无法将Spring boot与MongoDb连接

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>

spring.data.mongodb.host=localhost
spring.data.mongodb.port=27017
spring.data.mongodb.database=mydatabase

@Document(collection = "users")
public class User {
    @Id
    private String id;
    private String name;
    // 其他属性和方法
}

public interface UserRepository extends MongoRepository<User, String> {
    // 可以定义一些自定义的查询方法
}

@Service
public class UserService {
    @Autowired
    private UserRepository userRepository;

    public User saveUser(User user) {
        return userRepository.save(user);
    }

    public List<User> getAllUsers() {
        return userRepository.findAll();
    }

    // 其他操作方法
}