项目经理的特殊需求，对象的移动，

/**
     * @param mustChange 需要移动的元素下表
     * @param beChange   需要移动到的下表
     * @return
     */
    @Override
    public ResponseEntity<JsonResultEntity> sortBanner(Integer mustChange, Integer beChange) {
        beChange = beChange - 1;
        mustChange = mustChange - 1;
        Example example = new Example(BannersEntity.class);
        Example.Criteria criteria = example.createCriteria();
        criteria.andNotEqualTo("status", BannersEntity.StatusEnum.DEL.getCode());
        example.setOrderByClause("sort_id ASC");
        List<BannersEntity> bannersEntities = bannersMapper.selectByExample(example);
        if (bannersEntities == null || mustChange.equals(beChange)) {
            return ResponseEntity.ok(JsonResultUtil.success());
        }
        if (mustChange.compareTo(bannersEntities.size()) > 0 || mustChange.compareTo(0) < 0) {
            return ResponseEntity.ok(JsonResultUtil.success("需要移动的元素下标越界！"));
        }
        if (beChange.compareTo(bannersEntities.size()) > 0 || beChange.compareTo(0) < 0) {
            return ResponseEntity.ok(JsonResultUtil.success("需要移动的元素下标越界！"));
        }
        if (mustChange < beChange) {
            //当需要移动的下标大于被移动到的位置的下标的时候，则区间整体下移
            for (int i = mustChange; i < beChange + 1; i++) {
                if (i == mustChange) {
                    bannersEntities.get(mustChange).setSortId(bannersEntities.get(beChange).getSortId());
                    bannersMapper.updateByPrimaryKeySelective(bannersEntities.get(mustChange));
                } else {
                    bannersEntities.get(i).setSortId(bannersEntities.get(i).getSortId() - 1);
                    bannersMapper.updateByPrimaryKeySelective(bannersEntities.get(i));
                }
            }
        } else {
            bannersEntities.get(mustChange).setSortId(bannersEntities.get(beChange).getSortId());
            bannersMapper.updateByPrimaryKeySelective(bannersEntities.get(mustChange));
            //当需要移动的下标小于被移动到的位置的下标的时候，则区间整体上移
            for (int i = beChange; i < mustChange; i++) {
                bannersEntities.get(i).setSortId(bannersEntities.get(i).getSortId() + 1);
                bannersMapper.updateByPrimaryKeySelective(bannersEntities.get(i));
            }
        }
        getSortBanner();
        return ResponseEntity.ok(JsonResultUtil.success());
    }

   

    public void getSortBanner() {
        Example example = new Example(BannersEntity.class);
        Example.Criteria criteria = example.createCriteria();
        criteria.andNotEqualTo("status", BannersEntity.StatusEnum.DEL.getCode());
        example.setOrderByClause("sort_id ASC");
        List<BannersEntity> bannersEntities = bannersMapper.selectByExample(example);
        int min = bannersEntities.stream().mapToInt(BannersEntity::getSortId).summaryStatistics().getMin();
        int max = bannersEntities.stream().mapToInt(BannersEntity::getSortId).summaryStatistics().getMax();
        //如果有一个的sortId不为0则代表后面没有sortId为0的了
        if (bannersEntities != null && bannersEntities.size() > 0) {
            if (min != 0 && max == bannersEntities.size()) {
                return;
            } else if ((min != 0 && min != 1) || (min != 0 && max != bannersEntities.size())) {
                for (int i = 0; i < bannersEntities.size(); i++) {
                    bannersEntities.get(i).setSortId(i + 1);
                    bannersMapper.updateByPrimaryKeySelective(bannersEntities.get(i));
                }
            } else if (min == 0) {
                int index = 1;
                for (int i = 0; i < bannersEntities.size(); i++) {
                    if (bannersEntities.get(i).getSortId() == 0) {
                        bannersEntities.get(i).setSortId(bannersEntities.get(bannersEntities.size() - 1).getSortId() + index);
                        index++;
                        bannersMapper.updateByPrimaryKeySelective(bannersEntities.get(i));
                    }
                }
                getSortBanner();
            }
        }
    }