I am looking for a way to extract all resources links from an HTML page in Java. (URL links, links to files..)
I first thought of extracting all elements inside src, href attributes, but the list will not be exhaustive. There is an example of code here: Jsoup, extract links, images, from website. Exception on runtime.
As a tricky example, I want to be able to detect links hidden inside JavaScript (which can also be hidden anywhere in the HTML DOM):
<IMG onmouseover="window.open('http://www.evil.com/image.jpg')">
EDIT:
1) I am not looking for a regex-based solution because they are not reliable to deal with HTML document
2) I have tried to use Html DOM parser like JSoup. They allows the extractions of tags and their properties quite well. However I have not found a way to detect links inside JavaScript with it.
3) Maybe there is an API available that tries to render the page and detect which resources needs to be loaded?
Do you have any thoughts?
Thanks.
If you want to use PHP with a bit of programming knowledge here is a library.
http://simplehtmldom.sourceforge.net/
I used this library to extract info from tags, even from properties of tags. This is exactly what you need to do what you want without working with complicated code.
Related
I'm trying parse a website (f.e. google)
In Chrome local storage i see variables (key-value pairs)
And document content depends of this variables
Can i set it using jsoup?
Or I should use other tools for it?
No, you cannot access Chrome's content with your own code (unless you can find an exploit for that). You'll have to get the site's content with the proper get or post request made with jsoup and then parse the content by yourself. Just remember that jsoup only loads the HTML of the site, so if your content is loaded from JS, you'll have to find another way to get it.
I am creating a news app and have the url to the site of the articles e.g http://www.bbc.co.uk/news/technology-33379571 and I need a way to extract the content from the article.
I have tried jsoup but that gives all the html tags and there is one <main-article-body> but that gives the link to the article which I am trying to extract. I know boilerpipe does it exactly but that doesnt work with android, I am really stuck with this problem.
Any help will be much much appreciated
I have worked on few data extraction applications in.Net (c#) and have used regular expressions to extract content from news website.
The basic idea is to first extract all a href links (as needed) and then fetching details content by making web request. Finally using regular expressions to extract news body data.
Note: A problem with this process is that you will need to change your regular expressions when data source site changes.
I want to convert a HTML page into MS word. I want to know what API's will be helpful and also if there is any other option to do the same.
The entire page is to be converted into .doc (eg. If there is a table in the html page, a similar table must be created in the word doc) .
Apache POI does not provide an option to format the word document as in the HTML page.
I need something that can give me a completely formatted word document.
Some of the things that i seek are JSOUP, docx4j, jasper reports, and JOD Convertor.
I tried parsing the HTML page using JSOUP and I get the contents of
the page in my java program. Now I need to pass these contents to a
doc/docx file. Can docx4j be helpful to get a formatted docx file?
Please help.
Thank you.
I would go with Ashwini Raman's suggestion. It wont work with every scenario. In the case of a complex HTML document with many images and stuff word will not do a good job. But for most cases it should be fine. Otherwise, there is a complex task ahead of you. You will have to parse your HTML document using the jsoup library for example and then use the docx4j library to create your workd document.
Links to both are here:
http://www.docx4java.org/trac/docx4j
http://jsoup.org/
When you are doing it also, the formatting might be iffy.
To answer your original question, no there is no ready made library that does what you are expecting. At least I havent come across any.
I found a way round to do the same. First I need to get the parsed objects using JSOUP and pass these to a document template. I am now looking for the options that can provide me creating easy templates and creating the document dynamically.
I have asked another question regarding the same.
Is it a good idea? Well I have used other 3rd party Libraries like JSoup and it works great, but for this project it's different. Is it worth it to load and parse a whole document when you just want to get one item from it? Some of the html pages are simple too, so I could use String methods too. Reason is cause memory will be an issue, and it also takes some time to load the document too. When parsing XML I always use a SAX Parser because it doesn't load it in memory and it is fast. Could I use the same thing on html documents, or is there already one like this out there? So if there is a non-DOM HTML lightweight parser, that would be great too.
If the HTML is XML compliant (i.e. it's XHTML) then you can use a standard SAX parser. Here you can find a list of HTML parsers in Java to choose from: http://java-source.net/open-source/html-parsers. HotSax probably will handle all your use cases.
in my GWT application, on the client side I have a string containing html. Is there a good way to go about parsing that and finding specific html tags within it and returning the id's of those tags?
Any help would be much appreciated, thanks!
Check out GWT query. It is a jQuery like API for GWT that allows easily traversing and manipulating HTML.
You could attach your HTML string to the DOM - using Element.setInnerHTML(yourString). That way you're using the browser's parser. Attaching it to an invisible element or an invisible iframe should hide whats happening from the user.
For the querying you can use GWT's DOM functions if you want to stick with plain GWT. Using JavaScript directly or any JavaScript library like jQuery are also options. GWT query might also be an option, but I haven't used that yet.
UPDATE:
This approach can be abused by XSS (cross site scripting) attacks - so you must either trust or sanitize the HTML string.