web爬虫WebMagic-0.7.3源代码及示例

 [Readme in Chinese](https://github.com/code4craft/webmagic/tree/master/README-zh.md) [](https://travis-ci.org/code4craft/webmagic) >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: ```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. ```xml <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. ```java 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: ```java @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/](http://webmagic.io/docs/) The architecture of webmagic (refered to [Scrapy](http://scrapy.org/))  There are more examples in `webmagic-samples` package. ### Lisence: Lisenced under [Apache 2.0 lisence](http://opensource.org/licenses/Apache-2.0) ### Thanks: To write webmagic, I refered to the projects below : * **Scrapy** A crawler framework in Python. [http://scrapy.org/](http://scrapy.org/) * **Spiderman** Another crawler framework in Java. [http://git.oschina.net/l-weiwei/spiderman](http://git.oschina.net/l-weiwei/spiderman) ### Mail-list: [https://groups.google.com/forum/#!forum/webmagic-java](https://groups.google.com/forum/#!forum/webmagic-java) [http://list.qq.com/cgi-bin/qf_invite?id=023a01f505246785f77c5a5a9aff4e57ab20fcdde871e988](http://list.qq.com/cgi-bin/qf_invite?id=023a01f505246785f77c5a5a9aff4e57ab20fcdde871e988) QQ Group: 373225642 542327088 ### Related Project * <a href="https://github.com/gsh199449/spider" target="_blank">Gather Platform</a> A web console based on WebMagic for Spider configuration and management.