使用Mybatis实现分页效果示例

/**
 * @param <T> 泛型类
 */
public class PageUtil<T> {
    //当前页码
    private int pageIndex;
    //每页记录数
    private int pageSize;
    //总记录数
    private int count;
    //总页数
    private int pageNum;
    //每一页的内容
    private List<T> list;
}

<!--分页，查询当前页的内容-->
    <select id="getBooksPage" resultType="list" parameterType="map">
        select * from books limit #{pageIndex},#{pageSize}
    </select>
<!--查询总记录数-->
    <select id="getCount" resultType="int" parameterType="map">
        select count(*) from books
</select>

public PageUtil<Books> getBooksPage(int pageIndex, int pageSize) {
        PageUtil<Books> pageUtil=new PageUtil<>();
        SqlSession sqlSession= MybatisUtil.getSqlSession();
        try {
            //booksMapper是使用动态代理模式，运行反射机制，创建的一个代理对象
            BooksMapper booksMapper=sqlSession.getMapper(BooksMapper.class);
            Map map=new HashMap();
            int row=booksMapper.getCount(map);
            //计算总页数
            int pageCount= (int) Math.ceil((double) row / pageSize);
            //limit的第一个参数=（当前页码-1）*每页记录数
            map.put("pageIndex",(pageIndex - 1) * pageSize);
            map.put("pageSize", pageSize);
            List<Books> list=booksMapper.getBooksPage(map);
            //将数据封装
            pageUtil.setPageIndex(pageIndex);
            pageUtil.setPageSize(pageSize);
            pageUtil.setCount(row);
            pageUtil.setPageNum(pageCount);
            pageUtil.setList(list);
        }catch (Exception e){
            e.printStackTrace();
        }finally {
            sqlSession.close();
        }
        return pageUtil;
    }

protected void getBooks(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        if(request.getParameter("pageIndex")!=null) {
            int pageIndex=Integer.parseInt(request.getParameter("pageIndex"));
            show(response,pageIndex,search);
        }else {
            show(response);
        }
 
    }

private void show(HttpServletResponse response,Object ...ages) throws IOException {
        int pageIndex = 1;//默认第一页
        if(ages.length>0){
            pageIndex=(int)ages[0];
        }
        PageUtil pageUtil=new PageUtil();
        //每页10条数据
        pageUtil=new BooksServiceImpl().getBooksPage(pageIndex,10);
        String js= JSON.toJSONString(pageUtil);
        PrintWriter pw=response.getWriter();
        pw.write(js);
    }

var page = "<li>共" + data.count + "条，共" + data.pageNum + "页，当前第" + data.pageIndex + "页</li>";
            page += "<li><a href='#' onclick='myPage(1)'>首页</a></li>";
 
            if (data.pageIndex == 1) {
                page += "<li><a href='#' onclick='myPage(1)'>上一页</a></li>";
            } else {
                page += "<li><a  href='#'  onclick='myPage(" + (data.pageIndex - 1) + ")'>上一页</a></li>";
            }
            // for (var i = 1; i <= data.pageNum; i++) {
            //     page += "<a href='#' onclick='myPage(" + i + ")'>" + i + "</a>"
            // }
            if (data.pageIndex < data.pageNum) {
                page += "<li><a href='#' onclick='myPage(" + (data.pageIndex + 1) + ")'>下一页</a></li>";
            } else {
                page += "<li><a href='#' onclick='myPage(" + data.pageNum + ")'>下一页</a></li>";
            }
            page += "<li><a href='#' onclick='myPage(" + data.pageNum + ")'>末页</a></li>";

function myPage(index) {
            console.log(index)
            $.getJSON("books/getBooks.do", {"pageIndex": index}, function (data) {
                showBooks(data)
            });
}

public class MybatisUtil {
    static SqlSessionFactory sqlSessionFactory;
 
    // 加载主配置文件，并创建 sqlSessionFactory
    static {
        String resource = "com/xmx/config/mybatis-config.xml";
        InputStream inputStream = null;
        try {
            inputStream = Resources.getResourceAsStream(resource);
        } catch (IOException e) {
            e.printStackTrace();
        }
        sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
    }
 
    /**
     * @Description: 向外提供一个方法，可以获取SqlSession对象
     * @Return: org.apache.ibatis.session.SqlSession
     */
    public static SqlSession getSqlSession() {
//        return sqlSessionFactory.openSession(true);
        return sqlSessionFactory.openSession();
    }
}