list分页，集合分页

package com.sensor.sellCabinet.util;

import lombok.Data;

import java.util.Collections;
import java.util.List;

@Data
public class Paging {

    private Integer total;//总条数
    private Integer totalPage;//总页数
    private Integer size;//每页条数
    private Integer current;//当前页码
    private Integer queryIndex;//当前页从第几条开始查

    public static Paging pagination(Integer total,Integer current,Integer pageSize){
        if(current==null || current<=0){
            current=1;
        }
        if(pageSize==null || pageSize<=0){
            pageSize=10;
        }
        Paging page = new Paging();
        page.setTotal(total);
        Integer totalPage = total % pageSize == 0 ? total / pageSize : total / pageSize + 1;
        page.setTotalPage(totalPage);
        page.setCurrent(current);
        page.setSize(pageSize);
        page.setQueryIndex(pageSize * (current-1));
        return page;
    }

    public  <T> List<T> subListt(List<T> t){
        int fromIndex = queryIndex;
        int toIndex = 0;
        if (fromIndex + getSize() >= total){
            toIndex = total;
        }else {
            toIndex = fromIndex + getSize();
        }
        if (fromIndex > toIndex){
            return Collections.EMPTY_LIST;
        }else{
            return t.subList(fromIndex,toIndex);
        }
    }
}

 

调用案例

Paging paging = Paging.pagination(normal.size(),current,size);
            data.put("normal",paging.subListt(normal));