本文主要介绍Java中,使用aspose.words将一张多帧图片,也就是一个图片中包含多张图片,转成pdf文件,就是每张一个页。以及转换示例代码。

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、将多帧图片转成pdf

 /**
     * 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;
    }
public static void convertImageToPdf(String inputFileName, String outputFileName) throws Exception
	{
                // 验证License
               if (!getLicense()) {
                 return;
               }
		// 创建 Aspose.Words.Document 和 DocumentBuilder.
		// 构建器使向文档添加内容变得很简单。
		Document doc = new Document();
		DocumentBuilder builder = new DocumentBuilder(doc);
		// 使用approriate读取器从磁盘加载图像。
		ImageInputStream iis = ImageIO.createImageInputStream(new File(inputFileName));
		ImageReader reader = ImageIO.getImageReaders(iis).next();
		reader.setInput(iis, false);
		try
		{
			// 获取图像中的帧数。
			int framesCount = reader.getNumImages(true);
			// 遍历所有帧。
			for (int frameIdx = 0; frameIdx < framesCount; frameIdx++)
			{
				// 如果是多帧图像,则在每个新页面之前插入分段。
				if (frameIdx != 0)
			       builder.insertBreak(BreakType.SECTION_BREAK_NEW_PAGE);	
				BufferedImage image = reader.read(frameIdx);
				// Max page size
				double maxPageHeight = 1584;
				double maxPageWidth = 1584;
				double currentImageHeight = ConvertUtil.pixelToPoint(image.getHeight());
				double currentImageWidth = ConvertUtil.pixelToPoint(image.getWidth());
				if (currentImageWidth >= maxPageWidth || currentImageHeight >= maxPageHeight)
				{
					// Get max image size.
					double[] size = CalculateImageSize(image, maxPageHeight, maxPageWidth, currentImageHeight,
							currentImageWidth);
					currentImageWidth = size[0];
					currentImageHeight = size[1];
				}
                              //我们希望页面的大小与图像的大小相同。
                              //将像素转换为点,将页面大小转换为实际图像大小。
				PageSetup ps = builder.getPageSetup();
				ps.setPageWidth(currentImageWidth);
				ps.setPageHeight(currentImageHeight);
				//  将图像插入到文档中,并将其定位到的左上角该页面。
				Shape shape = builder.insertImage(
						image,
						RelativeHorizontalPosition.PAGE,
						0,
						RelativeVerticalPosition.PAGE,
						0,
						ps.getPageWidth(),
						ps.getPageHeight(),
						WrapType.NONE);
			}
		}
		finally {
			if (iis != null) {
				iis.close();
				reader.dispose();
			}
		}
		// 将文档保存为PDF
		doc.save(outputFileName);
	}
	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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