在请求正文Spring Boot中仅传递id或整个实体

@RestController
@RequestMapping("/users")
public class UserController {

    @Autowired
    private UserService userService;

    @PutMapping("/{id}")
    public ResponseEntity<User> updateUser(@PathVariable Long id, @RequestBody Map<String, Object> updates) {
        User updatedUser = userService.updateUser(id, updates);
        return ResponseEntity.ok(updatedUser);
    }
}

@RestController
@RequestMapping("/users")
public class UserController {

    @Autowired
    private UserService userService;

    @PostMapping
    public ResponseEntity<User> createUser(@RequestBody User user) {
        User createdUser = userService.createUser(user);
        return ResponseEntity.ok(createdUser);
    }

    @PutMapping("/{id}")
    public ResponseEntity<User> updateUser(@PathVariable Long id, @RequestBody User user) {
        User updatedUser = userService.updateUser(id, user);
        return ResponseEntity.ok(updatedUser);
    }
}

public User updateUser(Long id, Map<String, Object> updates) {
    Optional<User> optionalUser = userRepository.findById(id);
    if (optionalUser.isPresent()) {
        User user = optionalUser.get();
        // Apply updates
        return userRepository.save(user);
    } else {
        throw new ResourceNotFoundException("User not found with id: " + id);
    }
}

public User updateUser(Long id, User user) {
    Optional<User> optionalUser = userRepository.findById(id);
    if (optionalUser.isPresent()) {
        User existingUser = optionalUser.get();
        // Apply updates only if fields are present in the request
        if (user.getName() != null) existingUser.setName(user.getName());
        if (user.getEmail() != null) existingUser.setEmail(user.getEmail());
        return userRepository.save(existingUser);
    } else {
        throw new ResourceNotFoundException("User not found with id: " + id);
    }
}