通过stream的toMap的功能

  LambdaQueryWrapper<SpotCheck> queryWrapper = new LambdaQueryWrapper<>();
            queryWrapper.in(SpotCheck::getCheckCode,checkCodes);
            List<SpotCheck> spotChecks = spotCheckMapper.selectList(queryWrapper);
            if (CollUtil.isNotEmpty(spotChecks)){
                Map<String, SpotCheck> spotCheckMap = spotChecks.stream().collect(Collectors.toMap(SpotCheck::getCheckCode, SpotCheck -> SpotCheck));
                exportList = exportList.stream().peek(e->{
                    SpotCheck spotCheck = spotCheckMap.get(e.getCheckCode());
                    if (ObjUtil.isNotEmpty(spotCheck)){
                        BeanUtil.copyProperties(spotCheck,e);
                    }
                }).collect(Collectors.toList());
            }

通过先查询出所有对象，通过java8的stream中tomap方法，把集合对象变为map的key和value对象，key是用唯一的字段，比如id或者code等

下面的集合可以使用stream的peek的遍历，将其map进行匹配，记住需要返回判空