springBoot使用mybatis-plus插件实现分页过程

<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus</artifactId>
    <version>3.0-beta</version>
</dependency>

package com.dm.krystal.core.config;
import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * @author krystal
 */
@Configuration
/*@MapperScan("com.dm.krystal")*/ /*  KrystalApiApplication在启动文件上写了，这里不加*/
public class MyBatisPlusConfig {
    /**
     * mybatis-plus分页插件
     */
    @Bean
    public PaginationInterceptor paginationInterceptor() {
        PaginationInterceptor paginationInterceptor = new PaginationInterceptor();
        return paginationInterceptor;
    }
}

IPage<ExaminationPaperRelevancePO>  pageData = examinationPaperRelevanceService.getExaminationPaperPageByQueryVO(page,examinationPaperQueryVO);

IPage<ExaminationPaperRelevancePO> getExaminationPaperPageByQueryVO(Page page, ExaminationPaperQueryVO examinationPaperQueryVO);

@Override
public IPage<ExaminationPaperRelevancePO> getExaminationPaperPageByQueryVO(Page page, ExaminationPaperQueryVO examinationPaperQueryVO) {

    return this.baseMapper.getExaminationPaperPageByQueryVO(page,examinationPaperQueryVO);
}

IPage<ExaminationPaperRelevancePO> getExaminationPaperPageByQueryVO(Page page, @Param("examinationPaperQueryVO")ExaminationPaperQueryVO examinationPaperQueryVO);

 <select id="getExaminationPaperPageByQueryVO" resultType="com.eebbk.core.pojo.vo.ExaminationPaperCatalogVO">
        select
        a.id,a.paper_id,a.publisher_id,
        a.publisher_name,a.grade_id,a.grade_name,
        a.semester_id,a.semester_name,
        a.subject_id,a.section_id,a.source_type,
        a.province_id,a.province_name,a.city_id,
        a.city_name,a.`order`,a.staged_type as stageTypeId,a.school_type
        from t_examination_paper_relevance  a
    </select>

IPage<ExaminationPaperPO> pageData = PageUtil.listToPage(paperList,page.getCurrent(),page.getSize());

import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import lombok.extern.slf4j.Slf4j;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.LongAccumulator;

@Slf4j
public class PageUtil {


    public static <T> IPage<T> listToPage(List<T> list, long pageNum, long pageSize){
        IPage<T> iPage = new Page<>(pageNum,pageSize);
        iPage.setTotal(list.size());
        int startIndex = (int)((pageNum - 1) * pageSize);
        if(null == list || list.isEmpty() || startIndex > list.size()){
            iPage.setRecords(new ArrayList<>());
        }
        else {
            int toIndex = (int)(pageNum * pageSize);
            iPage.setRecords(list.subList(startIndex,toIndex > list.size() ? list.size() : toIndex));
        }
        return iPage;
    }
}