简书爬取专题文章（爱它就把它爬下来）

简书里的文章有分专题，如

然后随便进入一个专题：

然后问题来，这个专题里面总共有132篇文章，但是先看看它的源代码，里面的有一篇文章居然在源码里搜不到！这也就意味着这篇文章的链接就提取不到了！它的源码里只有到《别再信息偏食……》的内容

好吧，那么要怎么才能把一个专题给爬取完全呢？先开启浏览器网络模式，随着鼠标下滑，发现页面进行了新的载入。

分析新的url，发现专题是通过page来实现页面载入了，那就好办了。在上篇介绍的爬取代码里稍作修改即可:

import java.io.FileWriter;
import java.io.IOException;
import java.util.Vector;

import com.hpre.spider.common.Function;
import com.hpre.spider.tools.Tools;



public class Download_jianshuxiahua {
    public static void main(String[] args) throws IOException {
        String url = "http://www.jianshu.com/collection/ca3b663e5772"; //专题url
        byte[] information = Function.download(url);
//      System.out.println(new String(information));
        Vector<String> hrefs = new Vector<String>();
        Vector<String> title = new Vector<String>();

        FileWriter writer;
        Tools.getMultiResultsByOneXpathPattern(information, "utf-8",
                "//div[@id='list-container']//li[@class='have-img']/div/h4/a/text()", title);
        Tools.getMultiResultsByOneXpathPattern(information, "utf-8",
                "//div[@id='list-container']//li[@class='have-img']/div/h4/a/@href", hrefs);
        for (int j = 0 ;j<=4000;j++){
    
    
            String page_url = "http://www.jianshu.com/collections/263/notes?order_by=added_at&page="+(j+2);
            byte[] more_information = Function.download(page_url);
            if (more_information.length<=13192){
                break;
            }
            Tools.getMultiResultsByOneXpathPattern(more_information, "utf-8",
                    "//div[@id='list-container']//li[@class='have-img']/div/h4/a/text()", title);
            Tools.getMultiResultsByOneXpathPattern(more_information, "utf-8",
                    "//div[@id='list-container']//li[@class='have-img']/div/h4/a/@href", hrefs);

        }

        for (int i = 0;i<hrefs.size();i++){
    
    
            Vector<String> content = new Vector<String>();
            String new_href = "http://www.jianshu.com" + hrefs.get(i);
            byte[] detail_information = Function.download(new_href);
            Tools.getMultiResultsByOneXpathPattern(detail_information, "utf-8",
                    "//div[@class='show-content']//p/text()", content);
            System.out.println(content.toString());
            writer = new FileWriter("C://Users//Administrator//Desktop//gongju//"+title.get(i).trim().replace("|", "")
                    .replace("?", "")+".txt");
            for (int n = 0;n<content.size();n++){
    
    
                String lines = content.get(n).trim() + "\r\n";
                    writer.write(lines);
            }
            writer.flush();
            writer.close();
        }
    }
}

成果如下，是不是so easy：