后端分页操作-springboot （所有类型的数据通用）

springboot项目少不了对数据做统计报表，这个时候就会涉及到前后端分页操作。一般前端给后端传递当前页数和每页数据条数即可。

后端来实现分页的所有操作。最近有碰到，所有的操作总结如下：

一：pom文件中引入依赖。

<dependency>

       <groupId>com.github.pagehelper</groupId>

       <artifactId>pagehelper-spring-boot-starter</artifactId>

       <version>1.2.7</version>

</dependency>

 二：实体类文件夹下定义PageBean工具类（我的项目中是写在domains文件夹下）

package com.fykj.cloud.epaper.entity.bean;
import java.util.List;

/**
 * 分页bean
 */
public class PageBean<T> {
    // 当前页
    private Integer currentPage = 1;
    // 每页显示的总条数
    private Integer pageSize = 10;
    // 总条数
    private Integer totalNum;
    // 是否有下一页
    private Integer isMore;
    // 总页数
    private Integer totalPage;
    // 开始索引
    private Integer startIndex;
    // 分页结果
    private List<T> items;

    public PageBean() {
        super();
    }

    public PageBean(Integer currentPage, Integer pageSize, Integer totalNum) {
        super();
        this.currentPage = currentPage;
        this.pageSize = pageSize;
        this.totalNum = totalNum;
        this.totalPage = (this.totalNum+this.pageSize-1)/this.pageSize;
        this.startIndex = (this.currentPage-1)*this.pageSize;
        this.isMore = this.currentPage >= this.totalPage?0:1;
    }
    public PageBean(Integer currentPage, Integer pageSize, Integer totalNum,List<T> list){
        this(currentPage,pageSize, totalNum);
        this.items = list;
    }

    public Integer getCurrentPage() {
        return currentPage;
    }

    public void setCurrentPage(Integer currentPage) {
        this.currentPage = currentPage;
    }

    public Integer getPageSize() {
        return pageSize;
    }

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

    public Integer getTotalNum() {
        return totalNum;
    }

    public void setTotalNum(Integer totalNum) {
        this.totalNum = totalNum;
        this.totalPage = (this.totalNum+this.pageSize-1)/this.pageSize;
        this.startIndex = (this.currentPage-1)*this.pageSize;
        this.isMore = this.currentPage >= this.totalPage?0:1;
    }

    public Integer getIsMore() {
        return isMore;
    }

    public void setIsMore(Integer isMore) {
        this.isMore = isMore;
    }

    public Integer getTotalPage() {
        return totalPage;
    }

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

    public Integer getStartIndex() {
        return startIndex;
    }

    public void setStartIndex(Integer startIndex) {
        this.startIndex = startIndex;
    }

    public List<T> getItems() {
        return items;
    }

    public void setItems(List<T> items) {
        this.items = items;
    }
}
3.分页功能代码实现（service层及serviceImpl层）

service层

public PageBean<UserBlackList> selectUserBlackListList(Integer currentPage, Integer pageSize, UserBlackList userBlackList) ；

  service实现层

@Override
    public PageBean<UserBlackList> selectUserBlackListList(Integer currentPage, Integer pageSize, UserBlackList userBlackList) {
        try {
            PageBean<UserBlackList> entity = new PageBean();
            if (null != pageSize) {
                entity.setPageSize(pageSize);
            }
            if (null != currentPage) {
                entity.setCurrentPage(currentPage);
            }
            PageHelper.startPage(entity.getCurrentPage(), entity.getPageSize());
            List<UserBlackList> list = userBlackListMapper.queryModelList(userBlackList);//获取需要分页的所有数据
            Integer count = userBlackListMapper.queryModelListCount(userBlackList);//获取分页的数据总数
            entity.setItems(list);
            entity.setTotalNum(count);
            return entity;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }