pdfbox-标志横向文件错误

Question

我正在使用PDFbox-1.8.8在PDF文件上做签名功能。

它很好地工作与PDF文件在肖像模式。但是对于景观文件，我有一个问题

看起来坐标对景观文件来说是错误的。

public void signDetached(String inputFilePath, String outputFilePath, String signatureImagePath, Sign signProperties) {
    OutputStream outputStream = null;
    InputStream inputStream = null;
    PDDocument document = null;
    InputStream signImageStream = null;

    try {
        setTsaClient(null);
        document = PDDocument.load(inputFilePath);
        // create signature dictionary
        PDSignature signature = new PDSignature();
        signature.setFilter(PDSignature.FILTER_ADOBE_PPKLITE);
        signature.setSubFilter(PDSignature.SUBFILTER_ADBE_PKCS7_DETACHED);
        signature.setName("VANDUC1102");
        signature.setLocation(null);
        String displayName = "Hello World, Document signed by VANDUC1102";
        String reason = reasonText+ " " + displayName;
        signature.setReason(reason);

        // the signing date, needed for valid signature
        signature.setSignDate(Calendar.getInstance());            
        int signatureInPage = signProperties.getPageNumber() + 1;
        signImageStream = new FileInputStream(new File(signatureImagePath));
        PDVisibleSignDesigner visibleSig = new PDVisibleSignDesigner(inputFilePath, signImageStream, signatureInPage);

        float xAxis = convertPixel2Point(signProperties.getX()) ;
        float yAxis = convertPixel2Point(signProperties.getY());               
        float signImageHeight = convertPixel2Point(signImageHeight);    
        float signImageWidth = convertPixel2Point(signImageWidth);

        visibleSig.xAxis(xAxis)
                .yAxis(yAxis)
                .zoom(0)
                .signatureFieldName("Signature")
                .height(signImageHeight)
                .width(signImageWidth);
        PDVisibleSigProperties signatureProperties = new PDVisibleSigProperties();

        signatureProperties.signerName(eiUser.getName())
                 .signerLocation(null)
                 .signatureReason(reason)
                 .preferredSize(0)
                 .page(signProperties.getPageNumber())
                 .visualSignEnabled(true)
                 .setPdVisibleSignature(visibleSig)
                 .buildSignature();
         // register signature dictionary and sign interface
        SignatureOptions signatureOptions = new SignatureOptions();
        signatureOptions.setVisualSignature(signatureProperties);
        signatureOptions.setPage(signatureInPage);
        document.addSignature(signature, this, signatureOptions);

        File outputFile = new File(outputFilePath);
        outputStream = new FileOutputStream(outputFile);
        inputStream = new FileInputStream(inputFilePath);
        IOUtils.copyStream(inputStream, outputStream);
        document.saveIncremental(inputStream, outputStream);
        outputStream.flush();
    } catch (COSVisitorException | SignatureException | IOException ex) {
        log.error("signDetached ", ex);
    } finally {
        IOUtils.closeStream(outputStream);
        IOUtils.closeStream(inputStream);
        IOUtils.closeStream(signImageStream);
        IOUtils.closeStream(document);
    }
}
private float convertPixel2Point(float pixel){
    return pixel * (float) 72/96;
}

正如我所说的，这段代码很好地适用于肖像PDF

多谢了。

Answer 1

有问题的页面具有非零旋转值。PDFBox可视化签名类完全忽略了这个值，因此必须给它坐标和尺寸，就像页面没有旋转一样。

这可以通过添加以下switch语句来实现：

float xAxis = convertPixel2Point(/*signProperties.getX()*/x) ;
float yAxis = convertPixel2Point(/*signProperties.getY()*/y);               
float signImageHeight = convertPixel2Point(/*signImageHeight*/324);    
float signImageWidth = convertPixel2Point(/*signImageWidth*/309);

int rotation = getPageRotation(inputFilePath, page) % 360;
switch (rotation)
{
case 0:
    // all ok;
    break;
case 90:
    visibleSig.affineTransformParams(new byte[] {0, 1, -2, 0, 100, 0})
              .formaterRectangleParams(new byte[]{0, 0, 100, 100});

    float temp = yAxis;
    yAxis = visibleSig.getPageHeight() - xAxis - signImageWidth;
    xAxis = temp;

    temp = signImageHeight;
    signImageHeight = signImageWidth;
    signImageWidth = temp;

    break;
case 180:
    // Implement in a similar fashion
case 270:
    // Implement in a similar fashion
}

visibleSig.xAxis(xAxis)
          .yAxis(yAxis)
          .zoom(0)
          .signatureFieldName("Signature")
          .height(signImageHeight)
          .width(signImageWidth);

和以下方法：

private int getPageRotation(String documentPath, int page) throws IOException
{
    try (PDDocument document = PDDocument.load(documentPath))
    {
        List<?> pages = document.getDocumentCatalog().getAllPages();
        PDPage pageObject =(PDPage) pages.get(page);
        return pageObject.getRotation();
    }
}