PageHelper

//对页码和条数进行校验
if(pageNum == null){
    pageNum = 1;
}
if (pageSize == null){
    pageSize = 10;
}
if(pageNum>0&&pageSize>0){
//启用PageHelper
    PageHelper.startPage(pageNum,pageSize);
}
List<ShipTo> list = shipToMapper.selectInfo();
//将list转成PageInfo
PageInfo<ShipTo> pageInfo = new PageInfo<>(list);
return pageInfo;