先看《分页》再看这个 分页page错误示范

错误示范

controller层

查询条件放在了java中

    /**
     * @param userId   用户id
     * @param pageSize 每条页数
     * @param pageNum  第几页
     * @return
     */
    @ApiOperation("查询点分页列表")
    @PostMapping("/pageList")
    @ResponseBody
    public Response pageList(Integer userId, Integer pageSize, Integer pageNum) {
        QueryWrapper<Point> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq("user_id", userId);
        PageHelper.startPage(pageNum, pageSize);
        List<Point> list = pointMapper.selectListBYList(userId);
        PageInfo<Point> page = new PageInfo<>(list);
        return new Response(ResponseEnum.SUCCESS, page);
    }

正确示范

controller层

    /**
     * @param userId   用户id
     * @param pageSize 每条页数
     * @param pageNum  第几页
     * @return
     */
    @ApiOperation("查询点分页列表")
    @PostMapping("/pageList")
    @ResponseBody
    public Response pageList(Integer userId, Integer pageSize, Integer pageNum) {
        PageHelper.startPage(pageNum, pageSize);
        List<Point> list = pointMapper.selectListBYList(userId);
        PageInfo<Point> page = new PageInfo<>(list);
        return new Response(ResponseEnum.SUCCESS, page);
    }

mapper.xml层

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.chengdu.water.mapper.PointMapper">

    <select id="selectListBYList" resultType="com.chengdu.water.entity.Point">
        select * from point where user_id = #{userId}
    </select>
</mapper>