Java 分页工具类

import java.util.ArrayList;
import java.util.List;

/**
 * 功能：分页工具类
 */


public class PageBean<T> {
    private int pageSize; // 每页记录数
    private int pageNo; // 当前页
    private int totalPages; // 总页数
    private int totalRecords; // 总记录数
    private List<T> list;

    public int getPageSize() {
        return pageSize;
    }

    // 设置每页记录数
    public void setPageSize(int pageSize) {
        if (pageSize > 0) {
            this.pageSize = pageSize;
        } else {
            this.pageSize = 10;
        }
    }

    public int getPageNo() {
        return pageNo;
    }

    // 设置当前页
    public void setPageNo(int pageNo) {
        if (pageNo <= 1) {
            this.pageNo = 1;
        } else if (pageNo > this.totalPages) {
            this.pageNo = this.totalPages;
        } else {
            this.pageNo = pageNo;
        }
    }

    public int getTotalPages() {
        return totalPages;
    }

    // 设置总页数
    public void setTotalPages() {
        this.totalPages = this.totalRecords % this.pageSize == 0 ? this.totalRecords / this.pageSize
                : this.totalRecords / this.pageSize + 1;
    }

    public int getTotalRecords() {
        return totalRecords;
    }

    // 设置总记录数
    public void setTotalRecords(int totalRecords) {
        if (totalRecords >= 0) {
            this.totalRecords = totalRecords;
        } else {
            this.totalRecords = 0;
        }
    }

    public List<T> getList() {
        return list;
    }

    public void setList(List<T> list) {
        this.list = list;
    }

    // 当前页记录列表
    public void queryPager(int pageNo, int pageSize, List<T> list) {
        // 设置总记录数
        if (list != null && list.size() != 0) {
            this.setTotalRecords(list.size());
        } else {
            this.setTotalRecords(0);
        }
        // 设置每页记录数
        this.setPageSize(pageSize);
        // 设置总页数
        this.setTotalPages();
        // 设置当前页
        this.setPageNo(pageNo);
        // 设置当前页记录数
        if (list != null && list.size() != 0) {
            if (pageNo == this.totalPages) {
                this.list = list.subList((pageNo - 1) * pageSize, this.totalRecords);
            } else {
                this.list = list.subList((pageNo - 1) * pageSize, pageNo * pageSize);
            }
        } else {
            this.list = new ArrayList<>();
        }

    }

    public boolean isPrePage() {
        if (this.pageNo > 1) {
            return true;
        }
        return false;
    }

    public boolean isNextPage() {
        if (this.pageNo < this.totalPages) {
            return true;
        }
        return false;
    }

    public int getPrePageNo() {
        if (isPrePage()) {
            return this.pageNo - 1;
        }
        return this.pageNo;
    }

    public int getNextPageNo() {
        if (isNextPage()) {
            return this.pageNo + 1;
        }
        return this.pageNo;
    }
}

使用方法（控制层）

    public PageBean authorRankingList(@RequestParam(value = "page", defaultValue = "1") Integer page,
                                      @RequestParam(value = "pageSize", defaultValue = "20") Integer pageSize) {

        List<HelpcenterArticle> list = helpcenterArticleService.queryAuthorInfoList();
        if (CollectionUtils.isNotEmpty(list)) {
            PageBean<HelpcenterArticle> bean = new PageBean<>();
            bean.queryPager(page, pageSize, list);
            return bean;
        }
        return null;
    }