六、PagingAndSortingRepository接口
前言：該接口提供了分頁(yè)與排序的操作，該接口繼承了CrudRepository

1、持久層接口：

public interface UserRepositoryPagingAndSorting extends PagingAndSortingRepository<Users,Integer> { }

測(cè)試代碼

@RunWith(SpringRunner.class) @SpringBootTest public class UserRepositoryPagingAndSortingTest {@Autowiredprivate UserRepositoryPagingAndSorting userRepositoryPagingAndSorting;/*** RepositoryPagingAndSorting 接口排序*/@Testpublic void pagingAndSorting() {//order 定義排序規(guī)則Sort.Order order = new Sort.Order(Sort.Direction.DESC, "id");//sort對(duì)象封裝了排序規(guī)則Sort sort = new Sort(order);List<Users> list = (List<Users>) userRepositoryPagingAndSorting.findAll(sort); // Iterable<Users> list = userRepositoryPagingAndSorting.findAll(sort);for (Users users : list) {System.out.println(users);}}/*** RepositoryPagingAndSorting 接口 分頁(yè)*/@Testpublic void pagingAndSorting2() { // Pageable:封裝了分頁(yè)的參數(shù)，當(dāng)前頁(yè)，每頁(yè)顯示的條數(shù)，他的當(dāng)前頁(yè)是從0開(kāi)始的 // PageRequest(page,size): page 當(dāng)前頁(yè) size 每頁(yè)顯示的條數(shù)//第一頁(yè) 顯示數(shù)量2 如果不夠2條就顯示應(yīng)有條數(shù) // Pageable pageable = new PageRequest(0, 2);Pageable pageable = new PageRequest(1, 2); // 返回值Page對(duì)象Page<Users> page = userRepositoryPagingAndSorting.findAll(pageable);System.out.println("總條數(shù):" + page.getTotalElements());System.out.println("總頁(yè)數(shù):" + page.getTotalPages());List<Users> list = page.getContent();for (Users users : list) {System.out.println(users);}}/*** RepositoryPagingAndSorting 接口 排序+分頁(yè)*/@Testpublic void pagingAndSorting3() {Sort sort = new Sort(Sort.Direction.DESC, "id");Pageable pageable = new PageRequest(0, 2, sort);Page<Users> page = userRepositoryPagingAndSorting.findAll(pageable);System.out.println("總條數(shù):" + page.getTotalElements());System.out.println("總頁(yè)數(shù):" + page.getTotalPages());List<Users> list = page.getContent();for (Users users : list) {System.out.println(users);}} }

本文源碼下載：

github地址：
https://github.com/gb-heima/Spring-Boot-Actual-Combat/tree/master/parent/spring-boot-chapter-9

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