添加依赖

<repository>
			<id>AsposeJavaAPI</id>
			<name>Aspose Java API</name>
			<url>https://repository.aspose.com/repo/</url>
</repository>


	<dependency>
			<groupId>com.aspose</groupId>
			<artifactId>aspose-cells</artifactId>
			<version>21.9</version>
		</dependency>

核心工具类

package com.cn.travel.web.test;

import com.aspose.cells.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import javax.imageio.ImageIO;
import javax.imageio.stream.ImageOutputStream;
import java.awt.image.BufferedImage;
import java.io.*;

/**
 * excel转图片工具类
 */
public class AsposeUtil {

    /**
     * excel转图片
     * @param in 输入流
     */
//    public static void toJPG(InputStream in) {
    public static InputStream toJPG(InputStream in) throws Exception{
        try {
            Workbook book = new Workbook(in);
            Worksheet sheet = book.getWorksheets().get(0);

            // 设置图片的上下左右的白边宽度
            sheet.getPageSetup().setLeftMargin(-10);
            sheet.getPageSetup().setRightMargin(1);
            sheet.getPageSetup().setBottomMargin(1);
            sheet.getPageSetup().setTopMargin(1);

            ImageOrPrintOptions imgOptions = new ImageOrPrintOptions();
            imgOptions.setImageFormat(ImageFormat.getJpeg());
            imgOptions.setCellAutoFit(true);
            imgOptions.setOnePagePerSheet(true);
            SheetRender render = new SheetRender(sheet, imgOptions);
            // 已经转好的图片流
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            render.toImage(0, out);

            // 截取图片去除水印
            InputStream inputStream = new ByteArrayInputStream(out.toByteArray());
            BufferedImage image = ImageIO.read(inputStream);
            image = image.getSubimage(0, 20, image.getWidth(), image.getHeight()-20);

            //生成于本地
//            ImageIO.write(image, "png", new File("E:\\aa\\bb.jpg"));

            //返回输入流
            InputStream is = null;
            ByteArrayOutputStream bs = new ByteArrayOutputStream();
            ImageOutputStream imOut;

                imOut = ImageIO.createImageOutputStream(bs);
                ImageIO.write(image, "png", imOut);
                is= new ByteArrayInputStream(bs.toByteArray());

            return is;

        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }


}

controller

@RestController
//@RequestMapping("/test")
public class TestController {

@GetMapping("/exportPic")
    public void exportPic(HttpServletResponse response) throws Exception {

        TemplateExportParams params = new TemplateExportParams(
                "templates/10仓zz.xlsx");
        Map<String, Object> map = new HashMap<>();
        map.put("purchasePlanNo", "123456");
        map.put("boxesSum", 2);
        map.put("torrentSum", "2");
        List<Map<String, Object>> invoiceData = new ArrayList<>();
        for (int i = 0; i < 2; i++) {
            Map<String, Object> lm = new HashMap<>();
            lm.put("id", i);
            lm.put("recordCommodityId", 44796);
            lm.put("booksForReferenceNumber", 2);
            lm.put("nsNo", "NS8070");
            lm.put("customsRecordNumber", "10500051");
            lm.put("commodityInspectionRecordNumber", "");
            lm.put("hsCode", "3401199090");
            lm.put("commodityBrand", "LION狮王");
            lm.put("barcode", "202108270002");
            lm.put("productName", "LION狮王 趣净除菌湿巾 无酒精 10片");
            lm.put("quantity", 50);
            lm.put("recordMeasurement", "袋");
            lm.put("singlePrice", 100);
            lm.put("totalPrice", 5000);
            lm.put("originCountry", "日本");
            lm.put("repeatRemark", "存在重复备案");
            invoiceData.add(lm);
        }
        map.put("invoiceData", invoiceData);
        map.put("year", 2021);
        map.put("month", 9);
        map.put("day", 13);

        Workbook workbook = ExcelExportUtil.exportExcel(params, map);
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        try {
            workbook.write(os);
        } catch (IOException e) {
            e.printStackTrace();
        }
        byte[] content = os.toByteArray();
        InputStream inputStream = new ByteArrayInputStream(content);
        InputStream in = AsposeUtil.toJPG(inputStream);
//        AsposeUtil.toJPG(in);

        OutputStream out = null;
        try {
            //设置文件MIME类型
            String fileName = "aa.jpg";
            response.setContentType("application/octet-stream");
            try {
                fileName = new String((fileName).getBytes("gb2312"), "ISO8859-1");
            } catch (UnsupportedEncodingException e1) {
                e1.printStackTrace();
            }
            //设置Content-Disposition
            response.setHeader("Content-Disposition", "attachment;filename=" + fileName);
            out = response.getOutputStream();
            int b;
            while ((b = in.read()) != -1) {
                out.write(b);
            }
            out.flush();
            in.close();
            out.close();
        } finally {
            try {
                if (null != in) {
                    in.close();
                }
                if (null != out) {
                    out.close();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}