@RequestMapping:
This provides the routing information and informs Spring that any HTTP request matching the URL must be mapped to the respective method.
org.springframework.web.bind.annotation.RequestMapping has to be imported to use this annotation.
@RestController:
This is applied to a class to mark it as a request handler thereby creating RESTful web services using Spring MVC. This annotation adds the @ResponseBody and @Controller annotation to the class.
org.springframework.web.bind.annotation.RestController has to be imported to use this annotation.
