Htmlunit Web Scraping
Web Scraping with Java using HTMLUnit – Stack Overflow
I am trying to web scrape
Here is my code
What I am trying to use is tByXPath(“//caption[@class=’standings__header’]/span”)
Which should pull back Eastern Conference and Western Conference but instead it pulls back nothing I don’t understand if my Xpath is wrong?
package Standings;
import bind. ObjectMapper;
import mlunit. WebClient;
import;
public class Standings {
private static final String baseUrl = “;
public static void main(String[] args) {
WebClient client = new WebClient();
tOptions(). setJavaScriptEnabled(false);
tOptions(). setCssEnabled(false);
tOptions(). setUseInsecureSSL(true);
String jsonString = “”;
ObjectMapper mapper = new ObjectMapper();
try {
HtmlPage page = tPage(baseUrl);
(());
tByXPath(“//caption[@class=’standings__header’]/span”)} catch (IOException e) {
intStackTrace();}}}
asked Dec 29 ’18 at 4:56
Have used this code to verify your problem:
public static void main(String[] args) throws IOException {
final String url = “;
try (final WebClient webClient = new WebClient()) {
tOptions(). setThrowExceptionOnScriptError(false);
HtmlPage page = tPage(url);
webClient. waitForBackgroundJavaScript(10000);
(());}}
When running this i got a bunch of warning and errors in the log.
(BTW: the page produces also many error/warnings when running with real browsers. Seems the maintainer of the page has a interesting view on quality)
I guess the problematic error is this one
TypeError: Cannot modify readonly property: constructor. ()
There is a known bug in the javascript support of HtmlUnit (). Because the bug is thrown from i guess this will stop the processing of the page javascript before the content you are looking for is generated.
So far i found no time to fix this (looks like this has to be fixed in Rhino) but this one is on the list.
Have a look at to get informed about updates.
answered Jan 11 ’19 at 17:58
RBRiRBRi1, 9752 gold badges9 silver badges11 bronze badges
2
The page you are trying to scrape needs Javascript to display properly. If you disable it, most of the elements won’t load.
Changing the line
to
tOptions(). setJavaScriptEnabled(true);
should do the trick
answered Jan 9 ’19 at 19:54
DSantiagoBCDSantiagoBC4122 silver badges9 bronze badges
Not the answer you’re looking for? Browse other questions tagged java web-scraping htmlunit or ask your own question.
How to write a screen scraper application with HtmlUnit – The …
I recently published an article on screen scraping with Java, and a few Twitter followers pondered why I used JSoup instead of the popular, browser-less web testing framework HtmlUnit. I didn’t have a specific reason, so I decided to reproduce the exact same screen scraper application tutorial with HtmlUnit instead of JSoup.
The original tutorial simply pulled a few pieces of information from the GitHub interview questions article I wrote. It pulled the page title, the author name and a list of all the links on the page. This tutorial will do the exact same thing, just differently.
HtmlUnit Maven POM entries
The first step to use HtmlUnit is to create a Maven-based project and add the appropriate GAV to the dependencies section of the POM file. Here’s an example of a complete Maven POM file with the HtmlUnit GAV included in the dependencies.
Java Web Scraping – Comprehensive Tutorial – Zenscrape
Christoph Leitner
Published: September 14, 2020 · 6 minutes read The World Wide Web is full of a wide variety of useful data for human consumption. However, this information is usually difficult to access programmatically, especially if it does not come as RSS feeds, APIs, or other formats. With Java libraries like jsoup and HtmlUnit, you can easily harvest and parse this information from web pages and integrate them into your specific use case—such as for recording statistics, analytical purposes, or providing a service that uses third-party this article, we’re going to talk about how to perform web scraping using the Java programming language. What you’ll needWeb browserWeb page to extract data fromJava development environmentjsoupHtmlUnitWhat we’ll coverUsing jsoup for web scrapingUsing HtmlUnit for web scrapingReady? Let’s get going…In this post, we’ll take a look at:Using jsoup for web scraping1. Setting up jsoup2. Fetching the web page3. Selecting the page’s elements4. Iterating and extracting5. Adding proxiesWrapping upUsing HtmlUnit for java web scraping1. Setting up HtmlUnit4. Fetching the web page5. Selecting the page’s elements6. Iterating and extracting7. Adding proxiesJava Web Scraping – Wrapping upConclusionUsing jsoup for web scrapingjsoup is a popular Java-based HTML parser for manipulating and scraping data from web pages. The library is designed to work with real-world HTML, while implementing the best of HTML5 DOM (Document Object Model) methods and CSS selectors. It parses HTML just like any modern web browse does. So, you can use it to:Extract and parse HTML from a string, file, or and harvest web information, using CSS selectors or DOM traversal nipulate and edit the contents of a web page, including HTML elements, text, and a clean HTML of a web pageHere are the steps to follow on how to use jsoup for web scraping in is a popular Java-based HTML parser for manipulating and scraping data from web pages. So, you can use it to:Extract and parse HTML from a string, file, or and harvest web information, using CSS selectors or DOM traversal nipulate and edit the contents of a web page, including HTML elements, text, and a clean HTML of a web pageHere are the steps to follow on how to use jsoup for web scraping in Java. 1. Setting up jsoupLet’s start by installing jsoup on our Java work can use any of the following two ways to install jsoup:Download and install the file from its website the jsoup Maven dependency to set it up without having to download anything. You’ll need to add the following code to your file, in the
tProperty(“oxyPassword”, “
Link: Text: Tips
Link: Text: Reviews
Link: Text: Shop
Link: Text: Home
Link: worked! Using HtmlUnit for java web scrapingWhile jsoup is great for web scraping in Java, it does not support JavaScript. So, it may not yield the desired results if you use it to scrape a web page with dynamic content or content added to the page after the page has erefore, if you want to extract data from a dynamic website, HtmlUnit may be a good alternative. HtmlUnit is a Java-based headless web browser that comes with several functionalities for manipulating websites, invoking pages, and completing other tasks—just like a normal browser are the steps to follow on how to use HtmlUnit for web scraping in Java. 1. Setting up HtmlUnitYou can use any of the following two methods to install HtmlUnit on your Java work environment:Download and install the HtmlUnit files from the HtmlUnit Maven dependency to set it up without having to download anything. You’ll need to add the following code to your file, in the
tOptions(). setThrowExceptionOnScriptError(false);4. Fetching the web pageFor this HtmlUnit tutorial, we’ll be seeking to extract the posts’ headings on this Reddit page, which uses JavaScript for dynamically rendering content. Here is the syntax for fetching the page:HtmlPage page = tPage(“);5. Selecting the page’s elementsAfter referencing an HTMLPage, let’s use a CSS selector to find the headings of the posts. If we use the inspector tool on the Chrome web browser, we see that each post is enclosed in an h3 tag and a _eYtD2XCVieq6emjKBH3m class:6. Iterating and extractingLastly, after selecting the headings, it’s now time to iterate and extract their content. Here is the code that runs through each heading on the target web page and outputs their content to the console:for (DomNode content: headings) {
(());} 7. Adding proxiesOptionally, you can use HtmlUnit to implement a proxy server and evade anti-scraping measures instituted by most popular set up a proxy server using HtmlUnit, pass it as an argument in the WebClient constructor:WebClient webClient = new WebClient(, “myproxyserver”, myproxyport));
//set proxy username and password
DefaultCredentialsProvider credentialsProvider = (DefaultCredentialsProvider) tCredentialsProvider();
dCredentials(“insert_username”, “insert_password”);Java Web Scraping – Wrapping upHere is the entire code for using HtmlUnit for scraping the content of a web page in Java:Scraping streets names from a map
AutoScraper: A Smart Automatic Web Scraper for Python
I need to scrape tons of data. Are proxies the unique and best way to avoid ban (e. g. from social media)? If yes, how can I get anonymous, safe, responsive ones?
How to identify which xhr item is responsible for a particular data?
Telegram scraping
Best Proxies for Web Scraping 2020
The A-Z of Web Scraping in 2020 [A How-To Guide]It worked! ConclusionThat’s how to carry out web scraping in Java using either jsoup or HtmlUnit. You can use the tools to extract data from web pages and incorporate them into your applications. In this article, we just scratched the surface of what’s possible with these tools. If you want to create something advanced, you can check their documentation and immerse yourself deeply into them. This tutorial is only for demonstration purposes.
