方式一：
新增一个名为序号的列,设置导出格式为：isAddIndex
不要在ExportParams 中设置addIndex 为true 这个没啥用
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List<ExcelExportEntity> colList = new ArrayList<ExcelExportEntity>();
//自动新增首列序号
ExcelExportEntity xh = new ExcelExportEntity("序号", "xh");
xh.setFormat("isAddIndex");
colList.add(xh);
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方式二：
第一步：重新定义一个ExcelExportUtil(easypoi 中的ExcelExportUtil是被final 修饰的)
如下图所示: SubExcelExportService是我们继承easypoi 的ExcelExportService 并重写了insertDataToSheet()方法。
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import java.io.OutputStream;
import java.net.URLEncoder;
import java.util.Collection;
import java.util.List;
import javax.servlet.http.HttpServletResponse;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import cn.afterturn.easypoi.excel.entity.ExportParams;
import cn.afterturn.easypoi.excel.entity.enmus.ExcelType;
import cn.afterturn.easypoi.excel.entity.params.ExcelExportEntity;
public class ExcelExportUtil {
public static Workbook exportExcel(ExportParams entity, List<ExcelExportEntity> entityList, Collection<?> dataSet) {
Workbook workbook =getWorkbook(entity.getType(),dataSet.size());;
new SubExcelExportService().createSheetForMap(workbook, entity, entityList, dataSet);
return workbook;
}
public static Workbook exportExcel(ExportParams entity, Class<?> pojoClass, Collection<?> dataSet) {
Workbook workbook =getWorkbook(entity.getType(), dataSet.size());
new SubExcelExportService().createSheet(workbook, entity, pojoClass, dataSet);
return workbook;
}
private static Workbook getWorkbook(ExcelType type, int size) {
if (ExcelType.HSSF.equals(type)) {
return new HSSFWorkbook();
} else if (size < 100000) {
return new XSSFWorkbook();
} else {
return new SXSSFWorkbook();
}
}
public static void exportExcel(HttpServletResponse response, Workbook workbook) throws Exception {
response.reset();
response.setContentType("application/vnd.ms-excel");
String fileName = System.currentTimeMillis() + ".xlsx";
response.setHeader("Content-disposition", "attachment; filename=" + URLEncoder.encode(fileName, "UTF-8"));
response.setCharacterEncoding("UTF-8");
OutputStream output = response.getOutputStream();
workbook.write(output);
workbook.close();
output.close();
}
}
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第二步：继承ExcelExportService 并重写insertDataToSheet()方法
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import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import org.apache.poi.ss.usermodel.Drawing;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import cn.afterturn.easypoi.excel.entity.ExportParams;
import cn.afterturn.easypoi.excel.entity.params.ExcelExportEntity;
import cn.afterturn.easypoi.excel.export.ExcelExportService;
import cn.afterturn.easypoi.excel.export.styler.IExcelExportStyler;
import cn.afterturn.easypoi.exception.excel.ExcelExportException;
import cn.afterturn.easypoi.exception.excel.enums.ExcelExportEnum;
import cn.afterturn.easypoi.util.PoiExcelGraphDataUtil;
public class SubExcelExportService extends ExcelExportService {
private static intMAX_NUM= 60000;
@Override
protected void insertDataToSheet(Workbook workbook, ExportParams entity, List<ExcelExportEntity> entityList,
Collection<?> dataSet, Sheet sheet) {
try {
dataHandler = entity.getDataHandler();
if (dataHandler != null && dataHandler.getNeedHandlerFields() != null) {
needHandlerList = Arrays.asList(dataHandler.getNeedHandlerFields());
}
dictHandler = entity.getDictHandler();
i18nHandler = entity.getI18nHandler();
// 创建表格样式
setExcelExportStyler(
(IExcelExportStyler) entity.getStyle().getConstructor(Workbook.class).newInstance(workbook));
Drawing patriarch = PoiExcelGraphDataUtil.getDrawingPatriarch(sheet);
List<ExcelExportEntity> excelParams = new ArrayList<ExcelExportEntity>();
if (entity.isAddIndex()) {
excelParams.add(indexExcelEntity(entity));
}
excelParams.addAll(entityList);
int index = entity.isCreateHeadRows() ? createHeaderAndTitle(entity, sheet, workbook, excelParams) : 0;
int titleHeight = index;
setCellWith(excelParams, sheet);
setColumnHidden(excelParams, sheet);
short rowHeight = entity.getHeight() != 0 ? entity.getHeight() : getRowHeight(excelParams);
setCurrentIndex(1);
Iterator<?> its = dataSet.iterator();
List<Object> tempList = new ArrayList<Object>();
while (its.hasNext()) {
Object t = its.next();
index += createCells(patriarch, index, t, excelParams, sheet, workbook, rowHeight, 0)[0];
tempList.add(t);
if (index >=MAX_NUM) {
break;
}
}
if (entity.getFreezeCol() != 0) {
sheet.createFreezePane(entity.getFreezeCol(), 0, entity.getFreezeCol(), 0);
}
mergeCells(sheet, excelParams, titleHeight);
its = dataSet.iterator();
for (int i = 0, le = tempList.size(); i < le; i++) {
its.next();
its.remove();
}
if (LOGGER.isDebugEnabled()) {
LOGGER.debug("List data more than max ,data size is {}", dataSet.size());
}
// 发现还有剩余list 继续循环创建Sheet
if (dataSet.size() > 0) {
createSheetForMap(workbook, entity, entityList, dataSet);
} else {
// 创建合计信息
addStatisticsRow(getExcelExportStyler().getStyles(true, null), sheet);
}
} catch (Exception e) {
LOGGER.error(e.getMessage(), e);
throw new ExcelExportException(ExcelExportEnum.EXPORT_ERROR, e.getCause());
}
}
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第三步：设置导出文件的时候自动新增序号
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ExportParams params = new ExportParams();
params.setAddIndex(true);
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注意事项：ExcelExportUtil需要使用我们自己定义的(不要使用easyPoi的)，ExcelExportUtil.exportExcel()中的 ExcelExportService 一定要使用我们自己定义的SubExcelExportService详细参考上图中的示例。
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原文链接：https://blog.csdn.net/qq_40249955/article/details/120491911