This guide explains how to parse HTML with jsoup
in Java. You will learn how to use DOM methods, handle pagination, and optimize your parsing workflow.
This tutorial assumes using Maven for dependency management.
Once you’ve got Maven installed, create a new Java project called jsoup-scraper
:
mvn archetype:generate -DgroupId=com.example -DartifactId=jsoup-scraper -DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=false
To add relevant dependencies, replace the code in pom.xml
with the code below:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>jsoup-scraper</artifactId>
<packaging>jar</packaging>
<version>1.0-SNAPSHOT</version>
<name>jsoup-scraper</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.jsoup</groupId>
<artifactId>jsoup</artifactId>
<version>1.16.1</version>
</dependency>
</dependencies>
<properties>
<maven.compiler.source>17</maven.compiler.source>
<maven.compiler.target>17</maven.compiler.target>
</properties>
</project>
Now paste the below code into App.java
:
package com.example;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
public class App {
public static void main(String[] args) {
String url = "https://books.toscrape.com";
int pageCount = 1;
while (pageCount <= 1) {
try {
System.out.println("---------------------PAGE "+pageCount+"--------------------------");
//connect to a website and get its HTML
Document doc = Jsoup.connect(url).get();
//print the title
System.out.println("Page Title: " + doc.title());
} catch (Exception e) {
e.printStackTrace();
}
}
System.out.println("Total pages scraped: "+(pageCount-1));
}
}
Jsoup.connect("https://books.toscrape.com").get()
: This line fetches the page and returns aDocument
object that you can manipulate.doc.title()
returns the title in the HTML document, in this case:All products | Books to Scrape - Sandbox
.
jsoup
contains a variety of methods for finding elements in the DOM(Document Object Model). We can use any of the following to find page elements easily.
getElementById()
: Find an element using itsid
.getElementsByClass()
: Find all elements using their CSS class.getElementsByTag()
: Find all elements using their HTML tag.getElementsByAttribute()
: Find all elements containing a certain attribute.
On the website we are scraping, the sidebar contains a div
with an id
of promotions_left
:
//get by Id
Element sidebar = doc.getElementById("promotions_left");
System.out.println("Sidebar: " + sidebar);
This code outputs the HTML element you see in the Inspect page.
Sidebar: <div id="promotions_left">
</div>
getElementsByTag()
allows to find all elements on the page with a certain tag. On this page, where each book is contained in a unique article
tag:
The code below returns an array of books that will provide the foundation for the rest of the data.
//get by tag
Elements books = doc.getElementsByTag("article");
Let's inspect the price of a book. The class is price_color
:
The below code snippet finds all elements of the price_color
class and prints the text of the first one using .first().text()
:
System.out.println("Price: " + book.getElementsByClass("price_color").first().text());
Let's use getElementsByAttribute("href")
to find all elements with an href
attribute:
//get by attribute
Elements hrefs = book.getElementsByAttribute("href");
System.out.println("Link: https://books.toscrape.com/" + hrefs.first().attr("href"));
To find elements by multiple criteria, let's pass CSS selectors to the select()
method. This will return an array of all objects matching the selector. In the next code snippet, we use li[class='next']
to find all li
items with the next
class:
Elements nextPage = doc.select("li[class='next']");
To handle pagination, we start by using nextPage.first()
to obtain the first element from the array. We then call getElementsByAttribute("href").attr("href")
on that element to extract its href
value.
Since after page 2, the word catalogue
is removed from the links, we add href
back if does not contain catalogue
. After that, we combine this updated link with our base URL to obtain the URL for the next page.
if (!nextPage.isEmpty()) {
String nextUrl = nextPage.first().getElementsByAttribute("href").attr("href");
if (!nextUrl.contains("catalogue")) {
nextUrl = "catalogue/"+nextUrl;
}
url = "https://books.toscrape.com/" + nextUrl;
pageCount++;
}
Here is the final Java code. To scrape more than one page, simply change the 1
in while (pageCount <= 1)
. E.g., if you want to scrape 4 pages, use while (pageCount <= 4)
.
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
public class App {
public static void main(String[] args) {
String url = "https://books.toscrape.com";
int pageCount = 1;
while (pageCount <= 1) {
try {
System.out.println("---------------------PAGE "+pageCount+"--------------------------");
//connect to a website and get its HTML
Document doc = Jsoup.connect(url).get();
//print the title
System.out.println("Page Title: " + doc.title());
//get by Id
Element sidebar = doc.getElementById("promotions_left");
System.out.println("Sidebar: " + sidebar);
//get by tag
Elements books = doc.getElementsByTag("article");
for (Element book : books) {
System.out.println("------Book------");
System.out.println("Title: " + book.getElementsByTag("img").first().attr("alt"));
System.out.println("Price: " + book.getElementsByClass("price_color").first().text());
System.out.println("Availability: " + book.getElementsByClass("instock availability").first().text());
//get by attribute
Elements hrefs = book.getElementsByAttribute("href");
System.out.println("Link: https://books.toscrape.com/" + hrefs.first().attr("href"));
}
//find the next button using its CSS selector
Elements nextPage = doc.select("li[class='next']");
if (!nextPage.isEmpty()) {
String nextUrl = nextPage.first().getElementsByAttribute("href").attr("href");
if (!nextUrl.contains("catalogue")) {
nextUrl = "catalogue/"+nextUrl;
}
url = "https://books.toscrape.com/" + nextUrl;
pageCount++;
}
} catch (Exception e) {
e.printStackTrace();
}
}
System.out.println("Total pages scraped: "+(pageCount-1));
}
}
Compile the code:
mvn package
Now you can run it:
mvn exec:java -Dexec.mainClass="com.example.App"
Here is the output from the first page.
---------------------PAGE 1--------------------------
Page Title: All products | Books to Scrape - Sandbox
Sidebar: <div id="promotions_left">
</div>
------Book------
Title: A Light in the Attic
Price: £51.77
Availability: In stock
Link: https://books.toscrape.com/catalogue/a-light-in-the-attic_1000/index.html
------Book------
Title: Tipping the Velvet
Price: £53.74
Availability: In stock
Link: https://books.toscrape.com/catalogue/tipping-the-velvet_999/index.html
------Book------
Title: Soumission
Price: £50.10
Availability: In stock
Link: https://books.toscrape.com/catalogue/soumission_998/index.html
------Book------
Title: Sharp Objects
Price: £47.82
Availability: In stock
Link: https://books.toscrape.com/catalogue/sharp-objects_997/index.html
------Book------
Title: Sapiens: A Brief History of Humankind
Price: £54.23
Availability: In stock
Link: https://books.toscrape.com/catalogue/sapiens-a-brief-history-of-humankind_996/index.html
------Book------
Title: The Requiem Red
Price: £22.65
Availability: In stock
Link: https://books.toscrape.com/catalogue/the-requiem-red_995/index.html
------Book------
Title: The Dirty Little Secrets of Getting Your Dream Job
Price: £33.34
Availability: In stock
Link: https://books.toscrape.com/catalogue/the-dirty-little-secrets-of-getting-your-dream-job_994/index.html
------Book------
Title: The Coming Woman: A Novel Based on the Life of the Infamous Feminist, Victoria Woodhull
Price: £17.93
Availability: In stock
Link: https://books.toscrape.com/catalogue/the-coming-woman-a-novel-based-on-the-life-of-the-infamous-feminist-victoria-woodhull_993/index.html
------Book------
Title: The Boys in the Boat: Nine Americans and Their Epic Quest for Gold at the 1936 Berlin Olympics
Price: £22.60
Availability: In stock
Link: https://books.toscrape.com/catalogue/the-boys-in-the-boat-nine-americans-and-their-epic-quest-for-gold-at-the-1936-berlin-olympics_992/index.html
------Book------
Title: The Black Maria
Price: £52.15
Availability: In stock
Link: https://books.toscrape.com/catalogue/the-black-maria_991/index.html
------Book------
Title: Starving Hearts (Triangular Trade Trilogy, #1)
Price: £13.99
Availability: In stock
Link: https://books.toscrape.com/catalogue/starving-hearts-triangular-trade-trilogy-1_990/index.html
------Book------
Title: Shakespeare's Sonnets
Price: £20.66
Availability: In stock
Link: https://books.toscrape.com/catalogue/shakespeares-sonnets_989/index.html
------Book------
Title: Set Me Free
Price: £17.46
Availability: In stock
Link: https://books.toscrape.com/catalogue/set-me-free_988/index.html
------Book------
Title: Scott Pilgrim's Precious Little Life (Scott Pilgrim #1)
Price: £52.29
Availability: In stock
Link: https://books.toscrape.com/catalogue/scott-pilgrims-precious-little-life-scott-pilgrim-1_987/index.html
------Book------
Title: Rip it Up and Start Again
Price: £35.02
Availability: In stock
Link: https://books.toscrape.com/catalogue/rip-it-up-and-start-again_986/index.html
------Book------
Title: Our Band Could Be Your Life: Scenes from the American Indie Underground, 1981-1991
Price: £57.25
Availability: In stock
Link: https://books.toscrape.com/catalogue/our-band-could-be-your-life-scenes-from-the-american-indie-underground-1981-1991_985/index.html
------Book------
Title: Olio
Price: £23.88
Availability: In stock
Link: https://books.toscrape.com/catalogue/olio_984/index.html
------Book------
Title: Mesaerion: The Best Science Fiction Stories 1800-1849
Price: £37.59
Availability: In stock
Link: https://books.toscrape.com/catalogue/mesaerion-the-best-science-fiction-stories-1800-1849_983/index.html
------Book------
Title: Libertarianism for Beginners
Price: £51.33
Availability: In stock
Link: https://books.toscrape.com/catalogue/libertarianism-for-beginners_982/index.html
------Book------
Title: It's Only the Himalayas
Price: £45.17
Availability: In stock
Link: https://books.toscrape.com/catalogue/its-only-the-himalayas_981/index.html
Total pages scraped: 1
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