开门第一篇（java8流式处理）

//根据LeWarehouseCode字段进行分组
//        Map<String, List<SodRecExt2>> map = list.stream().collect(
//           Collectors.groupingBy(
//                      SodRecExt2::getLeWarehouseCode
//           ));

//        Map<String, Map<String, List<SodRecExt2>>> prodMap= list.stream().collect(Collectors.groupingBy(SodRecExt2::
//                                                   getLeWarehouseCode, Collectors.groupingBy(item -> {
//            if(!item.getLeWarehouseCode().equals(CommonEnum.WdtErpWarehouse.YC030C.getCode()) && item.getIfSubOrder()
//                    .equals("1")) {
//                return "splitPreSale";
//            }else {
//                return "noSplitPreSale";
//            }
//        })));


Map<String, Map<String, Map<String, List<SodRecExt2>>>> prodMap= list.stream().collect(Collectors.groupingBy(SodRecExt2::
        getLeWarehouseCode, Collectors.groupingBy(itemWarehouse -> {
    if(!itemWarehouse.getLeWarehouseCode().equals(CommonEnum.WdtErpWarehouse.YC030C.getCode()) && itemWarehouse.getIfSubOrder()
            .equals("1")) {
        return "splitPreSale";
    }else {
        return "noSplitPreSale";
    }
},Collectors.groupingBy(itemRz285345 -> {
    if(!itemRz285345.getLeWarehouseCode().equals(CommonEnum.WdtErpWarehouse.RZ285345.getCode()) && itemRz285345.getLeDecideLogistics()
            .equals("1")) {
        return "decideLogistics1";
    } else {
        return "decideLogistics0";
    }
}))));

//    private static String fetchGroupKey(SodRecExt2 sodRecExt2){
//        String fetchGroupKey="";
//        if (sodRecExt2.getLeWarehouseCode().equals(CommonEnum.WdtErpWarehouse.RZ285345.getCode())){
//            fetchGroupKey = sodRecExt2.getLeWarehouseCode()+'-'+sodRecExt2.getIfSubOrder();
//        } else {
//
//        }
//        return sodRecExt2.getLeWarehouseCode()+'-'+sodRecExt2.getIfSubOrder();
//    }

//从list集合中，取出按sku设置库存的集合
Map<String, List<BuyGiftGradeLe>> buyGiftMap= buyGiftGradeLes.stream().collect(Collectors.groupingBy(
        buyGiftGradeLe -> {
    if(buyGiftGradeLe.getBuyLeId() !=null) {
        return "giftBySku";
    }else {
        return "other";
    }
}));

LinkedHashMap<Long, BigDecimal> linkedMap = new LinkedHashMap<>();
//将HashMap转换成LinkedHashMap
map.entrySet().stream().sorted(Map.Entry.comparingByValue(Comparator.reverseOrder()))
        .forEachOrdered(entry -> linkedMap.put(entry.getKey(), entry.getValue()));
List<BigDecimal> collect = linkedMap.values().stream().collect(Collectors.toList());