摘要：先实现ppt转成图片，再转成pdf
1、maven依赖
<!--ppt转pdf-->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>4.1.1</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>4.1.1</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-scratchpad</artifactId>
<version>4.1.1</version>
</dependency>
<!--图片转pdf-->
<dependency>
<groupId>com.lowagie</groupId>
<artifactId>itext</artifactId>
<version>2.1.7</version>
</dependency>
2、java实现
if(fileName.endsWith("ppt")){
resObj = upload(file,flag);
FilesUtil f = new FilesUtil();
String pptPath = resObj.get("msg").toString();
String[] pptArr = pptPath.split(".ppt");
String arr = pptArr[0];
List<String> result = converPPTtoImage(pptPath, arr+"/", "jpg", 8);
resObj.put("msg",FILE_PATH + fileName.substring(0, fileName.lastIndexOf("."))+".pdf");
resObj.put("fileName",fileName.substring(0, fileName.lastIndexOf("."))+".pdf");
f.imageToPdf(result,FILE_PATH + fileName.substring(0, fileName.lastIndexOf("."))+".pdf");
}
/**
* 将PPT 文件转换成image
*
* @param orignalPPTFileName //PPT文件路径 如：d:/demo/demo1.ppt
* @param targetImageFileDir //转换后的图片保存路径 如：d:/demo/pptImg
* @param imageFormatNameString //图片转化的格式字符串 ，如："jpg"、"jpeg"、"bmp" "png" "gif" "tiff"
* @return 图片名列表
* 生成图片放大的倍数,倍数越高，清晰度越高
*/
@SuppressWarnings("resource")
public static List<String> converPPTtoImage(String orignalPPTFileName, String targetImageFileDir,
String imageFormatNameString, int times) {
List<String> imgList = new ArrayList<>();
List<String> imgNamesList = new ArrayList<String>();// PPT转成图片后所有名称集合
FileInputStream orignalPPTFileInputStream = null;
FileOutputStream orignalPPTFileOutStream = null;
HSLFSlideShow oneHSLFSlideShow = null;
//创建文件夹
createDirIfNotExist(targetImageFileDir);
try {
try {
orignalPPTFileInputStream = new FileInputStream(orignalPPTFileName);
} catch (FileNotFoundException e) {
e.printStackTrace();
return Collections.emptyList();
}
try {
oneHSLFSlideShow = new HSLFSlideShow(orignalPPTFileInputStream);
} catch (IOException e) {
e.printStackTrace();
return Collections.emptyList();
}
// 获取PPT每页的大小（宽和高度）
Dimension onePPTPageSize = oneHSLFSlideShow.getPageSize();
// 获得PPT文件中的所有的PPT页面（获得每一张幻灯片）,并转为一张张的播放片
List<HSLFSlide> pptPageSlideList = oneHSLFSlideShow.getSlides();
// 下面循环的主要功能是实现对PPT文件中的每一张幻灯片进行转换和操作
for (int i = 0; i < pptPageSlideList.size(); i++) {
// 这几个循环只要是设置字体为宋体，防止中文乱码，
List<List<HSLFTextParagraph>> oneTextParagraphs = pptPageSlideList.get(i).getTextParagraphs();
for (List<HSLFTextParagraph> list : oneTextParagraphs) {
for (HSLFTextParagraph hslfTextParagraph : list) {
List<HSLFTextRun> HSLFTextRunList = hslfTextParagraph.getTextRuns();
for (int j = 0; j < HSLFTextRunList.size(); j++) {
// 如果PPT在WPS中保存过，则
// HSLFTextRunList.get(j).getFontSize();的值为0或者26040，
// 因此首先识别当前文本框内的字体尺寸是否为0或者大于26040，则设置默认的字体尺寸。
// 设置字体大小
Double size = HSLFTextRunList.get(j).getFontSize();
if ((size <= 0) || (size >= 26040)) {
HSLFTextRunList.get(j).setFontSize(20.0);
}
// 设置字体样式为宋体
// String
// family=HSLFTextRunList.get(j).getFontFamily();
HSLFTextRunList.get(j).setFontFamily("宋体");
}
}
}
// 创建BufferedImage对象，图像的尺寸为原来的每页的尺寸*倍数times
BufferedImage oneBufferedImage = new BufferedImage(onePPTPageSize.width * times,
onePPTPageSize.height * times, BufferedImage.TYPE_INT_RGB);
Graphics2D oneGraphics2D = oneBufferedImage.createGraphics();
// 设置转换后的图片背景色为白色
oneGraphics2D.setPaint(Color.white);
oneGraphics2D.scale(times, times);// 将图片放大times倍
oneGraphics2D
.fill(new Rectangle2D.Float(0, 0, onePPTPageSize.width * times, onePPTPageSize.height * times));
pptPageSlideList.get(i).draw(oneGraphics2D);
// 设置图片的存放路径和图片格式，注意生成的图片路径为绝对路径，最终获得各个图像文件所对应的输出流对象
try {
String imgName = (i + 1) + "_" + UUID.randomUUID().toString() + "." + imageFormatNameString;
imgNamesList.add(imgName);// 将图片名称添加的集合中
imgList.add(targetImageFileDir+imgName);
orignalPPTFileOutStream = new FileOutputStream(targetImageFileDir + imgName);
} catch (FileNotFoundException e) {
e.printStackTrace();
return Collections.emptyList();
}
// 转换后的图片文件保存的指定的目录中
try {
ImageIO.write(oneBufferedImage, imageFormatNameString, orignalPPTFileOutStream);
} catch (IOException e) {
e.printStackTrace();
return Collections.emptyList();
}
}
} finally {
try {
if (orignalPPTFileInputStream != null) {
orignalPPTFileInputStream.close();
}
} catch (IOException e) {
e.printStackTrace();
}
try {
if (orignalPPTFileOutStream != null) {
orignalPPTFileOutStream.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return imgList;
}
/**
* 创建文件如果路径不存在则创建对应的文件夹
* @param file
* @return
*/
public static File createDirIfNotExist(String file) {
File fileDir = new File(file);
if (!fileDir.exists()) {
fileDir.mkdirs();
}
return fileDir;
}
public File imageToPdf(List<String> imageUrllist, String mOutputPdfFileName) {
Document doc = new Document(PageSize.A4, 20, 20, 20, 20);
try {
PdfWriter.getInstance(doc, new FileOutputStream(mOutputPdfFileName));
doc.open();
for (int i = 0; i < imageUrllist.size(); i++) {
doc.newPage();
Image png1 = Image.getInstance(imageUrllist.get(i));
float heigth = png1.getHeight();
float width = png1.getWidth();
int percent = getPercent2(heigth, width);
png1.setAlignment(Image.MIDDLE);
png1.scalePercent(percent + 3);// 表示是原来图像的比例;
doc.add(png1);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (DocumentException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally {
doc.close();
}
File mOutputPdfFile = new File(mOutputPdfFileName);
if (!mOutputPdfFile.exists()) {
mOutputPdfFile.deleteOnExit();
return null;
}
return mOutputPdfFile;
}
private int getPercent2(float h, float w) {
int p = 0;
float p2 = 0.0f;
p2 = 530 / w * 100;
p = Math.round(p2);
return p;
}
