本地图片转换为PDF
1.需要使用到pdfbox
需要添加如下依赖
<!-- https://mvnrepository.com/artifact/org.apache.pdfbox/pdfbox --><dependency><groupId>org.apache.pdfbox</groupId><artifactId>pdfbox</artifactId><version>2.0.25</version></dependency>
2.图片转PDF
直接上代码
/*** 合成PDF方法** @param folderPath 图片所在路径（最好都是英文）* @param outputPath pdf 输出路径* @throws IOException 抛出IO异常*/public static void createPDFFromFolder(String folderPath, String outputPath) throws IOException {File folder = new File(folderPath);// 可以添加其他的图片格式File[] files = folder.listFiles((dir, name) -> name.toLowerCase().endsWith(".jpg") || name.toLowerCase().endsWith(".png"));if (files == null) {throw new IOException("No files found in the specified folder.");}//根据文件名排序（此处可按需将比较规则重新设定）Arrays.sort(files, Comparator.comparing(File::getName));try (PDDocument document = new PDDocument()) {for (File file : files) {FileInputStream fileInputStream = new FileInputStream(file);ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();byte[] bytes = new byte[1024];byte[] result = null;int len;while ((len = fileInputStream.read(bytes)) != -1) {byteArrayOutputStream.write(bytes, 0, len);}result = byteArrayOutputStream.toByteArray();BufferedImage image = ImageIO.read(file);imageToPdf(document, result, image);}document.save(outputPath);}}
public static PDDocument imageToPdf(PDDocument document, byte[] result, BufferedImage image) throws IOException {if (image == null) {System.out.println("无法读取当前图片" );return document;}//设置为A4大小(可设置其他的大小)PDPage page = new PDPage(PDRectangle.A4);document.addPage(page);try (PDPageContentStream contentStream = new PDPageContentStream(document, page)) {float imageWidth = page.getMediaBox().getWidth();float imageHeight = page.getMediaBox().getHeight();// 确保图片按比例缩放以适合页面大小float scale = Math.min(imageWidth / image.getWidth(), imageHeight / image.getHeight());// 将图片画到PDF页面上，按比例缩放
// contentStream.drawImage(PDImageXObject.createFromFile(file.toString(), document),contentStream.drawImage(PDImageXObject.createFromByteArray(document, result,null),0, 0,image.getWidth() * scale, image.getHeight() * scale);}return document;}
)
)