google-crawlers | 易学教程

How to add ( integrate ) crawljax with crawler4j?

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问题 I am working on web crawler which fetch data form website using crawler4j and everything goes well but the main problem is with ajax-based events . So, I found crawljax library does this matter but I couldn't where and when to use it . When have I use it ( I mean work sequences )? before fetching page using crawler4j. Or after fetching page using crawler4j. Or have I use url coming using crawler4j and use it to fetch Ajax data (page) using crawljax. 回答1: The library crawljax is basically a

How to scrape all possible results from a search bar of a website

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问题 This is my first web scraping task. I have been tasked with scraping this website It is a site that contains the names of lawyers in Denmark. My difficulty is that I can only retrieve names based on the particular name query i put in the search bar. Is there an online web tool I can use to scrape all the names that the website contains? I have used tools like Import.io with no success so far. I am super confused on how all of this works. 回答1: Please scroll down to UPDATE 2 The website

How do search engines crawl Javascript?

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问题 If I add random keywords alt attrb to the images using jQuery document.ready (thinking that the page is already loaded), how does it affect search engines? Will the search engines get the alt attrb that I added with any JavaScript at all? If not how come it can understand Ajax calls sent via JavaScript? I want to add the alt attrb to images that don't have any in my client's site, in case they forget to put an alt text. jQuery will replace the empty ones with keywords. Is this possible? 回答1:

Making AngularJS and Parse Web App Crawlable with Prerender

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问题 I have been trying to get my AngularJS and Parse web app crawlable for Google and Facebook share and even with prerender-parse I have not been able to get it working. I have tried using tips from this Parse Developers thread for engaging HTML5 Mode. Nothing will work using the Facebook URL debugger or Google Fetch Bot. Can anyone share a full step by step setup that they have used and is currently working? 回答1: After some help from Prerender.io team, here are the outlined steps that resulted

Does html5mode(true) affect google search crawlers

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问题 I'm reading this specification which is an agreement between web servers and search engine crawlers that allows for dynamically created content to be visible to crawlers. It's stated there that in order for a crawler to index html5 application one must implement routing using #! in URLs. In angular html5mode(true) we get rid of this hashed part of the URL. I'm wondering whether this is going to prevent crawlers from indexing my website. 回答1: Short answer - No, html5mode will not mess up your

org.jsoup.HttpStatusException: HTTP error fetching URL. Status=503 (google scholar ban?)

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I am working on crawler and I have to extract data from 200-300 links on Google Scholar. I have working parser which is getting data from pages (on every pages are 1-10 people profiles as result of my query. I'm extracting proper links, go to another page and do it again). During run of my program I spotted above error: org.jsoup.HttpStatusException: HTTP error fetching URL. Status=503, URL=https://ipv4.google.com/sorry/IndexRedirect?continue=https://scholar.google.pl/citations%3Fmauthors%3DAGH%2BUniversity%2Bof%2BScience%2Band%2BTechnology%26hl%3Dpl%26view_op%3Dsearch_authors&q

Small preview when sharing link on Social media Ruby On Rails

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I'm working on a site whose front end is in angularjs and backend in ROR , Same ROR API is used in an android app also . Now I have a situation here . I need to share my Web's post on the Social media like facebook , twitter and google plus . And along with the link to the single post there should be a small preview also (a preview of the post which crawls before posting e.g in facebook) .I did it using angular Plugins . But when it comes to Android side , what they share and what displays on Facebook is the Link only . Then i did some R&D and i came to know that it must be done on server side

Adding a hash prefix at the config phase if it's missing

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I am now integrating phantom in my Angularjs-based web application. This fine article says that I should call the $locationProvider.hashPrefix() method to set the prefix to '!' from SEO reasons(allow crawlers to intercept the _escaped_fragment component of the URL). The problem is that I haven't though of the earlier, and some of my URLs look as following: #/home . I though perhaps there is a way that I can implant this '!' char into the begging of the URL programmatically(in case it is not already there) at the config function of the APP, instead having to edit a lot of markup manually. I've

Prevent Custom Web Crawler from being blocked

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问题 I am creating a new web crawler using C# to crawl some specific websites. every thing goes fine. but the problem is that some websites are blocking my crawler IP address after some requests. I tried using timestamps between my crawl requests. but did not worked. is there any way to prevent websites from blocking my crawler ? some solutions like this would help (but I need to know how to apply them): simulating Google bot or yahoo slurp using multiple IP addresses (event fake IP addresses) as

Any possibility to crawl open web browser data using aperture

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I known about crawl website using Aperture. if i open http://demo.crawljax.com/ in mozila web browser. how can crawl open browser content using Aperture. Steps: 1. Open http://demo.crawljax.com/ on your mozila firefox. 2. Executed java program to crawl open mozila firefox tab. Kumar It seems you need to crawl the JavaScript/Ajax page. You actually need a crawler like googlebot. See this googlebot can crawl the javascript page. You can do it using some other drivers/crawlers. Here similar question found. You can try out the best answer from here BasK Its imposable to crawl the open Webbrowser