JAVA中List集合里的对象,并根据对象中的某个字段属性进行去重

    /**
     * 获取合同选择下拉框数据
     *
     * @param purchaseContractGoods
     * @return
     */
    public List<Map<String, Object>> findGoodsNoSelectInit(PurchaseContractGoods purchaseContractGoods) {
        //获取根据对象查询到的所有数据
        List<PurchaseContractGoods> list = this.findList(purchaseContractGoods);
        //用于存储select2下拉框的map集合
        List<Map<String, Object>> mapList = ListUtils.newArrayList();

        //根据list对象中的某个字段进行去重处理
        List<PurchaseContractGoods> distinctList = list.stream().collect(Collectors.collectingAndThen(
                Collectors.toCollection(() -> new TreeSet<>(Comparator.comparing(PurchaseContractGoods::getGoodsNo))), ArrayList::new));
        //去重后的数据循环放入下拉框数据中
        distinctList.forEach(item -> {
            Map<String, Object> map = MapUtils.newHashMap();
            map.put("id", item.getGoodsNo());
            map.put("text", item.getGoodsNo());
            map.put("name", item.getGoodsName());
            mapList.add(map);
        });
        return mapList;
    }