What is Atom?
Atom
is an XML Document that describe list of related information known as feeds.
What is feed?
Feed
is a collection of entries each with an extensible set of attached metadata.
Example
<?xml version='1.0' encoding='UTF-8'?> <feed xmlns="http://www.w3.org/2005/Atom"> <id>tag:blogger.com,1999:blog-3062500619105519975</id> <updated>2016-12-16T09:38:32.994Z</updated> <title type="text">java tutorial : Blog to learn java programming</title> <subtitle type="text">Learners Blog</subtitle> <link href="https://self-learning-java-tutorial.blogspot.com/feeds/posts/default" rel="http://schemas.google.com/g/2005#feed" type="application/atom+xml" title="" hreflang="" length="0"/> <link href="http://www.blogger.com/feeds/3062500619105519975/posts/default?alt=atom" rel="self" type="application/atom+xml" title="" hreflang="" length="0"/> <author> <name>hari krishna</name> <email>noreply@blogger.com</email> <uri></uri> </author> <entry> <id>tag:blogger.com,1999:blog-3062500619105519975.post-918659526208416960</id> <published>2016-12-16T09:38:33.018Z</published> <title type="text">SWT: Slider</title> <content type="html">Slider class is used to define Slider widget</content> </entry> </feed>
Following
code generates above feed. I am using Abdera library to work with atom
protocol.
HelloWorld.java
import java.io.IOException; import java.util.Date; import org.apache.abdera.Abdera; import org.apache.abdera.model.Content.Type; import org.apache.abdera.model.Entry; import org.apache.abdera.model.Feed; import org.apache.abdera.model.Text; import org.apache.abdera.writer.Writer; public class HelloWorld { private static void addMetaData(Feed feed) { feed.setId("tag:blogger.com,1999:blog-3062500619105519975"); feed.setUpdated(new Date()); feed.setTitle("java tutorial : Blog to learn java programming"); feed.setSubtitle("Learners Blog"); } private static void addLinksToFeed(Feed feed) { /* Adding Links */ String rel = "http://schemas.google.com/g/2005#feed"; String type = "application/atom+xml"; String href = "https://self-learning-java-tutorial.blogspot.com/feeds/posts/default"; String title = ""; String hreflang = ""; long length = 0; feed.addLink(href, rel, type, title, hreflang, length); rel = "self"; type = "application/atom+xml"; href = "http://www.blogger.com/feeds/3062500619105519975/posts/default?alt=atom"; feed.addLink(href, rel, type, title, hreflang, length); } private static void addAuthorToFeed(Feed feed) { String name = "hari krishna"; String email = "noreply@blogger.com"; feed.addAuthor(name, email, ""); } private static void addEntry(Feed feed) { Entry entry = feed.addEntry(); entry.setId("tag:blogger.com,1999:blog-3062500619105519975.post-918659526208416960"); entry.setPublished(new Date()); entry.setTitle("SWT: Slider", Text.Type.TEXT); entry.setContent("Slider class is used to define Slider widget", Type.HTML); feed.addEntry(entry); } public static void main(String args[]) throws IOException { Abdera abdera = new Abdera(); /* Create a new Feed instance. */ Feed feed = abdera.newFeed(); /* Populate feed */ addMetaData(feed); addLinksToFeed(feed); addAuthorToFeed(feed); addEntry(feed); /* Print the feed to console */ Writer writer = abdera.getWriterFactory().getWriter("prettyxml"); feed.writeTo(writer, System.out); } }
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