Question

我有一张带有一页或多页A4纸的pdf文件。得到的pdf文档应该是A3纸，其中每页包含两个来自第一页（左边是奇数，甚至是右边）。我已经得到它将A4页面渲染成图像，并且奇数页面成功地放置在新A3页面的第一部分上，但我无法获得偶数页面。

public class CreateLandscapePDF {

public void renderPDF(File inputFile, String output) {
    PDDocument docIn = null;
    PDDocument docOut = null;
    float width = 0;
    float height = 0;
    float posX = 0;
    float posY = 0;
    try {
        docIn = PDDocument.load(inputFile);
        PDFRenderer pdfRenderer = new PDFRenderer(docIn);
        docOut = new PDDocument();
        int pageCounter = 0;
        for(PDPage pageIn : docIn.getPages()) {
            pageIn.setRotation(270);
            BufferedImage bufferedImage = pdfRenderer.renderImage(pageCounter);
            width = bufferedImage.getHeight();
            height = bufferedImage.getWidth();
            PDPage pageOut = new PDPage(PDRectangle.A3);
            PDImageXObject image = LosslessFactory.createFromImage(docOut, bufferedImage);
            PDPageContentStream contentStream = new PDPageContentStream(docOut, pageOut, AppendMode.APPEND, true, true);                
            if((pageCounter & 1) == 0) {
                pageOut.setRotation(90);
                docOut.addPage(pageOut);
                posX = 0;
                posY = 0;
            } else {
                posX = 0;
                posY = width;
            }
            contentStream.drawImage(image, posX, posY);
            contentStream.close();
            bufferedImage.flush();                
            pageCounter++;
        }
        docOut.save(output + "\\LandscapeTest.pdf");
        docOut.close();
        docIn.close();
    } catch(IOException io) {
        io.printStackTrace();
    }
}

}

我正在使用Apache PDFBox 2.0.2（pdfbox-app-2.0.2.jar）

Answer 1

非常感谢您的帮助以及其他问题的链接 - 我想我已经阅读过了，但我还没能在我的代码中使用它。但最终PDFClown完成了这项工作，尽管我认为在同一个程序中使用PDFBox和PDFClown并不是很好。无论如何，这是我在A3纸上组合A4页面的工作代码。

public class CombinePages {

public void run(String input, String output) {
    try {
        Document source = new File(input).getDocument();
        Pages sourcePages = source.getPages();

        Document target = new File().getDocument();
        Page targetPage = null;

        int pageCounter = 0;
        double moveByX = .0;
        for(Page sourcePage : source.getPages()) {

            if((pageCounter & 1) == 0) {
                //even page gets a blank page
                targetPage = new Page(target);
                target.setPageSize(PageFormat.getSize(PageFormat.SizeEnum.A3, PageFormat.OrientationEnum.Landscape));
                target.getPages().add(targetPage);
                moveByX = .0;
            } else {
                moveByX = .50;
            }

            //get content from source page
            XObject xObject = sourcePages.get(pageCounter).toXObject(target);
            PrimitiveComposer composer = new PrimitiveComposer(targetPage);
            Dimension2D targetSize = targetPage.getSize();
            Dimension2D sourceSize = xObject.getSize();
            composer.showXObject(xObject, new Point2D.Double(targetSize.getWidth() * moveByX, targetSize.getHeight() * .0), new Dimension(sourceSize.getWidth(), sourceSize.getHeight()), XAlignmentEnum.Left, YAlignmentEnum.Top, 0);
            composer.flush();
            pageCounter++;
        }
        target.getFile().save(output + "\\CombinePages.pdf", SerializationModeEnum.Standard);
        source.getFile().close();
    } catch (FileNotFoundException fnf) {
        log.error(fnf);
    } catch (IOException io) {
        log.error(io);
    }

}

}

PDFBox：在一张A3上放两张A4纸

1 个答案: