content: import com.github.abola.crawler.CrawlerPack;
  import org.jsoup.nodes.Element;
  import org.jsoup.select.Elements;
  
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * 範例: 使用爬蟲包取得八卦版最後50篇文章的網址
   */
  class PttGossiping {
  
      final static String gossipMainPage = "https://www.ptt.cc/bbs/Gossiping/index.html";
      final static String gossipIndexPage = "https://www.ptt.cc/bbs/Gossiping/index%s.html";
      // 取得最後幾篇的文章數量
      static Integer loadLastPosts = 50;
  
      public static void main(String[] argv){
  
          String prevPage =
              CrawlerPack.start()
                  .addCookie("over18","1")                // 八卦版進入需要設定cookie
                  .getFromHtml(gossipMainPage)            // 遠端資料格式為 HTML
                  .select(".action-bar .pull-right > a")  // 取得右上角『前一頁』的內容
                  .get(1).attr("href")
                  .replaceAll("/bbs/Gossiping/index([0-9]+).html", "$1");
          // 目前最末頁 index 編號
          Integer lastPage = Integer.valueOf(prevPage)+1;
  
          List<String> lastPostsLink = new ArrayList<String>();
  
          while ( loadLastPosts > lastPostsLink.size() ){
              String currPage = String.format(gossipIndexPage, lastPage--);
  
              Elements links =
                  CrawlerPack.start()
                      .addCookie("over18", "1")
                      .getFromHtml(currPage)
                      .select(".title > a");
  
              for( Element link: links) lastPostsLink.add( link.attr("href") );
          }
  
          // 檢視結果
          for(String url : lastPostsLink){
              System.out.println(url);
          }
      }
  }
  