apache poi 导出复杂的excel表格

如何导出复杂的excel 表格

如图表格，存在行和列的合并，边框，样式，颜色等。

依赖

 <!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>4.1.2</version>
        </dependency>

实现的示例demo

 @GetMapping("/exportExcel")
    public void exportExcel(HttpServletRequest request, HttpServletResponse response) {

        try {
            HSSFWorkbook workbook = new HSSFWorkbook();//创建一个excel对象
            HSSFSheet sheet = workbook.createSheet();//创建一个工作薄对象

            HSSFRow row = sheet.createRow(0);
            HSSFCell createCell = row.createCell(0);
//            sheet.addMergedRegion(CellRangeAddress.valueOf("$A$1:$E$1"));//单元格合并
            HSSFCellStyle cellStyle = workbook.createCellStyle();
            cellStyle.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.getIndex());//25%灰色
            cellStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);

            //颜色
            cellStyle.setBottomBorderColor(IndexedColors.BLACK.getIndex());
            cellStyle.setTopBorderColor(IndexedColors.BLACK.getIndex());
            cellStyle.setLeftBorderColor(IndexedColors.BLACK.getIndex());
            cellStyle.setRightBorderColor(IndexedColors.BLACK.getIndex());

            // 设置边框样式为细线
            cellStyle.setBorderRight(BorderStyle.THIN);
            cellStyle.setBorderLeft(BorderStyle.THIN);
            cellStyle.setBorderTop(BorderStyle.THIN);
            cellStyle.setBorderBottom(BorderStyle.THIN);

            //字体水平和垂直居中
            cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);//垂直居中
            cellStyle.setAlignment(HorizontalAlignment.CENTER);//水平居中
            HSSFFont font = workbook.createFont();

            //字体,大小，粗细
            font.setFontName("宋体");
            font.setFontHeight((short) 20);
            font.setBold(true);//加粗
            cellStyle.setFont(font);
            createCell.setCellStyle(cellStyle);
            createCell.setCellValue("活动统计报表");
//            CellRangeAddress mergedRegion = new CellRangeAddress(0, 0, 0, 4);
            CellRangeAddress mergedRegion = CellRangeAddress.valueOf("$A$1:$E$1");
            sheet.addMergedRegion(mergedRegion);//单元格合并
            RegionUtil.setBorderTop(BorderStyle.THIN, mergedRegion, sheet);
            // 合并 A1:E1 设置边框粗细
            RegionUtil.setBorderTop(BorderStyle.THIN, mergedRegion, sheet);
            RegionUtil.setBorderBottom(BorderStyle.THIN, mergedRegion, sheet);
            RegionUtil.setBorderLeft(BorderStyle.THIN, mergedRegion, sheet);
            RegionUtil.setBorderRight(BorderStyle.THIN, mergedRegion, sheet);


            row = sheet.createRow(1);
            createCell = row.createCell(0);
            font.setFontHeightInPoints((short) 12);
            font.setBold(true);
            cellStyle.setFont(font);
            createCell.setCellValue("2024-01-01~2024-01-31");
            createCell.setCellStyle(cellStyle);

            sheet.autoSizeColumn(0);
            sheet.autoSizeColumn(1);

            List<String> headerList = Arrays.asList("项目", "", "活动类型", "参数人数", "经费");
            List<List<String>> listData = new ArrayList<>();
            listData.add(Arrays.asList("球类赛事", "", "篮球", "16", "158"));
            listData.add(Arrays.asList("", "", "羽毛球", "8", "231"));
            listData.add(Arrays.asList("", "", "网球", "23", "143"));

            font.setBold(true);
            cellStyle.setFont(font);

            for (int j = 0; j < listData.size(); j++) {
                row = sheet.createRow(j + 3);
                List<String> strings = listData.get(j);
                for (int k = 0; k < headerList.size(); k++) {
                    createCell = row.createCell(k, CellType.STRING);
                    createCell.setCellStyle(cellStyle);
                    String text = strings.get(k);
                    text = null == text ? "" : text;
                    createCell.setCellValue(text);
                    sheet.autoSizeColumn(k);
                }
            }


            sheet.addMergedRegion(CellRangeAddress.valueOf("$A$2:$E$2"));
            sheet.addMergedRegion(CellRangeAddress.valueOf("$A$3:$E$3"));
            sheet.addMergedRegion(CellRangeAddress.valueOf("$A$4:$B$6"));

            ExcelUtil.setFileDownloadHeader(request, response, "测试" + System.currentTimeMillis() + ".xls");
            OutputStream outputStream = response.getOutputStream();
            workbook.write(outputStream);
            workbook.close();
            logger.info("导出成功");
        } catch (Exception e) {
            logger.error("导出失败", e);
        }
    }

import org.apache.commons.lang.StringUtils;
import org.apache.poi.ss.util.CellReference;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;


public class ExcelUtil {
    private static final Logger logger = LoggerFactory.getLogger(ExcelUtil.class);


    public static void setFileDownloadHeader(HttpServletRequest request, HttpServletResponse response, String fileName) {
        String userAgent = request.getHeader("USER-AGENT");
        try {
            String finalFileName = null;
            if (StringUtils.contains(userAgent, "MSIE") || StringUtils.contains(userAgent, "Trident")) {
                finalFileName = URLEncoder.encode(fileName, "UTF8");
            } else if (StringUtils.contains(userAgent, "Mozilla")) {
                finalFileName = new String(fileName.getBytes(), "ISO8859-1");
            } else {
                finalFileName = URLEncoder.encode(fileName, "UTF8");
            }

            response.setHeader("Cache-Control", "private");
            response.setHeader("Pragma", "private");
            response.setContentType("application/vnd.ms-excel;charset=utf-8");
            response.setHeader("Content-Type", "application/force-download");
            response.setHeader("Content-Disposition", "attachment;filename=\"" + finalFileName + "\"");
        } catch (UnsupportedEncodingException e) {
            logger.error("导出设置错误", e);
        }

    }


    public static String columnIndexToColumnName(int columnIndex) {
        String string = CellReference.convertNumToColString(16384);
        return string;
    }
}