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페이지처리를 위한 DTO 설계

페이징 처리 설계

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PageResponseDTO

package org.zerock.apiserver.dto;

import lombok.Data;

import java.util.List;
import java.util.stream.Collectors;
import java.util.stream.IntStream;

@Data
public class PageResponseDTO<E> {

    private List<E> dtoList;

    private List<Integer> pageNumList;

    private PageRequestDTO pageRequestDTO;

    private boolean prev, next;

    private int totalCount, prevPage, nextPage, totalPage, current;

    public PageResponseDTO(List<E> dtoList, PageRequestDTO pageRequestDTO, long total) {
        this.dtoList = dtoList;
        this.pageRequestDTO = pageRequestDTO;
        this.totalCount = (int) total;

        // 끝페이지 end
        int end = (int)(Math.ceil(pageRequestDTO.getPage() / 10.0)) * 10;

        // 시작 페이지
        int start = end - 9;

        // 진짜 마지막 페이지
        int last = (int)(Math.ceil((totalCount / (double) pageRequestDTO.getSize())));

        end = (end > last) ? last : end;

        this.prev = start > 1;
        this.next = totalCount > end + pageRequestDTO.getSize();

        // 박싱
        this.pageNumList = IntStream.rangeClosed(start, end).boxed().collect(Collectors.toList());

        this.prevPage = prev ? start - 1 : 0;
        this.nextPage = next ? end + 1 : 0;
    }

}
Java
복사

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PageRequestDTO

package org.zerock.apiserver.dto;

import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.experimental.SuperBuilder;

@SuperBuilder
@Data
@AllArgsConstructor
@NoArgsConstructor
public class PageRequestDTO {

    @Builder.Default
    private int page = 1;
    
    private int size = 10;

}
Java
복사