Java pdf转图片 或者 图片转pdf (pdfbox)(itext)

前言：图片转pdf的过程中，能不用**ImageIO.read()**方法就不用，这个方法读取图片会耗费大量时间，转pdf的时间尽量控制在1秒之内

提醒： 传进来的参数不一定要MultipartFile， 读取本地图片或者url（慢点）也可以达到这个速度，注释里有写读取本地图片或url方法的方法

读取url第一种方法:

org.apache.commons.io.FileUtils.toFile()

1. 导入依赖

	<dependency><groupId>org.apache.pdfbox</groupId><artifactId>fontbox</artifactId><version>2.0.12</version></dependency><dependency><groupId>org.apache.pdfbox</groupId><artifactId>pdfbox</artifactId><version>2.0.12</version></dependency><!-- https://mvnrepository.com/artifact/com.itextpdf/itextpdf --><dependency><groupId>com.itextpdf</groupId><artifactId>itextpdf</artifactId><version>5.5.5</version></dependency><dependency><groupId>com.itextpdf</groupId><artifactId>itext-asian</artifactId><version>5.2.0</version></dependency>

2. pdfbox方式

2.1. 图片转pdf

这里不一定要MultipartFile，就算是本地图片也可以PDImageXObject.createFromFile(imagePath, document);支持本地图片的读取

public static byte[] getPdfBytes(MultipartFile[] imagesFiles) throws IOException {PDDocument document = new PDDocument();for (MultipartFile datum : imagesFiles) {String filename = datum.getOriginalFilename();String fileSuffix = filename.substring(filename.lastIndexOf(".") + 1);Iterator readers = ImageIO.getImageReadersByFormatName(fileSuffix);ImageReader reader = (ImageReader) readers.next();ImageInputStream input = ImageIO.createImageInputStream(datum.getInputStream());reader.setInput(input, true);int width = reader.getWidth(0);int height = reader.getHeight(0);PDPage pdPage = new PDPage(new PDRectangle(width, height));document.addPage(pdPage);PDImageXObject pdImageXObject = PDImageXObject.createFromByteArray(document, datum.getBytes(), "构建图片错误");//如果没有文件的字节数组,也可以用下面这个//String imagePath = "/test";//PDImageXObject pdImageXObject = PDImageXObject.createFromFile(imagePath, document);//如果只有url，可以用hutool包的HttpUtil方法下载下来，得到的结果是字节数组，不过会耗时长PDPageContentStream contentStream = new PDPageContentStream(document, pdPage);//写入图片contentStream.drawImage(pdImageXObject, 0, 0);contentStream.close();}ByteArrayOutputStream output = new ByteArrayOutputStream();document.save(output);document.close();return output.toByteArray();}

2.2. pdf+ 图片转pdf

很简单直接将上面的PDDocument document = new PDDocument();换成//读取上传pdf文件PDDocument document = PDDocument.load(pdfFile.getInputStream()); //pdfFile也是MultipartFile，这里直接用需要读取pdf文件流就可以了下面的代码和上面的方法一样

2.3. pdf转图片

/*** @ Author     ：chl* @ Date       ：Created in 14:40 2023/3/1* @ Description：可以改成返回值为List* @param imageFolderPath 存放图片文件路径* @param pdfSourcePath 需要读取的pdf路径* @param dpi 这个越大，图片越清晰，300挺清楚了* @param formatName* @ return void*/public static void loadPdf2Image(String imageFolderPath, String pdfSourcePath, int dpi, String formatName) throws Exception {PDDocument document = PDDocument.load(new File(pdfSourcePath));PDFRenderer renderer = new PDFRenderer(document);for (int i = 0; i < document.getNumberOfPages(); i++) {BufferedImage bufferedImage = renderer.renderImageWithDPI(i, dpi);String imagePath = imageFolderPath + i + "." + formatName;FileOutputStream fileOutputStream = new FileOutputStream(imagePath);ImageIO.write(bufferedImage, formatName, fileOutputStream);}document.close();}

3、itext 方式

3.1. 图片转pdf

/*** @ Author     ：chl* @ Date       ：Created in 11:08 2023/3/2* @ Description：性能翻倍* @param data* @ return byte[]*/public static byte[] multipartFile2pdf2(MultipartFile[] data) {Document document = new Document();ByteArrayOutputStream bos = new ByteArrayOutputStream();try {PdfWriter.getInstance(document, bos);document.open();for (MultipartFile datum : data) {Image image = null;ImageInputStream input = null;int width = 0;int height = 0;try {String filename = datum.getOriginalFilename();String fileSuffix = filename.substring(filename.lastIndexOf(".") + 1);Iterator readers = ImageIO.getImageReadersByFormatName(fileSuffix);ImageReader reader = (ImageReader) readers.next();input = ImageIO.createImageInputStream(datum.getInputStream());reader.setInput(input, true);width = reader.getWidth(0);height = reader.getHeight(0);//加载图片image = Image.getInstance(datum.getBytes());//如果不能直接得到图片字节数组，可以直接，不用再用FileOutputStream读了//image = Image.getInstance(filePath);//居中image.setAlignment(Image.MIDDLE);} catch (BaseException e) {throw new BaseException("加载上传图片错误");}//页面大小是图片大小, 和newPage位置不能对调，否则生成烂图document.setPageSize(new Rectangle(width, height));document.newPage();document.add(image);input.close();}document.close();} catch (BaseException be) {throw new BaseException("加载上传图片错误");} catch (Exception e) {e.printStackTrace();}return bos.toByteArray();}

3.2. 图片+pdf 转成pdf

public static byte[] pdfAndImage2Pdf(MultipartFile pdfFile, MultipartFile[] imagesFiles) throws IOException {PdfReader pdfReader = null;ByteArrayOutputStream bos = new ByteArrayOutputStream();PdfStamper pdfStamper = null;try {//load pdfpdfReader = new PdfReader(pdfFile.getBytes());//打开pdf编辑器pdfStamper = new PdfStamper(pdfReader, bos);for (MultipartFile datum : imagesFiles) {String filename = datum.getOriginalFilename();String fileSuffix = filename.substring(filename.lastIndexOf(".") + 1);Iterator readers = ImageIO.getImageReadersByFormatName(fileSuffix);ImageReader reader = (ImageReader) readers.next();ImageInputStream input = ImageIO.createImageInputStream(datum.getInputStream());reader.setInput(input, true);int width = reader.getWidth(0);int height = reader.getHeight(0);Image image = Image.getInstance(datum.getBytes());image.setAlignment(Image.MIDDLE);//添加空白页pdfStamper.insertPage(pdfReader.getNumberOfPages() + 1, new Rectangle(width, height));//捕获空白页PdfContentByte overContent = pdfStamper.getOverContent(pdfReader.getNumberOfPages());image.scaleAbsolute(width, height);//设置绝对位置image.setAbsolutePosition(0, 0);overContent.addImage(image);input.close();}}catch (Exception e) {e.printStackTrace();} finally {try {pdfStamper.close();pdfReader.close();} catch (Exception e) {e.printStackTrace();}}return bos.toByteArray();}

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