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第二十三节 使用github.pagehelper实现分页

亮子 2023-11-10 10:57:03 6550 0 0 0

1、添加依赖

        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper</artifactId>
            <version>5.1.10</version>
        </dependency>

2、定义mapper文件xml

    <select id="getListByPage" resultType="com.bw.pojo.TbRole">
        select * from tb_role
        order by role_id
    </select>

3、定义mapper接口类

public interface TbRoleMapper {
    List<TbRole> getListByPage();
}

4、实现类

    @Override
    public PageInfo getListByPage(Integer pageNum, Integer pageSize) {
        //--1 开启分页
        PageHelper.startPage(pageNum, pageSize);

        //--2 执行分页查询
        List<TbRole> listByPage = tbRoleMapper.getListByPage();

        //--3 返回分页数据
        return new PageInfo(listByPage);
    }

5、控制层

  • 方式一：在控制层实现
    @GetMapping(value = "/bill")
    public String bill(Model model, Integer pageNum, Integer pageSize) {
        if(pageNum==null || pageNum==0) {
            pageNum = 1;
        }
        if(pageSize==null || pageSize==0) {
            pageSize = 10;
        }

        PageInfo pageInfo = tbBillService.getBillByPage(pageNum, pageSize);

        List list = pageInfo.getList();

        model.addAttribute("list", list);
        model.addAttribute("pages", pageInfo.getPages());
        model.addAttribute("curPage", pageNum);
        model.addAttribute("pageSize", pageInfo.getPageSize());
        model.addAttribute("prePage", pageInfo.getPrePage());
        model.addAttribute("nextPage", pageInfo.getNextPage());
        model.addAttribute("navigatePageNums", pageInfo.getNavigatepageNums());

        return "bill";
    }
  • 方式二：在jsp层实现

1）、控制层代码

    @GetMapping(value = "/page")
    public String page(Model model, @RequestParam(value = "pageNum", defaultValue = "1") Integer pageNum,
                       @RequestParam(value = "pageSize", defaultValue = "3") Integer pageSize) {

        if(pageNum == 0) {
            pageNum = 1;
        }

        PageInfo listByPage = tbRoleService.getListByPage(pageNum, pageSize);

        model.addAttribute("listByPage", listByPage);

        return "roleList";
    }

2）、jsp代码

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<%--
  Created by IntelliJ IDEA.
  User: andy
  Date: 2023/11/11
  Time: 9:56
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>角色管理</title>
</head>
<body>

<div>
    <h3>角色管理</h3>
</div>

<div>
    <table>
        <tr>
            <th>角色ID</th>
            <th>角色名称</th>
            <th>创建时间</th>
        </tr>

        <c:forEach items="${listByPage.list}" var="item">
            <tr>
                <td>${item.roleId}</td>
                <td>${item.roleName}</td>
                <td>
                    <fmt:formatDate value="${item.createTime}" pattern="yyyy-MM-dd HH:mm:ss"></fmt:formatDate>
                </td>
            </tr>
        </c:forEach>


    </table>
</div>
<div>
    <c:if test="${!listByPage.isFirstPage}">
        <a href="/zg2/role/page.do?pageNum=${listByPage.prePage}">上一页</a>&nbsp;
    </c:if>

    <c:forEach items="${listByPage.navigatepageNums}" var="item">
        <a href="/zg2/role/page.do?pageNum=${item}">${item}</a>&nbsp;
    </c:forEach>

    <c:if test="${!listByPage.isLastPage}">
        <a href="/zg2/role/page.do?pageNum=${listByPage.nextPage}">下一页</a>
    </c:if>

</div>


</body>
</html>