[大数据]Java MangoDB API 的聚合Aggregation-分页查询代码

    /**
     * 管道查询分页
     *
     * @param criteria    条件
     * @param entityClass mongo表实体类
     * @param pageSize    每页大小
     * @param pageNum     当前页
     * @param targetClass 想要转化的类
     * @param sort        排序
     * @param <T>         the type of the input to the function
     * @param <R>         the type of the result of the function
     * @return
     */
    public <T, R> PageResult<R> aggPageQuery(Criteria criteria, Class entityClass, Integer pageSize, Integer pageNum,
                                             Class targetClass, Sort sort) {

        Query query = new Query(criteria);
        long total = mongoTemplate.count(query, entityClass);
        final Integer pages = (int) Math.ceil(total / (double) pageSize);

        if (pageNum <= 0 || pageNum > pages) {
            pageNum = FIRST_PAGE_NUM;
        }

        MatchOperation match = Aggregation.match(criteria);
        Aggregation agg = Aggregation.newAggregation(
                match,
                Aggregation.sort(sort),
                Aggregation.skip(pageNum > 1 ? (pageNum - 1) * pageSize : 0),
                Aggregation.limit(pageSize)
        );

        List<T> mappedResultList = mongoTemplate.aggregate(agg, entityClass, targetClass).getMappedResults();
        log.info("mappedResultList :{}", mappedResultList);

        final PageResult pageResult = new PageResult<>();
        pageResult.setTotal(total);
        pageResult.setPages(pages);
        pageResult.setPageSize(pageSize);
        pageResult.setPageNum(pageNum);
        pageResult.setList(mappedResultList);
        return pageResult;
    }

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参考

java操作MangoDB的聚合Aggregation用法-分页查询
https://blog.csdn.net/weixin_37828719/article/details/102765150

java-mongo复杂管道聚合aggregate的填坑之路（分页、allowDiskUse、统计）
https://blog.csdn.net/u014773389/article/details/80938335?spm=1001.2101.3001.6650.1&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7Edefault-1.no_search_link&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7ECTRLIST%7Edefault-1.no_search_link

JAVA如何实现MongoDB动态条件的分页查询
https://www.yisu.com/zixun/234807.html