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.
- 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.
Add dependencies to your pom.xml:
<dependency>
<groupId>us.codecraft</groupId>
<artifactId>webmagic-core</artifactId>
<version>0.4.2</version>
</dependency>
<dependency>
<groupId>us.codecraft</groupId>
<artifactId>webmagic-extension</artifactId>
<version>0.4.2</version>
</dependency>
Write a class implements PageProcessor：
public class OschinaBlogPageProcesser implements PageProcessor {
private Site site = Site.me().setDomain("my.oschina.net");
@Override
public void process(Page page) {
List<String> links = page.getHtml().links().regex("http://my\\.oschina\\.net/flashsword/blog/\\d+").all();
page.addTargetRequests(links);
page.putField("title", page.getHtml().xpath("//div[@class='BlogEntity']/div[@class='BlogTitle']/h1").toString());
page.putField("content", page.getHtml().$("div.content").toString());
page.putField("tags",page.getHtml().xpath("//div[@class='BlogTags']/a/text()").all());
}
@Override
public Site getSite() {
return site;
}
public static void main(String[] args) {
Spider.create(new OschinaBlogPageProcesser()).addUrl("http://my.oschina.net/flashsword/blog")
.addPipeline(new ConsolePipeline()).run();
}
}-
page.addTargetRequests(links)Add urls for crawling.
You can also use annotation way:
@TargetUrl("http://my.oschina.net/flashsword/blog/\\d+")
public class OschinaBlog {
@ExtractBy("//title")
private String title;
@ExtractBy(value = "div.BlogContent",type = ExtractBy.Type.Css)
private String content;
@ExtractBy(value = "//div[@class='BlogTags']/a/text()", multi = true)
private List<String> tags;
public static void main(String[] args) {
OOSpider.create(
Site.me(),
new ConsolePageModelPipeline(), OschinaBlog.class).addUrl("http://my.oschina.net/flashsword/blog").run();
}
}The architecture of webmagic (refered to Scrapy)
Javadocs: http://code4craft.github.io/webmagic/docs/en/
There are some samples in webmagic-samples package.
Lisenced under Apache 2.0 lisence
Thanks these people for commiting source code, reporting bugs or suggesting for new feature:
- yuany
- yxssfxwzy
- linkerlin
- d0ngw
- xuchaoo
- supermicah
- SimpleExpress
- aruanruan
- l1z2g9
- zhegexiaohuozi
- ywooer
- yyw258520
- perfecking
- lidongyang
To write webmagic, I refered to the projects below :
-
Scrapy
A crawler framework in Python.
-
Spiderman
Another crawler framework in Java.
https://groups.google.com/forum/#!forum/webmagic-java
