CODEWITHSUNDEEP
javaspringspring-boot
A_B
A_B

Reputation: 1019

Spring Boot - Save User between Controller Methods

What's the best approach to avoid repeating the same userService DB lookup over and over again in my controller methods?

I'm using Spring Boot 1.5.2 with spring-boot-starter-security and spring-boot-starter-thymeleaf for templating.

I tried adding an instance variable for SecurityContextHolder.getContext().getAuthentication() but it gave me a NullPointerException. 

@Controller
public class DashboardController {

    @Autowired
    private UserService userService;

    @Value("${product.name}")
    private String productName;


    @RequestMapping(value="/dashboard", method = RequestMethod.GET)
    public ModelAndView home() {
      ModelAndView modelAndView = new ModelAndView();
      Authentication auth = SecurityContextHolder.getContext().getAuthentication();
      User user = userService.findUserByEmail(auth.getName());

      modelAndView.addObject("email", user.getEmail());

      modelAndView.setViewName("dashboard");

      return modelAndView;
    }

    @RequestMapping(value="/dashboard/faq", method = RequestMethod.GET)
    public ModelAndView faq(){
      ModelAndView modelAndView = new ModelAndView();
      Authentication auth = SecurityContextHolder.getContext().getAuthentication();
      User user = userService.findUserByEmail(auth.getName());

      modelAndView.addObject("email", user.getEmail());
      modelAndView.addObject("productname", productName);

      modelAndView.setViewName("faq");

      return modelAndView;
   }

Upvotes: 0

Views: 951

Answers (1)

Leon Radley
Leon Radley

Reputation: 7682

If you want to get at the user that is stored in the session, you can use this annotation:

@RequestMapping("/me")
public User me(@AuthenticationPrincipal User user) {
    return user;
}

If you then want the user to always be available in thymeleaf I would use a @ControllerAdvice

@ControllerAdvice(annotations = Controller.class)
public class GlobalVariablesControllerAdvice {

    @ModelAttribute("user")
    public User user() {
        Authentication auth = SecurityContextHolder.getContext().getAuthentication();

        User user = null;
        // get user from authentication, but make sure to check for nulls

        return user;
    }

}

Upvotes: 2

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