1、Aspose组件下载

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

破解版下载地址：https://download.csdn.net/download/ahgaoyong/9615854

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

官方Demo代码：https://github.com/aspose-words/Aspose.Words-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) 多图片转成pdf

     public static void convertImageToPdf(ArrayList<String> inputImgPaths, String outputFileName) throws Exception
	{
                // 验证License
                if (!getLicense()) {
                  return; 
                }
		Document doc = new Document();
		DocumentBuilder builder = new DocumentBuilder(doc);
		try
		{
			for (int i = 0; i < inputImgPaths.size(); i++)
			{
				if (i != 0)
					builder.insertBreak(BreakType.SECTION_BREAK_NEW_PAGE);
				File file = new File(inputImgPaths.get(i));// 本地图片
				BufferedImage image = (BufferedImage) ImageIO.read(file);
				double maxPageHeight = 1584;
				double maxPageWidth = 1584;
				double currentImageHeight = ConvertUtil.pixelToPoint(image.getHeight());
				double currentImageWidth = ConvertUtil.pixelToPoint(image.getWidth());
				if (currentImageWidth >= maxPageWidth || currentImageHeight >= maxPageHeight)
				{
					double[] size = CalculateImageSize(image, maxPageHeight, maxPageWidth, currentImageHeight,
							currentImageWidth);
					currentImageWidth = size[0];
					currentImageHeight = size[1];
				}
				PageSetup ps = builder.getPageSetup();
				ps.setPageWidth(currentImageWidth);
				ps.setPageHeight(currentImageHeight);
				Shape shape = builder.insertImage(
						image,
						RelativeHorizontalPosition.PAGE,
						0,
						RelativeVerticalPosition.PAGE,
						0,
						ps.getPageWidth(),
						ps.getPageHeight(),
						WrapType.NONE);
			}
		}
		finally {
		}
		// Save the document to PDF.
		doc.save(outputFileName);
	}

        // 等比计算图片尺寸
	public static double[] CalculateImageSize(BufferedImage img, double containerHeight, double containerWidth,
			double targetHeight, double targetWidth) throws Exception {
		// Calculate width and height
		targetHeight = containerHeight;
		targetWidth = containerWidth;
	// Get size of an image
		double imgHeight = ConvertUtil.pixelToPoint(img.getHeight());
		double imgWidth = ConvertUtil.pixelToPoint(img.getWidth());
		if (imgHeight < targetHeight && imgWidth < targetWidth)
		{
			targetHeight = imgHeight;
			targetWidth = imgWidth;
		}
		else
		{
			// 计算文档中图像的大小
			double ratioWidth = imgWidth / targetWidth;
			double ratioHeight = imgHeight / targetHeight;
			if (ratioWidth > ratioHeight)
				targetHeight = (targetHeight * (ratioHeight / ratioWidth));
			else
				targetWidth = (targetWidth * (ratioWidth / ratioHeight));
		}
		double[] size = new double[2];
		size[0] = targetWidth; // width
		size[1] = targetHeight; // height
		return (size);
	}

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