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@ -37,16 +37,29 @@ webmagic的github地址:[https://github.com/code4craft/webmagic](https://githu
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webmagic使用maven管理依赖,在项目中添加对应的依赖即可使用webmagic:
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<dependency>
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<groupId>us.codecraft</groupId>
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<artifactId>webmagic-core</artifactId>
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<version>0.4.3</version>
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</dependency>
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<dependency>
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<groupId>us.codecraft</groupId>
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<artifactId>webmagic-extension</artifactId>
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<version>0.4.3</version>
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</dependency>
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```xml
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<dependency>
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<groupId>us.codecraft</groupId>
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<artifactId>webmagic-core</artifactId>
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<version>0.4.3</version>
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</dependency>
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<dependency>
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<groupId>us.codecraft</groupId>
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<artifactId>webmagic-extension</artifactId>
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<version>0.4.3</version>
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</dependency>
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```
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WebMagic 使用slf4j-log4j12作为slf4j的实现.如果你自己定制了slf4j的实现,请在项目中去掉此依赖。
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```xml
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<exclusions>
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<exclusion>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-log4j12</artifactId>
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</exclusion>
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</exclusions>
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```
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#### 项目结构
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@ -83,30 +96,30 @@ webmagic还包含两个可用的扩展包,因为这两个包都依赖了比较
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PageProcessor是webmagic-core的一部分,定制一个PageProcessor即可实现自己的爬虫逻辑。以下是抓取osc博客的一段代码:
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```java
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public class OschinaBlogPageProcesser implements PageProcessor {
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public class OschinaBlogPageProcesser implements PageProcessor {
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private Site site = Site.me().setDomain("my.oschina.net");
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private Site site = Site.me().setDomain("my.oschina.net");
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@Override
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public void process(Page page) {
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List<String> links = page.getHtml().links().regex("http://my\\.oschina\\.net/flashsword/blog/\\d+").all();
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page.addTargetRequests(links);
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page.putField("title", page.getHtml().xpath("//div[@class='BlogEntity']/div[@class='BlogTitle']/h1").toString());
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page.putField("content", page.getHtml().$("div.content").toString());
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page.putField("tags",page.getHtml().xpath("//div[@class='BlogTags']/a/text()").all());
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}
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@Override
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public void process(Page page) {
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List<String> links = page.getHtml().links().regex("http://my\\.oschina\\.net/flashsword/blog/\\d+").all();
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page.addTargetRequests(links);
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page.putField("title", page.getHtml().xpath("//div[@class='BlogEntity']/div[@class='BlogTitle']/h1").toString());
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page.putField("content", page.getHtml().$("div.content").toString());
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page.putField("tags",page.getHtml().xpath("//div[@class='BlogTags']/a/text()").all());
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}
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@Override
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public Site getSite() {
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return site;
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@Override
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public Site getSite() {
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return site;
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}
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}
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public static void main(String[] args) {
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Spider.create(new OschinaBlogPageProcesser()).addUrl("http://my.oschina.net/flashsword/blog")
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.addPipeline(new ConsolePipeline()).run();
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}
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public static void main(String[] args) {
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Spider.create(new OschinaBlogPageProcesser()).addUrl("http://my.oschina.net/flashsword/blog")
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.addPipeline(new ConsolePipeline()).run();
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}
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}
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```
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@ -121,24 +134,24 @@ Spider是爬虫的入口类。Pipeline是结果输出和持久化的接口,这
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webmagic-extension包括了注解方式编写爬虫的方法,只需基于一个POJO增加注解即可完成一个爬虫。以下仍然是抓取oschina博客的一段代码,功能与OschinaBlogPageProcesser完全相同:
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```java
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@TargetUrl("http://my.oschina.net/flashsword/blog/\\d+")
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public class OschinaBlog {
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@TargetUrl("http://my.oschina.net/flashsword/blog/\\d+")
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public class OschinaBlog {
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@ExtractBy("//title")
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private String title;
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@ExtractBy("//title")
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private String title;
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@ExtractBy(value = "div.BlogContent",type = ExtractBy.Type.Css)
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private String content;
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@ExtractBy(value = "div.BlogContent",type = ExtractBy.Type.Css)
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private String content;
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@ExtractBy(value = "//div[@class='BlogTags']/a/text()", multi = true)
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private List<String> tags;
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@ExtractBy(value = "//div[@class='BlogTags']/a/text()", multi = true)
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private List<String> tags;
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public static void main(String[] args) {
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OOSpider.create(
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Site.me(),
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new ConsolePageModelPipeline(), OschinaBlog.class).addUrl("http://my.oschina.net/flashsword/blog").run();
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}
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}
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public static void main(String[] args) {
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OOSpider.create(
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Site.me(),
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new ConsolePageModelPipeline(), OschinaBlog.class).addUrl("http://my.oschina.net/flashsword/blog").run();
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}
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}
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```
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这个例子定义了一个Model类,Model类的字段'title'、'content'、'tags'均为要抽取的属性。这个类在Pipeline里是可以复用的。
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@ -175,6 +188,7 @@ webmagic遵循[Apache 2.0协议](http://opensource.org/licenses/Apache-2.0)
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* [ywooer](https://github.com/ywooer)
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* [yyw258520](https://github.com/yyw258520)
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* [perfecking](https://github.com/perfecking)
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* [ccliangbo](https://github.com/ccliangbo)
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* [lidongyang](http://my.oschina.net/lidongyang)
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### 邮件组:
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