package us.codecraft.webmagic.processor.example;
   
   import us.codecraft.webmagic.Page;
   import us.codecraft.webmagic.Site;
   import us.codecraft.webmagic.Spider;
   import us.codecraft.webmagic.processor.PageProcessor;
   
   /**
    * @author code4crafter@gmail.com <br>
   * @since 0.6.0
   */
  public class ZhihuPageProcessor implements PageProcessor {
  
      private Site site = Site.me().setRetryTimes(3).setSleepTime(1000);
  
      @Override
      public void process(Page page) {
          page.addTargetRequests(page.getHtml().links().regex("https://www\\.zhihu\\.com/question/\\d+/answer/\\d+.*").all());
          page.putField("title", page.getHtml().xpath("//h1[@class='QuestionHeader-title']/text()").toString());
          page.putField("question", page.getHtml().xpath("//div[@class='QuestionRichText']//tidyText()").toString());
          page.putField("answer", page.getHtml().xpath("//div[@class='QuestionAnswer-content']/tidyText()").toString());
          if (page.getResultItems().get("title")==null){
              //skip this page
              page.setSkip(true);
          }
      }
  
      @Override
      public Site getSite() {
          return site;
      }
  
      public static void main(String[] args) {
          Spider.create(new ZhihuPageProcessor()).addUrl("https://www.zhihu.com/explore").run();
      }
  }