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); |
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(); } } |
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()); } } |
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 ); |
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
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