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webmagic

by code4craft

code4craft /webmagic

A scalable web crawler framework for Java.

9.2K Stars 3.8K Forks Last release: about 3 years ago (WebMagic-0.7.3) Apache License 2.0 1.1K Commits 23 Releases

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A scalable crawler framework. It covers the whole lifecycle of crawler: downloading, url management, content extraction and persistent. It can simplify the development of a specific crawler.

Features:

  • Simple core with high flexibility.
  • Simple API for html extracting.
  • Annotation with POJO to customize a crawler, no configuration.
  • Multi-thread and Distribution support.
  • Easy to be integrated.

Install:

Add dependencies to your pom.xml:

<dependency>
    <groupid>us.codecraft</groupid>
    <artifactid>webmagic-core</artifactid>
    <version>0.7.3</version>
</dependency><dependency>
    <groupid>us.codecraft</groupid>
    <artifactid>webmagic-extension</artifactid>
    <version>0.7.3</version>
</dependency>

WebMagic use slf4j with slf4j-log4j12 implementation. If you customized your slf4j implementation, please exclude slf4j-log4j12.

<exclusions>
    <exclusion>
        <groupid>org.slf4j</groupid>
        <artifactid>slf4j-log4j12</artifactid>
    </exclusion>
</exclusions>

Get Started:

First crawler:

Write a class implements PageProcessor. For example, I wrote a crawler of github repository infomation.

public class GithubRepoPageProcessor implements PageProcessor { private Site site = Site.me().setRetryTimes(3).setSleepTime(1000); @Override public void process(Page page) { page.addTargetRequests(page.getHtml().links().regex("(https://github\\.com/\\w+/\\w+)").all()); page.putField("author", page.getUrl().regex("https://github\\.com/(\\w+)/.\*").toString()); page.putField("name", page.getHtml().xpath("//h1[@class='public']/strong/a/text()").toString()); if (page.getResultItems().get("name")==null){ //skip this page page.setSkip(true); } page.putField("readme", page.getHtml().xpath("//div[@id='readme']/tidyText()")); } @Override public Site getSite() { return site; } public static void main(String[] args) { Spider.create(new GithubRepoPageProcessor()).addUrl("https://github.com/code4craft").thread(5).run(); } }
  • page.addTargetRequests(links)

Add urls for crawling.

You can also use annotation way:

@TargetUrl("https://github.com/\\w+/\\w+") @HelpUrl("https://github.com/\\w+") public class GithubRepo { @ExtractBy(value = "//h1[@class='public']/strong/a/text()", notNull = true) private String name; @ExtractByUrl("https://github\\.com/(\\w+)/.\*") private String author; @ExtractBy("//div[@id='readme']/tidyText()") private String readme; public static void main(String[] args) { OOSpider.create(Site.me().setSleepTime(1000) , new ConsolePageModelPipeline(), GithubRepo.class) .addUrl("https://github.com/code4craft").thread(5).run(); } }

Docs and samples:

Documents: http://webmagic.io/docs/

The architecture of webmagic (refered to Scrapy)

image

There are more examples in

webmagic-samples

package.

Lisence:

Lisenced under Apache 2.0 lisence

Thanks:

To write webmagic, I refered to the projects below :

  • Scrapy*

A crawler framework in Python.

http://scrapy.org/

  • Spiderman*

Another crawler framework in Java.

http://git.oschina.net/l-weiwei/spiderman

Mail-list:

https://groups.google.com/forum/#!forum/webmagic-java

http://list.qq.com/cgi-bin/qf_invite?id=023a01f505246785f77c5a5a9aff4e57ab20fcdde871e988

QQ Group: 373225642 542327088

Related Project

A web console based on WebMagic for Spider configuration and management.

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