动态金额 jsonArray 计算

数据格式 [{"name": "福利卡券", "type": "WELFARE_CARD_COUPON", "useNum": 0.01}, {"name": "现金", "type": "CASH", "useNum": 12.26}]

相加

/**
 * costinfo 运算相加
 *
 * @param totalCostInfo
 * @param costInfo
 * @return
 */
private List<CostInfo> addCostInfo(List<CostInfo> totalCostInfo, List<CostInfo> costInfo) {

    if (CollectionUtils.isEmpty(costInfo)) {
        return totalCostInfo;
    }

    Map<String, CostInfo> costInfoTOMap = totalCostInfo
            .stream()
            .collect(Collectors.toMap(e -> e.getType(), t -> t));

    Map<String, CostInfo> costInfoMap = costInfo
            .stream()
            .collect(Collectors.toMap(e -> e.getType(), t -> t));

    Map<String, CostInfo> newMap = new HashMap<>();
    for (Map.Entry<String, CostInfo> entry : costInfoTOMap.entrySet()) {
        String key = entry.getKey();
        CostInfo existCostInfo = costInfoMap.get(key);
        // 存在
        CostInfo newCostInfo = new CostInfo();
        CostInfo value = entry.getValue();
        if (null != existCostInfo) {
            newCostInfo.setName(value.getName());
            newCostInfo.setType(key);
            newCostInfo.setUseNum(NumberUtil.add(value.getUseNum(), existCostInfo.getUseNum()));
        } else {
            newCostInfo.setName(value.getName());
            newCostInfo.setType(key);
            newCostInfo.setUseNum(value.getUseNum());
        }
        newMap.put(key, newCostInfo);
    }

    for (Map.Entry<String, CostInfo> entry : costInfoMap.entrySet()) {
        String key = entry.getKey();
        CostInfo value = entry.getValue();
        CostInfo info = newMap.get(key);
        if (null == info) {
            CostInfo newCostInfo = new CostInfo();
            newCostInfo.setName(value.getName());
            newCostInfo.setType(key);
            newCostInfo.setUseNum(value.getUseNum());
            newMap.put(key, newCostInfo);
        }
    }

    List<CostInfo> costInfoTOList = new ArrayList<>();
    // 保证顺序
    totalCostInfo.forEach(e -> {
        CostInfo info = newMap.get(e.getType());
        if (null == info) {
            costInfoTOList.add(e);
        } else {
            costInfoTOList.add(info);
        }
    });
    Map<String, CostInfo> costInfoTOListMap = costInfoTOList
            .stream()
            .collect(Collectors.toMap(e -> e.getType(), t -> t));
    newMap.forEach((key, value) -> {
        CostInfo info = costInfoTOListMap.get(key);
        // 补全之前 没有加入的
        if (null == info) {
            costInfoTOList.add(value);
        }
    });
    return costInfoTOList;
}

相减

 /**
     * costinfo 运算相减
     *
     * @param totalCostInfo 总的
     * @param costInfo      被减数
     * @return
     */
    private List<CostInfo> subCostInfo(List<CostInfo> totalCostInfo, List<CostInfo> costInfo) {

        if (CollectionUtils.isEmpty(totalCostInfo) || CollectionUtils.isEmpty(costInfo)) {
            return totalCostInfo;
        }

        Map<String, CostInfo> costInfoTOMap = totalCostInfo
                .stream()
                .collect(Collectors.toMap(e -> e.getType(), t -> t));

        Map<String, CostInfo> costInfoMap = costInfo
                .stream()
                .collect(Collectors.toMap(e -> e.getType(), t -> t));

        Map<String, CostInfo> newMap = new HashMap<>();
        for (Map.Entry<String, CostInfo> entry : costInfoTOMap.entrySet()) {
            String key = entry.getKey();
            CostInfo existCostInfo = costInfoMap.get(key);
            // 存在
            if (null != existCostInfo) {
                CostInfo value = entry.getValue();
                CostInfo newCostInfo = new CostInfo();
                newCostInfo.setName(value.getName());
                newCostInfo.setType(key);
                newCostInfo.setUseNum(NumberUtil.sub(value.getUseNum(), existCostInfo.getUseNum()));
                newMap.put(key, newCostInfo);
            }
        }
        List<CostInfo> costInfoTOList = new ArrayList<>();
        // 保证顺序
        totalCostInfo.forEach(e -> {
            CostInfo info = newMap.get(e.getType());
            if (null == info) {
                costInfoTOList.add(e);
            } else {
                costInfoTOList.add(info);
            }

        });
        return costInfoTOList;
    }

总结 ： 一giao 我滴 giao ，这种格式的数据计算 有点小麻烦