Bael 1273 Spring RSS Feed View (#4707)

* Added example for BAEL-1273 - rss feed with Spring.

* Fixed javadoc

* Removed useless SpringBootServletInitializer in RSS app's launcher

* Explicitely added Spring Boot starting class in pom.xml to prevent errors in package phase.

spring-mvc-java/src/main/java/com/baeldung/rss/RssFeedApplication.java

@@ -0,0 +1,23 @@
+package com.baeldung.rss;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+/**
+ * Spring Boot launcher for an application which exposes an RSS Feed.
+ * 
+ * @author Donato Rimenti
+ *
+ */
+@SpringBootApplication
+public class RssFeedApplication {
+
+	/**
+	 * Launches a Spring Boot application which exposes an RSS Feed.
+	 * 
+	 * @param args null
+	 */
+    public static void main(final String[] args) {
+        SpringApplication.run(RssFeedApplication.class, args);
+    }
+}

spring-mvc-java/src/main/java/com/baeldung/rss/RssFeedController.java

@@ -0,0 +1,32 @@
+package com.baeldung.rss;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.servlet.View;
+
+/**
+ * REST Controller which returns an RSS Feed created by {@link RssFeedView}.
+ * 
+ * @author Donato Rimenti
+ *
+ */
+@RestController
+public class RssFeedController {
+
+	/**
+	 * View used by this controller.
+	 */
+	@Autowired
+	private RssFeedView view;
+
+	/**
+	 * Returns an RSS Feed created by {@link #view}.
+	 * 
+	 * @return an RSS Feed
+	 */
+	@GetMapping("/rss")
+	public View getFeed() {
+		return view;
+	}
+}

spring-mvc-java/src/main/java/com/baeldung/rss/RssFeedView.java

@@ -0,0 +1,98 @@
+package com.baeldung.rss;
+
+import java.sql.Date;
+import java.time.Instant;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Map;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.springframework.stereotype.Component;
+import org.springframework.web.servlet.view.feed.AbstractRssFeedView;
+
+import com.rometools.rome.feed.rss.Channel;
+import com.rometools.rome.feed.rss.Item;
+
+/**
+ * View for a RSS feed.
+ * 
+ * @author Donato Rimenti
+ */
+@Component
+public class RssFeedView extends AbstractRssFeedView {
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see org.springframework.web.servlet.view.feed.AbstractFeedView#
+	 * buildFeedMetadata(java.util.Map, com.rometools.rome.feed.WireFeed,
+	 * javax.servlet.http.HttpServletRequest)
+	 */
+	@Override
+	protected void buildFeedMetadata(Map<String, Object> model, Channel feed, HttpServletRequest request) {
+		feed.setTitle("Baeldung RSS Feed");
+		feed.setDescription("Learn how to program in Java");
+		feed.setLink("http://www.baeldung.com");
+	}
+
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see org.springframework.web.servlet.view.feed.AbstractRssFeedView#
+	 * buildFeedItems(java.util.Map, javax.servlet.http.HttpServletRequest,
+	 * javax.servlet.http.HttpServletResponse)
+	 */
+	@Override
+	protected List<Item> buildFeedItems(Map<String, Object> model, HttpServletRequest request,
+			HttpServletResponse response) {
+
+		// Builds the single entries.
+		Item entryOne = new Item();
+		entryOne.setTitle("JUnit 5 @Test Annotation");
+		entryOne.setAuthor("donatohan.rimenti@gmail.com");
+		entryOne.setLink("http://www.baeldung.com/junit-5-test-annotation");
+		entryOne.setPubDate(Date.from(Instant.parse("2017-12-19T00:00:00Z")));
+
+		Item entryTwo = new Item();
+		entryTwo.setTitle("Creating and Configuring Jetty 9 Server in Java");
+		entryTwo.setAuthor("donatohan.rimenti@gmail.com");
+		entryTwo.setLink("http://www.baeldung.com/jetty-java-programmatic");
+		entryTwo.setPubDate(Date.from(Instant.parse("2018-01-23T00:00:00Z")));
+
+		Item entryThree = new Item();
+		entryThree.setTitle("Flyweight Pattern in Java");
+		entryThree.setAuthor("donatohan.rimenti@gmail.com");
+		entryThree.setLink("http://www.baeldung.com/java-flyweight");
+		entryThree.setPubDate(Date.from(Instant.parse("2018-02-01T00:00:00Z")));
+
+		Item entryFour = new Item();
+		entryFour.setTitle("Multi-Swarm Optimization Algorithm in Java");
+		entryFour.setAuthor("donatohan.rimenti@gmail.com");
+		entryFour.setLink("http://www.baeldung.com/java-multi-swarm-algorithm");
+		entryFour.setPubDate(Date.from(Instant.parse("2018-03-09T00:00:00Z")));
+
+		Item entryFive = new Item();
+		entryFive.setTitle("A Simple Tagging Implementation with MongoDB");
+		entryFive.setAuthor("donatohan.rimenti@gmail.com");
+		entryFive.setLink("http://www.baeldung.com/mongodb-tagging");
+		entryFive.setPubDate(Date.from(Instant.parse("2018-03-27T00:00:00Z")));
+
+		Item entrySix = new Item();
+		entrySix.setTitle("Double-Checked Locking with Singleton");
+		entrySix.setAuthor("donatohan.rimenti@gmail.com");
+		entrySix.setLink("http://www.baeldung.com/java-singleton-double-checked-locking");
+		entrySix.setPubDate(Date.from(Instant.parse("2018-04-23T00:00:00Z")));
+
+		Item entrySeven = new Item();
+		entrySeven.setTitle("Introduction to Dagger 2");
+		entrySeven.setAuthor("donatohan.rimenti@gmail.com");
+		entrySeven.setLink("http://www.baeldung.com/dagger-2");
+		entrySeven.setPubDate(Date.from(Instant.parse("2018-06-30T00:00:00Z")));
+
+		// Creates the feed.
+		return Arrays.asList(entryOne, entryTwo, entryThree, entryFour, entryFive, entrySix, entrySeven);
+	}
+
+}