I would like to implement lazy loading PDFs. Going through the forums we need to make make the PDF documents as 'linearized' and It will load first few pages quickly because it store page references in the start of the file. Will this resolve below problem as well.
There is separate charge for data transfer in AWS. Users want to see only first pages, But our system has to download entire PDF document that may be huge file. So we have to pay more money. If linearized PDF solves how to implement in Java technoglogy while download
The way a linearized PDF is processed by a PDF reader is implementation dependent, but I dare to say that in all cases, it is very likely that the reader will just continue to download the rest of the file in the background after showing the first page. The goal of linearization is not to prevent the rest of the file from being downloaded.
An alternative could be for you to split the file in sections and provide bookmarks that point to external PDF documents that will allow navigating through all the sections.
Related
I have a web application using iText v2.1.7 to create PDFs; before anyone tries to move me to a different library, let me point out that, like most programmers, I don't choose the libraries my company uses for things, or I certainly would not use this one.
I have code that generates these PDFs; now I am to add code that takes the contents of an existing PDF and inserts it into the PDF I'm creating.
I've found examples of how to do this, but they all use files. Except for the one I'm reading, I don't have files; I'm in a web application where I don't have easy access to a place to write a file.
Can't I open the existing PDF and somehow insert its entire content into the document I'm creating, without having to write to a file?
After I do this, I will have more content to add to the document, either from another file, dynamically created content, or both, so it isn't a simple merge of my content with one existing file. I also haven't created the existing file as its own entity, to be merged with another file, though I suppose I can do that IF it's necessary.
But I was hoping there was a way (or were ways) to do this without having to reorganize my existing code. It's possible the answer is implied in one of these examples, but they don't explain the concepts behind things, so I don't know where I can put input Streams instead of file input streams, output streams instead of file output streams, etc.
When I upload pdf file to cq5 I see following structure in my crx:
This structure looks strange for me. I don't understand why do I see png renditions here.
How can I use these renditions?
My current vision that these renditions couldn't be helpful. Thus I want to achieve that after uploading PDF files into DAM these renditions doesn't generate.
Can you provide steps for this?
after my changes in workflow:
before my changes:
update 2
I set dimensions follows:
but I see old result after pdf and jpg uploading
The purpose of these renditions is, as per their name, that they can be used to display thumbnails of the documents — e.g. you may want to display the front cover of each PDF if in a gallery section.
The thumbnail is created by the "DAM Update Asset" workflow (http://www.example.com/etc/workflow/models/dam/update_asset.html; until v5.6) in its Thumbnail creation step — I'm not sure that you can configure this to skip certain file types.
To get around this, you could remove this step and replace it with an Create Web Enabled Image step — this will allow you to specify MIME-types to skip over in its arguments panel:
Alternatively, you could write a bespoke Process class which would use ImageMagick to generate thumbnails but ignoring PDFs.
This question is related to another one I've posted recently: Check printing with Java/JSP
We're looking for alternatives to how we currently print checks in a Java web application via an applet. It seems the consensus is to use PDF for printing and that itext offers the ability to do so with Java.
However, it's important in our particular case that the checks are "print-only" - the user should not have any ability in the application to save the check (I know a savvy user could do a PrintScreen but we want to cover our rears and make no native functionality in the app to save checks).
I haven't been successful in browsing the web to find out if it's possible to create a PDF with itext in this manner. I have seen posts on restricting permissions in a PDF but what I'm really looking for is a way to disable the ability to save a PDF locally using itext.
Does this functionality exist? If so, could you point me to documentation/code samples on it?
I'm presuming that you're serving this PDF and wishing to print it from within a web application / web site where no out of the ordinary client side plug-ins are installed.
If printing the PDF using conventional means (e.g. Adobe Reader), the PDF MUST be downloaded to the browser's cache to be opened and printed. There is no way around that.
Now you can probably prevent the average Joe from saving the PDF locally via the following technique, but any savvy user will be able to inspect your HTML's source and download the PDF directly.
Output your PDF in iText such that when the PDF is opened, a print action automatically occurs
Put an invisible IFRAME on your HTML page which loads this PDF, but is not visible in the browser to your user
When the user loads your HTML page, the PDF will be loaded in the IFRAME and sent to the users printer (presuming that Adobe Reader is installed in the browser). Yes, the PDF will end up in the browser cache, but the user would have to be savvy enough to both recognize this and then hunt it down in their browser's cache.
If this is not acceptable, you're going to have to look at converting the PDF to another file type (e.g. pages are rendered to images displayed in the browser or perhaps a Flash / Java object that sends each page in the document to the printer directly)
The printWriter class gives some static variables for certain options: PrintWriter
And here is another SO post that might help: iText disable printing/Copying/Saving
I wrote a web app for generating PDF by filling data into a pre-saved PDF template, template edited by acrobat, with some text-fields. But the context of those text-fields seems in a different layer and cannot affect other existing words in template.
... But I want it affect the existing words and make them flow base on how many data fill into the text-fields.
The solution maybe use program to generate a whole PDF instead of using template. But the template changes really often in my case, I don't want waste a lot of time to adjust the position and format by coding...
Do anyone know how to use text-field with auto flow in a PDF template? just like a Word document.
PDF doesn't work like that. You need to generate the whole PDF.
Ah... but from what?
There are quite a few HTML->PDF converters out there. You could fill in your template HTML, and convert it that way.
You could develop your own input format (for your template), and write an app that reads it and builds a PDF.
The later is similar enough to HTML->PDF, that unless you can't find a converter that handles some PDF feature or other you need, I'd just go that route. There are LOTS of html->pdf apps out there. You can search SO, google, whatever. Lots.
We've got an application that displays PDF files in an IFrame at specific Named Destinations. This works well on Windows systems but not Mac. In Safari, with Acrobat, the Named Destination is ignored and the document is displayed at the start.
Does anyone have any suggestions on how we might accomplish the task of displaying this information? Our initial thoughts are to:
Convert the PDF to HTML on the fly and display the HTML version in the IFrame
Convert the PDF on the page referenced to another format such as PNG etc. and display that in the IFrame
Utilize some kind of Java app that allowed us to render the PDF while honouring the Named Destination (not sure if this exists)
Any other ideas on a potential method of better displaying PDF files at Named Destination points that is a little more cross platform?
EDIT: I guess another option is to store the data in XSL/XSLT type format and convert to HTML for veiwing or PDF for saving to the desktop.
Not much help, but I found that alternative ways to display PDF files (other than the Acrobat Reader client) are few and far between. As you say, the commonly accepted way to render PDF's in something that doesn't natively support it seems to be converting it "something else", which is supported (even Acrobat.com does it this way in their Flex client if I remember it correctly).
Even converting the PDF document to other formats may be disappointing - especially if you expect a certain level of quality. It may also introduce server-side performance issues.
I realise this doesn't help anyone much but I'm interested to see if any other suggestions come up. We've dealt with this problem before in the same way, using IFrame controls (but without named destinations) but I'm very much interested in other suggestions/ideas as well.