Add websocket example

spring-mvc-java/src/main/java/org/baeldung/model/Message.java

@@ -0,0 +1,10 @@
+package org.baeldung.model;
+
+public class Message {
+
+	private String text;
+
+	public String getText() {
+		return text;
+	}
+}

spring-mvc-java/src/main/java/org/baeldung/model/OutputMessage.java

@@ -0,0 +1,20 @@
+package org.baeldung.model;
+
+public class OutputMessage {
+
+	private String text;
+	private String time;
+
+	public OutputMessage(final String text, final String time) {
+		this.text = text;
+		this.time = time;
+	}
+
+	public String getText() {
+		return text;
+	}
+
+	public String getTime() {
+		return time;
+	}
+}

spring-mvc-java/src/main/java/org/baeldung/spring/web/config/WebSocketConfig.java

@@ -0,0 +1,24 @@
+package org.baeldung.spring.web.config;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.messaging.simp.config.MessageBrokerRegistry;
+import org.springframework.web.socket.config.annotation.AbstractWebSocketMessageBrokerConfigurer;
+import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker;
+import org.springframework.web.socket.config.annotation.StompEndpointRegistry;
+
+@Configuration
+@EnableWebSocketMessageBroker
+public class WebSocketConfig extends AbstractWebSocketMessageBrokerConfigurer {
+
+	@Override
+	public void configureMessageBroker(final MessageBrokerRegistry config) {
+		config.enableSimpleBroker("/topic");
+		config.setApplicationDestinationPrefixes("/app");
+	}
+
+	@Override
+	public void registerStompEndpoints(final StompEndpointRegistry registry) {
+		registry.addEndpoint("/chat").withSockJS();
+	}
+
+}

spring-mvc-java/src/main/java/org/baeldung/web/controller/ChatController.java

@@ -0,0 +1,30 @@
+package org.baeldung.web.controller;
+
+import java.text.SimpleDateFormat;
+import java.util.Date;
+
+import org.baeldung.model.Message;
+import org.baeldung.model.OutputMessage;
+import org.springframework.messaging.handler.annotation.MessageMapping;
+import org.springframework.messaging.handler.annotation.SendTo;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+
+@Controller
+public class ChatController {
+
+	@RequestMapping(value = "/showChat", method = RequestMethod.GET)
+	public String displayChat() {
+		return "chat";
+	}
+
+	@MessageMapping("/chat")
+	@SendTo("/topic/")
+	public OutputMessage send(final Message message) throws Exception {
+
+		final String time = new SimpleDateFormat("HH:mm").format(new Date());
+		return new OutputMessage(message.getText(), time);
+	}
+
+}