cdp4j - Chrome DevTools Protocol for Java
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README.md

IMPORTANT!

I'm sorry to say that I can no longer provide the cdp4j at no charge. The WebFolder OÜ open source effort has been cross-financed by our consulting services and product revenues in the past. But as a one-man-company I cannot justify the time and quite high costs for maintenance, for shaping quality APIs, writing docs, providing example sources, and a huge bulk of work to keep the cdp4j up-to-date.

We will still improve and support the cdp4j but for only Commercial License customers.

cdp4j - Chrome DevTools Protocol for Java

cdp4j is a web-automation library for Java. It can be used for automating the use of web pages and for testing web pages. It use Google Chrome DevTools Protocol to automate Chrome/Chromium based browsers.

Features

  • Supports full capabilities of the Chrome DevTools Protocol (tip-of-tree)
  • Evaluate JavaScript
  • Invoke JavaScript function
  • Supports native CSS selector engine
  • Supports XPath queries
  • Incognito Browsing (private tab)
  • Full page screen capture
  • Trigger Mouse events (click etc...)
  • Send keys (text, tab, enter etc...)
  • Redirect log entries (javascript, network, storage etc...) from browser to slf4j
  • Intercept Network (request & response)
  • Upload file programmatically without third party solutions (does not requires AWT Robot etc...)
  • get & set Element properties
  • Supports Headless Chrome/Chromium
  • Navigate back, forward, stop, reload
  • clear cache, clear cookies, list cookies
  • set & get values of form elements
  • Supports event handling

Supported Java Versions

Oracle & OpenJDK Java 8, 9 & 10.

Both the JRE and the JDK are suitable for use with this library.

Licensing

cdp4j is licensed as cdp4j Commercial License.

It's illegal to use cdp4j without having a commercial license.

cdp4j IS NOT A FREE SOFTWARE. Buying a license is mandatory as soon as you develop commercial activities distributing the cdp4j inside your product or deploying it on a network.

Stability

This library is suitable for use in production systems.

Integration with Maven

To use the official release of cdp4j, please use the following snippet in your pom.xml file.

Add the following to your POM's <dependencies> tag:

<dependency>
    <groupId>io.webfolder</groupId>
    <artifactId>cdp4j</artifactId>
    <version>3.0.6</version>
</dependency>

Using development (SNAPSHOT) version:

<dependency>
    <groupId>io.webfolder</groupId>
    <artifactId>cdp4j</artifactId>
    <version>3.0.7-SNAPSHOT</version>
</dependency>

Download

cdp4j-3.0.6.jar - 845 KB

cdp4j-3.0.6-sources.jar - 557 KB

Supported Platforms

cdp4j has been tested under Windows 10 and Ubuntu, but should work on any platform where a Java & Chrome/Chromium available.

Release Notes

CHANGELOG.md

Headless Mode

cdp4j can be run in "headless" mode using with Headless Chrome.

Install Chrome on Debian/Ubuntu

# https://askubuntu.com/questions/79280/how-to-install-chrome-browser-properly-via-command-line
sudo apt-get install libxss1 libappindicator1 libappindicator3-1 libindicator7
wget https://dl.google.com/linux/direct/google-chrome-stable_current_amd64.deb
sudo dpkg -i google-chrome*.deb # Might show "errors", fixed by next line
sudo apt-get install -f

Install Chrome on RHEL/CentOS/Fedora

wget https://dl.google.com/linux/direct/google-chrome-stable_current_x86_64.rpm
sudo yum install google-chrome-stable_current_*.rpm

Test headless Chrome

google-chrome --headless --remote-debugging-port=9222 --disable-gpu

JavaDoc

cdp4j api

Logging

Simple logger for Java (SLF4J) and log4j 1.x is supported.

Design Principles

  • Avoid external dependencies as much as possible.
  • Support only Chrome/Chromium based browsers.
  • Supports full capabilities of the Chrome DevTools Protocol.
  • Keep the API simple.

Usage Examples

Print text content with cdp4j

Launcher launcher = new Launcher();
try (SessionFactory factory = launcher.launch();
                    Session session = factory.create()) {
    session.navigate("https://webfolder.io");
    session.waitDocumentReady();
    String content = (String) session.getProperty("//body", "outerText");
    System.out.println(content);
}

Full page screen capture with cdp4j

Launcher launcher = new Launcher();
Path file = createTempFile("screenshot", ".png");
try (SessionFactory factory = launcher.launch();
                    Session session = factory.create()) {
    session.navigate("https://news.ycombinator.com");
    session.waitDocumentReady();
    // activate the tab/session before capturing the screenshot
    session.activate();
    byte[] data = session.captureScreenshot();
    write(file, data);
}
if (isDesktopSupported()) {
    getDesktop().open(file.toFile());
}

Print to PDF with cdp4j

Launcher launcher = new Launcher();
Path file = createTempFile("webfolder-linux-setup", ".pdf");
try (SessionFactory factory = launcher.launch(asList("--headless", "--disable-gpu"))) {
    String context = factory.createBrowserContext();
    try (Session session = factory.create(context)) {
        session.navigate("https://webfolder.io?cdp4j");
        session.waitDocumentReady();
        session.wait(1000);
        byte[] content = session
                            .getCommand()
                            .getPage()
                            .printToPDF();
        write(file, content);
        if (isDesktopSupported()) {
            getDesktop().open(file.toFile());
        }
    }
}

Samples

- - - -
Attributes.java Bing.java BingTranslator.java CheckBox.java
ExecuteJavascript.java GoogleTranslate.java HelloWorld.java IncognitoBrowsing.java
Logging.java MultiSelect.java NetworkResponse.java Screenshot.java
Select.java SendKeys.java SharedSession.java EvaluateOnNewDocument.java
UserAgent.java WaitUntil.java XPathSelector.java CodeCoverage.java
PrintToPDF.java BasicAuthentication.java DownloadFile.java Crawler.java
MultiProcess.java FollowRedirects.java CloseSessionOnRedirect.java Readability.java

Building cdp4j

# Assume that you have `google-chrome` in your $PATH
mvn install

# If you use different version of Google Chrome like Chromium, Chrome Canary,
# then you must explicitly use the `chrome_binary` property to make the code work.

mvn install -Dchrome_binary=/path/to/your/google-chrome

# e.g. For some Linux distribution
mvn install -Dchrome_binary=/usr/lib/chromium-dev/chromium-dev

# e.g. MacOS it may be something like
mvn install -Dchrome_binary=/Applications/Chromium.app/Contents/MacOS/Chromium

# To run the existing tests try
mvn test -Dchrome_binary=/usr/lic/chromium-dev/chromium-dev

How it is tested

cdp4j is regularly built and tested on Windows 10 and Ubuntu.

Getting Help

WebFolder

You can support cdp4j development by buying support package. Please contact us for support packages & pricing.