How to View Source Code in HtmlUnit?

How can I use HtmlUnit to view the source code of a webpage?

HtmlUnit is a popular browser emulator for Java that allows developers to programmatically interact with web pages. One of its useful features is the ability to fetch and view the source code of a webpage, making it a powerful tool for web scraping and automated testing.

import com.gargoylesoftware.htmlunit.WebClient;  
import com.gargoylesoftware.htmlunit.html.HtmlPage;  

public class HtmlUnitExample {  
    public static void main(String[] args) {  
        try (final WebClient webClient = new WebClient()) {  
            // Disable CSS and JavaScript to speed up the loading  
            webClient.getOptions().setJavaScriptEnabled(false);  
            webClient.getOptions().setCssEnabled(false);  

            // Load the desired webpage  
            HtmlPage page = webClient.getPage("http://example.com");  
            // Get the page source  
            String pageSource = page.asXml();  
            System.out.println(pageSource);  
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
}

Causes

• User may not have the correct HtmlUnit version installed.
• Network issues might prevent successful page loading.
• Incorrect URL leading to an error when fetching the source code.

Solutions

• Ensure you are using the latest version of HtmlUnit to benefit from all features and fixes.
• Check your internet connection and ensure the target URL is accessible.
• Use the correct methods to load the webpage and then retrieve its source.

Mistake: Not disabling JavaScript and CSS, which slows down loading.

Solution: Use `webClient.getOptions().setJavaScriptEnabled(false);` and `webClient.getOptions().setCssEnabled(false);`.

Mistake: Failing to handle exceptions when fetching the page.

Solution: Wrap your code in try-catch blocks to gracefully handle possible network errors.

Mistake: Trying to fetch a page that doesn't exist or is inaccessible.

Solution: Ensure the URL is correct and accessible from your network.