Java实现手动对list集合进行分页

一、创建分页类

package com.huakunwk.club.util;

/**
 * @author [email protected]
 * @date 2018/6/6 14:53
 */
public class Paging {
    private Integer totalNum;//总条数
    private Integer totalPage;//总页数
    private Integer pageSize;//每页条数
    private Integer pageIndex;//当前页码
    private Integer queryIndex;//当前页从第几条开始查

    public static Paging pagination(Integer totalNum,Integer pageSize,Integer pageIndex){
        Paging page = new Paging();
        page.setTotalNum(totalNum);
        Integer totalPage = totalNum % pageSize == 0 ? totalNum / pageSize : totalNum / pageSize + 1;
        page.setTotalPage(totalPage);
        page.setPageIndex(pageIndex + 1);
        page.setPageSize(pageSize);
        page.setQueryIndex(pageSize * pageIndex);
        return page;
    }

    public Integer getTotalNum() {
        return totalNum;
    }

    public void setTotalNum(Integer totalNum) {
        this.totalNum = totalNum;
    }

    public Integer getTotalPage() {
        return totalPage;
    }

    public void setTotalPage(Integer totalPage) {
        this.totalPage = totalPage;
    }

    public Integer getPageSize() {
        return pageSize;
    }

    public void setPageSize(Integer pageSize) {
        this.pageSize = pageSize;
    }

    public Integer getPageIndex() {
        return pageIndex;
    }

    public void setPageIndex(Integer pageIndex) {
        this.pageIndex = pageIndex;
    }

    public Integer getQueryIndex() {
        return queryIndex;
    }

    public void setQueryIndex(Integer queryIndex) {
        this.queryIndex = queryIndex;
    }
}

二、手动对集合进行分页：

//手动对集合进行分页

List clubs = clubMapper.searchByCondition();//从数据库查询的集合数据

Paging paging = Paging.pagination(clubs.size(),pageSize,pageIndex);
int fromIndex = paging.getQueryIndex();
int toIndex = 0;
if (fromIndex + paging.getPageSize() >= clubs.size()){
    toIndex = clubs.size();
}else {
    toIndex = fromIndex +  paging.getPageSize();
}
if (fromIndex > toIndex){
    return Collections.EMPTY_LIST;
}
return clubs.subList(fromIndex,toIndex);