如何在JpaSpecificationExecutor#findAll中以数值形式按字符串字段排序

import org.springframework.data.jpa.domain.Specification;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.JpaSpecificationExecutor;
import org.springframework.data.domain.Sort;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Predicate;
import javax.persistence.criteria.Root;

// 自定义Specification类
public class CustomSpecification<T> implements Specification<T> {

    private String field; // 需要排序的字段

    public CustomSpecification(String field) {
        this.field = field;
    }

    @Override
    public Predicate toPredicate(Root<T> root, CriteriaQuery<?> query, CriteriaBuilder criteriaBuilder) {
        return criteriaBuilder.isNotNull(root.get(field));
    }
}

// 自定义Repository接口继承JpaRepository和JpaSpecificationExecutor
public interface CustomRepository<T> extends JpaRepository<T, Long>, JpaSpecificationExecutor<T> {

}

// 使用自定义Specification进行排序查询
public class CustomService {

    private CustomRepository<YourEntity> repository;

    public List<YourEntity> findAllByField(String field) {
        Specification<YourEntity> specification = new CustomSpecification<>(field);
        Sort sort = Sort.by(Sort.Direction.ASC, field); // 指定字段升序排序
        return repository.findAll(specification, sort);
    }
}