如何在jpa springboot中使用Map作为带分页的查询参数

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

@Entity
@Table(name = "user")
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    
    private String name;
    
    private Integer age;
    
    // 省略构造方法、getter和setter
}

@Repository
public interface UserRepository extends JpaRepository<User, Long> {
    // 省略其他方法
}

@Service
public class UserService {
    @Autowired
    private UserRepository userRepository;
    
    public Page<User> getUsersByParams(Map<String, Object> params, Pageable pageable) {
        // 构建查询条件
        Specification<User> spec = (root, query, criteriaBuilder) -> {
            List<Predicate> predicates = new ArrayList<>();
            for (Map.Entry<String, Object> entry : params.entrySet()) {
                String key = entry.getKey();
                Object value = entry.getValue();
                predicates.add(criteriaBuilder.equal(root.get(key), value));
            }
            return criteriaBuilder.and(predicates.toArray(new Predicate[0]));
        };
        
        // 执行查询
        return userRepository.findAll(spec, pageable);
    }
}

@RestController
@RequestMapping("/users")
public class UserController {
    @Autowired
    private UserService userService;
    
    @GetMapping
    public Page<User> getUsers(@RequestParam Map<String, Object> params, Pageable pageable) {
        return userService.getUsersByParams(params, pageable);
    }
}

GET /users?page=0&size=10&name=John&age=25