Add update/delete to the web-ui sample

Closes gh-4735
See gh-4733

spring-boot-samples/spring-boot-sample-web-ui/src/main/java/sample/web/ui/mvc/MessageController.java

@@ -30,6 +30,7 @@ import org.springframework.web.servlet.mvc.support.RedirectAttributes;
 
 /**
  * @author Rob Winch
+ * @author Doo-Hwan Kwak
  */
 @Controller
 @RequestMapping("/")
@@ -73,4 +74,16 @@ public class MessageController {
 		throw new RuntimeException("Expected exception in controller");
 	}
 
+	@RequestMapping(value = "delete/{id}")
+	public ModelAndView delete(@PathVariable("id") Long id) {
+		this.messageRepository.deleteMessage(id);
+		Iterable<Message> messages = this.messageRepository.findAll();
+		return new ModelAndView("messages/list", "messages", messages);
+	}
+
+	@RequestMapping(value = "modify/{id}", method = RequestMethod.GET)
+	public ModelAndView modifyForm(@PathVariable("id") Message message) {
+		return new ModelAndView("messages/form", "message", message);
+	}
+
 }