class DictItem{
private String dataType;
private String dataCode;
private String dataValue;
}
如何将List<\DictItem>转化为Map<\String,List<\Map<\String,DictItem>>>
按照datatype,datacode 分组
这种方式得到的是Map<\String, Map<\String, List<\DictItem>>>
dictMaps = dictItems.stream().collect(Collectors.groupingBy(DictItem::getDataType, Collectors.groupingBy(DictItem::getDataCode)));