@Service
public class StudentSpecService {
    @Autowired
    StudentRepository repository;
   
    public Page findByPage(Integer pageNo, Integer size, String searchField, String searchKey, String sortField) {
        //定义查询条件
        Specification<StudentEntity> spec = (root, criteriaQuery, criteriaBuilder) -> {
            Path attr = root.get(searchField); // 查询表中的该字段
            //criteriaBuilder有多种方法用于和attr匹配
            Predicate predicate = criteriaBuilder.equal(attr, searchKey); 
            return predicate;
        };
        //定义排序字段选择使用倒序
        Sort sort = Sort.by(Sort.Direction.DESC, sortField);
        //定义pageable对象
        Pageable pageable = PageRequest.of(pageNo, size, sort);
        Page<StudentEntity> pages = repository.findAll(spec, pageable);
        return pages;
    }

}

 

在执行上一步之前，需要保证StudentRepository接口实现了JpaSpecificationExecutor：

1 public interface StudentRepository extends JpaRepository<StudentEntity,String>, JpaSpecificationExecutor<StudentEntity> {
2 
3 }