web-crawler

Im using scrapy to crawl a news website on a daily basis. How do i restrict scrapy from scraping already scraped URLs. Also is there any clear documentation or examples on SgmlLinkExtractor . Jama22 You can actually do this quite easily with the scrapy snippet located here: http://snipplr.com/view/67018/middleware-to-avoid-revisiting-already-visited-items/ To use it, copy the code from the link and put it into some file in your scrapy project. To reference it, add a line in your settings.py to reference it: SPIDER_MIDDLEWARES = { 'project.middlewares.ignore.IgnoreVisitedItems': 560 } The

Is there a way to run all of the spiders in a Scrapy project without using the Scrapy daemon? There used to be a way to run multiple spiders with scrapy crawl , but that syntax was removed and Scrapy's code changed quite a bit. I tried creating my own command: from scrapy.command import ScrapyCommand from scrapy.utils.misc import load_object from scrapy.conf import settings class Command(ScrapyCommand): requires_project = True def syntax(self): return '[options]' def short_desc(self): return 'Runs all of the spiders' def run(self, args, opts): spman_cls = load_object(settings['SPIDER_MANAGER

I've built a crawler that had to run on about 5M pages (by increasing the url ID) and then parses the pages which contain the info' I need. after using an algorithm which run on the urls (200K) and saved the good and bad results I found that the I'm wasting a lot of time. I could see that there are a a few returning subtrahends which I can use to check the next valid url. you can see the subtrahends quite fast (a little ex' of the few first "good IDs") - 510000011 # +8 510000029 # +18 510000037 # +8 510000045 # +8 510000052 # +7 510000060 # +8 510000078 # +18 510000086 # +8 510000094 # +8

I'm working on fetching data from wiki pages. I'm using a combination of php and jquery to do this. First I am using curl in php to fetch page contents and echoing the content. The filename is content.php : $url = $_GET['url']; $url = trim($url," "); $url = urldecode($url); $url = str_replace(" ","%20",$url); echo "<a class='urlmax'>".$_GET['title']."</a>"; echo crawl($url); Then jQuery is used to find the matched elements. $.get("content.php",{url:"http://en.wikipedia.org/w/index.php?action=render&title="+str_replace(" ","_",data[x]),title:str_replace(" ","_",data[x])},function(hdata){ var

I have created a simple web crawler but i want to add the recursion function so that every page that is opened i can get the urls in this page,but i have no idea how i can do that and i want also to include threads to make it faster here it is my code namespace Crawler { public partial class Form1 : Form { String Rstring; public Form1() { InitializeComponent(); } private void button1_Click(object sender, EventArgs e) { WebRequest myWebRequest; WebResponse myWebResponse; String URL = textBox1.Text; myWebRequest = WebRequest.Create(URL); myWebResponse = myWebRequest.GetResponse();//Returns a