spring page 처리하기 -정렬(sort) 포함

service - interface

    PostResponse getAllPost(int pageNo, int pageSize, String sortBy, String sortDir);

 

service implemetation ; ==> PostResponse를 정의

 

    @Override
    public PostResponse getAllPost(int pageNo, int pageSize, String sortBy, String sortDir) {

        Sort sort = sortDir.equalsIgnoreCase(Sort.Direction.ASC.name())
                ? Sort.by(sortBy).ascending() : Sort.by(sortBy).descending();
        //create Pageable instance
        Pageable pageable = PageRequest.of(pageNo, pageSize, sort);
        Page<Post> posts = postRepository.findAll(pageable);

        List<Post> listOfPosts = posts.getContent();
        List<PostDto> content = listOfPosts.stream().map(this::mapToDto).toList();
        PostResponse postResponse = new PostResponse();
        postResponse.setContent(content);
        postResponse.setPageNo(posts.getNumber());
        postResponse.setPageSize(posts.getSize());
        postResponse.setTotalElements(posts.getTotalElements());
        postResponse.setTotalPages(posts.getTotalPages());
        postResponse.setLast(posts.isLast());
        return postResponse;
    }
    // pageable에 있는 항목 임.
@Data
@AllArgsConstructor
@NoArgsConstructor
public class PostResponse {
    private List<PostDto> content;
    private int pageNo;
    private int pageSize;
    private long totalElements;
    private int totalPages;
    private boolean last;
}

 

controller 처리

 

    @GetMapping
    public PostResponse getPost(
            @RequestParam(value = "pageNo", defaultValue = AppConstants.DEFAULT_PAGE_NUMBER,
                    required = false) int page,
            @RequestParam(value = "pageSize", defaultValue = AppConstants.DEFAULT_PAGE_SIZE,
                    required = false) int size,
            @RequestParam(value = "sortBy", defaultValue = AppConstants.DEFAULT_SORT_BY,
                    required = false) String sortBy,
            @RequestParam(value = "sortDir", defaultValue = AppConstants.DEFAULT_SORT_DIR,
                    required = false) String sortDir) {
        return postService.getAllPost(page, size, sortBy, sortDir);
    }
    ==> 출력은 PostReponse 형태로 나타남