关于springboot:Spring-Boot分页

第一步：定义方法

@PostMapping("list")    public Object list(@RequestBody PageParam pageParam) {        //以后页码        int current = (int)pageParam.getPageNum();        //每页条数        int size = (int)pageParam.getPageSize();        //构建 分页结构器        IPage<User> page = new Page(current, size);        //构建 条件结构器        QueryWrapper<User> wrapper = new QueryWrapper<>();        userMapper.selectPage(page, wrapper);        List<User> records = page.getRecords();//当前页数据        long total = page.getTotal();//总条数        long pages = page.getPages();//总页数        records.forEach(System.out::println);        System.out.println("以后数据总共有:"+total);        System.out.println("共"+pages+"页");        System.out.println("当前页数据:"+records);        return Result.suc(records, total);    }

第二步：定义UserMapper.java

package com.example.demo12.mapper;import com.baomidou.mybatisplus.core.mapper.BaseMapper;import com.example.demo12.entity.User;import org.apache.ibatis.annotations.Mapper;import java.util.List;@Mapperpublic interface UserMapper extends BaseMapper<User> {    List<User> listAll();}

第三步：UserMapper.xml

<?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.example.demo12.mapper.UserMapper">    <select id = "listAll" resultType="com.example.demo12.entity.User">        select * from user    </select>    <select id = "userCount" resultType="java.lang.Integer">        select count(1) from user    </select>    <select id = "listTest" resultType="com.example.demo12.entity.User">        select * from user    </select>    <select id = "testUserCount" resultType="java.lang.Integer">        select count(1) from user    </select></mapper>