引入Jar包可参考本文章

 //需要先转换成InputStream 返回的是byte
 InputStream inputStream = FileUtils.workbookToInputStream(workbook);
 ByteArrayOutputStream stream = new ByteArrayOutputStream();
 byte[] bytes = PdfConverUtil.workbookToPdf(inputStream, stream);

package com.diye.gw.hotelapisystem.util;

import com.aspose.cells.License;
import com.aspose.cells.PdfSaveOptions;
import com.aspose.cells.Workbook;
import lombok.extern.log4j.Log4j2;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

/**
 * @program: hotelapp
 * @description:
 * @author: 张小辉
 * @create: 2022-05-31 09:39
 **/
@Log4j2
public class PdfConverUtil {

    /**
     //     * 获取license
     //     *
     //     * @return
     //     */
    private static boolean getLicense() {
        boolean result = false;
        try {
            // 凭证
            String licenseStr =
                    "<License>\n" +
                            "<Data>\n" +
                            "    <Products>\n" +
                            "        <Product>Aspose.Total for Java</Product>\n" +
                            "        <Product>Aspose.Excel for Java</Product>\n" +
                            "    </Products>\n" +
                            "    <EditionType>Enterprise</EditionType>\n" +
                            "    <SubscriptionExpiry>20991231</SubscriptionExpiry>\n" +
                            "    <LicenseExpiry>20991231</LicenseExpiry>\n" +
                            "    <SerialNumber>8bfe198c-7f0c-4ef8-8ff0-acc3237bf0d7</SerialNumber>\n" +
                            "</Data>\n" +
                            "<Signature>sNLLKGMUdF0r8O1kKilWAGdgfs2BvJb/2Xp8p5iuDVfZXmhppo+d0Ran1P9TKdjV4ABwAgKXxJ3jcQTqE/2IRfqwnPf8itN8aFZlV3TJPYeD3yWE7IT55Gz6EijUpC7aKeoohTb4w2fpox58wWoF3SNp6sK6jDfiAUGEHYJ9pjU=</Signature>\n" +
                            "</License>";
            InputStream license = new ByteArrayInputStream(licenseStr.getBytes("UTF-8"));
            License asposeLic = new License();
            asposeLic.setLicense(license);
            result = true;
        } catch (Exception e) {
            log.error("error:", e);
        }
        return result;
    }

    public static byte[] workbookToPdf(InputStream inputStream, ByteArrayOutputStream stream) {
        // 验证License 若不验证则转化出的pdf文档会有水印产生
        if (!getLicense()) {
            return null;
        }
        try {
            Workbook wb = new Workbook(inputStream);// 原始excel路径

            PdfSaveOptions pdfSaveOptions = new PdfSaveOptions();
            pdfSaveOptions.setOnePagePerSheet(false);

            int[] autoDrawSheets={3};
            //当excel中对应的sheet页宽度太大时，在PDF中会拆断并分页。此处等比缩放。
            autoDraw(wb,autoDrawSheets);

            int[] showSheets={0};
            //隐藏workbook中不需要的sheet页。
            printSheetPage(wb,showSheets);
            wb.save(stream, pdfSaveOptions);
            byte[] bytes = null;
            bytes = stream.toByteArray();
            System.out.println("pdf转换完毕......");
            return bytes;
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }


    /**
     * 设置打印的sheet 自动拉伸比例
     * @param wb
     * @param page 自动拉伸的页的sheet数组
     */
    public static void autoDraw(Workbook wb,int[] page){
        if(null!=page&&page.length>0){
            for (int i = 0; i < page.length; i++) {
                wb.getWorksheets().get(i).getHorizontalPageBreaks().clear();
                wb.getWorksheets().get(i).getVerticalPageBreaks().clear();
            }
        }
    }

    /**
     * 隐藏workbook中不需要的sheet页。
     *
     * @param wb
     * @param page 显示页的sheet数组
     */
    public static void printSheetPage(Workbook wb, int[] page) {
        for (int i = 1; i < wb.getWorksheets().getCount(); i++) {
            wb.getWorksheets().get(i).setVisible(false);
        }
        if (null == page || page.length == 0) {
            wb.getWorksheets().get(0).setVisible(true);
        } else {
            for (int i = 0; i < page.length; i++) {
                wb.getWorksheets().get(i).setVisible(true);
            }
        }
    }
}