Oliver Schoenwald wrote:
> Hello and good morning from Germany,
Good morning from Belgium! We're neighbors ;-)
> Because the webapplication should not write unnecessary data to the
> filesystem, because the created pages are
> to be send to the webclient only, so I want to handle the whole
> PDF-Document (loaded, created, changed, concatenated etc.)
> in memory only.
OK, that's also how I write my web applications:
nothing is stored on disk on the serverside.
However, this is totally wrong:
> --- snip! ---
> private static byte[] readDocument(PdfReader reader) throws
> DocumentException, IOException {
> ByteArrayOutputStream baos = new ByteArrayOutputStream();
> for ( int i = 1; i <= reader.getNumberOfPages(); i++ ) {
> byte[] content = reader.getPageContent(i);
> baos.write(content, 0, content.length);
> }
> return baos.toByteArray();
> --- snip!---
The page content is a stream of PDF syntax.
For instance:
q
BT
36 806 Td
0 -18 Td
/F1 12 Tf
(Hello World)Tj
ET
Q
In your code snippet, you are concatenating streams
like this, throwing away the document structure,
resources like the font /F1, and so on...
> Alas, the result seems to be broken.
That's only normal.
> When I use the resulting byte-Array
> to create a new PDFReader-object,
> "java.io.IOException: PDF header signature not found" is being thrown.
One of the items in the above 'and so on...',
is the document header: something like: %PDF-1.4
> I assume that the PDF-Document contains more than is being put into the
> byte-Array when using getPageContent(int).
That's an understatement ;-)
> What would be the more convenient method to load and handle a
> PDF-Document in memory space? Or do I have to
> add something to my readDocument()-method to migrate the complete
> PDF-Document to the byte-Array?
You don't need any iText related code to read a file
into a byte[]. You can do this with the usual java.io methods.
Or you could use the iText class RandomAccessFileOrArray:
new RandomAccessFileOrArray(pdf);
where the parameter pdf can be a filename, a byte[], an InputStream,...
I think that's the class you're looking for.
br,
Bruno
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