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public class UserService { public User getUserById(long userId) { // trả về user theo id } }
public class UserController { @GetMapping("/users/{userId}") public User getUserById(@PathVariable long userId) { UserService service = new UserService(); return userService.getUserById(userId); } }
UserController
UserService
UserRepository
1.Tiêu tốn tài nguyên bộ nhớ
2.Hiệu suất kém
3.Lỗi OutOfMemoryError
@Service public class UserService { public User getUserById(long userId) { // Trả về user theo id } } @Controller public class UserController { @Autowired private UserService userService; @GetMapping("/users/{userId}") public User getUserById(@PathVariable long userId) { return userService.getUserById(userId); } }
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