网络爬虫2:使用crawler4j爬取网络内容
https://github.com/yasserg/crawler4j
需要两个包:
crawler4j-4.1-jar-with-dependencies.jar
slf4j-simple-1.7.22.jar(如果不加,会有警告:SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".)
相关包下载:
http://download.csdn.net/detail/talkwah/9747407
(crawler4j-4.1-jar-with-dependencies.jar相关资料少,github下载半天还失败,故整理了一下)
参考资料:
http://blog.csdn.net/zjm131421/article/details/13093869
http://favccxx.blog.51cto.com/2890523/1691079/
import java.util.Set; import java.util.regex.Pattern; import edu.uci.ics.crawler4j.crawler.CrawlConfig; import edu.uci.ics.crawler4j.crawler.CrawlController; import edu.uci.ics.crawler4j.crawler.Page; import edu.uci.ics.crawler4j.crawler.WebCrawler; import edu.uci.ics.crawler4j.fetcher.PageFetcher; import edu.uci.ics.crawler4j.parser.HtmlParseData; import edu.uci.ics.crawler4j.robotstxt.RobotstxtConfig; import edu.uci.ics.crawler4j.robotstxt.RobotstxtServer; import edu.uci.ics.crawler4j.url.WebURL; public class AhCrawler extends WebCrawler { // 三要素: // _访问谁? // _怎么访? // _访上了怎么处置? private static final String C_URL = "http://www.ximalaya.com"; @Override public boolean shouldVisit(Page referringPage, WebURL url) { String href = url.getURL().toLowerCase(); // 不匹配:MP3|jpg|png结尾的资源 Pattern p = Pattern.compile(".*(\\.(MP3|jpg|png))$"); return !p.matcher(href).matches() && href.startsWith(C_URL); } @Override public void visit(Page page) { String url = page.getWebURL().getURL(); String parentUrl = page.getWebURL().getParentUrl(); String anchor = page.getWebURL().getAnchor(); System.out.println("↓↓↓↓↓↓↓↓↓"); System.out.println("URL :" + url); System.out.println("Parent page:" + parentUrl); System.out.println("Anchor text:" + anchor); logger.info("URL: {}", url); logger.debug("Parent page: {}", parentUrl); logger.debug("Anchor text: {}", anchor); if (page.getParseData() instanceof HtmlParseData) { HtmlParseData htmlParseData = (HtmlParseData) page.getParseData(); String text = htmlParseData.getText(); String html = htmlParseData.getHtml(); Set<WebURL> links = htmlParseData.getOutgoingUrls(); System.out.println("--------------------------"); // System.out.println("Text length: " + text.length()); // System.out.println("Html length: " + html.length()); System.out.println("Number of outgoing links: " + links.size()); } System.out.println("↑↑↑↑↑↑↑"); } public static void main(String[] args) throws Exception { // 源代码例子中,这两位是两只参数 // 配置个路径,这个路径相当于Temp文件夹,不用先建好, String crawlStorageFolder = "/data/crawl/root"; int numberOfCrawlers = 7; CrawlConfig crawlConf = new CrawlConfig(); crawlConf.setCrawlStorageFolder(crawlStorageFolder); PageFetcher pageFetcher = new PageFetcher(crawlConf); RobotstxtConfig robotConf = new RobotstxtConfig(); RobotstxtServer robotServ = new RobotstxtServer(robotConf, pageFetcher); // 控制器 CrawlController c = new CrawlController(crawlConf, pageFetcher, robotServ); // 添加网址 c.addSeed(C_URL); // 启动爬虫 c.start(AhCrawler.class, numberOfCrawlers); } }
CrawlController c 的来历:
结果示例:
↓↓↓↓↓↓↓↓↓
URL :http://www.ximalaya.com/5333001/sound/25320285
Parent page:http://www.ximalaya.com/dq/music-ACG/
Anchor text:俊豪演奏 - 琵琶版《刀劍如夢》
[Crawler 3] INFO edu.uci.ics.crawler4j.crawler.WebCrawler - URL: http://www.ximalaya.com/5333001/sound/25320285
--------------------------
Number of outgoing links: 131
↑↑↑↑↑↑↑
[Crawler 7] INFO edu.uci.ics.crawler4j.crawler.WebCrawler - URL: http://www.ximalaya.com/30119950/sound/12181402
↓↓↓↓↓↓↓↓↓
URL :http://www.ximalaya.com/30119950/sound/12181402
Parent page:http://www.ximalaya.com/dq/book-果麦文化/
Anchor text:第二十六集 人生的意思不在于留下什么,而在于经历
--------------------------
Number of outgoing links: 134
↑↑↑↑↑↑↑
↓↓↓↓↓↓↓↓↓
URL :http://www.ximalaya.com/zhubo/56833971/
Parent page:http://www.ximalaya.com/4932085/sound/21902925
Anchor text:null
[Crawler 1] INFO edu.uci.ics.crawler4j.crawler.WebCrawler - URL: http://www.ximalaya.com/zhubo/56833971/
--------------------------
Number of outgoing links: 68
↑↑↑↑↑↑↑
[Crawler 4] INFO edu.uci.ics.crawler4j.crawler.WebCrawler - URL: http://www.ximalaya.com/5413571/sound/2349697
↓↓↓↓↓↓↓↓↓
URL :http://www.ximalaya.com/5413571/sound/2349697
Parent page:http://www.ximalaya.com/dq/renwen-新知/
Anchor text:41-方明-西江月·夜行黄沙道中 南宋 辛弃疾
--------------------------
Number of outgoing links: 134
↑↑↑↑↑↑↑
[Crawler 6] INFO edu.uci.ics.crawler4j.crawler.WebCrawler - URL: http://www.ximalaya.com/5011186/sound/30650945
↓↓↓↓↓↓↓↓↓
URL :http://www.ximalaya.com/5011186/sound/30650945
Parent page:http://www.ximalaya.com/dq/finance-大咖/
Anchor text:03
--------------------------
Number of outgoing links: 111
↑↑↑↑↑↑↑
↓↓↓↓↓↓↓↓↓
URL :http://www.ximalaya.com/1000144/album/3559805
Parent page:http://www.ximalaya.com/dq/music-文艺/
Anchor text:null
[Crawler 2] INFO edu.uci.ics.crawler4j.crawler.WebCrawler - URL: http://www.ximalaya.com/1000144/album/3559805
--------------------------
Number of outgoing links: 85
↑↑↑↑↑↑↑
↓↓↓↓↓↓↓↓↓
URL :http://www.ximalaya.com/4932085/sound/21902925/liker
Parent page:http://www.ximalaya.com/4932085/sound/21902925
Anchor text:更多
[Crawler 1] INFO edu.uci.ics.crawler4j.crawler.WebCrawler - URL: http://www.ximalaya.com/4932085/sound/21902925/liker
--------------------------
Number of outgoing links: 96
↑↑↑↑↑↑↑
↓↓↓↓↓↓↓↓↓
URL :http://www.ximalaya.com/30895669/sound/19945445
Parent page:http://www.ximalaya.com/dq/music-ACG/
Anchor text:宫崎骏-久石让
[Crawler 3] INFO edu.uci.ics.crawler4j.crawler.WebCrawler - URL: http://www.ximalaya.com/30895669/sound/19945445
--------------------------
Number of outgoing links: 131
↑↑↑↑↑↑↑
↓↓↓↓↓↓↓↓↓
URL :http://www.ximalaya.com/9112346/album/2903291
Parent page:http://www.ximalaya.com/dq/book-果麦文化/
Anchor text:null
[Crawler 7] INFO edu.uci.ics.crawler4j.crawler.WebCrawler - URL: http://www.ximalaya.com/9112346/album/2903291
--------------------------
Number of outgoing links: 90
↑↑↑↑↑↑↑