mybatis plus 分页的简单案例

可以参考以下代码：

//1.引入相关包和类
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.baomidou.mybatisplus.extension.service.IService;

//2.定义一个service接口
public interface UserService extends IService<User> {
    //分页查询用户信息
    public IPage<User> selectUserPage(Page<User> page, QueryWrapper<User> queryWrapper);
}

//3.实现service接口，具体实现分页查询
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements UserService {
    @Override
    public IPage<User> selectUserPage(Page<User> page, QueryWrapper<User> queryWrapper) {
        return baseMapper.selectPage(page, queryWrapper);
    }
}

//4.在controller中调用分页查询的方法
@Controller
@RequestMapping("/test")
public class UserController {
    @Autowired
    private UserService userService;

    @GetMapping("/users")
    public String users(Model model) {
        //当前页数和每页记录数
        Page<User> page = new Page<>(1, 10);
        //查询条件
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.gt("age", 20);//年龄大于20的记录
        //调用分页查询的方法
        IPage<User> userList = userService.selectUserPage(page, queryWrapper);
        //将查询结果返回到页面
        model.addAttribute("userList", userList.getRecords());
        model.addAttribute("total", userList.getTotal());
        model.addAttribute("current", userList.getCurrent());
        model.addAttribute("size", userList.getSize());
        return "user_list";
    }
}

//5.在html页面中展示分页数据
<table>
    <thead>
        <tr>
            <td>名称</td>
            <td>年龄</td>
            <td>性别</td>
        </tr>
    </thead>
    <tbody>
        <tr th:each="user : ${userList}">
            <td th:text="${user.name}"></td>
            <td th:text="${user.age}"></td>
            <td th:text="${user.gender}"></td>
        </tr>
    </tbody>
</table>
<nav>
  <ul class="pagination">
    <li class="page-item"><a class="page-link" th:href="@{'/test/users?page=' + ${current-1}}">Previous</a></li>
    <li class="page-item"><a class="page-link" th:href="@{'/test/users?page=' + 1}">1</a></li>
    <li class="page-item"><a class="page-link" th:href="@{'/test/users?page=' + 2}">2</a></li>
    <li class="page-item"><a class="page-link" th:href="@{'/test/users?page=' + 3}">3</a></li>
    <li class="page-item"><a class="page-link" th:href="@{'/test/users?page=' + ${current+1}}">Next</a></li>
  </ul>
</nav>

以上代码基于Mybatis-Plus和Spring Boot框架实现了一个简单的分页查询。在UserService中定义了selectUserPage方法，实现了分页查询的具体逻辑；而在UserController中调用了该方法，并将查询结果返回给页面，同时在html页面中展示了分页数据。