java使用mongodb分页查询案例

@Override
public Response chipListByPage(ChipPageListParam request) {

//查询条件

Query query = new Query();
Criteria criteria = new Criteria();

if (StringUtils.isNotBlank(request.getTitleLike())) {
    Pattern pattern = Pattern.compile("^.*" + request.getTitleLike() + ".*$", Pattern.CASE_INSENSITIVE);
    criteria = criteria.and("chipName").regex(pattern);
}
if (StringUtils.isNotBlank(request.getPartnersId())) {
    criteria = criteria.and("partnersId").is(request.getPartnersId());
}

Integer pageNum = request.getPageNum();
if (pageNum == null || pageNum <= 0) {
    pageNum = 1;
}
Integer pageSize = request.getPageSize();
if (pageSize == null || pageSize <= 0) {
    pageSize = 10;
}

//mongodb分页查询核心代码

Query countQuery = new Query(criteria);

long totalCount = mongoTemplate.count(countQuery, RedChip.class);
query = query.limit(pageSize).skip((pageNum - 1) * pageSize);
query = query.addCriteria(criteria);
query = query.with(Sort.by(Sort.Order.desc("createTime")));
List<RedChip> redChips = mongoTemplate.find(query, RedChip.class);

// 转换vo
List<ChipListVO> chipListVOS = JSON.parseArray(JSON.toJSONString(redChips), ChipListVO.class);
for (ChipListVO item: chipListVOS
     ) {
    if(StringUtils.isBlank(item.getBatchCode())|| Objects.isNull(item.getSuitPlatformId())|| Objects.isNull(item.getActiveRelatedStatus()))
        continue;
    if(item.getSuitPlatformId().equals(RedChipDetailSuitEnum.LiZan.getValue()) && 1 == item.getActiveRelatedStatus()){
        item.setPacketTitle("("+item.getBatchCode()+")");
    }
}
Page<ChipListVO> page = new Page<>();
page.setRows(chipListVOS);
page.setTotalCount(totalCount);
BigDecimal totalPage = new BigDecimal(totalCount);
totalPage = totalPage.divide(new BigDecimal(request.getPageSize()), RoundingMode.CEILING);
page.setTotalPage(totalPage.longValue());
page.setPageNum(pageNum);
page.setPageSize(pageSize);
return Response.success(page);
}


//分页类

@ApiModel(value = "分页参数")
@Data
public class BasePageParam implements Serializable {
    /**
     * 当前页页码
     */
    @ApiModelProperty(value = "当前页页码")
    @NotNull(message = "缺少分页参数: pageNum")
    @Min(value = 1)
    private Integer pageNum;
    /**
     * 每页记录数
     */
    @ApiModelProperty(value = "每页记录数")
    @NotNull(message = "缺少分页参数: pageSize")
    @Min(value = 1)
    private Integer pageSize;
}

/**
 * 分页类
 */
@Getter
@Setter
public class Page<T> extends BasePageParam {
    //总页数
    private long totalPage;

    //总记录数
    private long totalCount;

    //每页显示集合
    private List<T> rows;
}