Java 크롤러 프레임워크 비교: 최선의 선택은 무엇입니까?

import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;

public class JsoupExample {
   public static void main(String[] args) throws Exception {
      // 发送HTTP请求获取HTML文档
      String url = "http://example.com";
      Document doc = Jsoup.connect(url).get();
      
      // 解析并遍历HTML文档
      Elements links = doc.select("a[href]");
      for (Element link : links) {
         System.out.println(link.attr("href"));
      }
   }
}

import org.apache.nutch.crawl.CrawlDatum;
import org.apache.nutch.crawl.Inlinks;
import org.apache.nutch.fetcher.Fetcher;
import org.apache.nutch.parse.ParseResult;
import org.apache.nutch.protocol.Content;
import org.apache.nutch.util.NutchConfiguration;

public class NutchExample {
   public static void main(String[] args) throws Exception {
      String url = "http://example.com";
      
      // 创建Fetcher对象
      Fetcher fetcher = new Fetcher(NutchConfiguration.create());
      
      // 抓取网页内容
      Content content = fetcher.fetch(new CrawlDatum(url));
      
      // 处理网页内容
      ParseResult parseResult = fetcher.parse(content);
      Inlinks inlinks = parseResult.getInlinks();
      
      // 输出入链的数量
      System.out.println("Inlinks count: " + inlinks.getInlinks().size());
   }
}

import us.codecraft.webmagic.Spider;
import us.codecraft.webmagic.pipeline.ConsolePipeline;
import us.codecraft.webmagic.processor.PageProcessor;

public class WebMagicExample implements PageProcessor {
   public void process(Page page) {
      // 解析HTML页面
      String title = page.getHtml().$("title").get();
      
      // 获取链接并添加新的抓取任务
      page.addTargetRequests(page.getHtml().links().regex("http://example.com/.*").all());
      
      // 输出结果
      page.putField("title", title);
   }
   
   public Site getSite() {
      return Site.me().setRetryTimes(3).setSleepTime(1000);
   }
   
   public static void main(String[] args) {
      Spider.create(new WebMagicExample())
         .addUrl("http://example.com")
         .addPipeline(new ConsolePipeline())
         .run();
   }
}