Updating AccountController to use LdapUserDetailsService

We will now update the AccountController object to use the LdapDetailsUserDetailsService interface to look up the user that it displays:

    //src/main/java/com/packtpub/springsecurity/web/controllers/AccountController.java

    @Controller
    public class AccountController {
    private final UserDetailsService userDetailsService;
    @Autowired
    public AccountController(UserDetailsService userDetailsService) {
       this.userDetailsService = userDetailsService;
    }
    @RequestMapping("/accounts/my")
    public String view(Model model) {
       Authentication authentication = SecurityContextHolder.
       getContext().getAuthentication();
       // null check omitted
       String principalName = authentication.getName();
       Object principal = userDetailsService.
       loadUserByUsername(principalName);
       .....