Question

我想从youtube评论中抓取用户名，例如页面：

http://www.youtube.com/all_comments?v=mIA0W69U2_Y

我希望获得所有用户名/显示名称：“fedfields”，“mystik dread” 和相应的链接（当你点击“fedfields”，它将链接到其个人资料）我想使用自动bash脚本来剪贴它们我有以下问题：

1我原来的方法是编写自动脚本，使用wget下载页面，然后使用正则表达式来处理页面以获取这些名称，但是这样，我需要下载整个页面，每页都是几MB，如果我下载了很多页面，它会花费很多空间，有更好的方法吗？

2有很多页面，比如在链接中，有7页，是否可以将它们全部放在一个页面中？

Answer 1

您可以在C＃应用程序中使用HtmlAgilityPack。

        HtmlAgilityPack.HtmlWeb web = new HtmlWeb();
        HtmlAgilityPack.HtmlDocument doc = web.Load(Url);
        IEnumerable<HtmlNode> userNames = doc.DocumentNode.Descendants("a").Where(
            d => d.Attributes.Contains("class") &&   
            d.Attributes["class"].Value.Contains("yt-user-name"));

Useful info about parsing html with RegEx

我不知道youtube内容是否具有本机gzip压缩，但您可以使用WebRequest类进行检查。如果是，它将显着减少流量。

webRequest = (HttpWebRequest)WebRequest.Create(url);
webRequest.Method = WebRequestMethods.Http.Get;
webRequest.KeepAlive = true;
webRequest.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
webRequest.Headers.Add("Accept-Encoding", "gzip,deflate");
HttpWebResponse webResponse = (HttpWebResponse)webRequest.GetResponse(); 
MessageBox.Show(webResponse.ContentEncoding.ToString());

然后您可以使用HTMLAgilityPack读取流并获取用户名。

Answer 2

在mashape上使用ScrapeGoat将所有用户名作为json对象返回：）

https://www.mashape.com/warting/scrapegoat/

curl --include --request GET 'https://scrapegoat.p.mashape.com/?url=http%3A%2F%2Fwww.youtube.com%2Fall_comments%3Fv%3DmIA0W69U2_Y&selector=.yt-user-name' --header "X-Mashape-Authorization: <MASHAPE API KEY>"

结果：

{"message":"ok","payload":["whitehouse","Osambasucks2","Osambasucks2","Osambasucks2","omar barazanji","omar barazanji","omar barazanji","omar barazanji","omar barazanji","omar barazanji","HigherPlanes","HigherPlanes","HigherPlanes","RamonaFromPomona","RamonaFromPomona","Osambasucks2","Osambasucks2","Osambasucks2","RamonaFromPomona","terminator360tm","terminator360tm","terminator360tm","terminator360tm","terminator360tm","terminator360tm","Osambasucks2","Osambasucks2","Osambasucks2","Joe Lackey","Joe Lackey","Joe Lackey","ThaGenius101","ThaGenius101","ThaGenius101","Joe Lackey","Ed Patowski","Ed Patowski","Ed Patowski","toughdogyt","toughdogyt","toughdogyt","Osambasucks2","Osambasucks2","Osambasucks2","goodkarmaband","goodkarmaband","Martynas Valiukas","Martynas Valiukas","Martynas Valiukas","goodkarmaband","goodkarmaband","goodkarmaband","Martynas Valiukas","XRedstone688X","XRedstone688X","XRedstone688X","goodkarmaband","Trevor Jones","Trevor Jones","Trevor Jones","goodkarmaband","V 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Answer 3

执行此操作：

import re
import sys
import time
import urllib2

html = True

argv_list = sys.argv
if len(argv_list) == 2:
    vid = argv_list[1]
else:
    vid = "mIA0W69U2_Y"

regex = re.compile("<span class=\"author.*?<a href=\"(.*?)\".*? dir=\"ltr\">(.*?)</a>", re.DOTALL | re.UNICODE | re.IGNORECASE)

index = 1
author_lists = []
t1 = time.time()
print "######################### Start #########################"

while 1:
    url = "http://www.youtube.com/watch_ajax?action_get_comments=1&v="+vid+"&commenttype=everything&source=w&page_size=500&p="+str(index)+"&format=XML"
    print "Retrieving page "+str(index)+": ", url
    o = urllib2.urlopen(url)
    r = o.read()
    elements = regex.findall(r)
    author_list = []
    for x, y in elements:

        if x.startswith("http://") or x.startswith("https://"):
            continue
        xx = "".join(["http://www.youtube.com", x])
        href = xx.strip()
        #print href


        if "</span>" not in y :
            uname = y.strip()
        else:
            uname = y.split("</span>")[0].strip()

        if uname.startswith("<a"):
            continue

        if not uname or not href:
            continue

        if html:
            #1 output html
            author = "".join(["<a href=\"", href, "\">", uname, "</a>"])
        else:
            #2 output txt
            author = " ".join([uname, href])

        author_list.append(author)

    t = "%02d:%02d:%02d" % reduce(lambda ll,b : divmod(ll[0],b) + ll[1:], [(time.time()-t1,),60,60])
    print "".join(["Time passed: ", t])
    if not author_list:
        break
    else:
        author_lists.extend(author_list)
    index+=1
    #break #uncomment it if you only want to test one page

print "######################### Finished #########################"
print "Total comments: ", len(author_lists)
if author_lists:
    author_lists.sort()
    last = author_lists[-1]
    for i in range(len(author_lists)-2, -1, -1):
        if last == author_lists[i]:
            del author_lists[i]
        else:
            last = author_lists[i]
    if html:
        authors = "<br>".join(author_lists)
        authors = "".join(["<html><meta http-equiv='Content-Type' content='text/html; charset=utf-8'><body>", authors, "</body></html>"])
        fname = vid+".html"
    else:
        authors = "\n".join(author_lists)
        fname = vid+".txt"

    #print "Authors: ", authors
    print "Total commenters: ", len(author_lists)



    oo = open(fname, "w")
    oo.write(authors)
    oo.close()
print "######################### Exist #########################"

示例txt输出：

enter image description here

示例html输出：

enter image description here

Answer 4

C＃也可以帮助这种方式（尽管HAP和WebRequest更好）：

     SHDocVw.InternetExplorer ie = new
            SHDocVw.InternetExplorerClass();
            WebBrowser wb = (WebBrowser)ie;
            wb.Visible = true;
            //Do anything else with the window here that you wish
            wb.Navigate("https://adwords.google.co.uk/um/Logout", ref o, ref o, ref o, ref o);
            while (wb.Busy) { Thread.Sleep(100); }
            HTMLDocument document = ((HTMLDocument)wb.Document);
            IHTMLElement element = document.getElementById("Email");
            HTMLInputElementClass email = (HTMLInputElementClass)element;
            email.value = "testtestingtton@gmail.com";
            email = null;
            element = document.getElementById("Passwd");
            HTMLInputElementClass pass = (HTMLInputElementClass)element;
            pass.value = "pass";
            pass = null;
            element = document.getElementById("signIn");
            HTMLInputElementClass subm = (HTMLInputElementClass)element;
            subm.click();
            subm = null;

Answer 5

为名称字段和要提取的其他字段编写rssfeeds使用自动插件设置抓取工具按照以下步骤How to extract the data from multiple website

Answer 6

以下是使用 ruby and gems nokogiri和open-uri的简单解决方案

require 'nokogiri'
require 'open-uri'
url="https://www.youtube.com/all_comments?v=mIA0W69U2_Y"
dom=Nokogiri::HTML(open(url))
dom.xpath("//div[@class='comment-entry']").each do |comment|
  username=comment.xpath(".//a[contains(@class,'user-name')]").first
  username=username.content.chomp.strip if username
  profilelink=comment.xpath(".//a[contains(@class,'user-name')]/@href").first
  profilelink=profilelink.content.chomp.strip if profilelink
  profilelink="http://www.youtube.com"+profilelink if profilelink.match(/^\//)
  puts "#{username} #{profilelink}" if username and profilelink
end

有关详细信息，请访问How to extract data easily from multiple websites

在网页上抓取用户名的好方法

6 个答案: