How to extract PDF file content in java completely as Text and render as HTML?
Not like extracting just text separately or just images separately, requirement is to display contents of PDF file (as like original file-means including images and tables right at place where it was in original file) as HTML content.
Some how same like the sample in the answer here Convert Word to HTML with Apache POI which extracts contents of MS Doc file into HTML using Apache POI.
Extracting data from a PDF file is fairly simple. There are multiple libraries out there that do it correctly. Extracting data, and preserving its layout, on the other hand (the workflow the OP describes) is a very difficult process. The reason behind it is simple - most* PDF files, don't really have any elements that define structure. When a PDF file, for example, displays a table, it's very easy for humans to see it, and understand this is indeed a table with some data in it. However, in the PDF file itself, this is a collection of vector lines, and some text runs in between. The PDF itself, or the PDF viewer, are not aware that this is a table. Therefore when this data is converted to HTML, we don't know that we need to draw a table, but instead see this as vector art. This is just one example of why this is difficult. There are many others that can be used to illustrate this point.
On the other hand, such a thing exists as "Tagged PDF" (section 10.7). It's a PDF where structure elements are actually defined, and extraction is fairly easy. However tagged PDF files are not as common as we would like, and in most cases you won't be guaranteed to work with one.
There are some tools on the market that use sophisticated logic to infer the structure of an untagged document. Some of them do a better job than others at this. I've worked with Adobe Acrobat, which does a decent job at creating an HTML file. There is also an offering from Datalogics (I work for Datalogics) called PDF Alchemist which converts PDF to HTML. Both of them are commercial solutions.
If you are looking for a free solution, PDFBox does a good job at extracting content from a PDF document. However, it doesn't have the ability to create an HTML file, and this is something that will have to be implemented outside of the library. I'm not aware of any free PDF to HTML solutions that do a good enough job, and I would be willing to recommend.
Related
I have the Data.xml file and a pdf file filled with informations. I'm trying to embed the data.xml file in the XMP metadata stream of the PDF because this data should be hidden.
I used iText to create the pdf and to add the usual metadata such as author etc. But I'm not able to understand how to add the xml as metadata in the xmp stream. Is there a function in the iText or xmlworker library that allows me to do this? I've tried but I can't fin the way to do this.
(I have no code to post because all code written to create the pdf and so on works perfectly, just dunno how to proceed to do what I described before. Is there something in the iText library that provides it, or i should use other tools?)
"In PDF/A-3, the data is added as a document-level attachment. That makes much more sense than to put it into an XMP stream.
The document-level attachment won't be visible on any page, but people will be able to select it in the attachment panel, just like they'll be able to see the contents of the XMP (it's easy to add a document-level attachment with iText). There are of course many other ways to add data to a PDF that isn't visible. For instance Adobe Illustrator adds proprietary artifacts as a /PieceInfo entry in the root dictionary of the PDF. That's also possible with iText. There are many solutions, all are better than abusing the XMP stream"
Attaching at the document level solved the problem.
I am new to java, I have to read a PDF, Open Office or MS Word file and make changes in the file and render as PDF document on my web page. Please someone tell me which of these file's API or SDK is easy to use and also tell me best SDK for this. So I can read, Update and render easily. file also contains Table but there is no image.
We use Apache POI to read Microsoft Office files. There are many libraries for PDF in Java. iText is something I have used. Once you pick the tools, do a selective search on Stack Overflow. There are plenty of discussions around these tools.
Depending on the types of updates you are doing, modifying PDF is going to be a problem - it's not intended for editing. You might have to find some way of converting the PDF to something first, then edit. Depending on the types of changes you want to make and the documents you are working from even editing DOC and Writer files is going to be tricky. They are all different formats.
As Jayan mentioned, iText and POI may help you a little. OpenOffice Writer documents can be edited by unzipping then modifying the XML or using the UNO API. Word documents can be editied by using MS Office automation (bad idea), converting to OpenOffice first then editing, or if DOCX, unzipping and processing the XML.
Good luck.
I want to download an HTML page, extract some used full text out of this HTML and convert the HTML to PDF then store the useful text and PDF in a noSQL solution.
What is the most efficient way to pass the HTML to the modules which extract useful text and the module which creates the PDF. I don't want to download the same HTML twice.
One way to store the HTML is to download the HTML to a local disk under a unique named folder and pass the path to other modules so that they can process the HTML.
This approach doesn't looks that good to me, as there is implementation overhead.
I would love to see the entire HTML as a single variable so I can give it to other modules so they can traverse the HTML without loading it. One idea that crossed my mind is to download and zip the HTML and related code/pics then store the binary in a byte[].
I haven't used these before but a quick Type search on eclipse with the text html gave me this:
Class HTMLDocument
From the docs :
A document that models HTML. The purpose of this model is to support both browsing and editing
I generate a html file using log4j WriterAppender file. I also takesnapshots of my screen using webdriver. Now I wish to append them together.
Any idea how to do that?
Thanks!
Apologies for not being clear and daft. My situation is that I have got a html file which is generated dynamically by my logger class and then there are some .png file which are also being created dynamically. Now I want them to appear together in one file. Am I clear now? Please ask for more information if needed
It's possible to embed graphics data in a couple of ways. Most modern browsers accept the data: url notation. An image can be embedded straight into a url.
I took an example from this site. Cut and paste the whole line into the url bar:
data:image/gif;base64,R0lGODlhEAAOALMAAOazToeHh0tLS/7LZv/0jvb29t/f3//Ub//ge8WSLf/rhf/3kdbW1mxsbP//mf///yH5BAAAAAAALAAAAAAQAA4AAARe8L1Ekyky67QZ1hLnjM5UUde0ECwLJoExKcppV0aCcGCmTIHEIUEqjgaORCMxIC6e0CcguWw6aFjsVMkkIr7g77ZKPJjPZqIyd7sJAgVGoEGv2xsBxqNgYPj/gAwXEQA7
You should see a folder graphic. Some older browsers don't accept this, and some such as IE8 restrict content in various ways, to static content for security reasons.
The second way of doing the same is for the server to serve multi-part MIME. Basically a server would shove out a multi-part mime document consisting of the HTML body and then any inline images base64 encoded as separate parts. This is more suitable for email HTML although it might work through a web browser.
It's not quite clear what you're asking here, but let's assume that you want to manually add an image to the log output HTML file.
If you want to include an image in your HTML file, just save the snapshot PNG file in a place relative to where the HTML is generated, then include it using standard HTML syntax:
<img src="images/snapshot.png" alt="snapshot description">
Update: the requirement is to add dynamically generated PNG files to a dynamically created HTML log file.
If one process is creating both the PNG and the log output, you should be fine - just keep note of the appropriate PNG filename and include it in the logger output in an IMG tag (as described above).
If they are generated by separate processes, this may be more difficult; you would need to either stick to a known naming convention, have the process generating the log query the filesystem to determine the appropriate PNG file to include, or build some sort of message-passing between the two processes.
Please stop posting the same comment to each and any of the different answers given to you, when all of those answers basically tell you that the notion of concatenating two different file formats into a single file is not meaningful.
Let me repeat that again for clarity: Copying a PNG file into a HTML document makes no sense.
You either save the PNG in a directory where it's accessible in the HTML document and add an img tag so it can be referenced (see the answer by stark), which would be the recommended way in terms of portability and usage of the files as they were intended to be used.
If you really, really want to end up with a single file for whatever reasons, there are bascially two options: You follow the advice of locka and encode the PNG image with Base64 and insert an img tag with a data URI at a meaningful position. This probably involves parsing the HTML "a little" to come up with a good place to insert it.
The other option is to not create HTML, but MHTML files. MHTML is a file format that allows saving HTML source code and resources like images into a single file. MHTML is supported by the most popular browsers nowadays, you may find info on the file format here: http://people.dsv.su.se/~jpalme/ietf/mhtml.html
In the code where you are generating the html you should just include the img using the img html tag
If you want the picture to appear in the html, add the tag
<img src=./img.png /> to your html.
If you want the 2 files in one, you'll need to zip them into an archive or something?
It makes no sense to append a HTML file to a PNG file, or vice-versa. Neither file format allows this, so if you do this you will end up with a "corrupt" document that a typical web browser or image viewer won't understand.
"I want them to appear together in one file".
That's still pretty vague, I'm afraid.
Assuming that you want the image to appear embedded in the HTML document when you open the HTML document in a browser, the simple solution is create separate HTML and PNG files, and have the HTML file link to the PNG file using an <img> element.
If you want, you can bundle up the files (and others) as a ZIP or TAR file, so that you can deliver everything as a single file. However, a ZIP/TAR file typically needs to be extracted before the document can be viewed. (A typical web browser won't "display" a ZIP file. Rather it will open it in some kind of archive extractor or directory browser, allowing the user to access the individual files.)
It might also be possible to embed an image file in a HTML file by base64 encoding the image, and using embedded javascript to decode the image and then insert it into the DOM ... But this is probably waaay to complicated.
Is there any free Java library for extracting text from PDF, that is compatible with Google Application Engine?
I've read about PDFJet, but it can't read PDF, can it?
Is there perhaps other way how to extract text from PDF? I tried http://www.pdfdownload.org/, unfortunately they don't handle non-English characters correctly.
iText now has a text parsing module (I'm one of the parser authors). See the com.itextpdf.text.pdf.parser.PdfContentReaderTool class for an example of how to use it.
PdfBox does not run on GAE. It uses not-allowed java classes.
(GAE only permits these http://code.google.com/appengine/docs/java/jrewhitelist.html)
I have partially modified a very old version of PdfBox (0.7.3) to be GAE complaiant. Now I'm able to extract text from PDF (whole page or rectangular area). I only modified a minumum part of the pdf text extraction and not the whole PdfBox. :)
The idea was to remove refences to java.awt.retangle & C. using my own "rectangle" class.
More info: http://fhtino.blogspot.com/2010/04/pdfbox-text-extration-gae.html
I modified the latest (1.8.0-Snapshot) version to run on Google AppEngine. Had to disable one Unit-Test, but it runs fine for simple text extraction.
Following the simple try-fail-fix approach i had to modify 5 files in total. Pretty doable.
You'll also have to explicitly use a RandomAccessBuffer, like Fabrizio explained.
For the extra lazy, heres the compiled jar, dependencies for text extraction, and the patch. Note that it might not work for every usecase (i.e. rectangle based extraction). Used it to extract text of a whole page.
https://docs.google.com/folder/d/0B53n_gP2oU6iVjhOOVBNZHk0a0E/edit
I know there is http://pdfbox.apache.org/index.html
Apache PDFBox is an open source Java
PDF library for working with PDF
documents. This project allows
creation of new PDF documents,
manipulation of existing documents and
the ability to extract content from
documents.
but I've never tested it.
Last month, I'd just finished extracting text from pdf file in my project. I used XPDF tool for getting text, and text coordinates, but I used it in Xcode (Objective-C). This tool was open source, written by C++, and able to be encoded in many language. However, I didn't know whether XPdf would be work on your java, or not. Anyway, You can try this tool.