Image positioning in iText - Java

问题:

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();

回答1:

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.

回答2:

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 a working example: http://itextpdf.com/examples/iia.php?id=70