有落表；橙色部分：左边的实测值、总权重得分、总得分相当于固定的表头；黄色部分：这部分是正常数据，但是橙色部分也需要被当作成数据。

2.2 单元格合并需求

紫色部分：表头部分，类别相同的进行横向和纵向合并；绿色部分：根据相同类别，将表格数据进行横向合并；橙色部分：相同两行实测值包括实测值所属的数据进行纵向合并；红色部分：因为橙色部分加上绿色部分对应“实测值、实测值、总权重得分、总得分”一共四行，所以红色部分是相同的四行产品数据，需要进行纵向合并。

合并后的样子：

💡 3 解决方案

3.1 数据处理

使用EasyExcel利用模板填充的方式，以一个单元格为最小单位，把数据全部查出来，然后将数据处理成一行一行的形式进行填充，碰到相同的数据，就进行合并单元格。

3.2 数据字段没落表

有一部分表头数据的字段没有落表，在实际数据库中都属于一个字段，例如下图：光学、电学、声学实际上都属于category，而不是optics、electricity、acoustics。

可以使用map的进行对数据进行处理和存储，处理后的样子：

3.3 动态表头

一般都是固定表头，然后填充数据，相当于一维的。因为表头是动态的，所以第二部分数据相当于二维的，需要将表头和表格数据分别进行填充。

EasyExcel的填充方式是通过模板进行填充导出的，那我们可以导出两次，第一次用/resources/template下的模板文件将Excel导出成流，接着以第一次导出的Excel流，作为第二次导出的模板，最后再导出需要的Excel表格。

模板：

第一次导出：

第二次导出：

以这种方法，不仅仅是导出两次，还可以导出多次，以此处理更加复杂的表格。

3.4 合并单元格

参考官方的文章合并单元格和文章EasyExcel-合并单元格-默念x，然后根据需要自定义合并策略Strategy并且继承于AbstractMergeStrategy，计算出需要合并单元格数量的列表，然后利用CellRangeAddress进行单元格合并。

CellRangeAddress cellRangeAddress = new CellRangeAddress(起始行，结尾行，起始列，结尾列)；sheet.addMergedRegionUnsafe(cellRangeAddress);

使用合并策略的方式：

ExcelWriter screenTemplateExcelWriter = EasyExcel.write(templateOut) // 导出最终临时文件.withTemplate(templateFileName)// 使用的模板.registerWriteHandler(new XXXStrategy(需要的参数))// 自定义单元格合并策略.build();

🚀4 第一次导出（部分代码）

4.1 Excel 填充模板

总体样貌，模板名称为screenTemplate.xlsx，工作表名称为sheet0。

拉长单元格，查看具体变量。

4.2 ScreenServiceImpl 业务实现层

@Servicepublic class ScreenServiceImpl implements ScreenService {@Overridepublic void export(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) {// HttpServletResponse消息头参数设置String filename = "exportFile.xlsx";httpServletResponse.addHeader(HttpHeaders.CONTENT_DISPOSITION, "attachment;filename=" + filename);httpServletResponse.setContentType("application/octet-stream;charset=UTF-8");httpServletResponse.addHeader("Pragma", "no-cache");httpServletResponse.addHeader("Cache-Control", "no-cache");// 通过ClassPathResource获取/resources/template下的模板文件ClassPathResource classPathResource = new ClassPathResource("template/screenTemplate.xlsx");// 这里用try-with-resourcetry (// 获取模板文件InputStream screenParamTemplateFileName = classPathResource.getInputStream();OutputStream screenOut = httpServletResponse.getOutputStream();BufferedOutputStream screenBos = new BufferedOutputStream(screenOut);) {// --------------------------------基本配置--------------------------------// 设置内容的策略WriteCellStyle contentWriteCellStyle = new WriteCellStyle();// 设置内容水平居中对齐contentWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);// 设置内容垂直居中对齐contentWriteCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);// 自动换行contentWriteCellStyle.setWrapped(true);// 设置字体样式和大小WriteFont contentWriteFont = new WriteFont();contentWriteFont.setFontHeightInPoints((short) 12);contentWriteFont.setFontName("微软雅黑");contentWriteCellStyle.setWriteFont(contentWriteFont);// 配置横向填充FillConfig fillConfig = FillConfig.builder().direction(WriteDirectionEnum.HORIZONTAL).build();// sheet名称WriteSheet writeSheet = EasyExcel.writerSheet("sheet0").build();// --------------------------------基本配置--------------------------------// ---------------------模拟获取第一部分的表格数据、表头参数---------------------List<ScreenGatherDTO> screenGatherDTOList = new ArrayList<>();// 构造5个产品数据for (int i = 1; i <= 5; i++) {// 每份数据乘以4，为了合并单元格做准备for (int j = 0; j < 4; j++) {ScreenGatherDTO screenGatherDTO = new ScreenGatherDTO();screenGatherDTO.setScreenSize(String.valueOf(i * 10));screenGatherDTO.setSupplier("厂商" + i);screenGatherDTO.setPartMode("型号" + i);screenGatherDTO.setResolution("1080P");screenGatherDTO.setRefreshRate("60Hz");screenGatherDTO.setPanel("IPS");screenGatherDTOList.add(screenGatherDTO);}}if (CollectionUtils.isNotEmpty(screenGatherDTOList)) {for (int i = 0; i < screenGatherDTOList.size(); i++) {// 在屏规格末尾加上表格模板参数screenGatherDTOList.get(i).setValueTemplateParam("{screenValueTemplateParam" + i + ".value}");}}// 填充第一个表头的单元格ScreenValueExcelDTO screenValueExcelDTO = new ScreenValueExcelDTO();List<ScreenValueExcelDTO> screenValueExcelDTOList = new ArrayList<>();screenValueExcelDTO.setValue("产品测试");screenValueExcelDTOList.add(screenValueExcelDTO);// 在屏规格末尾加上表头模板参数List<ScreenValueExcelDTO> screenTableExcelDTOList = new ArrayList<>();for (int i = 0; i < 4; i++) {ScreenValueExcelDTO screenTableExcelDTO = new ScreenValueExcelDTO();switch (i) {case 0:screenTableExcelDTO.setValue("{screenTableExcelDTOList.modelName}");break;case 1:screenTableExcelDTO.setValue("{screenTableExcelDTOList.testItemCategory}");break;case 2:screenTableExcelDTO.setValue("{screenTableExcelDTOList.testItemName}");break;case 3:screenTableExcelDTO.setValue("{screenTableExcelDTOList.subTestItemName}");break;default:break;}screenTableExcelDTOList.add(screenTableExcelDTO);}// ---------------------模拟获取第一部分的表格数据、表头参数---------------------// --------------------------------第一次导出--------------------------------ExcelWriter screenTemplateExcelWriter = EasyExcel.write(screenBos) // 导出临时文件，使用的是BufferedOutputStream.withTemplate(screenParamTemplateFileName) // 使用的模板.registerWriteHandler(new ScreenValueMergeStrategy(screenGatherDTOList, 1, 6, 5)) // 自定义单元格合并策略.registerWriteHandler(new HorizontalCellStyleStrategy(null, contentWriteCellStyle)) // 只配置内容策略，头部为null.build();// 填充屏规格表格数据screenTemplateExcelWriter.fill(new FillWrapper("screenGatherDTOList", screenGatherDTOList), writeSheet);// 填充第一个表头的单元格screenTemplateExcelWriter.fill(new FillWrapper("screenValueExcelDTOList", screenValueExcelDTOList), writeSheet);// 填充表头模板参数screenTemplateExcelWriter.fill(new FillWrapper("screenTableExcelDTOList", screenTableExcelDTOList), writeSheet);screenTemplateExcelWriter.finish();// --------------------------------第一次导出--------------------------------} catch (IOException e) {throw new RuntimeException(e);}}}

4.3 ScreenValueMergeStrategy 自定义合并单元格策略

public class ScreenValueMergeStrategy extends AbstractMergeStrategy {/*** 分组，每几行合并一次*/private List<Integer> exportFieldGroupCountList;/*** 合并的目标开始列索引*/private Integer targetBeginColIndex;/*** 合并的目标结束列索引*/private Integer targetEndColIndex;/*** 需要开始合并单元格的首行索引*/private Integer firstRowIndex;public ScreenValueMergeStrategy() {}/*** @param exportDataList待合并目标行的值* @param targetBeginColIndex 合并的目标开始列索引* @param targetEndColIndex 合并的目标结束列索引* @param firstRowIndex 需要开始合并单元格的首行索引*/public ScreenValueMergeStrategy(List<ScreenGatherDTO> exportDataList, Integer targetBeginColIndex, Integer targetEndColIndex, Integer firstRowIndex) {this.exportFieldGroupCountList = getGroupCountList(exportDataList);this.targetBeginColIndex = targetBeginColIndex;this.targetEndColIndex = targetEndColIndex;this.firstRowIndex = firstRowIndex;}@Overrideprotected void merge(Sheet sheet, Cell cell, Head head, Integer relativeRowIndex) {if (cell.getRowIndex() == this.firstRowIndex && cell.getColumnIndex() >= targetBeginColIndex - 1 && cell.getColumnIndex() <= targetEndColIndex - 1) {int rowCount = this.firstRowIndex;for (Integer count : exportFieldGroupCountList) {if (count == 1) {rowCount += count;continue;}// 合并单元格CellRangeAddress cellRangeAddress;for (int i = 0; i < targetEndColIndex - targetBeginColIndex + 1; i++) {cellRangeAddress = new CellRangeAddress(rowCount - 1, rowCount + count - 2, i, i);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** @param exportDataList* @return*/private List<Integer> getGroupCountList(List<ScreenGatherDTO> exportDataList) {if (CollectionUtils.isEmpty(exportDataList)) {return new ArrayList<>();}List<Integer> groupCountList = new ArrayList<>();int count = 1;for (int i = 1; i < exportDataList.size(); i++) {boolean equals = exportDataList.get(i).getPartMode().equals(exportDataList.get(i - 1).getPartMode());if (equals) {count++;} else {groupCountList.add(count);count = 1;}}// 处理完最后一条后groupCountList.add(count);return groupCountList;}}

4.4 拉长单元格并查看导出效果

未合并的效果。

合并后的效果。

5 第二次导出(完整代码)：以第一次导出的excel流，作为第二次导出的模板

5.1 配置文件

5.1.1 pom.xml 依赖

主要用到EasyExcel、Hutool、Lombok。

<dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>com.alibaba</groupId><artifactId>easyexcel</artifactId><version>3.0.5</version></dependency><dependency><groupId>cn.hutool</groupId><artifactId>hutool-all</artifactId><version>5.8.8</version></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></dependency></dependencies>

5.1.2 Excel 模板文件

Excel模板文件路径在：/resources/template/screenTemplate.xlsx，文件内容同4.1。

5.2 controller

5.2.1 ScreenController

import com.example.demo.service.ScreenService;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.GetMapping;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.IOException;/*** @author Cauli* @date /12/1 9:40* @description 控制层*/@RestController@RequestMapping("/screen")public class ScreenController {@Autowiredprivate ScreenService screenService;@GetMapping(value = "/export")public void export(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) {screenService.export(httpServletRequest, httpServletResponse);}}

⭐5.3 service

5.3.1 ScreenServiceImpl

import com.alibaba.excel.EasyExcel;import com.alibaba.excel.ExcelWriter;import com.alibaba.excel.enums.WriteDirectionEnum;import com.alibaba.excel.write.metadata.WriteSheet;import com.alibaba.excel.write.metadata.fill.FillConfig;import com.alibaba.excel.write.metadata.fill.FillWrapper;import com.alibaba.excel.write.metadata.style.WriteCellStyle;import com.alibaba.excel.write.metadata.style.WriteFont;import com.alibaba.excel.write.style.HorizontalCellStyleStrategy;import com.example.demo.dto.ScreenExcelDTO;import com.example.demo.dto.ScreenGatherDTO;import com.example.demo.dto.ScreenValueExcelDTO;import com.example.demo.service.ScreenService;import com.example.demo.strategy.ScreenScoreHeaderMergeStrategy;import com.example.demo.strategy.ScreenScoreValueHorizontalMergeStrategy;import com.example.demo.strategy.ScreenScoreValueMergeStrategy;import com.example.demo.strategy.ScreenValueMergeStrategy;import mons.collections4.CollectionUtils;import mons.collections4.MapUtils;import org.apache.poi.ss.usermodel.HorizontalAlignment;import org.apache.poi.ss.usermodel.VerticalAlignment;import org.springframework.core.io.ClassPathResource;import org.springframework.http.HttpHeaders;import org.springframework.stereotype.Service;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.BufferedOutputStream;import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.util.ArrayList;import java.util.LinkedHashMap;import java.util.List;import java.util.Map;/*** @author Cauli|* @date: /12/1 9:47* @description: 业务实现层*/@Servicepublic class ScreenServiceImpl implements ScreenService {@Overridepublic void export(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) {// HttpServletResponse消息头参数设置this.setHttpServletResponse(httpServletResponse);// 通过ClassPathResource获取/resources/template下的模板文件ClassPathResource classPathResource = new ClassPathResource("template/screenTemplate.xlsx");// 需要导出的临时模板文件InputStream screenTemporaryTemplate = null;// 这里用try-with-resourcetry (// 获取模板文件InputStream screenParamTemplateFileName = classPathResource.getInputStream();OutputStream screenOut = httpServletResponse.getOutputStream();BufferedOutputStream screenBos = new BufferedOutputStream(screenOut);ByteArrayOutputStream screenTemplateOut = new ByteArrayOutputStream();) {// --------------------------------基本配置--------------------------------// 设置内容的策略WriteCellStyle contentWriteCellStyle = this.getWriteCellStyle();// 配置横向填充FillConfig fillConfig = FillConfig.builder().direction(WriteDirectionEnum.HORIZONTAL).build();// sheet名称，注意要和Excel模板中的工作表名称相同，不然无法导出数据WriteSheet writeSheet = EasyExcel.writerSheet("sheet0").build();// --------------------------------基本配置--------------------------------// ---------------------模拟获取第一部分的表格数据、表头参数---------------------// 构造第一部分产品数据List<ScreenGatherDTO> screenGatherDTOList = this.getScreenGatherDTOList();// 填充第一个表头的单元格List<ScreenValueExcelDTO> screenValueExcelDTOList = this.getScreenValueExcelDTOList();// 在屏规格末尾加上表头模板参数List<ScreenValueExcelDTO> screenTableExcelDTOList = this.getScreenTableExcelDTOList();// ---------------------模拟获取第一部分的表格数据、表头参数---------------------// --------------------------------第一次导出--------------------------------ExcelWriter screenTemplateExcelWriter = EasyExcel.write(screenBos) // 导出临时文件，使用的是BufferedOutputStream//.write(screenTemplateOut) // 导出最终临时文件，使用的是ByteArrayOutputStream.withTemplate(screenParamTemplateFileName) // 使用的模板.registerWriteHandler(new ScreenValueMergeStrategy(screenGatherDTOList, 1, 6, 5)) // 自定义单元格合并策略.registerWriteHandler(new HorizontalCellStyleStrategy(null, contentWriteCellStyle)) // 只配置内容策略，头部为null.build();// 填充屏规格表格数据screenTemplateExcelWriter.fill(new FillWrapper("screenGatherDTOList", screenGatherDTOList), writeSheet);// 填充第一个表头的单元格screenTemplateExcelWriter.fill(new FillWrapper("screenValueExcelDTOList", screenValueExcelDTOList), writeSheet);// 填充表头模板参数screenTemplateExcelWriter.fill(new FillWrapper("screenTableExcelDTOList", screenTableExcelDTOList), writeSheet);screenTemplateExcelWriter.finish();// excel导出成流byte[] bytes = screenTemplateOut.toByteArray();screenTemporaryTemplate = new ByteArrayInputStream(bytes);// --------------------------------第一次导出--------------------------------// --------------------------模拟获取第二部分数据--------------------------// 模拟获取第二部分的表头数据List<ScreenExcelDTO> screenScoreExcelDTOList = this.getScoreExcelDTOList();// 模拟获取第二部分的表格数据Map<String, List<ScreenValueExcelDTO>> screenScoreMap = this.getScreenScoreMap(screenGatherDTOList);// --------------------------模拟获取第二部分的数据--------------------------// --------------------------------第二次导出--------------------------------// 测评模型表格数据开始索引int screenScoreCostFirstColumnIndex = 7;// 测评模型表格数据结束索引int screenScoreTargetEndColIndex = screenScoreCostFirstColumnIndex + screenScoreMap.get("screenValueTemplateParam0").size() - 1;// 导出最终文件ExcelWriter screenScoreExcelWriter = EasyExcel.write(screenBos) // 导出最终文件.withTemplate(screenTemporaryTemplate) // 以第一次导出的excel流，作为第二次导出的模板.registerWriteHandler(new ScreenScoreHeaderMergeStrategy(0, screenScoreExcelDTOList, 1, screenScoreCostFirstColumnIndex)) // 表头（模块）合并策略.registerWriteHandler(new ScreenScoreHeaderMergeStrategy(1, screenScoreExcelDTOList, 2, screenScoreCostFirstColumnIndex)) // 表头合并策略.registerWriteHandler(new ScreenScoreValueMergeStrategy(screenGatherDTOList, screenScoreCostFirstColumnIndex, screenScoreTargetEndColIndex, 5)) // 表格数据合并策略.registerWriteHandler(new ScreenScoreValueHorizontalMergeStrategy(screenGatherDTOList, screenScoreExcelDTOList, screenScoreCostFirstColumnIndex)) // 表格数据横向合并策略.registerWriteHandler(new HorizontalCellStyleStrategy(null, contentWriteCellStyle)) // 只配置内容策略，头部为null.build();// 填充测评模型表头数据screenScoreExcelWriter.fill(new FillWrapper("screenTableExcelDTOList", screenScoreExcelDTOList), fillConfig, writeSheet);// 填充测评模型表格数据screenScoreMap.forEach((k, v) -> screenScoreExcelWriter.fill(new FillWrapper(k, v), fillConfig, writeSheet));screenScoreExcelWriter.finish();// --------------------------------第二次导出--------------------------------} catch (IOException e) {throw new RuntimeException(e);} finally {// 防止出现异常，导致流关闭失败if (screenTemporaryTemplate != null) {try {screenTemporaryTemplate.close();} catch (IOException e) {throw new RuntimeException(e);}}}}/*** 模拟获取第二部分的表格数据** @param screenGatherDTOList* @return*/private Map<String, List<ScreenValueExcelDTO>> getScreenScoreMap(List<ScreenGatherDTO> screenGatherDTOList) {// 模拟这部分数据的字段没有落表，采用Map存储和处理数据Map<String, List<ScreenValueExcelDTO>> screenScoreMap = new LinkedHashMap<>();if (CollectionUtils.isNotEmpty(screenGatherDTOList)) {for (int j = 0; j < screenGatherDTOList.size(); j++) {Map<String, String> map = new LinkedHashMap<>();if ((j + 1) % 4 == 0) {map.put("项目", "总得分");} else if ((j + 1) % 3 == 0) {map.put("项目", "总权重得分");} else {map.put("项目", "实测值");}for (int i = 1; i <= 1; i++) {map.put("光学测试子项" + i, "1");}for (int i = 1; i <= 2; i++) {map.put("电学测试子项" + i, "2");}for (int i = 1; i <= 3; i++) {map.put("声学测试子项" + i, "3");}screenGatherDTOList.get(j).setScoreMap(map);}for (int i = 0; i < screenGatherDTOList.size(); i++) {List<ScreenValueExcelDTO> valueExcelDTOList = new ArrayList<>();Map<String, String> scoreMap = screenGatherDTOList.get(i).getScoreMap();if (MapUtils.isNotEmpty(scoreMap)) {scoreMap.forEach((k, v) -> {ScreenValueExcelDTO valueExcelDTO = new ScreenValueExcelDTO();valueExcelDTO.setValue(v);valueExcelDTOList.add(valueExcelDTO);});}// 填充表格数据screenScoreMap.put("screenValueTemplateParam" + i, valueExcelDTOList);}}return screenScoreMap;}/*** 模拟获取第二部分的表头数据** @return*/private List<ScreenExcelDTO> getScoreExcelDTOList() {List<ScreenExcelDTO> screenScoreExcelDTOList = new ArrayList<>();for (int i = 1; i <= 1; i++) {ScreenExcelDTO screenExcelDTO = new ScreenExcelDTO();screenExcelDTO.setModelName("产品测试");screenExcelDTO.setTestItemCategory("光学");screenExcelDTO.setTestItemName("光学");screenExcelDTO.setSubTestItemName("光学测试子项" + i);screenScoreExcelDTOList.add(screenExcelDTO);}for (int i = 1; i <= 2; i++) {ScreenExcelDTO screenExcelDTO = new ScreenExcelDTO();screenExcelDTO.setModelName("产品测试");screenExcelDTO.setTestItemCategory("电学");screenExcelDTO.setTestItemName("电学");screenExcelDTO.setSubTestItemName("电学测试子项" + i);screenScoreExcelDTOList.add(screenExcelDTO);}for (int i = 1; i <= 3; i++) {ScreenExcelDTO screenExcelDTO = new ScreenExcelDTO();screenExcelDTO.setModelName("产品测试");screenExcelDTO.setTestItemCategory("声学");screenExcelDTO.setTestItemName("声学");screenExcelDTO.setSubTestItemName("声学测试子项" + i);screenScoreExcelDTOList.add(screenExcelDTO);}return screenScoreExcelDTOList;}/*** 在屏规格末尾加上表头模板参数** @return*/private List<ScreenValueExcelDTO> getScreenTableExcelDTOList() {List<ScreenValueExcelDTO> screenTableExcelDTOList = new ArrayList<>();for (int i = 0; i < 4; i++) {ScreenValueExcelDTO screenTableExcelDTO = new ScreenValueExcelDTO();switch (i) {case 0:screenTableExcelDTO.setValue("{screenTableExcelDTOList.modelName}");break;case 1:screenTableExcelDTO.setValue("{screenTableExcelDTOList.testItemCategory}");break;case 2:screenTableExcelDTO.setValue("{screenTableExcelDTOList.testItemName}");break;case 3:screenTableExcelDTO.setValue("{screenTableExcelDTOList.subTestItemName}");break;default:break;}screenTableExcelDTOList.add(screenTableExcelDTO);}return screenTableExcelDTOList;}/*** 填充第一个表头的单元格** @return*/private List<ScreenValueExcelDTO> getScreenValueExcelDTOList() {ScreenValueExcelDTO screenValueExcelDTO = new ScreenValueExcelDTO();List<ScreenValueExcelDTO> screenValueExcelDTOList = new ArrayList<>();screenValueExcelDTO.setValue("产品测试");screenValueExcelDTOList.add(screenValueExcelDTO);return screenValueExcelDTOList;}/*** 构造第一部分产品数据** @return*/private List<ScreenGatherDTO> getScreenGatherDTOList() {List<ScreenGatherDTO> screenGatherDTOList = new ArrayList<>();// 构造5个产品数据for (int i = 1; i <= 5; i++) {// 每份数据乘以4，为了合并单元格做准备for (int j = 0; j < 4; j++) {ScreenGatherDTO screenGatherDTO = new ScreenGatherDTO();screenGatherDTO.setScreenSize(String.valueOf(i * 10));screenGatherDTO.setSupplier("厂商" + i);screenGatherDTO.setPartMode("型号" + i);screenGatherDTO.setResolution("1080P");screenGatherDTO.setRefreshRate("60Hz");screenGatherDTO.setPanel("IPS");screenGatherDTOList.add(screenGatherDTO);}}if (CollectionUtils.isNotEmpty(screenGatherDTOList)) {for (int i = 0; i < screenGatherDTOList.size(); i++) {// 在屏规格末尾加上表格模板参数screenGatherDTOList.get(i).setValueTemplateParam("{screenValueTemplateParam" + i + ".value}");}}return screenGatherDTOList;}/*** 设置内容的策略** @return*/private WriteCellStyle getWriteCellStyle() {WriteCellStyle contentWriteCellStyle = new WriteCellStyle();// 设置内容水平居中对齐contentWriteCellStyle.setHorizontalAlignment(HorizontalAlignment.CENTER);// 设置内容垂直居中对齐contentWriteCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);// 自动换行contentWriteCellStyle.setWrapped(true);// 设置字体样式和大小WriteFont contentWriteFont = new WriteFont();contentWriteFont.setFontHeightInPoints((short) 12);contentWriteFont.setFontName("微软雅黑");contentWriteCellStyle.setWriteFont(contentWriteFont);return contentWriteCellStyle;}/*** HttpServletResponse消息头参数设置** @param httpServletResponse*/private void setHttpServletResponse(HttpServletResponse httpServletResponse) {String filename = "exportFile.xlsx";httpServletResponse.addHeader(HttpHeaders.CONTENT_DISPOSITION, "attachment;filename=" + filename);httpServletResponse.setContentType("application/octet-stream;charset=UTF-8");httpServletResponse.addHeader("Pragma", "no-cache");httpServletResponse.addHeader("Cache-Control", "no-cache");}}

5.3.2 ScreenService

import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.IOException;/*** @author Cauli* @date /12/1 9:47* @description 业务层*/public interface ScreenService {/*** 导出** @param httpServletRequest* @param httpServletResponse*/void export(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse);}

⭐5.4 strategy

5.4.1 ScreenValueMergeStrategy

import com.alibaba.excel.metadata.Head;import com.alibaba.excel.write.merge.AbstractMergeStrategy;import com.example.demo.dto.ScreenGatherDTO;import org.apache.poi.ss.usermodel.Cell;import org.apache.poi.ss.usermodel.Sheet;import org.apache.poi.ss.util.CellRangeAddress;import org.springframework.util.CollectionUtils;import java.util.ArrayList;import java.util.List;/*** @author yicheng1.he* @date /12/1 14:06* @description 第一部分表格数据合并策略*/public class ScreenValueMergeStrategy extends AbstractMergeStrategy {/*** 分组，每几行合并一次*/private List<Integer> exportFieldGroupCountList;/*** 合并的目标开始列索引*/private Integer targetBeginColIndex;/*** 合并的目标结束列索引*/private Integer targetEndColIndex;/*** 需要开始合并单元格的首行索引*/private Integer firstRowIndex;public ScreenValueMergeStrategy() {}/*** @param exportDataList待合并目标行的值* @param targetBeginColIndex 合并的目标开始列索引* @param targetEndColIndex 合并的目标结束列索引* @param firstRowIndex 需要开始合并单元格的首行索引*/public ScreenValueMergeStrategy(List<ScreenGatherDTO> exportDataList, Integer targetBeginColIndex, Integer targetEndColIndex, Integer firstRowIndex) {this.exportFieldGroupCountList = getGroupCountList(exportDataList);this.targetBeginColIndex = targetBeginColIndex;this.targetEndColIndex = targetEndColIndex;this.firstRowIndex = firstRowIndex;}@Overrideprotected void merge(Sheet sheet, Cell cell, Head head, Integer relativeRowIndex) {if (cell.getRowIndex() == this.firstRowIndex && cell.getColumnIndex() >= targetBeginColIndex - 1 && cell.getColumnIndex() <= targetEndColIndex - 1) {int rowCount = this.firstRowIndex;for (Integer count : exportFieldGroupCountList) {if (count == 1) {rowCount += count;continue;}// 合并单元格CellRangeAddress cellRangeAddress;for (int i = 0; i < targetEndColIndex - targetBeginColIndex + 1; i++) {cellRangeAddress = new CellRangeAddress(rowCount - 1, rowCount + count - 2, i, i);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** @param exportDataList* @return*/private List<Integer> getGroupCountList(List<ScreenGatherDTO> exportDataList) {if (CollectionUtils.isEmpty(exportDataList)) {return new ArrayList<>();}List<Integer> groupCountList = new ArrayList<>();int count = 1;for (int i = 1; i < exportDataList.size(); i++) {boolean equals = exportDataList.get(i).getPartMode().equals(exportDataList.get(i - 1).getPartMode());if (equals) {count++;} else {groupCountList.add(count);count = 1;}}// 处理完最后一条后groupCountList.add(count);return groupCountList;}}

5.4.2 ScreenScoreHeaderMergeStrategy

import com.alibaba.excel.metadata.Head;import com.alibaba.excel.write.merge.AbstractMergeStrategy;import com.example.demo.dto.ScreenExcelDTO;import org.apache.poi.ss.usermodel.Cell;import org.apache.poi.ss.usermodel.Sheet;import org.apache.poi.ss.util.CellRangeAddress;import org.springframework.util.CollectionUtils;import java.util.ArrayList;import java.util.List;/*** @author Cauli* @date /12/1 15:51* @description 第二部分表头合并策略*/public class ScreenScoreHeaderMergeStrategy extends AbstractMergeStrategy {/*** 分组，每几列合并一次*/private List<Integer> exportFieldGroupCountList;/*** 目标合并行index*/private Integer targetRowIndex;/*** 需要开始合并单元格的首列index*/private Integer firstColumnIndex;/*** 0:表头 1：分类 2：测试项*/private Integer mergeMark;/*** 额外队尾数量*/private static final Integer TAILS_LENGTH = 2;/*** 表头第零行索引*/private static final Integer HEADER_ROW_ZERO = 0;/*** 表头第一行索引*/private static final Integer HEADER_ROW_ONE = 1;/*** 表头第二行索引*/private static final Integer HEADER_ROW_TWO = 2;public ScreenScoreHeaderMergeStrategy() {}/*** @param mergeMark 0:表头 1：分类 2：测试项* @param exportDataList 为待合并目标列的值* @param targetRowIndex 合并的目标行索引* @param firstColumnIndex 需要开始合并单元格的首列索引*/public ScreenScoreHeaderMergeStrategy(Integer mergeMark, List<ScreenExcelDTO> exportDataList, Integer targetRowIndex, Integer firstColumnIndex) {this.mergeMark = mergeMark;this.exportFieldGroupCountList = getGroupCountList(exportDataList);this.targetRowIndex = targetRowIndex;this.firstColumnIndex = firstColumnIndex;}@Overrideprotected void merge(Sheet sheet, Cell cell, Head head, Integer relativeRowIndex) {if (cell.getColumnIndex() == this.firstColumnIndex && cell.getRowIndex() == targetRowIndex - 1) {int columnCount = this.firstColumnIndex;for (Integer count : exportFieldGroupCountList) {// 合并单元格CellRangeAddress cellRangeAddress = null;if (mergeMark == 0) {cellRangeAddress = new CellRangeAddress(targetRowIndex - 1, targetRowIndex - 1, columnCount - 1, columnCount + count - 1);} else if (mergeMark == 1) {if (count == 1) {cellRangeAddress = new CellRangeAddress(HEADER_ROW_ONE, HEADER_ROW_TWO, columnCount, columnCount);} else {cellRangeAddress = new CellRangeAddress(HEADER_ROW_ONE, HEADER_ROW_TWO, columnCount, columnCount + count - 1);}}sheet.addMergedRegionUnsafe(cellRangeAddress);columnCount += count;}}}/*** 该方法将目标列根据值是否相同连续可合并，存储可合并的列数** @param exportDataList* @return*/private List<Integer> getGroupCountList(List<ScreenExcelDTO> exportDataList) {if (CollectionUtils.isEmpty(exportDataList)) {return new ArrayList<>();}List<Integer> groupCountList = new ArrayList<>();int count = 1;for (int i = 1; i < exportDataList.size(); i++) {boolean equals = false;if (0 == mergeMark) {equals = exportDataList.get(i).getModelName().equals(exportDataList.get(i - 1).getModelName());} else {equals = exportDataList.get(i).getTestItemName().equals(exportDataList.get(i - 1).getTestItemName());}if (equals) {count++;} else {groupCountList.add(count);count = 1;}}// 处理完最后一条后groupCountList.add(count);return groupCountList;}}

4.5.3 ScreenScoreValueMergeStrategy

import com.alibaba.excel.metadata.Head;import com.alibaba.excel.write.merge.AbstractMergeStrategy;import com.example.demo.dto.ScreenGatherDTO;import org.apache.poi.ss.usermodel.Cell;import org.apache.poi.ss.usermodel.Sheet;import org.apache.poi.ss.util.CellRangeAddress;import org.springframework.util.CollectionUtils;import java.util.ArrayList;import java.util.List;/*** @author yicheng1.he* @date /12/1 14:06* @description 第二部分表格数据合并策略*/public class ScreenScoreValueMergeStrategy extends AbstractMergeStrategy {/*** 分组，每几行合并一次*/private List<Integer> exportFieldGroupCountList;/*** 合并的目标开始列索引*/private Integer targetBeginColIndex;/*** 合并的目标结束列索引*/private Integer targetEndColIndex;/*** 需要开始合并单元格的首行索引*/private Integer firstRowIndex;/*** 额外的长度为2*/private static final Integer ADDITIONAL_LENGTH = 2;public ScreenScoreValueMergeStrategy() {}/*** @param exportDataList待合并目标行的值* @param targetBeginColIndex 合并的目标开始列* @param targetEndColIndex 合并的目标结束列索引* @param firstRowIndex 需要开始合并单元格的首行索引*/public ScreenScoreValueMergeStrategy(List<ScreenGatherDTO> exportDataList, Integer targetBeginColIndex, Integer targetEndColIndex, Integer firstRowIndex) {this.exportFieldGroupCountList = getGroupCountList(exportDataList);this.targetBeginColIndex = targetBeginColIndex;this.targetEndColIndex = targetEndColIndex;this.firstRowIndex = firstRowIndex;}@Overrideprotected void merge(Sheet sheet, Cell cell, Head head, Integer relativeRowIndex) {if (cell.getRowIndex() == this.firstRowIndex && cell.getColumnIndex() >= targetBeginColIndex - 1 && cell.getColumnIndex() <= targetEndColIndex - 1) {int rowCount = this.firstRowIndex;for (Integer count : exportFieldGroupCountList) {if (count == 1) {rowCount += count;continue;}// 合并单元格CellRangeAddress cellRangeAddress;for (int i = targetBeginColIndex - 1; i <= targetEndColIndex - 1; i++) {cellRangeAddress = new CellRangeAddress(rowCount - 1, rowCount - 1 + count - 1, i, i);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** @param exportDataList* @return*/private List<Integer> getGroupCountList(List<ScreenGatherDTO> exportDataList) {if (CollectionUtils.isEmpty(exportDataList)) {return new ArrayList<>();}List<Integer> groupCountList = new ArrayList<>();int count = 1;for (int i = 1; i < exportDataList.size(); i++) {boolean equals = exportDataList.get(i).getPartMode().equals(exportDataList.get(i - 1).getPartMode());if (equals) {count++;} else {groupCountList.add(count - ADDITIONAL_LENGTH);groupCountList.add(1);groupCountList.add(1);count = 1;}}// 处理完最后一条后groupCountList.add(count - ADDITIONAL_LENGTH);groupCountList.add(1);groupCountList.add(1);return groupCountList;}}

5.4.3 ScreenScoreValueHorizontalMergeStrategy

import com.alibaba.excel.metadata.Head;import com.alibaba.excel.write.merge.AbstractMergeStrategy;import com.example.demo.dto.ScreenExcelDTO;import com.example.demo.dto.ScreenGatherDTO;import org.apache.poi.ss.usermodel.Cell;import org.apache.poi.ss.usermodel.Sheet;import org.apache.poi.ss.util.CellRangeAddress;import org.springframework.util.CollectionUtils;import java.util.ArrayList;import java.util.List;/*** @author yicheng1.he* @date /12/1 15:51* @description 第二部分表头横向合并策略*/public class ScreenScoreValueHorizontalMergeStrategy extends AbstractMergeStrategy {/*** 分组，每几行合并一次*/private List<Integer> rowFieldGroupCountList;/*** 分组，每几列合并一次*/private List<Integer> colFieldGroupCountList;/*** 目标合并列索引*/private Integer targetColIndex;/*** 需要合并的行索引*/private Integer targetRowIndex;/*** 需要开始合并单元格的首列索引*/private Integer firstColumnIndex;/*** 表格数据第一行索引*/private static final Integer FIRST_ROW_INDEX = 5;/*** 额外的长度为2*/private static final Integer ADDITIONAL_LENGTH = 2;public ScreenScoreValueHorizontalMergeStrategy() {}/*** @param screenGatherDTOList为待合并目标行的值* @param screenScoreExcelDTOList 为待合并目标列的值* @param firstColumnIndex 需要开始合并单元格的首列索引*/public ScreenScoreValueHorizontalMergeStrategy(List<ScreenGatherDTO> screenGatherDTOList, List<ScreenExcelDTO> screenScoreExcelDTOList, Integer firstColumnIndex) {this.rowFieldGroupCountList = getRowGroupCountList(screenGatherDTOList);this.colFieldGroupCountList = getColGroupCountList(screenScoreExcelDTOList);this.firstColumnIndex = firstColumnIndex;this.targetRowIndex = FIRST_ROW_INDEX;}@Overrideprotected void merge(Sheet sheet, Cell cell, Head head, Integer relativeRowIndex) {if (cell.getColumnIndex() == this.firstColumnIndex) {int columnCount = this.firstColumnIndex;// 列合并for (int i = 0; i < colFieldGroupCountList.size(); i++) {Integer count = colFieldGroupCountList.get(i);if (count == 1) {columnCount += count;continue;}// 行合并int rowIndexCount = 0;for (int j = 0; j < rowFieldGroupCountList.size(); j++) {if (j == 0) {rowIndexCount += this.targetRowIndex + rowFieldGroupCountList.get(j);} else {rowIndexCount += rowFieldGroupCountList.get(j);}CellRangeAddress cellRangeAddress = new CellRangeAddress(rowIndexCount - ADDITIONAL_LENGTH - 1, rowIndexCount - ADDITIONAL_LENGTH - 1, columnCount, columnCount + count - 1);sheet.addMergedRegionUnsafe(cellRangeAddress);cellRangeAddress = new CellRangeAddress(rowIndexCount - ADDITIONAL_LENGTH, rowIndexCount - ADDITIONAL_LENGTH, columnCount, columnCount + count - 1);sheet.addMergedRegionUnsafe(cellRangeAddress);}columnCount += count;}}}/*** 该方法将目标列根据值是否相同连续可合并，存储可合并的列数* 防止每个产品行数不同、不一定是4行的情况，该方法计算出每个产品的行数** @param exportDataList* @return*/private List<Integer> getRowGroupCountList(List<ScreenGatherDTO> exportDataList) {if (CollectionUtils.isEmpty(exportDataList)) {return new ArrayList<>();}List<Integer> groupCountList = new ArrayList<>();int count = 1;for (int i = 1; i < exportDataList.size(); i++) {boolean equals = exportDataList.get(i).getPartMode().equals(exportDataList.get(i - 1).getPartMode());if (equals) {count++;} else {groupCountList.add(count);count = 1;}}// 处理完最后一条后groupCountList.add(count);return groupCountList;}/*** 该方法将目标列根据值是否相同连续可合并，存储可合并的列数** @param exportDataList* @return*/private List<Integer> getColGroupCountList(List<ScreenExcelDTO> exportDataList) {if (CollectionUtils.isEmpty(exportDataList)) {return new ArrayList<>();}List<Integer> groupCountList = new ArrayList<>();int count = 1;for (int i = 1; i < exportDataList.size(); i++) {boolean equals = exportDataList.get(i).getTestItemName().equals(exportDataList.get(i - 1).getTestItemName());if (equals) {count++;} else {groupCountList.add(count);count = 1;}}// 处理完最后一条后groupCountList.add(count);return groupCountList;}}

5.5 dto

5.5.1 ScreenExcelDTO

import lombok.Data;import lombok.ToString;import java.io.Serializable;/*** @author Cauli* @date /12/1 9:48* @description excel模板参数返回数据模型*/@Data@ToStringpublic class ScreenExcelDTO implements Serializable {/*** 模块名称*/private String modelName;/*** 测试项名称*/private String testItemName;/*** 测试子项名称*/private String subTestItemName;/*** 分类名称*/private String testItemCategory;/*** 测试项值*/private String testItemValue;}

5.5.2 ScreenGatherDTO

import lombok.Data;import lombok.ToString;import java.util.Map;/*** @author Cauli* @date /12/1 15:10* @description 查询返回数据模型*/@Data@ToStringpublic class ScreenGatherDTO {/*** 产品型号*/private String partMode;/*** 厂商*/private String supplier;/*** 屏幕尺寸*/private String screenSize;/*** 屏幕分辨率*/private String resolution;/*** 屏幕刷新率*/private String refreshRate;/*** 面板属性*/private String panel;/*** 用于存储得分模块map*/private Map<String, String> scoreMap;/*** 表头数据模板参数*/private String valueTemplateParam;/*** 表格数据模板参数*/private String headerTemplateParam;}

5.5.3 ScreenValueExcelDTO

import java.io.Serializable;/*** @author Cauli* @date: /12/1 20:20* @description: excel值返回数据模型*/public class ScreenValueExcelDTO implements Serializable {private String value;public String getValue() {return value;}public void setValue(String value) {this.value = value;}@Overridepublic String toString() {return "ScreenValueExcelDTO{" +"value='" + value + '\'' +'}';}}