使用pdfbox 1.8.8进行可视签名
我正在尝试使用可视签名和pdfbox制作PDF。我有两个流，似乎pdfbox只能处理文件。没有三个临时文件，我没有设法让它工作。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();
}
除文件疯狂外，我在签名上看不到任何文字。结果如下：
这就是它的外观，当我用itext库做类似的事情时
为什么视觉签名表示中缺少名称，位置和原因？我该如何解决这个问题？
2 个答案:
答案 0 :(得分：7)
为什么视觉签名表示中缺少名称，位置和原因？
他们不在那里，因为他们没有画画。
iText表示可视化签名的默认方式是将这些信息添加到可视化中。
PDFBox的默认方式＆＃39;代表可视化签名的PDVisibleSigBuilder没有这样的信息。
既不是错误的也不是正确的，两者都只是默认值。
人们应该寻找这些信息的规范地点毕竟是签名小组。
我该如何解决？
签名可视化的实际内容由PDVisibleSigBuilder期间的signatureProperties.buildSignature()实例创建：
public void buildSignature() throws IOException
{
PDFTemplateBuilder builder = new PDVisibleSigBuilder();
PDFTemplateCreator creator = new PDFTemplateCreator(builder);
setVisibleSignature(creator.buildPDF(getPdVisibleSignature()));
}
因此，通过替换
signatureProperties.signerName(name).signerLocation(location)
.signatureReason(reason).preferredSize(0).page(1)
.visualSignEnabled(true).setPdVisibleSignature(signatureDesigner)
.buildSignature();
signatureProperties.signerName(name).signerLocation(location)
.signatureReason(reason).preferredSize(0).page(1)
.visualSignEnabled(true).setPdVisibleSignature(signatureDesigner);
PDFTemplateBuilder builder = new ExtSigBuilder();
PDFTemplateCreator creator = new PDFTemplateCreator(builder);
signatureProperties.setVisibleSignature(creator.buildPDF(signatureProperties.getPdVisibleSignature()));
对于此ExtSigBuilder课程的自定义版本PDVisibleSigBuilder，您可以在那里绘制任何内容，例如：
class ExtSigBuilder extends PDVisibleSigBuilder
{
String fontName;
public void createImageForm(PDResources imageFormResources, PDResources innerFormResource,
PDStream imageFormStream, PDRectangle formrect, AffineTransform affineTransform, PDJpeg img)
throws IOException
{
super.createImageForm(imageFormResources, innerFormResource, imageFormStream, formrect, affineTransform, img);
PDFont font = PDType1Font.HELVETICA;
fontName = getStructure().getImageForm().getResources().addFont(font);
logger.info("Added font to image form: " + fontName);
}
public void injectAppearanceStreams(PDStream holderFormStream, PDStream innterFormStream, PDStream imageFormStream,
String imageObjectName, String imageName, String innerFormName, PDVisibleSignDesigner properties)
throws IOException
{
super.injectAppearanceStreams(holderFormStream, innterFormStream, imageFormStream, imageObjectName, imageName, innerFormName, properties);
String imgFormComment = "q " + 100 + " 0 0 50 0 0 cm /" + imageName + " Do Q\n";
String text = "BT /" + fontName + " 10 Tf (Hello) Tj ET\n";
appendRawCommands(getStructure().getImageFormStream().createOutputStream(), imgFormComment + text);
logger.info("Added text commands to image form: " + text);
}
}
写＆＃34;你好＆＃34;在图像形式左下方大小为10的Helvetica（实际显示的形式）。
PS：在我看来，这背后的面向对象结构应该彻底改革。
答案 1 :(得分：2)
显示签名者的文字有时候看起来不太好。对我来说，我根据要显示的文本创建新的图像。并将其与签名图像合并。我可以为签名图片添加背景（公司名称水印）
以下是使用文字和背景创建新签名图片的代码：
public class ImageSignatory {
public static void main(String[] args) {
DateFormat df = new SimpleDateFormat("MM.dd.yyyy");
Date today = Calendar.getInstance().getTime();
String reportDate = df.format(today);
String text = "Signature eletronic Company AA DUC NGUYEN - Date " + reportDate;
String background = "background.png";
String signImage = "sign.jpg";
String textImage = createImageFromText(text);
String imageResultURL = null ;
try {
String mergedImage = mergeTwoImage(signImage, textImage);
imageResultURL = addBackgroundToImage(background, mergedImage);
} catch (Exception ex) {
}
}
public static String StringDivider(String s) {
StringBuilder sb = new StringBuilder(s);
int i = 0;
while ((i = sb.indexOf(" ", i + 30)) != -1) {
sb.replace(i, i + 1, "\n");
}
return sb.toString();
}
public static BufferedImage toBufferedImage(Image img) {
if (img instanceof BufferedImage) {
return (BufferedImage) img;
}
BufferedImage bimage = new BufferedImage(img.getWidth(null), img.getHeight(null), BufferedImage.TYPE_INT_ARGB);
Graphics2D bGr = bimage.createGraphics();
bGr.drawImage(img, 0, 0, null);
bGr.dispose();
return bimage;
}
public static String addBackgroundToImage(String backgroundPATH, String imagePath) {
try {
String imageResult = "result.jpg";
Image backgroundImage = ImageIO.read(new File(backgroundPATH));
int width = backgroundImage.getWidth(null);
int height = backgroundImage.getHeight(null);
Image signAndText = ImageIO.read(new File(imagePath));
signAndText = signAndText.getScaledInstance(width, height, Image.SCALE_SMOOTH);
signAndText = toBufferedImage(signAndText);
BufferedImage combined = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g2 = combined.getGraphics();
g2.drawImage(backgroundImage, 0, 0, null);
g2.drawImage(signAndText, 0, 0, null);
g2.dispose();
ImageIO.write(combined, "JPG", new File(imageResult));
return imageResult;
} catch (IOException ex) {
return null;
}
}
public static String mergeTwoImage(String first, String second) {
try {
String tempFileName = "merged_image.png";
Image signatoryImage = ImageIO.read(new File(first));
Image addtionalTextImage = ImageIO.read(new File(second));
float ratio = (float) signatoryImage.getWidth(null) / (float) addtionalTextImage.getWidth(null);
addtionalTextImage = addtionalTextImage.getScaledInstance((int) (ratio * (float) addtionalTextImage.getWidth(null)), (int) (ratio * (float) addtionalTextImage.getHeight(null)), Image.SCALE_SMOOTH);
addtionalTextImage = toBufferedImage(addtionalTextImage);
BufferedImage combinedTemp = new BufferedImage(signatoryImage.getWidth(null), signatoryImage.getHeight(null) + (int) (ratio * (float) addtionalTextImage.getHeight(null)), BufferedImage.TYPE_INT_ARGB);
Graphics g = combinedTemp.getGraphics();
g.drawImage(signatoryImage, 0, 0, null);
g.drawImage(addtionalTextImage, 0, signatoryImage.getHeight(null), null);
g.dispose();
ImageIO.write(combinedTemp, "PNG", new File(tempFileName));
return tempFileName;
} catch (IOException ex) {
return null;
}
}
public static String createImageFromText(String text) {
String tempFileName = "text.png";
text = StringDivider(text);
String[] textParts = text.split("\n");
BufferedImage img = new BufferedImage(1, 1, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = img.createGraphics();
Font font = new Font("Arial", Font.PLAIN, 48);
g2d.setFont(font);
FontMetrics fm = g2d.getFontMetrics();
int width = 0;
for (String textPart : textParts) {
int tempWidth = fm.stringWidth(textPart);
if (tempWidth > width) {
width = tempWidth;
}
}
width += 10;
int oneLineHeight = fm.getHeight();
int height = (oneLineHeight) * textParts.length;
g2d.dispose();
img = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
g2d = img.createGraphics();
g2d.setRenderingHint(RenderingHints.KEY_ALPHA_INTERPOLATION, RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY);
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setRenderingHint(RenderingHints.KEY_COLOR_RENDERING, RenderingHints.VALUE_COLOR_RENDER_QUALITY);
g2d.setRenderingHint(RenderingHints.KEY_DITHERING, RenderingHints.VALUE_DITHER_ENABLE);
g2d.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);
g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g2d.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
g2d.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_PURE);
g2d.setFont(font);
fm = g2d.getFontMetrics();
g2d.setColor(Color.BLACK);
int index = 0;
for (String textPart : textParts) {
g2d.drawString(textPart, 5, (oneLineHeight) * index + fm.getAscent());
index++;
}
g2d.dispose();
try {
ImageIO.write(img, "PNG", new File(tempFileName));
} catch (IOException ex) {
return null;
}
return tempFileName;
}
public static void removeFile(String fileName) {
try {
File file = new File(fileName);
file.delete();
} catch (Exception ex) {
}
}
}
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