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iText, loading an existing PDF and adding text to it

I have an existing PDF, a simple 2 page form. I need to load the PDF, and in relevant pages in the form, insert text so that it's unique to each person that downloads the PDF.
My initial idea was the load the PDF, and on page one simply overlay the text in the relevant place, however when I try the code below, all this does is add the text to the end of page 1, rather than at the top where I'm telling it to position it.
PdfReader pdfReader = new PdfReader(inputFile);
PdfStamper pdfStamper = new PdfStamper(pdfReader, new FileOutputStream(outputFile));
for(int i=1; i<= pdfReader.getNumberOfPages(); i++){
PdfContentByte content = pdfStamper.getOverContent(i);
if (i == 1) {
//Text over the existing page
BaseFont bf = BaseFont.createFont(BaseFont.HELVETICA, BaseFont.WINANSI, BaseFont.EMBEDDED);
content.beginText();
content.setFontAndSize(bf, 18);
content.showTextAligned(PdfContentByte.ALIGN_LEFT, "This is some text " + i, 0, 0, 0);
content.endText();
}
}
Could someone advise where I might be going wrong please?

iText add image to pdf - setAbsolutePosition [duplicate]

I am trying to read one PDF and copy its data into another PDF. The first PDF contains some text and images and I wish to write an image in the second PDF exactly where the text ends(which is basically the end of the PDF file). RIght now it just prints at the top. How can I make this change?
PdfReader reader = null;
reader = new PdfReader(Var.input);
Document document=new Document();
PdfWriter writer = null;
writer = PdfWriter.getInstance(document,new FileOutputStream(Var.output));
PdfImportedPage page = writer.getImportedPage(reader, 1);
reader.close();
document.open();
PdfContentByte cb = writer.getDirectContent();
// Copy first page of existing PDF into output PDF
document.newPage();
cb.addTemplate(page, 0, 0);
// Add your new data / text here
Image image = null;
image = Image.getInstance (Var.qr);
document.add(image);
document.close();

Try this:
First get the location/co-ords of where the image needs to go, then simply add the second line from below to your code so the image is inserted at that location "X, Y"
Image image = Image.getInstance(String RESOURCE);
image.setAbsolutePosition(X, Y);
writer.getDirectContent().addImage(image);
Take a look here for some examples in iText 5: https://itextpdf.com/en/resources/examples/itext-5-legacy/chapter-3-adding-content-absolute-positions

You should use a PdfStamper instead of a PdfWriter with imported pages. Your approach throws away all interactive contents. You can use sorifiend's idea there, too.
To determine where the text on the given page ends, have a look at the iText in Action, 2nd edition example ShowTextMargins which parses a PDF and ads a rectangle showing the text margin.

Extract pdf page and insert into existing pdf

I have below iText code, I want to copy one page from src pdf file to other pdf file(I have existing PdfStamper, here it is mainPdfStamper).
PdfReader srcReader = new PdfReader(new FileInputStream("source.pdf"));
File file = File.createTempFile("temporary", ".pdf");
PdfStamper pdfStamper = new PdfStamper(srcReader, new FileOutputStream(file));
PdfImportedPage importedPage = pdfStamper.getImportedPage(srcReader, 1);
// copying extracted page from src pdf to existing pdf
mainPdfStamper.getOverContent(1).addTemplate(importedPage, 10,10);
pdfStamper.close();
srcReader.close();
This is not working and I am not aware of how to achieve this. In short, I want to copy one page from source pdf to existing pdf. Please help.
UPDATE
Below code worked as per the answer from Bruno.
PdfReader reader2 = new PdfReader(srcPdf.getAbsolutePath());
PdfImportedPage page = pdfStamper.getImportedPage(reader2, 1);
stamper.insertPage(1, reader2.getPageSize(1));
pdfStamper.getUnderContent(1).addTemplate(page, 100, 100);
// Close the stamper and the readers
pdfStamper.close();
reader2.close();

Please read the documentation, for instance chapter 6 of iText in Action. If you go to section 6.3.4 ("Inserting pages into an existing document"), you'll find the InsertPages example.
You only need this code if p is the page number indicating where you want to insert the page, main_file is the path to your main file and to_be_inserted the path to the file that needs to be inserted (dest is the path to the resulting file):
PdfReader reader = new PdfReader(main_file);
PdfReader reader2 = new PdfReader(to_be_inserted);
// Create a stamper
PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(dest));
// Create an imported page to be inserted
PdfImportedPage page = stamper.getImportedPage(reader2, 1);
stamper.insertPage(p, reader2.getPageSize(1));
stamper.getUnderContent(i).addTemplate(page, 0, 0);
// Close the stamper and the readers
stamper.close();
reader.close();
reader2.close();
This is only one way to combine pages from two files. You can also use PdfCopy for this purpose. The advantage of using PdfCopy is the fact that you'll preserve the interactive features of the interactive page. When using PdfStamper, you'll lose any interactive feature (e.g. all links) that were present in the inserted page.

iText: Importing styled Text and informations from an existing PDF

I´m generating PDFs using iText and it works fine. But I need a way to import html styled informations from an existing PDF at some point.
I know i could just use the XMLWorker class to generate the text directly from html in my own document. But cause I´m not sure whether it actually supports all html features I´m looking to work around this.
Therefore a PDF is generated from html using XSLT. The content of this PDF then should be copied to my document.
There are two ways discribed in the book ("iText in Action").
One that parses the PDF and gets you the text (or other informations) from the document using PdfReaderContentParser and TextExtractionStrategy.
It looks like this:
PdfReader reader = new PdfReader(pdf);
PdfReaderContentParser parser = new PdfReaderContentParser(reader);
TextExtractionStrategy strategy;
for(int i=1;i<=reader.getNumberOfPages();i++){
strategy = parser.processContent(i, new LocationTextExtractionStrategy());
document.add(new Chunk(strategy.getResultantText()));
}
But this only prints plain text to the document. Obviously there are more ExtractionStrategys and maybe one of them does exactly what i want but i couldn´t find it yet.
The second way is to copy an itextpdf.text.Image of each side of the PDF to your document. This is obviously not a good idea, cause it will add the entire page to your document even if there is only one line of text in the existing PDF. Its done like this:
PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(RESULT));
PdfReader reader = new PdfReader(pdf);
PdfImportedPage page;
for(int i=1;i<=reader.getNumberOfPages();i++){
page = writer.getImportedPage(reader,i);
document.add(Image.getInstance(page));
}
Like I said this copys all the empty lines at the end of the PDF aswell, but i need to continue my text immediatly after the last line of text.
If I could convert this itext.text.Image into a java.awt.BufferedImage I could use getSubImage(); and informations i can extract from the PDF to cut away all the empty lines. But i wasn´t able to find a way to to this.
This are the two ways i found. But cause none of them is suitable for my purpose as they are my question is:
Is there a way to import everything except the empty lines at the end, but including text-style informations, tables and everything else from a PDF to my document using iText?

You can trim away empty space of the XSLT generated PDF and then import the trimmed pages as in your code.
Example code
The following code borrows from the code in my answer to Using iTextPDF to trim a page's whitespace. In contrast to the code there, though, we have to manipulate the media box, not the crop box, because this is the only box respected by PdfWriter.getImportedPage.
Before importing a page from a given PdfReader, crop it using this method:
static void cropPdf(PdfReader reader) throws IOException
{
int n = reader.getNumberOfPages();
for (int i = 1; i <= n; i++)
{
PdfReaderContentParser parser = new PdfReaderContentParser(reader);
MarginFinder finder = parser.processContent(i, new MarginFinder());
Rectangle rect = new Rectangle(finder.getLlx(), finder.getLly(), finder.getUrx(), finder.getUry());
PdfDictionary page = reader.getPageN(i);
page.put(PdfName.MEDIABOX, new PdfArray(new float[]{rect.getLeft(), rect.getBottom(), rect.getRight(), rect.getTop()}));
}
}
(excerpt from ImportPageWithoutFreeSpace.java)
The extended render listener MarginFinder is taken as is from the question linked to above. You can find a copy here: MarginFinder.java.
Example run
Using this code
PdfReader readerText = new PdfReader(docText);
cropPdf(readerText);
PdfReader readerGraphics = new PdfReader(docGraphics);
cropPdf(readerGraphics);
try ( FileOutputStream fos = new FileOutputStream(new File(RESULT_FOLDER, "importPages.pdf")))
{
Document document = new Document();
PdfWriter writer = PdfWriter.getInstance(document, fos);
document.open();
document.add(new Paragraph("Let's import 'textOnly.pdf'", new Font(FontFamily.HELVETICA, 12, Font.BOLD)));
document.add(Image.getInstance(writer.getImportedPage(readerText, 1)));
document.add(new Paragraph("and now 'graphicsOnly.pdf'", new Font(FontFamily.HELVETICA, 12, Font.BOLD)));
document.add(Image.getInstance(writer.getImportedPage(readerGraphics, 1)));
document.add(new Paragraph("That's all, folks!", new Font(FontFamily.HELVETICA, 12, Font.BOLD)));
document.close();
}
finally
{
readerText.close();
readerGraphics.close();
}
(excerpt from unit test method testImportPages in ImportPageWithoutFreeSpace.java)
I imported both the page from the docText document
and the page from the docGraphics document
into a new document with some text before, between, and after. The result:
As you can see, source styles are preserved but free space around is discarded.

How can I remove the first page of a PDF file with Java?

I was thinking about using a library such as PDFBox but I would like your input.

I can recommend iText, it works pretty well for manipulating PDFs or even constructing them from scratch.
There is also a tutorial on how to manipulate PDFs. I didn't see a way to delete pages, but the tool supports creating a new PDF by copying content from another one. So you could just copy all the pages but the first.

With IText
public void removeFirstPage(String input_filename, String output_filename) throws DocumentException, IOException {
File outFile = new File(output_filename);
PdfReader reader = new PdfReader(input_filename);
int pages_number = reader.getNumberOfPages();
if(pages_number > 0) {
Document document = new Document(reader.getPageSizeWithRotation(1));
PdfCopy copy = new PdfCopy(document, new FileOutputStream(outFile));
document.open();
for(int i=2; i <= pages_number;i++) {
PdfImportedPage page = copy.getImportedPage(reader, i);
copy.addPage(page);
}
document.close();
}
}