Data Extraction from HTML in Java

Extract Data and Resources from Web Pages

Web pages often include linked files, embedded images, SVG graphics, and other resources that developers need to collect for reporting, migration, archiving, or automated content processing. With Aspose.HTML for Java , you can load HTML from a file or URL, inspect the document tree, find the required elements, resolve resource links, and save extracted data locally.

The API exposes an HTML DOM model and network operations, so Java applications can query elements, read attributes such as src and href, and download referenced resources. This makes Aspose.HTML useful for controlled web scraping, content extraction workflows, and automated processing of HTML-based documents.

How HTML Data Extraction Works

A typical extraction workflow starts by loading an HTML document with HTMLDocument. Then you select elements by tag name or DOM navigation, read attributes such as href or src, and save the extracted values or downloaded resources to an output folder. The example below extracts all links from a web page and writes them to a text file.

import com.aspose.html.HTMLDocument;
import com.aspose.html.collections.HTMLCollection;
import com.aspose.html.dom.Element;

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

String outputDir = "output/";
new File(outputDir).mkdirs();

// Extract links from HTML using Java
try (HTMLDocument document = new HTMLDocument("https://docs.aspose.com/html/java/")) {
    HTMLCollection links = document.getElementsByTagName("a");

    try (FileWriter writer = new FileWriter(outputDir + "links.txt")) {
        for (Element link : links) {
            String href = link.getAttribute("href");
            if (href != null && !href.isEmpty()) {
                writer.write(href + System.lineSeparator());
            }
        }
    }
}

Steps to Extract Data from HTML

1. Load an HTML document from a file or URL using the HTMLDocument class.
2. Select the required elements, such as links, images, or SVG references.
3. Read element attributes, for example href or src.
4. Resolve URLs when a resource is referenced by a relative path.
5. Save the extracted data or downloaded resources to a local output folder.

Explore focused Java examples for extracting resources from HTML pages, including image downloads, SVG extraction, and saving files from direct URLs.

Get Started with Aspose.HTML for Java Library

Aspose.HTML for Java is an advanced web scraping and HTML parsing library. One can create, edit, navigate through nodes, extract data and convert HTML, XHTML, and MHTML files to PDF, Images, and other formats. Moreover, it also handles CSS, HTML Canvas, SVG, XPath, and JavaScript out-of-the-box to extend manipulation tasks. It’s a standalone API and does not require any software installation.
You can download its latest version directly from Aspose Maven Repository and install it within your Maven-based project by adding the following configurations to the pom.xml.

<repository>
<id>AsposeJavaAPI</id>
<name>Aspose Java API</name>
<url>https://repository.aspose.com/repo/</url>
</repository>

<dependency>
<groupId>com.aspose</groupId>
<artifactId>aspose-html</artifactId>
<version>version of aspose-html API</version>
<classifier>jdk17</classifier>
</dependency>