Question

我想将一些图像转换为PDDocument对象，而不是保存到硬件。如何从此PDDocument对象获取输入流？我写了一个打击，得到“创建InputStream调用没有数据被写入之前流。”错误。

源的部分是：

public ByteArrayOutputStream imagesToPdf(final List<ImageEntity> images) throws IOException {

    final PDDocument doc = new PDDocument();

    final int count = images.size();
    InputStream in = null;
    PDPageContentStream contentStream = null;
    final ByteArrayOutputStream baos = new ByteArrayOutputStream();
    try {

        for(int i = 0; i < count; i ++) {

            final ImageEntity image = images.get(i);

            byte[] byteCode = image.getByteCode();

            in = new ByteArrayInputStream(byteCode);

            BufferedImage bi = ImageIO.read(in);
            float width = bi.getWidth();
            float height = bi.getHeight();
            PDPage page = new PDPage(new PDRectangle(width, height));
            doc.addPage(page); 

            PDImageXObject pdImage = PDImageXObject.createFromByteArray(doc, byteCode, null);
            contentStream = new PDPageContentStream(doc, page, AppendMode.APPEND, true, true);

            float scale = 1f;
            contentStream.drawImage(pdImage, 0, 0, pdImage.getWidth()*scale, pdImage.getHeight()*scale);

            IOUtils.closeQuietly(contentStream);
            IOUtils.closeQuietly(in);
        }
        PDStream ps = new PDStream(doc);
        is = ps.createInputStream();
        IOUtils.copy(is, baos);
        return baos;

    } finally {

        IOUtils.closeQuietly(contentStream);
        IOUtils.closeQuietly(in);
    }
}

Answer 1

new PDStream(doc)

不创建一个对象，从中可以按照您的序列化形式检索doc。它实际上做的是创建属于文档doc的PDF流对象。

您想要做的只是

doc.save(baos);

pdfbox将图像转换为pdf文件

1 个答案: