Re: [iText-questions] Reading a PDF via a ByteArrayOutputStream?

Mork Afur Fri, 13 Apr 2007 06:49:46 -0700


Cool, thanks.

But didn't Bruno say below that: "Most viewer (certainly Adobe Reader) needthe PDF as a file; Adobe Reader doesn't accept a byte stream from memory."


How are you actually "viewing" the PDF in the browser?

Thanks in advance.

-- Jim

From: "Iliadis Yannis" <[EMAIL PROTECTED]>

Reply-To: Post all your questions about iText here<[EMAIL PROTECTED]>To: "Post all your questions about iText here"<[EMAIL PROTECTED]>

Subject: Re: [iText-questions] Reading a PDF via a ByteArrayOutputStream?
Date: Fri, 13 Apr 2007 16:37:05 +0300

To give you a small example:

First I define a static reference to the template (physical file).
   static String TEMPLATE_PATH="print/templates/template.pdf";

Later in my code I have a function which adds contents to the pdf.

          ByteArrayOutputStream policyAsOutputStream = new
ByteArrayOutputStream();

          InputStream
readerStream=getClass().getResourceAsStream(TEMPLATE_PATH);

          PdfReader polReader = new PdfReader(readerStream);

          PdfStamper polStamp = new PdfStamper(polReader,
policyAsOutputStream);

After that I do all my content manipulation (e.g. setting acrofields with
data, placing tables, list etc.)

And at the end I return the ByteArrayOutputStream which is servered through
the web service to the web client.

       return policyAsOutputStream;

2007/4/13, Mork Afur <[EMAIL PROTECTED]>:


Interesting.

It really sounds like the file based approach makes more sense (since the
Adobe plug-in can't handle memory-only baos's).

Iliadis mentioned reading the PDF into a ByteArrayOutputStream.  However,
checking around the book (including chapter 17), I didn't find a simple
way
to load an existing file-based PDF into a baos.

The following example files use baos, but, don't seem to load an existing
PDF into one. (probably because it's not useful?)

C:\temp\examples\chapter02\HelloWorldAddMetadata.java
C:\temp\examples\chapter02\HelloWorldCopyStamp.java
C:\temp\examples\chapter02\HelloWorldStampCopy.java
C:\temp\examples\chapter02\HelloWorldStampCopyStamp.java
C:\temp\examples\chapter17\FoobarCourses.java
C:\temp\examples\chapter17\helloworld.jsp
C:\temp\examples\chapter17\OutSimplePdf.java
C:\temp\examples\chapter17\ProgressServlet.java
C:\temp\examples\chapterF\HelloWorldAddMetadata.java
C:\temp\examples\chapterF\HelloWorldXmpMetadata.java

Thanks in advance.

M


>From: "Bruno Lowagie (iText)" <[EMAIL PROTECTED]>
>Reply-To: Post all your questions about iText here
><[EMAIL PROTECTED]>
>To: Post all your questions about iText here
><[EMAIL PROTECTED]>

>Subject: Re: [iText-questions] Reading a PDF via aByteArrayOutputStream?

>Date: Fri, 13 Apr 2007 13:43:37 +0200
>
>Strange, I received the answer to this question,
>but not the original question. Anyhow:
>
>Iliadis Yannis wrote:
> > I for myself read a pdf template (physical file) into a
> > ByteArrayOutputStream and pass it to a PdfStamper where I do all the
> > manipulation (in your case a PdfWriter object).
>
>That's an ideal way to do it if you are reusing
>the same template over and over again.
>
> > After that the final pdf (still a ByteArrayOutputStream) is send
through
> > a web service to the clients web browser. From there the adobe reader
> > plug takes over and shows the pdf.
>
>Yep, but remember that the PDF will be stored somewhere
>as a file on the client machine (maybe only temporarily).
>Most viewer (certainly Adobe Reader) need the PDF as a
>file; Adobe Reader doesn't accept a byte stream from memory.
>
> > 2007/4/13, Mork Afur <[EMAIL PROTECTED]
> > <mailto:[EMAIL PROTECTED]>>:
> >
> >     In the case where a file-based PDF would have a short life span,
we
>are
> >     thinking about just using a ByteArrayOutputStream representation
for
> >     creating and viewing the PDF.
> >
> >     Is this possible? I'm not sure how we'd "view" the
> >     ByteArrayOutputStream.
> >

> > Also, there is only one example (in the 297 java examples withthe

>book)
> >     that returns a "baos" object.
>
>In Chapter 2 I explain that you can write to any OutputStream,
>including a ByteArrayOutputStream. Point is: how are you going
>to send those bytes to a Viewer?
>If you really want to keep the documents in memory only,
>you could try writing a PDF to a Ramdisk and let the viewer
>read it from there. I haven't tried this yet. Do people still
>use ramdisk? I feel very old when I use that word...
>
>br,
>Bruno
>
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Re: [iText-questions] Reading a PDF via a ByteArrayOutputStream?

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