Springboot+Mybatis实现分页查询

Springboot+Mybatis实现分页查询

话不多说直接上代码！

pom.xml

 <!--分页插件-->
          <dependency>
                <groupId>com.github.pagehelper</groupId>
                <artifactId>pagehelper-spring-boot-starter</artifactId>
                <version>1.1.1</version>
            </dependency>  

创建一个实体类(存放分页的属性) 直接拿代码，不需要修改

import com.github.pagehelper.Page;

import java.io.Serializable;
import java.util.Collection;
import java.util.List;

/**
 * @描叙： 分页 数据结构
 */
public class PageInfo<T> implements Serializable {
    private static final long serialVersionUID = 1L;
    
    //当前页
    private int pageNum;
    //每页的数量
    private int pageSize;
    //总记录数
    private long total;
    //总页数
    private int pages;
    //结果集
    private List<T> list;
    //是否为第一页
    private boolean isFirstPage = false;
    //是否为最后一页
    private boolean isLastPage = false;


    public PageInfo() {
    }

    /**
     * 包装Page对象
     *
     * @param list
     */
    public PageInfo(List<T> list) {
        if (list instanceof Page) {
            Page page = (Page) list;
            this.pageNum = page.getPageNum();
            this.pageSize = page.getPageSize();

            this.pages = page.getPages();
            this.list = page;
            this.total = page.getTotal();
        } else if (list instanceof Collection) {
            this.pageNum = 1;
            this.pageSize = list.size();

            this.pages = 1;
            this.list = list;
            this.total = list.size();
        }
        if (list instanceof Collection) {
            //判断页面边界
            judgePageBoudary();
        }
    }

    /**
     * 判定页面边界
     */
    private void judgePageBoudary() {
        isFirstPage = pageNum == 1;
        isLastPage = pageNum == pages;
    }

    public int getPageNum() {
        return pageNum;
    }

    public void setPageNum(int pageNum) {
        this.pageNum = pageNum;
    }

    public int getPageSize() {
        return pageSize;
    }

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

    public long getTotal() {
        return total;
    }

    public void setTotal(long total) {
        this.total = total;
    }

    public int getPages() {
        return pages;
    }

    public void setPages(int pages) {
        this.pages = pages;
    }

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

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

    public boolean isIsFirstPage() {
        return isFirstPage;
    }

    public void setIsFirstPage(boolean isFirstPage) {
        this.isFirstPage = isFirstPage;
    }

    public boolean isIsLastPage() {
        return isLastPage;
    }

    public void setIsLastPage(boolean isLastPage) {
        this.isLastPage = isLastPage;
    }

    @Override
    public String toString() {
        final StringBuffer sb = new StringBuffer("PageInfo{");
        sb.append("pageNum=").append(pageNum);
        sb.append(", pageSize=").append(pageSize);
        sb.append(", total=").append(total);
        sb.append(", pages=").append(pages);
        sb.append(", list=").append(list);
        sb.append(", isFirstPage=").append(isFirstPage);
        sb.append(", isLastPage=").append(isLastPage);
        sb.append(", navigatepageNums=");
        sb.append('}');
        return sb.toString();
    }
}

Controller层

    @RequestMapping(value = "", method = RequestMethod.POST)
	@ResponseBody
	public PageInfo<Notice>  方法名 (@RequestBody Map<String , Object> mp){
	//调用 ==Service==的方法  传参（页数，条数，对象参数）
	//Page<Notice>  Notice 接受的对象类型  泛型一定要写对
		Page<Notice> articles = noticeService.noticeLikeAll((Integer)mp.get("pageNum"),10,(String)mp.get("record"));
		PageInfo<Notice> pageInfo = new PageInfo<>(articles);
        return pageInfo;
	};

Service层

  Page<Notice> noticeLikeAll(页数, 条数,对象);

Service实现类

@Override
	public Page<Notice> noticeLikeAll(Integer pageNum, Integer pageSize,String record) {
		//用插件进行分页
        PageHelper.startPage(pageNum, 10);// 参数： 页数   条数
		return noticeDao.noticeLikeAll(record);//调用mapper无需多说
	}

也可以直接将 页数 、每页条数、总条数等数据封装进实体类中，方便调用。

可以的话请给小编一个赞哈！谢谢各位！