Which programming language is WebMagic written in?

WebMagic is a web scraping framework that is written in Java. It is designed to simplify the process of web scraping by providing a simple API that can handle various aspects of the task, such as fetching web pages, extracting data, and storing it in the desired format.

WebMagic is open-source and utilizes other Java libraries like Jsoup for HTML parsing and HttpClient for making HTTP requests. It is designed to be highly customizable and extensible, allowing developers to implement complex web scraping tasks with less effort.

Here is a simple example of how to use WebMagic in Java to scrape data from a web page:

import us.codecraft.webmagic.Page;
import us.codecraft.webmagic.Site;
import us.codecraft.webmagic.Spider;
import us.codecraft.webmagic.processor.PageProcessor;

public class MyProcessor implements PageProcessor {

    // Configure the site settings like retry times, sleep time between requests etc.
    private Site site = Site.me().setRetryTimes(3).setSleepTime(1000);

    @Override
    public void process(Page page) {
        // Define how to extract information from the page
        page.putField("title", page.getHtml().xpath("//title/text()").toString());
        // Add URLs to fetch
        page.addTargetRequests(page.getHtml().links().regex("(https://mywebsite\\.com/\\w+)").all());
    }

    @Override
    public Site getSite() {
        return site;
    }

    public static void main(String[] args) {
        // Start the spider and initialize it with the custom PageProcessor
        Spider.create(new MyProcessor())
                .addUrl("http://mywebsite.com")
                .thread(5)
                .run();
    }
}

This code snippet defines a PageProcessor that tells the WebMagic Spider how to process the pages it fetches. It sets some basic site properties, defines how to extract the title from the fetched pages, and how to find new URLs to continue the scraping process.

Please note that you need to include the WebMagic library in your Java project to use it. If you are using Maven, you can add the following dependency to your pom.xml:

<dependency>
    <groupId>us.codecraft</groupId>
    <artifactId>webmagic-core</artifactId>
    <version>0.7.3</version>
</dependency>

Be sure to check for the latest version of WebMagic on their official website or Maven Central Repository to use in your project.