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java中List分页的几种方法介绍

作者:chatty 陈

大家好,本篇文章主要讲的是java中List分页的几种方法介绍,感兴趣的同学赶快来看一看吧,对你有帮助的话记得收藏一下,方便下次浏览

1.根据入参带分页参数进行sql查询分页

         Criteria criteria = new Criteria();
         //将dataAuto转成 factoryId brandId seriesId 等查询条件
         String dataAuth = "";
         TypeCaseHelper.dataAuto(criteria, dataAuth);
         // 设置分页信息
         ExtPager pager = new ExtPager();
         Integer startTure = start * pageSize;
         criteria.setMysqlPageSize(pageSize);
         criteria.setMysqlStart(startTure);
         // 排序信息
         if (StringUtils.isNotBlank(pager.getDir()) && StringUtils.isNotBlank(pager.getSort())) {
             criteria.setOrderByClause(pager.getSort() + " " + pager.getDir());
         }
         List<VhlAlarmStatusMgtEntity> listDistinct = getVhlAlarmStatusMgtEntities(vin, faultStatus, confirmStatus, startDateTime, endDateTime, sdf, sdfm, carTypeList, criteria);

对应的分页sql

  <select id="selectByExample" parameterType="Criteria" resultMap="BaseResultMap">
    select
    <include refid="Base_Column_List" />
    from status_mgt
    <where>
      <if test="condition.carTypeList != null and condition.carTypeList.size() > 0" >
        and car_type in
        <foreach collection="condition.carTypeList" item="item"  open="(" separator="," close=")">
          #{item}
        </foreach>
      </if>
      <if test="condition.startDateTime != null and condition.startDateTime!=''">
        and alarm_time >= str_to_date(#{condition.startDateTime,jdbcType=VARCHAR},'%Y-%m-%d %H:%i:%S')
      </if>
      <if test="condition.endDateTime != null and condition.endDateTime!=''">
        and  str_to_date(#{condition.endDateTime,jdbcType=VARCHAR},'%Y-%m-%d %H:%i:%S') >= alarm_time
      </if>
      and logic_flag = 1
    </where>
    order by alarm_time desc
    <if test="mysqlStart != null  and mysqlPageSize != null">
        limit #{mysqlStart}, #{mysqlPageSize}
    </if>
 
  </select>

2.对所有list根据分页参数分页

         Criteria criteria1 = new Criteria();
         List<VhlAlarmStatusMgtEntity> listDistinctForCout = getVhlAlarmStatusMgtEntities(vin, faultStatus, confirmStatus, startDateTime, endDateTime, sdf, sdfm, carTypeList, criteria1);
         Integer count = listDistinctForCout.size(); // 记录总数
         Integer pageCount; // 页数
         if (count % pageSize == 0) {
             pageCount = count / pageSize;
         } else {
             pageCount = count / pageSize + 1;
         }
         int fromIndex; // 开始索引
         int toIndex; // 结束索引
         if (!pageCount.equals(start+1)) {
             fromIndex = start * pageSize;
             toIndex = fromIndex + pageSize;
             if(toIndex > count){
                 fromIndex = (start-1) * pageSize;
                 toIndex = count;
             }
         } else {
             fromIndex = start * pageSize;
             toIndex = count;
         }
         List<VhlAlarmStatusMgtEntity> pageList = listDistinctForCout.subList(fromIndex, toIndex);

3.PageHelper分页

      //开启分页
        PageHelper.startPage(Integer.parseInt(pageNum), Integer.parseInt(pageSize));
 
        PageInfo<Map<String, String>> pageInfo = new PageInfo(datalist);
 
        HashMap<String, Object> map= new HashMap<>();
        map.put("datalist", datalist);
        map.put("total", pageInfo.getTotal());
        map.put("size", pageInfo.getPageSize());
        map.put("page", pageInfo.getPageNum());

到此这篇关于java中List分页的几种方法介绍的文章就介绍到这了,更多相关java List分页方法内容请搜索脚本之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持脚本之家!

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