I'm generating a PDF with iText, in that I'm displaying a header and footer.
Now i want to remove header for a particular page.
For eg: If I'm generating a 50 pages pdf, for the final 50th I don't want to show header,
how could this be achieved?
Here's my code where I'm generating footer (header part removed).
public class HeaderAndFooter extends PdfPageEventHelper {
public void onEndPage (PdfWriter writer, Document document) {
Rectangle rect = writer.getBoxSize("art");
switch(writer.getPageNumber() % 2) {
case 0:
case 1:
ColumnText.showTextAligned(writer.getDirectContent(),
Element.ALIGN_CENTER, new Phrase(String.format("%d", writer.getPageNumber())),
300f, 62f, 0);
break;
}
}
}
Any suggestions? Thanks in advance.
You can use a 2-pass approach:
1st pass : generate the PDF file without header
2nd pass : stamp the header on all but the last page
Have a look at this example taken from the iText book. You'll just have to adapt the second pass by only going through the N-1 first pages:
int n = reader.getNumberOfPages() - 1;
instead of
int n = reader.getNumberOfPages();
I was also in need to do the same. I want to share how I resolved this issue.
The Idea is, for the automatic generation of header footer, we set page event on PDFWriter like:
HeaderAndFooter event= new HeaderAndFooter(); //HeaderAndFooter is the implementation of PdfPageEventHelper class
writer.setPageEvent(event);// writer is the instance of PDFWriter
So, before the content of the last page, We can remove the event:
event=null;
writer.setPageEvent(event);
It works for me without any error or exception.
Related
I'm using iText 7 to construct reusable PDF components that I reuse across multiple pages within a document. I'm using iText-dotnet for this task (v7), using F# as the language. (This shouldn't be hard to follow for non-F# people as it's just iText calls :D)
I know how to add annotations to a Page, that isn't the issue. Adding the annotation to the page is as simple as page.AddAnnotation(newAnnotation).
Where I'm having difficulty, is that there is no "Page" associated with a Canvas when you are using a PdfFormXObject() to render a Pdf fragment.
let template = new PdfFormXObject(rect)
let templateCanvas = PdfCanvas(template, pageContext.Canvas.GetPdfDocument())
let newCanvas = new Canvas(templateCanvas, rect)
Once I have the new Canvas, I try to write to the Canvas and add the Annotation via Page.AddAnnotation(). The problem is that there is no Page attached to the PdfFormXObject!
// Create the destination and annotation (destPage is the pageNumber)
let dest = PdfExplicitDestination.CreateFitB(destPage)
let action = PdfAction.CreateGoTo(dest)
let annotation = PdfLinkAnnotation(rect)
let border = iText.Kernel.Pdf.PdfAnnotationBorder(0f, 0f, 0f)
// set up the Annotation with action and display information
annotation
.SetHighlightMode(PdfAnnotation.HIGHLIGHT_PUSH)
.SetAction(action)
.SetBorder(border)
|> ignore
// Try adding the annotation to the page BOOM! (There is *NO* page (null) associated with newCanvas)
newCanvas.GetPage().AddAnnotation(annotation) |> ignore // HELP HERE: Is there another way to do this?
The issue is that I do not know of a different way to set the Annotation on the canvas. Is there a way to render the annotation and just add the annotation directly to the canvas as raw PDF instructions?
Alternatively, is there a way create a different reusable PDF fragment in iText so I can also reuse the GoTo annotation.
N.B. I could split off the annotations and then apply them every time I use the PdfFormXObject() on a new page, but that sort of defeats the purpose of reusing Pdf fragments (template) in my final PDF to reduce it's size.
If you can point me in the right direction, that would be great.
Again, this is not how to add an annotation to a Page(), that's easy. It's how to add an annotation to a PdfFormXObject (or similar mechanism that I'm unaware of for constructing rusable Pdf fragments).
-- As per John's comments below:
I cannot seem to find any reference to single use annotations.
I'm aware of the following example link, so I modified it to look like this:
private static void Main(string[] args)
{
try
{
PdfDocument pdfDocument = new PdfDocument(new PdfWriter("TestMultiLink.pdf"));
Document document = new Document(pdfDocument);
string destinationName = "MyForwardDestination";
// Create a PdfStringDestination to use more than once.
var stringDestination = new PdfStringDestination(destinationName);
for (int page = 1; page <= 50; page++)
{
document.Add(new Paragraph().SetFontSize(100).Add($"{page}"));
switch (page)
{
case 1: // First use of PdfStringDestination
document.Add(new Paragraph(new Link("Click here for a forward jump", stringDestination).SetFontSize(20)));
break;
case 3: // Re-use the stringDestination
document.Add(new Paragraph(new Link("Click here for a forward jump", stringDestination).SetFontSize(10)));
break;
case 42:
pdfDocument.AddNamedDestination(destinationName, PdfExplicitDestination.CreateFit(pdfDocument.GetLastPage()).GetPdfObject());
break;
}
if (page < 50)
document.Add(new AreaBreak(AreaBreakType.NEXT_PAGE));
}
document.Close();
}
catch (Exception e)
{
Console.WriteLine($"Ouch: {e.Message}");
}
}
If you dig into the iText source for iText.Layout.Link, you'll see that the String Destination is added as an Annotation. Therefore, I'm not sure if John's answer is true anymore.
Does anyone know how I can convert the Annotation to a Dictionary and how I would go about adding the PdfDictionary (raw) info into the PftFormXObject?
Thanks
#johnwhitington is correct.
Per PDF specification, annotations can only be added to a page, they cannot be added to a form XObject. It is not a limitation of iText or any other PDF library.
Annotations cannot be reused, each annotation is a distinct object.
I'm setting the visibility of a PdfFormField to HIDDEN using the setVisibility() method with parameter PdfFormField.HIDDEN. Still, on flattening it, the field does not hide. Below is the code to do so.
File file = new File("path to PDF file");
baos = new ByteArrayOutputStream();
pdfDoc = new PdfDocument(new PdfReader(file.getAbsolutePath()), new PdfWriter("path to flattened PDF file"));
//This function removes all the permissions.
removePdfPermissions();
form = PdfAcroForm.getAcroForm(pdfDoc, true);
fields = form.getFormFields();
fields.get("HumanSubjectsText").setVisibility(PdfFormField.HIDDEN);
fields.get("HumanSubjects").setVisibility(PdfFormField.HIDDEN);
form.flattenFields();
pdfDoc.close();
Setting the values of the fields to empty string "" is a workaround, but not the proper way.
The fields "HumanSubjects" and "HumanSubjectsText" correspond to a checkbox and its correspond text on page 2. (Human Subjects)
Link to PDF file
The fields could not be hidden using iText library. In contrast to Bruno's comment, one of the methods from iText library worked well, the setValue(). I'm not quite sure why the setVisibility() fails.
However, I was able to hide the field using Master PDF editor tool. I've attached a screenshot of this tool, where you can change the visibility for a form field from the General tab.
An observation: In the com.itextpdf.forms.fields.PdfFormField some of the constants defined are as follows:
public static final int HIDDEN = 1;
public static final int VISIBLE_BUT_DOES_NOT_PRINT = 2;
public static final int HIDDEN_BUT_PRINTABLE = 3;
public static final int VISIBLE = 4;
The Master PDF editor also has similar options to hide a field. Please refer to the attached screenshot.
NOTE: My requirement was just to simply hide the field. It could be achieved programmatically by using a library like iText or with some PDF editor tool.
I have a huge pdf containing >1000 pages, need to edit existing text, offcourse it is added by me using pdfbox addtext to each page example ... the text font size was very big text runs out of page..
now i want to decrease the size of font so that it will be within page limits... or i can clear the existing text and replace a the same text with new font...
credits to Tilman Hausherr for answer
If you used the code you linked to, then you will find the "added message" in the content stream array, as the second last item. PDPage.getCosObject().getItem(COSName.Contents) and save the file.
public void removeStamp(File src) throws IOException {
PDDocument doc = PDDocument.load(src);
PDPageTree pages = doc.getPages();
for (PDPage page : pages) {
COSArray array = ((COSArray) page.getCOSObject().getItem(COSName.CONTENTS));
array.remove(array.size() - 1);
}
doc.save(src);
}
I would like to split to generate a new pdf by concatenating certain individual pages, but the last page has to be split at a certain point (i.e. all content above a limit to be included and everything below to be excluded - I only care about the ones having their upper left corner above a line). Is that possible using PDFbox?
One way to achieve the task, i.e. to split a page at a certain point (i.e. all content above a limit to be included and everything below to be excluded) would be to prepend a clip path.
You can use this method:
void clipPage(PDDocument document, PDPage page, BoundingBox clipBox) throws IOException
{
PDPageContentStream pageContentStream = new PDPageContentStream(document, page, true, false);
pageContentStream.addRect(clipBox.getLowerLeftX(), clipBox.getLowerLeftY(), clipBox.getWidth(), clipBox.getHeight());
pageContentStream.clipPath(PathIterator.WIND_NON_ZERO);
pageContentStream.close();
COSArray newContents = new COSArray();
COSStreamArray contents = (COSStreamArray) page.getContents().getStream();
newContents.add(contents.get(contents.getStreamCount()-1));
for (int i = 0; i < contents.getStreamCount()-1; i++)
{
newContents.add(contents.get(i));
}
page.setContents(new PDStream(new COSStreamArray(newContents)));
}
to clip the given page along the given clipBox. (It first creates a new content stream defining the clip path and then arranges this stream to be the first one of the page.)
E.g. to clip the content of a page along the horizontal line 650 units above the bottom, do this:
PDPage page = ...
PDRectangle cropBox = page.findCropBox();
clipPage(document, page, new BoundingBox(
cropBox.getLowerLeftX(),
cropBox.getLowerLeftY() + 650,
cropBox.getUpperRightX(),
cropBox.getUpperRightY()));
For a running example look here: ClipPage.java.
I have a PDF with a CropBox size of 6" wide x 9" high. I need to add it to a standard letter-sized PDF. If I change the CropBox size, then the cropmarks become visible. So ideally what I'd like to do is crop out just the visible portion of the page, then pad the sides so that the total height and width is letter-sized.
Is this possible using PDFBox or another Java class?
Have you found an answer to your problem ? I have been facing the same scenario this week.
I have a standard letter-size (8,5" x 11") PDF A, containing a header, a footer, and a form. I have no control over that PDF's generation, so the header and footer are a bit dirty and I need to remove them. My first approach was to extract the form into a Box (any type of box works), and then export it as a new PDF page. Problem is, my new Box is a certain size (let's say 6" x 7"), and after thorough research into the docs, I was unable to find a way to embed it into a 8,5" x 11" PDF B ; the output PDF was the same size as my Box. All scenarios either led to a blank PDF file of the right size, or a PDF containing my form but of wrong dimensions.
I then had no choice but to use another approach. It isn't very clean, but hey, when working with PDFs, black magic and workarounds are the main topic. I simply kept the original PDF A, and blanked out all the unwanted parts. That means, I created rectangles, filled them with white, and covered up the sections I wanted to hide. Result is a PDF file, of right dimension, containing only my form. Hooray ! Technically, the header and footer are still present in the page, there was no way to actually remove them ; I was only able to hide them (this doesn't make any difference to the end user as long as you're not hiding sensitive data).
I realize your question was submitted 2 years ago, but I had a very hard time finding a proper answer to my question online, so here's me giving back to the community, and hoping I can help future developers save some time. If you actually found a way to extract a box and embed it in a standard-size page, please post your answer !
Here is my code by the way :
import org.apache.pdfbox.exceptions.COSVisitorException;
import org.apache.pdfbox.pdmodel.*;
import org.apache.pdfbox.pdmodel.edit.PDPageContentStream;
import java.awt.Color;
import java.io.*;
import java.util.List;
// This code doesn't actually extract PDF elements per say
// It fills 2 rectangles in white to hide the header and the footer of our PDF page
public class ex {
// Arbitrary values obtained in a very obscure way
static int PAGE_WIDTH = 615;
static int PAGE_HEIGHT = 815;
#SuppressWarnings("unchecked")
public static void main(String[] args) throws IOException, COSVisitorException {
File inputFile = new File("C:\\input.pdf");
File outputFile = new File("C:\\output.pdf");
PDDocument inputDoc = PDDocument.load(inputFile);
PDDocument outputDoc = new PDDocument();
List<PDPage> pages = inputDoc.getDocumentCatalog().getAllPages();
PDPageContentStream pageCS = null;
// Lets paint our pages white !
for (PDPage page : pages) {
pageCS = new PDPageContentStream(inputDoc, page, true, false);
pageCS.setNonStrokingColor(Color.white);
// Top rectangle
pageCS.fillRect(0, 0, PAGE_WIDTH, 30);
// Bottom rectangle
pageCS.fillRect(0, PAGE_HEIGHT-30, PAGE_WIDTH, 30);
pageCS.close();
outputDoc.addPage(page);
}
// Save to file
outputFile.delete();
outputDoc.save(outputFile);
// Wait until the end to close all documents, or else you get an error
inputDoc.close();
outputDoc.close();
}
}
I have adopted the answer of John a little bit, maybe this will help someone.
I have changed the loop to create a new rectangle, with the wanted dimensions. Then the rectangle is set to the page and afterwards added to the new document. I used this snippet to crop a black border out of a long scanned document.
Notice that this will change the size of the pages.
import org.apache.pdfbox.exceptions.COSVisitorException;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.common.PDRectangle;
import org.apache.pdfbox.pdmodel.edit.PDPageContentStream;
import java.io.File;
import java.io.IOException;
import java.util.List;
public class Main {
#SuppressWarnings("unchecked")
public static void main(String[] args) throws IOException, COSVisitorException {
File inputFile = new File("/path/to/your/file");
File outputFile = new File("/path/to/your/file");
PDDocument inputDoc = PDDocument.load(inputFile);
PDDocument outputDoc = new PDDocument();
List<PDPage> pages = inputDoc.getDocumentCatalog().getAllPages();
// Lets paint our pages white !
for (PDPage page : pages) {
PDRectangle rectangle=new PDRectangle();
rectangle.setLowerLeftX(0);
rectangle.setLowerLeftY(0);
rectangle.setUpperRightX(500);
rectangle.setUpperRightY(680);
page.setMediaBox(rectangle);
page.setCropBox(rectangle);
outputDoc.addPage(page);
}
// Save to file
// outputFile.delete();
outputDoc.save(outputFile);
// Wait until the end to close all documents, or else you get an error
inputDoc.close();
outputDoc.close();
}
}
Other than adding a rectangle to the PDPage constructor you can do this do set the CropBox to any size:
PDRectangle box = new PDRectangle(pageWidth, pageHeight);
page.setMediaBox(box); // MediaBox > BleedBox > TrimBox/CropBox