[따라하기] 3-6. 페이지네이션

import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.PageRequest;

    @Data
    public static class PageDTO {
        private Integer number; // 현재페이지
        private Integer totalPage; // 전체페이지 개수
        private Integer size; // 한페이지에 아이템 개수
        private Boolean first;
        private Boolean last;
        private Integer prev; // 현재페이지 -1
        private Integer next; // 현재페이지 +1
        private List<Integer> numbers = new ArrayList<>();
        private List<Content> contents = new ArrayList<>();
        private String keyword;

        public PageDTO(Page<Board> boardPG, String title) {
            this.keyword = title;
            this.number = boardPG.getNumber();
            this.totalPage = boardPG.getTotalPages();
            this.size = boardPG.getSize();
            this.first = boardPG.isFirst();
            this.last = boardPG.isLast();
            this.prev = boardPG.getNumber()-1;
            this.next = boardPG.getNumber()+1;
            int temp = (number / 3)*3; // 0 -> 0, 3 -> 3, 6 -> 6

            for(int i=temp; i<temp+3; i++){ // 0
                this.numbers.add(i);
            }
            for (Board board : boardPG.getContent()){
                contents.add(new Content(board));
            }
        }

        @Data
        class Content {
            private Integer id;
            private String title;

            public Content(Board board) {
                this.id = board.getId();
                this.title = board.getTitle();
            }
        }
    }