pdfbox无法正确呈现修改后的pdf文件

Question

我正在使用"pdfbox-app-2.0.0-RC2.jar"

我创建了一个类，它缩小了pdf内容，并在指定的坐标处创建了带有此内容的新pdf。

我的问题是，如果一个pdf文件被修改并添加了新内容，那么缩小后的文件中就会缺少这些内容。

以下是我的方法：

public static String scaleInputPdf(String sourceFileName, float xpos,
        float ypos, float imgCtrlWidth, float imgCtrlHeight,
        PDRectangle pageSize) throws IOException {

    String workdir = "/tmp";

    File tmpDir = new File(workdir);
    if(! tmpDir.exists()) {
        tmpDir.mkdir();
    }

    String destPath = workdir + "/Result.pdf";

    PDDocument sourceDoc = null;
    try {
        // load the source PDF
        sourceDoc = PDDocument.load(new File(sourceFileName));

        // create a new PDF and add a blank page
        PDDocument doc = new PDDocument();

        for (int sourcePageNo = 0; sourcePageNo < sourceDoc
                .getNumberOfPages(); sourcePageNo++) {

            PDPage page = new PDPage();
            page.setMediaBox(pageSize);

            doc.addPage(page);

            PDPage currentSourcePage = sourceDoc.getPage(sourcePageNo);

            PDPageContentStream contents = new PDPageContentStream(doc,
                    page, true, true, true);

            float scaleFactor = getScalingFactor(currentSourcePage,
                    imgCtrlWidth, imgCtrlHeight, pageSize);

            PDFormXObject form = null;

            // Create a Form XObject from the source document using
            // LayerUtility
            LayerUtility layerUtility = new LayerUtility(doc);
            form = layerUtility.importPageAsForm(sourceDoc,
                    sourcePageNo);

            // draw a scaled form
            contents.saveGraphicsState();

            Matrix scalingMatrix = Matrix.getScaleInstance(scaleFactor,
                    scaleFactor);
            contents.transform(scalingMatrix);

            Matrix translatingMatrix = Matrix.getTranslateInstance(
                    xpos,
                    getYPosition(currentSourcePage, pageSize, ypos,
                            scaleFactor));
            contents.transform(translatingMatrix);

            contents.drawForm(form);

            contents.restoreGraphicsState();
            contents.close();

        }
        doc.save(destPath);
        doc.close();

    } catch (IOException ioe) {
        ioe.printStackTrace();
    } finally {
        if (sourceDoc != null) {
            sourceDoc.close();

        }
    }
    System.err.println("Done! /n file is at following location=" +destPath);
    return destPath;

}

private static float getScalingFactor(PDPage sourcePage,
        float imgCtrlWidth, float imgCtrlHeight, PDRectangle pageSize) {

    PDRectangle imageSize = sourcePage.getMediaBox();

    if (imageSize.getHeight() > 792) {

        if (pageSize.equals(PDRectangle.LETTER)) {
            imgCtrlWidth = 838.8f; // 932 * 0.90
            imgCtrlHeight = 1018f; // 1132 *0.90
        } else if (pageSize.equals(PDRectangle.A4)) {
            imgCtrlWidth = 819f; // 910 * 0.90
            imgCtrlHeight = 972f; // 1080 * 0.90
        }
    }

    float scaleX = imgCtrlWidth / imageSize.getWidth();

    float scaleY = imgCtrlHeight / imageSize.getHeight();

    float scaleFactor = ((scaleX < scaleY) ? scaleX : scaleY);

    if (imageSize.getHeight() > 792 && scaleFactor > 0.88) {
        scaleFactor = 0.88f;
    }

    return scaleFactor;
}

private static float getYPosition(PDPage sourcePage,
        PDRectangle finalDocPageSize, float yMarginPos, float scaleFactor) {

    float yPos = yMarginPos;

    float imgHeight = sourcePage.getMediaBox().getHeight();

    PDRectangle cropBox = sourcePage.getCropBox();

    if (imgHeight > 792) {

        if (cropBox.getLowerLeftY() != 0) {

            yPos = cropBox.getLowerLeftY() + 40;
        }

    } else {

        yPos = (finalDocPageSize.getHeight() - (imgHeight * scaleFactor + yMarginPos));
    }

    return yPos;
}
}

Answer 1

添加了以下代码，以便在新页面上显示带有调整大小值的注释：

列表anotn=currentSourcePage。getAnnotations（）；

            for(PDAnnotation an :anotn) {
                PDRectangle rec = an.getRectangle();

                PDRectangle currentSourcePageMBox = currentSourcePage.getMediaBox();

                boolean isLandscape = currentSourcePageMBox.getWidth() > currentSourcePageMBox.getHeight();

                if(isLandscape) {

                    rec.setLowerLeftY(((rec.getLowerLeftY()) * scaleFactor) + 180 + 2 * ypos);
                    rec.setUpperRightY(((rec.getUpperRightY()) * scaleFactor) + 180 + 2*ypos);
                }
                else {
                    rec.setLowerLeftY(((rec.getLowerLeftY()) * scaleFactor) +  ypos);
                    rec.setUpperRightY(((rec.getUpperRightY()) * scaleFactor) +  ypos);
                }

                rec.setLowerLeftX((rec.getLowerLeftX() + xpos) * scaleFactor);
                rec.setUpperRightX((rec.getUpperRightX() + xpos ) * scaleFactor);                   

                an.setRectangle(rec);
            }

            // get all annotations and set on the new page.
            page.setAnnotations(currentSourcePage.getAnnotations());