Java案例树形数据结构及构建

@Data
@AllArgsConstructor
@NoArgsConstructor
public class SysDataDictTreeResp extends SysDataDict {

    @ApiModelProperty(value = "子集")
    List<SysDataDictTreeResp> childrenList;

}

//构建树

private List<SysDataDictTreeResp> generateDictTree(Map<String, List<SysDataDict>> dataGroupMap,
                                                       List<SysDataDict> defaultGroupSonKeys) {
        return defaultGroupSonKeys.stream().map(data -> {
            SysDataDictTreeResp resp = new SysDataDictTreeResp();
            BeanUtils.copyProperties(data, resp);
            resp.setChildrenList(generateChildrenDict(dataGroupMap, data.getDataKey()));
            return resp;
        }).collect(Collectors.toList());
    }

    private List<SysDataDictTreeResp> generateChildrenDict(Map<String, List<SysDataDict>> dataGroupMap, String dataKey) {
        if (dataGroupMap.containsKey(dataKey)) {
            List<SysDataDict> mapValues = dataGroupMap.get(dataKey);
            return generateDictTree(dataGroupMap, mapValues);
        }
        return Collections.emptyList();
    }