Metadata of News Webpages

Web Crawler Data Collection Module Web Crawler A web crawler (also known as a web spider or web robot) is a program or automated script which browses the World Wide Web in a methodical, automated manner. Search engines such as Google, Bing etc. uses web crawlers to index the newly created data on Internet. 16BIT IITR Web Crawler Data Collection Module News Crawler News Crawlers are focused on retrieving newly published News Data. News Crawlers monitors a set of defined News sources and captures the news as soon as it publishes.

Predefined Set of News Sources New URLs Architecture of News Crawler at IITR 16BIT News Article Downloader News URL Downloader Crawl every 30 Min

New URLs News Articles News Database IITR Web Crawler Data Collection Module Web Crawler A Simple Java Program for Downloading a Web Page

16BIT IITR Web Crawler Data Collection Module Parsing a Web Page Given a Web Page, we can retrieve different components by Parsing it. Many HTML Parsers are available such as Jsoup, Xerces, NekoHTML Following Java program uses Jsoup parser to extract Hyperlinks from a web page.

import org.jsoup.Jsoup; import org.jsoup.nodes.Document; import org.jsoup.nodes.Element; import org.jsoup.select.Elements; import java.io.IOException; import java.io.File; public class ExtractLinks { public static void main(String[] args) throws IOException { File input = new File("data.html"); Document doc = Jsoup.parse(input, "UTF-8", "); Elements links = doc.select("a[href]"); System.out.println("Total Number of Links:"+links.size()); for (Element link : links) { System.out.println(link.attr("abs:href")); } } } 16BIT

IITR Web Crawler Data Collection Module Retrieving Article Text There are many API available for extracting the main content from web pages, such as Boilerplate API Following Java program demonstrates the use of Boilerplate API to extract the article text from a news article import java.io.PrintWriter; import java.net.URL; import de.l3s.boilerpipe.BoilerpipeExtractor; import de.l3s.boilerpipe.extractors.CommonExtractors; import de.l3s.boilerpipe.sax.HTMLHighlighter; public class BoilerplateDemo { public static void main(String[] args) throws Exception { URL url = new URL("http://www.thehindu.com/news/national/land-acquisition-ordinance-bill-gets-a-burial/article7597517.ece"); final BoilerpipeExtractor extractor = CommonExtractors.ARTICLE_EXTRACTOR; // choose the operation mode (i.e., highlighting or extraction) //final HTMLHighlighter hh = HTMLHighlighter.newHighlightingInstance();

final HTMLHighlighter hh = HTMLHighlighter.newExtractingInstance(); PrintWriter out = new PrintWriter("highlighted.html", "UTF-8"); out.println(hh.process(url, extractor)); out.close(); System.out.println("Now open file highlighted.html in your web browser"); } } 16BIT IITR Article Extractor Data Collection Module Article Extraction Objective: To extract Article Content from Given News URL News URL: http://www.hindustantimes.com/world-t20/amitabh-bachchan-to-sing-national-anthem-before-india-pakistan-mat

ch/story-QXxnQAvmJsisvIYtSFv33L.html Bollywood superstar Amitabh Bachchan will sing the National Anthem before the start of the marquee India-Pakistan World Twenty20 cricket match at the Eden Gardens on March 19. Bachchan has confirmed the development by retweeting a post in his official Twitter handle while sources in the Cricket Association of Bengal today said this was an effort by its president Sourav Ganguly. The president was involved and the plan was on for a long time, CAB sources said. While the Big B will sing the National Anthem in his signature baritone, Pakistan will also make their presence felt with classical singer Shafaqat Amanat Ali who is slated to sing the Pakistani National Anthem. 16BIT IITR Article Extractor

Data Collection Module Add-ons: Noise http://timesofindia.indiatimes.com/india/India-became-3rd-largest-economy-in-2011-from-10th-in-2005/articleshow/34416429.cms 16BIT IITR Article Extractor Data Collection Module Article Extraction 16BIT IITR

Article Extractor Data Collection Module Article Extraction String url = input_url.html; String name = CLASS or ID name; Document doc = Jsoup.connect(url).timeout(100*1000).userAgent("Mozilla").get(); article = doc.getElementsByClass(name).text(); Or article = doc.getElementById(name).text(); String url = http://www.dnaindia.com/world/report-pakistan-blast-in-peshawar-bus-killsat-least-15-govt-employees-over-25-injured-2189902; String name = body-text; Document doc = Jsoup.connect(url).timeout(100*1000).userAgent("Mozilla").get(); article = doc.getElementsByClass(name).text(); Example 16BIT

IITR Extract Meta-Key Phrase Data Collection Module Metadata of News Webpages Metadata refers to data about data. It is always in the form of key-value pairs. Key : name = author Value : content = TCA Sharad Raghavan 16BIT IITR Extract Meta-Key Phrase Data Collection Module

Metadata of News Webpages Metadata content of a typical news webpage: Title, Description, News keywords, Author name, Last modified date, Publishing date, etc. News websites use various types of protocols to insert metadata. OGP (Open Graph Protocol) is one of them. Some of the well know OGP tags are : og:title - The title of your object as it should appear within the graph, e.g., "The Rock". og:type - The type of your object, e.g., "video.movie". Depending on the type you specify, other properties may also be required. og:image - An image URL which should represent your object within the graph. og:url - The canonical URL of your object that will be used as its permanent ID in the graph, e.g., "http://www.imdb.com/title/tt0117500/". 16BIT IITR

Extract Meta-Key Phrase Data Collection Module Open Graph Protocol Open Graph Protocol (OGP) provided by Facebook, allows the embedding of web content as Facebook social graph objects. It defines tags which can be used by web content generators for converting web objects into corresponding graph object. Facebook Graph Object 16BIT

IITR Extract Meta-Key Phrase Data Collection Module news_keyword Tag Keywords which are most relevant to the article. 16BIT IITR Twitter Crawler

Data Collection Module Twitter Online social networking and microblogging service. Enables its registered user to read and send messages of 140 characters known as tweets. Twitter contains data in following forms: Tweet: Message to send with 140 characters or less. Follower: A person who has chosen to read your tweets on an ongoing basis. Reply or @ : The @ symbol means you are talking to or about the person. Retweet or RT: The act of repeating what some one else has tweeted so that your followers can see it. HashTag or # : HashTag provide a theme for the tweet that allow all similar tweets to be searched. 16BIT IITR Twitter Crawler Data Collection Module

Twitter To Follow Tweet Persons Retweeted Reply HashTag Retweets 16BIT IITR Twitter Crawler Data Collection Module Data Extraction from Twitter Data from twitter can be extracted using either Twitter APIs or R packages. 1. Twitter APIs:

REST API Streaming API 2. R packages: twitteR RTwitterAPI 16BIT IITR Twitter Crawler Data Collection Module Data Extraction from Twitter using a REST API: Twitter4J 1. Login Twitter account. 2. Open link https://apps.twitter.com/app/new and create an application. 3. Generate Access token. 4. Create a New Java Project and include the Twitter4j Library from https:// dl.dropboxusercontent.com/u/1737239/twitter4j-core-2.2.5.jar

16BIT IITR Twitter Crawler Data Collection Module Java Code to Extract Tweets related to Query World Cup 16BIT IITR Twitter Crawler Data Collection Module Java Code to Extract Trends from Twitter

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