When I view a 3D pdf (aka PDF/E) with Adobe Acrobat Reader, it shows a thumbnail on the left side:
Is it possible to extract this thumbnail from the pdf using itext or is it generated on the fly by the viewer?
This is possible, though from what I am seeing I doubt your PDF has a specific thumbnail image and just renders the page in the thumbnail.
First, let's create a PDF that has a thumbnail according to the PDF specification since I couldn't find one. Section 12.3.4 of ISO-3200-2 (the PDF specification) states the following:
The thumbnail image for a page shall be an image XObject specified by the Thumb entry in the page object...
This can be easily created using iText like so:
PdfWriter writer = new PdfWriter(OUTPUT_FILE);
PdfDocument pdfDocument = new PdfDocument(writer);
Document document = new Document(pdfDocument);
document.add(new Paragraph("Hello world"));
PdfImageXObject thumbnail = new PdfImageXObject(ImageDataFactory.create(getInput("itext.png")));
pdfDocument.getFirstPage().getPdfObject().put(PdfName.Thumb, thumbnail.getPdfObject());
document.close();
Where getInput("itext.png") resolves to a full path of our image:
This gives us output.pdf
You'll note that neither Acrobat nor Reader display the thumbnail image- they simply render the page. Other readers do use our new thumbnail:
Since you are using reader I would think this means the thumbnail in your PDF is simply the rendered page since thumbnails appear to be ignored.
To answer your question, getting the thumbnail is simply the reverse of the operation above- we get the Page's dictionary and look for a /Thumb entry
PdfReader reader = new PdfReader(OUTPUT_FILE);
PdfDocument pdfDocument = new PdfDocument(reader);
PdfStream thumbnailStream = pdfDocument.getFirstPage().getPdfObject().getAsStream(PdfName.Thumb);
if (thumbnailStream != null) {
PdfImageXObject thumbnail = new PdfImageXObject(thumbnailStream);
BufferedImage image = thumbnail.getBufferedImage();
//Output to file, memory, etc
}
Related
I am using PdfFormXObject pageCopy = sourcePage.CopyAsFormXObject(pdf); to then insert pageCopy into a new PDF page using pdfCanvas.AddXObjectFittedIntoRectangle. The copied page is visible in the new PDF as expected, but it how has it's 'hidden' OCGs visible.
The reason I am doing this is to be able to take a PDF page, scale and crop it and add it to a new PDF where it may be collated with other contents.
Is there a way to remove OCG PDF content prior to create the XObject, or is there a different way of achieving my goal without using the XObject route that allows me to maintain the 'off' status of hidden OCGs
OCG removal functionality is not yet available in iText 7.
There is, however, a workaround that you can try to apply: we can copy all the information about OCGs from your source document to the target document which should create the same OCGs in the target document and preserve default on/off states.
To copy the OCGs, you can copy a page from one document to another one (which is going to copy all the OCGs) and then remove that page.
When the OCG removal functionality becomes available in iText the approach would become cleaner but for now you can use the code similar to the following:
PdfDocument sourceDocument = new PdfDocument(new PdfReader(sourcePdfPath));
PdfDocument targetDocument = new PdfDocument(new PdfWriter(targetPdfPath));
PdfFormXObject pageCopy = sourceDocument.getFirstPage().copyAsFormXObject(targetDocument);
PdfPage page = targetDocument.addNewPage();
PdfCanvas canvas = new PdfCanvas(page);
canvas.addXObject(pageCopy);
// Workaround: copying the page from source document to destination document also copies OCGs
sourceDocument.copyPagesTo(1, 1, targetDocument);
// Workaround: remove the page that we only copied to make sure OCGs are copied
targetDocument.removePage(targetDocument.getNumberOfPages());
sourceDocument.close();
targetDocument.close();
I'm trying to convert html to pdf using iText.
Here is the simple code that is working fine :
ByteArrayOutputStream pdfStream = new ByteArrayOutputStream();
HtmlConverter.convertToPdf(htmlAsStringToConvert, pdfStream)
Now, I want to convert the pdf to LANDSCAPE mode, so I've tried :
ConverterProperties converterProperties = new ConverterProperties();
MediaDeviceDescription mediaDeviceDescription = new MediaDeviceDescription(MediaType.SCREEN);
mediaDeviceDescription.setOrientation(LANDSCAPE);
converterProperties.setMediaDeviceDescription(mediaDeviceDescription);
HtmlConverter.convertToPdf(htmlAsStringToConvert, pdfStream, converterProperties);
and also :
PdfDocument pdfDoc = new PdfDocument(writer);
pdfDoc.setDefaultPageSize(PageSize.A4.rotate());
HtmlConverter.convertToPdf(htmlAsStringToConvert, pdfDoc, new ConverterProperties()).
I've also mixed both, but the result remains the same, the final PDF is still in default mode.
The best way to achieve landscape page size when converting HTML to PDF is to provide the corresponding CSS instruction for the page to become landscape.
This is done with the following CSS:
#page {
size: landscape;
}
Now, if you have your input HTML document in htmlAsStringToConvert variable then you can process it as an HTML using Jsoup library which iText embeds. Basically we are just adding the necessary CSS instruction into our <head>:
Document htmlDoc = Jsoup.parse(htmlAsStringToConvert);
htmlDoc.head().append("<style>" +
"#page { size: landscape; } "
+ "</style>");
HtmlConverter.convertToPdf(htmlDoc.outerHtml(), new FileOutputStream(outPdf));
Beware that if you already have #page declarations in your HTML then the one you append might be in conflict with the ones you already have - in this case, you need to make sure you insert your declaration as the latest one (this should be the case with the code above as long as all of your declaration are in <head> element).
I have to fill pdf fields.
What I have done so far is to open my pdf like a form with Adobe Acrobat and then save it. It turns into a pdf forms and with Apache PdfBox I can achieve what I want to do.
Unfortunately, I must not open it with an external program. And if I don't do this little trick, I have an empty array with :
DDocument pdfDoc = PDDocument.load(new File(path));
PDDocumentCatalog docCatalog = pdfDoc.getDocumentCatalog();
PDAcroForm acroForm = docCatalog.getAcroForm();
acroForm.getFields() //empty
Is it possible to create dynamicly in java my future fields from a simple pdf?
Thanks in advance
I am adding images to my html file and trying to convert it to pdf. Though my html file shows images and css styles properly, pdf overlaps the content and doesn't show complete html file.
File dest = new File(\\some path\\ gen.pdf);
PdfWriter writer = new PdfWriter(dest);
PdfDocument pdfDocument = new PdfDocument(writer);
//pdfDocument.setDefaultPageSize(PageSize.B0);
// I have tried PageSize and addPage but that didn't work maybe because I have added writer in PdfDocument and then added pages. I didn't find any other way of adding it (this also didn't work).
ConverterProperties converterProperties = new ConverterProperties();
converterProperties.setBaseUri(absolutePath);
FileInputStream fis = new FileInputStream(newHtmlFile); // passing here html file
HtmlConverter.convertToPdf(fis, pdfDocument, converterProperties);
html
in styles I have given #page { size: 11in 14in; } also positions are position:absolute;
After converting to pdf I get the error:
c.i.layout.renderer.AbstractRenderer : Occupied area has not been initialized. Absolute positioning might be applied incorrectly.
This is screenshot of html:
pdf created using itext7:
Thanks in advance I have tried everything but it didn't work for me I have also tried flying saucer in that also images are not loading. Any help will be appreciated.
I have the data containing emoji in database. I want to display in the generated document such as pdf or in excel format.
I am using spring boot application. Please suggest any java library for generating either PDF or excel which supports emoji.
iText supports this. Assuming
your emoji is a unicode character
you use a font that contains the correct glyph for this unicode character
Best way to test this is to try it.
This is how to get started with iText:
https://developers.itextpdf.com/content/itext-7-jump-start-tutorial/installing-itext-7
And this is a small code-snippet that adds text to a document with different fonts:
PdfDocument pdf = new PdfDocument(new PdfWriter(dest));
Document document = new Document(pdf);
PdfFont font = PdfFontFactory.createFont(FontConstants.TIMES_ROMAN);
PdfFont bold = PdfFontFactory.createFont(FontConstants.TIMES_BOLD);
Text title =
new Text("The Strange Case of Dr. Jekyll and Mr. Hyde").setFont(bold);
Text author = new Text("Robert Louis Stevenson").setFont(font);
Paragraph p = new Paragraph().add(title).add(" by ").add(author);
document.add(p);
document.close();
For more information check out the tutorials.
https://developers.itextpdf.com/content/itext-7-building-blocks/chapter-1