I fetch the website using Jsoup. Here is the link to the web:
http://www.yelp.com/search?find_desc=restaurants&find_loc=westmont%2C+il&ns=1&ls=43131f934bb3adf3#find_loc=Hinsdale,+IL&l=p:IL:Hinsdale::&sortby=rating&unfold=1
Now I'm trying to extract the number of sub-pages on the web. For example the numbers next to "Go to Page" as shown in the picture below:
Unfortunately either 'view source' in the browser or Jsoup is not able to see these elements. I guess this content is embedded dynamically into the web. If so what is the best way to access dynamically generated web? Thanks.
For the website that use AJAX/JS Libraries technique to generate content, you may want to use HTMLUnit instead (HTMLUnit can simulate Javascript events). JSoup is only for static HTML, or things that you could receive via viewsource.
Related
I've wanted to write a crawler in java for some school exercise. Actually the crawler code, implemented with the jsoup lib, worked because the result of my request was some HTML code, but when I searched for a word which was clearly written on the website, it was not found, because some div's from the crawler where empty.
Then I recognized, that I got the same code as you can see when you navigate to the website and right-click -> 'view page source'.
When I compared the code to right-click -> 'inspect', the code was not the same as in 'view page source'.
Is there anything I could do to get the HTML code containing the full content?
requested URL: https://app.libertex.com/?lang=deu&_ga=2.222573595.1459393376.1568209606-1642141519.1566978579&_gac=1.53153498.1566978579.CjwKCAjwzJjrBRBvEiwA867byuxkXf35eSWyL2LJhLel3PRiGsSfvU6iLb00E21dQOkogLcx_z5G6hoCQgwQAvD_BwE
You can't get the right code with jsoup as this website loads content dynamically.
This webpage loads code dynamically, i.e. it loads the initial content and then executes other code to load the rest of the content. jsoup is merely an HTML parser, meaning that it can parse through the various content which it is given. It cannot execute Javascript or wait for external files to load.
To scrape a website like this, you probably need an automated browser of sorts. I personally use Selenium in Python for crawling websites which load dynamically.
I realize this looks like a duplicate question, but it's not!(as far as I know, and I've searched a lot...) So for the last few days I've been trying to get the HTML content of my whatsapp web application but using the input stream reader provided by java seems to not give me the full html code. The URL I'm using is just https://web.whatsapp.com/, which I suppose could be a problem, but there aren't any personal URLs as far as I'm aware. However, in developer tools using the element inspector I can easily access and read the DOM elements I'm interested in. I'm wondering if there's a way I can get this source directly using java/perl/python.
I'm also looking to do this as a learning project, so preferably would like to stay away from tools such as jsoup and such. Thanks!
You can use selenium.webdriver in python. Something like:
from selenium import webdriver
browser = webdriver.Firefox()
browser.get("https://web.whatsapp.com/")
html = browser.page_source
If you want to get your own whatsapp page, you should use selenium to log into the site before getting the page_source.
I can connect to most sites and get the HTML just fine but when trying to connect to a website where most of the content is generated after the initial page load with JavaScript, it does not get any of that data. Is there any way to do this with Jsoup or does it not support it?
JSoup has some basic connection handling included, but it is not a web browser. It excels at parsing static html content. It does not run any javascript, so you are out of luck. However, there are different options that you might follow:
You can analyze the page that you want to retrieve and find out how the content you are interested in gets loaded. Often it is not very hard to tap the original source of the loaded content and work with this. This approach has the benefit that you get what you want with no need of extra libraries and the retrieval will be fast.
You can use a (full) browser and automate the loading of the page. A very good tool for this is selenium webdriver in combination with the headless webkit browser phantomjs. This however requires extra software and extra libraries in your project and will run much much slower than the first solution.
The data I want is visible from the browser, but I can't find it from the html source code. I suspect the data was generated by scripts. I'd like to grad such kind of data. Is it possible using Jsoup? I'm aware Jsoup just does not execute Javascript.
Take this page for example, I'd like to grab all the colleges and schools under Academics -> COLLEGES & SCHOOLS.
If the dom content is generated via scripts or plugins, then you really should consider a scriptable browser like phantomjs. Then you can just write some javascript to extract the data.
I didn't check your link, and I assume you're looking for a general answer not specific to any page.
Does anybody know some open source tools to parse the html pages, filter the Ads,JS and etc to get title, text. Front end of my application is based on LAMP. So I needs to parse the html pages and storage them into Mysql. And populate front pages with these data.
I know some tools: Heritrix, Nutch. But it seems that they are crawlers.
Thanks.
Joseph
It depends on what you mean by "text" from the webpage. I did a similar thing by grabbing a webpage using the apache HttpClient libraries and then dom4j to look for a particular tag to extract text from. But you do in effect need the same type of crawler that search engines like google use. You are emulating the basic steps that they do when they crawl a website. Extracting the information. It would be helpful if you went into a little more detail on what kind of information you want to retrieve from the pages.