物品分页的实体类

import lombok.*;

import java.util.List;
@Data

@NoArgsConstructor
@Getter
@Setter
public class PageBean<T> {
    private  int pageNum;
    private  int pageSize;
    private  long totalSize;
    private  int pageCount;
    private List<T> data;
    private  int startPage;
    private  int endPage;


    public PageBean(int pageNum, int pageSize, long totalSize, List<T> data) {
        this.pageNum = pageNum;
        this.pageSize = pageSize;
        this.totalSize = totalSize;
        this.data = data;
        //计算总页数
        this.pageCount=(int)(totalSize%pageSize==0?pageSize:totalSize/pageSize+1);
        //计算开始页和结束页
        //正常情况
        this.startPage = pageNum-4;
        this.endPage = pageNum+5;
        //特殊情况
        if(pageNum<5){
            this.startPage=1;
            this.endPage=10;
        }
        if(pageNum>(pageCount-5)){
            this.startPage = pageCount-9;
            this.endPage=pageCount;
        }
        if(pageNum<10){
            this.startPage=1;
            this.endPage=pageCount;
        }
    }
}