• @Controller used to mark a class as a web request handler. It’s mostly used with Spring MVC application.
• The @Controller annotation indicates that a particular class serves the role of a controller
• @RestController is a annotation that is combination of the @Controller and @ResponseBody annotations .
• In @RestController, we don’t need to use @ResponseBody on every handler method.

So the following two controller  should do the same.

@RestController= @Controller+@ResponseBody.

@Controller
@ResponseBody
public class MyController { }

@RestController
public class MyRestController { }