Am 01.03.2017 um 18:49 schrieb Thad Humphries:
On Wed, Mar 1, 2017 at 12:32 PM, Tilman Hausherr <[email protected]>
wrote:
Am 01.03.2017 um 12:29 schrieb Thad Humphries:
On Wed, Mar 1, 2017 at 3:29 AM, Tilman Hausherr <[email protected]>
wrote:
Am 28.02.2017 um 23:51 schrieb Thad Humphries:
No, the document has not been closed prematurely.
and what's that?
inDoc.close();
Well how about that?! When I comment out closing the second document, it
works. Why? I've merged many PDFs, and all work when inDoc is closed.
Hi,
The probably reason is that the merged document uses some resources of the
original documents. Maybe it's a bug, maybe not (if we clone too much the
files may get too big); but the point is that if you close the original
document too early (by closing actively, or by letting the objects running
out of scope) you close parts that have to stay open. Solution: first save
and close your destination document, then close your source documents. The
downside is that it will use more memory.
Tilman
Can I repeatedly close and reopen the destination PDDocument? Can I safely
leave source open (inDoc), and let Java clean itself when my PrintToPdf
class is out of scope? What might be the cost of either in time and
resources (currently, we find PDFBox pleasingly fast).
No you should close inDoc too. Yes you can close and reopen your
destination document. I've heard other people do this to lessen the
memory footprint. Of course it will be slightly slower.
Btw be careful about adding documents that you just created. This will
not work if you use fonts that are subsetted, you need to save and
reload such PDDocument.
Tilman
Here's my situation: A web user requests a file collection by passing the
server an identifier. Until the collection is open, the server does not
know how many files are in the collection, and until it steps through each,
it does not know what type of files they are--TIFF, PDF, JPEG, text, etc. A
new PDDocument is created, and each image file is retrieved, processed into
a BufferedImage, and added to the document.
In other cases, a single image is put into a new PDDocument, then a
PDDocument with notes about the image is created, and appended using my
merge method:
inDoc is the second file (source; my odd file, moroccan_chicken.pdf). It's
the second parameter to PDFMergerUtility appendDocument():
public void appendDocument(PDDocument
<http://localhost/~thad/pdfbox/pdfbox-2.0.4/org/apache/
pdfbox/pdmodel/PDDocument.html>
destination,
PDDocument
<http://localhost/~thad/pdfbox/pdfbox-2.0.4/org/apache/
pdfbox/pdmodel/PDDocument.html>
source)
throws IOException
<http://download.oracle.com/javase/1.6.0/docs/api/java/io/IO
Exception.html?is-external=true>
PDFDocument document is destination.
PDDocument inDoc is source.
inDoc is out of scope by the time document.save() is called.
Is there any harm in keeping inDoc open? There could be *many* instances
of
it before I'm done: I open a PDDocument, and add images and other PDFs to
it before sending it to a browser with
ServletUtils.sendPDFHeader(filename, response); // my utility.
ServletOutputStream out = response.getOutputStream();
document.save(out);
document.close();
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