java实现ppt转图片、ppt转pdf

        最近做的需求需要实现在线预览ppt的功能，网上查了一遍，比较完美的方案都需要依赖第三方的服务或调用微软的在线接口，由于项目部署内网，同时为了不增加项目的复杂度，最终决定使用纯java实现，依赖 poi 将ppt 转成 png图片，然后再利用 itextpdf 将图片转成 pdf ，最后通过js实现预览。转换后的pdf效果图如下：

        目前存在一个确定是 ppt字体全部统一换成了 宋体 ，以解决中文有些情况下乱码的问题，本来想研究下能不更换字体的方式，但是没时间，暂时就这样了。有解决方案的同学还请赐教。

        下面直接上代码：

        maven 依赖大致如下：

        
        
            org.apache.poi
            poi-ooxml
        
        
            org.apache.poi
            poi-scratchpad
            4.1.0
        

        
            org.apache.poi
            poi-ooxml-schemas
            4.1.0
        

        
            org.apache.poi
            ooxml-schemas
            1.4
        

        
            fr.opensagres.xdocreport
            xdocreport
            2.0.2
        
        
        
            com.itextpdf
            itextpdf
            5.5.13.1
        
        
            org.apache.pdfbox
            fontbox
            2.0.18
        
        
            org.apache.pdfbox
            pdfbox
            2.0.18
        
        
            com.itextpdf
            itext-asian
            5.2.0
        
        
            org.apache.xmlgraphics
            batik-bridge
            1.12
        
        
        
            net.coobird
            thumbnailator
            0.4.8
        

        

 java 工具类

package com.fmi110.common.utils;

import com.itextpdf.text.BadElementException;
import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.pdf.PdfWriter;
import com.ruoyi.common.exception.BusinessException;
import org.apache.commons.io.IOUtils;
import org.apache.pdfbox.multipdf.PDFMergerUtility;
import org.apache.poi.hslf.usermodel.*;
import org.apache.poi.xslf.usermodel.*;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.util.CollectionUtils;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.color.ColorSpace;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.awt.image.ColorConvertOp;
import java.io.*;
import java.util.ArrayList;
import java.util.List;

/**
 * @author fmi110
 * @description ppt 转图片；图片转pdf 工具
 * @date 2021/8/19 20:16
 */

public class PPTUtil {
    protected static final Logger log = LoggerFactory.getLogger(PPTUtil.class);

    public static int width  = 720;
    public static int height = 540;

    public static void PPTtoImage(String filePath, String fileName) throws Exception {
        File f = new File(filePath + fileName);
        if (f.exists()) {
            if (f.getName().endsWith(".pptx") || f.getName().endsWith(".PPTX")) {
                pptx2Image(filePath, fileName);
            } else {
                ppt2Image(filePath, fileName);
            }
        } else {
            throw new BusinessException("文档不存在");
        }
    }

    /**
     * 将pptx转换为图片,直接保存在内存中,ppt很大时可能会oom!!!
     *
     * @param is ppt 输入流
     * @return
     * @throws IOException
     */
    public static List pptx2Image(InputStream is) throws IOException {
        // 获取系统可用字体
        GraphicsEnvironment e          = GraphicsEnvironment.getLocalGraphicsEnvironment();
        String[]            fontNames  = e.getAvailableFontFamilyNames();
        List                availFonts = CollectionUtils.arrayToList(fontNames);

        XMLSlideShow ppt      = new XMLSlideShow(is);
        Dimension    pgsize   = ppt.getPageSize();
        int          pageSize = ppt.getSlides().size();
        List imgList  = new ArrayList<>(pageSize);

        log.info("ppt 总页数：{}， 尺寸: width={},height={}", pageSize, pgsize.width, pgsize.height);

        for (int i = 0; i < pageSize; i++) {
            //防止中文乱码
            for (XSLFShape shape : ppt.getSlides().get(i).getShapes()) {
                if (shape instanceof XSLFTextShape) {
                    XSLFTextShape tsh = (XSLFTextShape) shape;
                    for (XSLFTextParagraph p : tsh) {
                        for (XSLFTextRun r : p) {
                            String fontFamily = r.getFontFamily();
                            //log.info(">>>>>原始ppt字体：{}", fontFamily);
                            fontFamily = "宋体";
                            //log.info(">>>>>ppt字体修改为：{}", fontFamily);
                            r.setFontFamily(fontFamily);
//                            if (!availFonts.contains(fontFamily)) {
//                                fontFamily = "宋体";
//                                log.info(">>>>>ppt字体修改为：{}", fontFamily);
//                                r.setFontFamily(fontFamily);
//                            }
                        }
                    }
                }
            }
            BufferedImage img      = new BufferedImage(pgsize.width, pgsize.height, BufferedImage.TYPE_INT_RGB);
            Graphics2D    graphics = img.createGraphics();
            // clear the drawing area
            graphics.setPaint(Color.white);
            graphics.fill(new Rectangle2D.Float(0, 0, pgsize.width, pgsize.height));
            // render
            ppt.getSlides().get(i).draw(graphics);
            // save the output
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            javax.imageio.ImageIO.write(img, "png", out);
            imgList.add(out.toByteArray());
            IOUtils.closeQuietly(out);
        }
        if (is != null) {
            IOUtils.closeQuietly(is);
        }
        return imgList;
    }

    /**
     * 将pptx转成图片,保存在同一目录的image目录下
     *
     * @param filePath ppt文件路径
     * @param fileName ppt 文件名
     * @throws IOException
     */
    public static void pptx2Image(String filePath, String fileName) throws Exception {

        // 获取系统可用字体
        GraphicsEnvironment e          = GraphicsEnvironment.getLocalGraphicsEnvironment();
        String[]            fontNames  = e.getAvailableFontFamilyNames();
        List                availFonts = CollectionUtils.arrayToList(fontNames);

        FileInputStream is  = new FileInputStream(filePath + fileName);
        XMLSlideShow    ppt = new XMLSlideShow(is);

        Dimension pgsize   = ppt.getPageSize();
        int       pageSize = ppt.getSlides().size();
        log.info("ppt 总页数：{}， 尺寸: width={},height={}", pageSize, pgsize.width, pgsize.height);

        for (int i = 0; i < pageSize; i++) {

            //防止中文乱码
            for (XSLFShape shape : ppt.getSlides().get(i).getShapes()) {
                if (shape instanceof XSLFTextShape) {
                    XSLFTextShape tsh = (XSLFTextShape) shape;
                    for (XSLFTextParagraph p : tsh) {
                        for (XSLFTextRun r : p) {
                            String fontFamily = r.getFontFamily();
                            //log.info(">>>>>原始ppt字体：{}", fontFamily);
                            fontFamily = "宋体";
                            //log.info(">>>>>ppt字体修改为：{}", fontFamily);
                            r.setFontFamily(fontFamily);
//                            if (!availFonts.contains(fontFamily)) {
//                                fontFamily = "宋体";
//                                log.info(">>>>>ppt字体修改为：{}", fontFamily);
//                                r.setFontFamily(fontFamily);
//                            }
                        }
                    }
                }
            }
            BufferedImage img      = new BufferedImage(pgsize.width, pgsize.height, BufferedImage.TYPE_INT_RGB);
            Graphics2D    graphics = img.createGraphics();
            // clear the drawing area
            graphics.setPaint(Color.white);
            graphics.fill(new Rectangle2D.Float(0, 0, pgsize.width, pgsize.height));
            // render
            ppt.getSlides().get(i).draw(graphics);
            // save the output
            String pptname    = fileName.substring(0, fileName.lastIndexOf("."));
            String newimgPath = filePath + "image/" + pptname + "/";
            File   imgPath    = new File(newimgPath);
            if (!imgPath.exists()) {//图片目录不存在则创建
                imgPath.mkdirs();
            }
            String           file = newimgPath + (i + 1) + ".png";
            FileOutputStream out  = new FileOutputStream(file);
            javax.imageio.ImageIO.write(img, "png", out);
            IOUtils.closeQuietly(out);
        }
        if (is != null) {
            IOUtils.closeQuietly(is);
        }
    }

    /**
     * 将ppt转换为图片,直接保存在内存中,ppt很大时可能会oom!!!
     *
     * @param is ppt 输入流
     * @return
     * @throws IOException
     */
    public static List ppt2Image(InputStream is) throws IOException {
        // 获取系统可用字体
        GraphicsEnvironment e          = GraphicsEnvironment.getLocalGraphicsEnvironment();
        String[]            fontNames  = e.getAvailableFontFamilyNames();
        List                availFonts = CollectionUtils.arrayToList(fontNames);

        HSLFSlideShow ppt      = new HSLFSlideShow(new HSLFSlideShowImpl(is));
        Dimension     pgsize   = ppt.getPageSize();
        int           pageSize = ppt.getSlides().size();
        List  imgList  = new ArrayList<>(pageSize);

        log.info("ppt 总页数：{}， 尺寸: width={},height={}", pageSize, pgsize.width, pgsize.height);

        for (int i = 0; i < pageSize; i++) {
            //防止中文乱码
            for (HSLFShape shape : ppt.getSlides().get(i).getShapes()) {
                if (shape instanceof HSLFTextShape) {
                    HSLFTextShape tsh = (HSLFTextShape) shape;
                    for (HSLFTextParagraph p : tsh) {
                        for (HSLFTextRun r : p) {
                            String fontFamily = r.getFontFamily();
                            //log.info(">>>>>原始ppt字体：{}", fontFamily);
                            fontFamily = "宋体";
                            //log.info(">>>>>ppt字体修改为：{}", fontFamily);
                            r.setFontFamily(fontFamily);
//                            if (!availFonts.contains(fontFamily)) {
//                                fontFamily = "宋体";
//                                log.info(">>>>>ppt字体修改为：{}", fontFamily);
//                                r.setFontFamily(fontFamily);
//                            }
                        }
                    }
                }
            }
            BufferedImage img      = new BufferedImage(pgsize.width, pgsize.height, BufferedImage.TYPE_INT_RGB);
            Graphics2D    graphics = img.createGraphics();
            // clear the drawing area
            graphics.setPaint(Color.white);
            graphics.fill(new Rectangle2D.Float(0, 0, pgsize.width, pgsize.height));
            // render
            ppt.getSlides().get(i).draw(graphics);
            // save the output
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            javax.imageio.ImageIO.write(img, "png", out);
            imgList.add(out.toByteArray());
            IOUtils.closeQuietly(out);
        }
        if (is != null) {
            IOUtils.closeQuietly(is);
        }
        return imgList;
    }

    /**
     * 将ppt转成图片,保存在同一目录的image目录下
     *
     * @param filePath ppt文件路径
     * @param fileName ppt 文件名
     * @throws IOException
     */
    public static void ppt2Image(String filePath, String fileName) throws IOException {
        // 获取系统可用字体
        GraphicsEnvironment e          = GraphicsEnvironment.getLocalGraphicsEnvironment();
        String[]            fontNames  = e.getAvailableFontFamilyNames();
        List                availFonts = CollectionUtils.arrayToList(fontNames);

        HSLFSlideShow ppt = new HSLFSlideShow(new HSLFSlideShowImpl(filePath + fileName));

        Dimension pgsize = ppt.getPageSize();
        for (int i = 0; i < ppt.getSlides().size(); i++) {
            //防止中文乱码
            for (HSLFShape shape : ppt.getSlides().get(i).getShapes()) {
                if (shape instanceof HSLFTextShape) {
                    HSLFTextShape tsh = (HSLFTextShape) shape;
                    for (HSLFTextParagraph p : tsh) {
                        for (HSLFTextRun r : p) {
                            String fontFamily = r.getFontFamily();
                            //log.info(">>>>>原始ppt字体：{}", fontFamily);
                            fontFamily = "宋体";
                            //log.info(">>>>>ppt字体修改为：{}", fontFamily);
                            r.setFontFamily(fontFamily);
//                            if (!availFonts.contains(fontFamily)) {
//                                fontFamily = "宋体";
//                                log.info(">>>>>ppt字体修改为：{}", fontFamily);
//                                r.setFontFamily(fontFamily);
//                            }

                        }
                    }
                }
            }
            BufferedImage img      = new BufferedImage(pgsize.width, pgsize.height, BufferedImage.TYPE_INT_RGB);
            Graphics2D    graphics = img.createGraphics();
            // clear the drawing area
            graphics.setPaint(Color.white);
            graphics.fill(new Rectangle2D.Float(0, 0, pgsize.width, pgsize.height));
            // render
            ppt.getSlides().get(i).draw(graphics);

            // save the output
            String pptname    = fileName.substring(0, fileName.lastIndexOf("."));
            String newimgPath = filePath + "image/" + pptname + "/";
            File   imgPath    = new File(newimgPath);
            if (!imgPath.exists()) {//图片目录不存在则创建
                imgPath.mkdirs();
            }
            String           file = newimgPath + (i + 1) + ".png";
            FileOutputStream out  = new FileOutputStream(file);
            javax.imageio.ImageIO.write(img, "png", out);
            IOUtils.closeQuietly(out);
            //resizeImage(filename, filename, width, height);
        }

    }

    /***
     * 功能 :调整图片大小
     * @param srcImgPath 原图片路径
     * @param distImgPath  转换大小后图片路径
     * @param width   转换后图片宽度
     * @param height  转换后图片高度
     */
    public static void resizeImage(String srcImgPath, String distImgPath,
                                   int width, int height) throws IOException {
        File          srcFile = new File(srcImgPath);
        Image         srcImg  = ImageIO.read(srcFile);
        BufferedImage buffImg = null;
        buffImg = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        buffImg.getGraphics().drawImage(
                srcImg.getScaledInstance(width, height, Image.SCALE_SMOOTH), 0,
                0, null);
        ImageIO.write(buffImg, "JPEG", new File(distImgPath));
    }

    /**
     * 将图片转换成pdf
     *
     * @return
     * @throws Exception
     */
    public static byte[] img2PDF(List images) throws Exception {

//        Document              doc    = new Document();
//        Document doc = new Document(PageSize.A4, 0, 0, 36.0F, 36.0F);//普通a4
        com.itextpdf.text.Rectangle pageSize = new com.itextpdf.text.Rectangle(0, 0, width, height); // 自定义页面大小
        Document                    doc      = new Document(pageSize, 0, 0, 0, 0);
        log.info(">>>>A4尺寸：width={}，height={}", pageSize.getWidth(), pageSize.getHeight());
        ByteArrayOutputStream pdfOut = new ByteArrayOutputStream();
        PdfWriter.getInstance(doc, pdfOut);
        doc.open();
        float scale = pageSize.getWidth() / width;
        for (byte[] image : images) {
            com.itextpdf.text.Image pic = com.itextpdf.text.Image.getInstance(image);
            pic.setScaleToFitLineWhenOverflow(true);
            // pic.scaleAbsolute(width, height);
            pic.scaleToFit(pageSize.getWidth(), height * scale);
            doc.add(pic);
        }

        doc.close();
        byte[] pdf = pdfOut.toByteArray();
        IOUtils.closeQuietly(pdfOut);
        return pdf;
    }

    /**
     * ppt转化为pdf
     * @param is ppt 输入流
     * @return pdf 字节文件
     * @throws Exception
     */
    public static byte[] ppt2PDF(InputStream is) throws Exception {
        return img2PDF(ppt2Image(is));
    }
    /**
     * pptx转化为pdf
     * @param is pptx 输入流
     * @return pdf 字节文件
     * @throws Exception
     */
    public static byte[] pptx2PDF(InputStream is) throws Exception {
        return img2PDF(pptx2Image(is));
    }

    /**
     * 图片转pdf
     *
     * @param img
     * @param descfolder
     * @return
     * @throws Exception
     */
    public static String img2PDF(String imagePath, BufferedImage img, String descfolder) throws Exception {
        String pdfPath = "";
        try {
            //图片操作
            com.itextpdf.text.Image image = null;
            File                    file  = new File(descfolder);

            if (!file.exists()) {
                file.mkdirs();
            }

            pdfPath = descfolder + "/" + System.currentTimeMillis() + ".pdf";
            String   type = imagePath.substring(imagePath.lastIndexOf(".") + 1);
            Document doc  = new Document(null, 0, 0, 0, 0);

            //更换图片图层
            BufferedImage bufferedImage = new BufferedImage(img.getWidth(), img.getHeight(), BufferedImage.TYPE_3BYTE_BGR);
            bufferedImage.getGraphics().drawImage(img, 0, 0, img.getWidth(), img.getHeight(), null);
            bufferedImage = new ColorConvertOp(ColorSpace.getInstance(ColorSpace.CS_LINEAR_RGB), null).filter(bufferedImage, null);

            //图片流处理
            doc.setPageSize(new com.itextpdf.text.Rectangle(bufferedImage.getWidth(), bufferedImage.getHeight()));
            log.info(bufferedImage.getWidth() + "()()()()()" + bufferedImage.getHeight());
            ByteArrayOutputStream out  = new ByteArrayOutputStream();
            boolean               flag = ImageIO.write(bufferedImage, type, out);
            byte[]                b    = out.toByteArray();
            image = com.itextpdf.text.Image.getInstance(b);

            //写入PDF
            log.info("写入PDf:" + pdfPath);
            FileOutputStream fos = new FileOutputStream(pdfPath);
            PdfWriter.getInstance(doc, fos);
            doc.open();
            doc.add(image);
            doc.close();

        } catch (IOException e) {
            e.printStackTrace();
        } catch (BadElementException e) {
            e.printStackTrace();
        } catch (DocumentException e) {
            e.printStackTrace();
        }
        return pdfPath;
    }

    public static void mergePDF(String[] files, String desfolder, String mergeFileName) throws Exception {

        PDFMergerUtility mergePdf = new PDFMergerUtility();

        for (String file : files) {
            if (file.toLowerCase().endsWith("pdf"))
                mergePdf.addSource(file);
        }

        mergePdf.setDestinationFileName(desfolder + "/" + mergeFileName);
        mergePdf.mergeDocuments();
        log.info("merge over");

    }

    public static void main(String[] args) throws Exception {
        // 读入PPT文件
        String filePath = "D:/test/";
        String fileName = "docker.pptx";

        List images = pptx2Image(new FileInputStream(new File(filePath + fileName)));
        // 输出图片
        for (int i = 1; i <= images.size(); i++) {
            String path = filePath + i + ".png";
            FileOutputStream output = new FileOutputStream(path);
            IOUtils.write(images.get(i-1), output);
            IOUtils.closeQuietly(output);
        }

        // 输出pdf
        byte[]           pdf = pptx2PDF(new FileInputStream(new File(filePath + fileName)));
        FileOutputStream out = new FileOutputStream("D:/test/docker.pdf");
        IOUtils.write(pdf, out);
        IOUtils.closeQuietly(out);

    }

}

执行工具类main函数后测试的效果：

参考文章：

https://blog.csdn.net/huoji555/article/details/88339039

https://www.cnblogs.com/chenpi/p/5534595.html

https://zhanglf.blog.csdn.net/article/details/106853803?utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7Edefault-18.control&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7EBlogCommendFromBaidu%7Edefault-18.control