java实现ppt转图片、ppt转pdf

2024-03-07 01:02| 来源: 网络整理| 查看: 265

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

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