【发布时间】：2015-01-13 16:08:08
【问题描述】：
我正在尝试制作带有视觉签名和 pdfbox 的 PDF。我有两个流，似乎 pdfbox 只能处理文件。如果没有三个临时文件，我无法让它工作。我可以从here 看到 API 已更改，但仍处理文件。
public void signPdf(InputStream originalPdf, OutputStream signedPdf,
InputStream image, float x, float y,
String name, String location, String reason) {
File temp = null;
File temp2 = null;
File scratchFile = null;
RandomAccessFile randomAccessFile = null;
OutputStream tempOut = null;
InputStream tempIn = null;
try {
/* Copy original to temporary file */
temp = File.createTempFile("signed1", ".tmp");
tempOut = new FileOutputStream(temp);
copyStream(originalPdf, tempOut);
tempOut.close();
/* Read temporary file to second temporary file and stream */
tempIn = new FileInputStream(temp);
temp2 = File.createTempFile("signed2", ".tmp");
tempOut = new FileOutputStream(temp2);
copyStream(tempIn, tempOut);
tempIn.close();
tempIn = new FileInputStream(temp2);
scratchFile = File.createTempFile("signed3", ".bin");
randomAccessFile = new RandomAccessFile(scratchFile, "rw");
/* Read temporary file */
PDDocument document = PDDocument.load(temp, randomAccessFile);
document.getCurrentAccessPermission().setCanModify(false);
PDSignature signature = new PDSignature();
signature.setFilter(PDSignature.FILTER_ADOBE_PPKLITE);
signature.setSubFilter(PDSignature.SUBFILTER_ADBE_PKCS7_DETACHED);
signature.setName(name);
signature.setLocation(location);
signature.setReason(reason);
signature.setSignDate(Calendar.getInstance());
PDVisibleSignDesigner signatureDesigner = new PDVisibleSignDesigner(
document, image, document.getNumberOfPages());
signatureDesigner.xAxis(250).yAxis(60).zoom(-90).signatureFieldName("signature");
PDVisibleSigProperties signatureProperties = new PDVisibleSigProperties();
signatureProperties.signerName(name).signerLocation(location)
.signatureReason(reason).preferredSize(0).page(1)
.visualSignEnabled(true).setPdVisibleSignature(signatureDesigner)
.buildSignature();
SignatureOptions options = new SignatureOptions();
options.setVisualSignature(signatureProperties);
document.addSignature(signature, dataSigner, options);
/* Sign */
document.saveIncremental(tempIn, tempOut);
document.close();
tempIn.close();
/* Copy temporary file to an output stream */
tempIn = new FileInputStream(temp2);
copyStream(tempIn, signedPdf);
} catch (IOException e) {
logger.error("PDF signing failure", e);
} catch (COSVisitorException e) {
logger.error("PDF creation failure", e);
} catch (SignatureException e) {
logger.error("PDF signing failure", e);
} finally {
closeStream(originalPdf);
closeStream(signedPdf);
closeStream(randomAccessFile);
closeStream(tempOut);
deleteTempFile(temp);
deleteTempFile(temp2);
deleteTempFile(scratchFile);
}
}
private void deleteTempFile(File tempFile) {
if (tempFile != null && tempFile.exists() && !tempFile.delete()) {
tempFile.deleteOnExit();
}
}
private void closeStream(Closeable is) {
if (is!= null) {
try {
is.close();
} catch (IOException e) {
logger.error("failure", e);
}
}
}
private void copyStream(InputStream is, OutputStream os) throws IOException {
byte[] buffer = new byte[1024];
int c;
while ((c = is.read(buffer)) != -1) {
os.write(buffer, 0, c);
}
is.close();
}
除了文件疯狂之外，我在签名上看不到任何文字。结果如下所示：
当我用 itext 库做类似的事情时，这就是它的样子
为什么视觉签名表示中缺少名称、位置和原因？我该如何解决？
【问题讨论】：
-
我可以看到 itext 和 pdfbox 生成的 PDF 命令存在差异，但我不是 PDF 格式专家。还没有。所以我会很感激任何帮助。您应该在
PDVisibleSignDesigner.zoom()javadoc 中说图像被缩放到原始图像的(100 - N)%，其中N是该方法的参数。 pdfbox.apache.org/docs/1.8.8/javadocs/org/apache/pdfbox/pdmodel/… -
其实应该是
(100 + N)%。
标签： java digital-signature pdfbox