Java – how to set the correct last modified header value for spring Web Services cached using spring cache?

I have a spring MVC controller:

@Controller
@RequestMapping(value = "/user")
public class UserController {
   .....      
   @Cacheable(value = "users",key = "#id")
   @RequestMapping(value = "/get",method = RequestMethod.GET)
   @ResponseBody
   public User getUser(Long id){
       return userService.get(id);
   }
   ....
}

I want to add the title last modified to the HTTP response of getuser web service How do I get the correct date when adding a cache in my store? How do I add the last modified title of this date to the response of the spring controller method?

Solution

How's this?

@Controller
@RequestMapping(value = "/user")
class UserController {

    @Cacheable(value = "users",key = "#id")
    @RequestMapping(value = "/get",method = RequestMethod.GET)
    @ResponseBody
    public ResponseEntity<User> getUser(Long id) {
        HttpHeaders headers = new HttpHeaders();
        headers.set("Last-Modified",dateFormat.format(new Date()));
        return new ResponseEntity<SecurityProperties.User>(headers,userService.get(id),HttpStatus.OK);
    }
}