1、Aspose组件下载

Aspose下载地址：https://products.aspose.com/pdf/java

破解版下载地址：https://download.csdn.net/download/ahgaoyong/9615804

官方文档地址：https://docs.aspose.com/display/pdfjava/Home

官方Demo代码：https://github.com/aspose-pdf/Aspose.pdf-for-Java

2､多张图片转成pdf

1) 验证license

 /**
     * 获取license
     * 
     * @return
     */
    public static boolean getLicense() {
        boolean result = false;
        try {
            InputStream is = Test.class.getClassLoader().getResourceAsStream("\\license.xml");
            License aposeLic = new License();
            aposeLic.setLicense(is);
            result = true;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }

2) 实现代码

	public static void convertImageToPdf(ArrayList<String> inputImgPaths, String outputFileName) throws Exception {
		// Instantiate Document Object
		try {
			com.aspose.pdf.Document doc = new com.aspose.pdf.Document();
			for (int i = 0; i < inputImgPaths.size(); i++)
			//
			{
				// Add a page to pages collection of document
				Page page = doc.getPages().add();
				// Load the source image file to Stream object
				java.io.FileInputStream fs = new java.io.FileInputStream(inputImgPaths.get(i));
				// Set margins so image will fit, etc.
				page.getPageInfo().getMargin().setBottom(0);
				page.getPageInfo().getMargin().setTop(0);
				page.getPageInfo().getMargin().setLeft(0);
				page.getPageInfo().getMargin().setRight(0);
				page.setCropBox(new Rectangle(0, 0, 400, 400));
				// Create an image object
				Image image1 = new Image();
				// Add the image into paragraphs collection of the section
				page.getParagraphs().add(image1);
				// Set the image file stream
				image1.setImageStream(fs);
			}
			doc.save(outputFileName);
		} finally {
		}
	}

或者

	public static void convertImageToPdf(ArrayList<String> inputImgPaths, String outputFileName) throws Exception {
		// Instantiate Document Object
		try {
			com.aspose.pdf.Document doc = new com.aspose.pdf.Document();
			for (int i = 0; i < inputImgPaths.size(); i++) {
				// Add a page to pages collection of document
				Page page = doc.getPages().add();
				// create image instance
				Image image1 = new Image();
				// create BufferedImage instance
				java.awt.image.BufferedImage bufferedImage = ImageIO.read(new File(inputImgPaths.get(i)));
				ByteArrayOutputStream baos = new ByteArrayOutputStream();
				// write buffered Image to OutputStream instance
				ImageIO.write(bufferedImage, "gif", baos);
				baos.flush();
				ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
				// add image to paragraphs collection of first page
				page.getParagraphs().add(image1);
				// set image stream as OutputStream holding Buffered image
				image1.setImageStream(bais);
			}
			doc.save(outputFileName);
		} finally {
		}
	}

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