public interface WinesWorldnetCultureRepository extends JpaRepository<WinesWorldnetCulture,Long>, 
						JpaSpecificationExecutor<WinesWorldnetCulture> {
}

@Service
public class WinesWorldnetCultureService {
    @Autowired
    private WinesWorldnetCultureRepository repository;
    public static Integer total = null;
    public List<WinesWorldnetCulture> getPageData(Integer pageNum, Integer pageSize, String title){
        // 構(gòu)造條件查詢，根據(jù)名稱查詢
        Specification<WinesWorldnetCulture> spec = new Specification() {
            @Override
            public Predicate toPredicate(Root root, CriteriaQuery query, CriteriaBuilder builder) {
                return query.where(builder.equal(root.get("title"),title)).getRestriction();
            }
        };
        List<WinesWorldnetCulture> winesWorldnetCultureList = null;
        if (Objects.isNull(pageNum)|| Objects.isNull(pageSize)){
            // 判斷分頁(yè)查詢條件是否為空，若為空，則查詢所有數(shù)據(jù)，否則，根據(jù)條件進(jìn)行查詢
            return StrUtil.isBlank(title)? repository.findAll(): repository.findAll(spec);
        }
        // 如果頁(yè)數(shù)小于1，則設(shè)置頁(yè)數(shù)為1
        if (pageNum<1){
            pageNum=1;
        }
        // 起始頁(yè)為第 0 頁(yè)，進(jìn)行條件分頁(yè)查詢操作
        // 構(gòu)建分頁(yè)查詢
        PageRequest pageRequest = PageRequest.of(pageNum-1,pageSize);
        Page<WinesWorldnetCulture> winesWorldnetCulturePage = null;
        if (StrUtil.isBlank(title)){
         	// 分頁(yè)查詢操作
            winesWorldnetCulturePage = repository.findAll(pageRequest);
        }else {
        	// 分頁(yè)加條件查詢
            winesWorldnetCulturePage = repository.findAll(spec, pageRequest);
        }
        winesWorldnetCultureList = winesWorldnetCulturePage.getContent();
        total = winesWorldnetCulturePage.getTotalPages();
        return winesWorldnetCultureList;
    }
}

// 構(gòu)造條件查詢，根據(jù)名稱查詢
Specification<WinesWorldnetCulture> spec = new Specification() {
    @Override
    public Predicate toPredicate(Root root, CriteriaQuery query, CriteriaBuilder builder) {
    	// 支持鏈?zhǔn)骄幊?
        return query.where(builder.equal(root.get("title"),title)).getRestriction();
    }

// 分頁(yè)查詢頁(yè)數(shù)默認(rèn)是第0頁(yè)開(kāi)始
PageRequest pageRequest = PageRequest.of(pageNum-1,pageSize);