如何通过SpringBoot rest api中的PUT方法更新类的特定字段

// 实体类
@Entity
public class User {
    @Id
    private Long id;
    private String name;
    private String email;
    // 其他字段和对应的getter/setter方法
}

// Repository接口
public interface UserRepository extends JpaRepository<User, Long> {
}

// Controller
@RestController
@RequestMapping("/users")
public class UserController {
    @Autowired
    private UserRepository userRepository;

    @PutMapping("/{id}")
    public ResponseEntity<String> updateUser(@PathVariable Long id, @RequestBody User updatedUser) {
        Optional<User> optionalUser = userRepository.findById(id);
        if (optionalUser.isPresent()) {
            User user = optionalUser.get();
            // 更新特定字段
            if (updatedUser.getName() != null) {
                user.setName(updatedUser.getName());
            }
            if (updatedUser.getEmail() != null) {
                user.setEmail(updatedUser.getEmail());
            }
            // 其他字段的更新逻辑

            userRepository.save(user);
            return ResponseEntity.ok("User updated successfully.");
        } else {
            return ResponseEntity.notFound().build();
        }
    }
}

{
    "name": "John Doe"
}