Google owned blogging platform www.blogger.com providing a free way to manage blogs. It is following atom feed to provide sitemaps to search engines. This blog is also from blogger platform. You can submit this sitemap URL to google web master tools to have better SEO. Ok, now we will see how to generate Atom feed for Blogger blog. Observe below syntax
ExamplesSyntax
start-index and max-results will decide the atom feed content
<blog url>/atom.xml?redirect=false&start-index=1&max-results=50
Click on below link to get latest 3 articles feed
http://blog.sodhanalibrary.com/atom.xml?redirect=false&start-index=1&max-results=3
http://blog.sodhanalibrary.com/atom.xml?redirect=false&start-index=5&max-results=1
XML Structure
Atom feed gives data in XML format. Find below for format
<feed -----> ----- <entry> ----- <title>----</title> <category term="---"/> <category term="---"/> <content ----> ---- </content> </entry> </feed>
Java Program
import java.io.InputStream; import java.net.URL; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.xpath.XPath; import javax.xml.xpath.XPathConstants; import javax.xml.xpath.XPathExpression; import javax.xml.xpath.XPathFactory; import org.w3c.dom.Document; import org.w3c.dom.Node; import org.w3c.dom.NodeList; import org.xml.sax.SAXException; import org.xml.sax.SAXParseException; public class BloggerReader { static int FEED_COUNT = 50; public static void main(String[] args) { try { int START_INDEX = 1; while (true) { // Atom feed URL URL url = new URL( "http://blog.sodhanalibrary.com/atom.xml?redirect=false&start-index="+START_INDEX+"&max-results=" + FEED_COUNT); InputStream input = url.openStream(); // XPATH to get entries DocumentBuilderFactory factory = DocumentBuilderFactory .newInstance(); DocumentBuilder builder = factory.newDocumentBuilder(); Document doc = builder.parse(input); XPathFactory xPathfactory = XPathFactory.newInstance(); XPath xpath = xPathfactory.newXPath(); XPathExpression expr = xpath.compile("/feed/entry"); // Get Nodelist of entries NodeList nl = (NodeList) expr.evaluate(doc, XPathConstants.NODESET); // iterate Nodelist for (int i = 0; i < nl.getLength(); i++) { NodeList nl1 = nl.item(i).getChildNodes(); // iterate child nodes for (int j = 0; j < nl1.getLength(); j++) { Node node = nl1.item(j); if (node.getNodeName().equals("title")) { // print title System.out.println(node.getTextContent()); } else if (node.getNodeName().equals("category")) { // print categories System.out.println(node.getAttributes() .getNamedItem("term").getTextContent()); } } } START_INDEX += FEED_COUNT; if(FEED_COUNT > nl.getLength()) { break; }; } } catch (SAXParseException err) { err.printStackTrace(); } catch (SAXException e) { e.printStackTrace(); } catch (Throwable t) { t.printStackTrace(); } } }
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