数据结构示例如下
字段 类型
id int
pid int
name varchar
代码实现
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/**
 * @Author: M_YF
 * @Date: 2019/10/17 11:09
 * @Description: 符合tree树数据结构类
 */
@Data
@JsonInclude(JsonInclude.Include.NON_NULL)
public class TreeIViewData implements Serializable {

    private String id;
    private String pid;
    List<TreeIViewData> children;
    private String title;  //标题
    private boolean expand;
    private Object obj;
  <!--.... 省略代码-->
  }

 /**  通过pid获得子级*/
 private List<TreeIViewData> getTreeParentDatas(List<Map<String, Object>> arrayList,String paramPid) {
        List<TreeIViewData> iViewDataList=new LinkedList<>();
        for(Map<String, Object> maps:arrayList){
            String id=maps.get("id")+"";
            String pid=maps.get("pid")+"";
            String title=maps.get("name")+"";
            if(StringUtils.equals(pid,paramPid)){
                iViewDataList.add(new TreeIViewData(id,pid,title,false));
            }
        }
        return iViewDataList;
    }

 /** 递归获得子级集合*/
 private void findChildrens(List<Map<String, Object>> arrayList,List<TreeIViewData> treeIViewDataList) {
        for(TreeIViewData treeIViewData:treeIViewDataList){
            List<TreeIViewData> chridrenList=this.getAttentionAtlasTree(arrayList,treeIViewData.getId());
            if(chridrenList!=null&&chridrenList.size()>0)
                findChildrens(arrayList,chridrenList);
            treeIViewData.setChildren(chridrenList);
        }
    }

/**  调用*/
public static void main(String[] args) {
       <!--省略代码-->
       List<Map<String, Object>> arrayList= atlasService.queryForList(sql); //取得数据源
           List<TreeIViewData> treeIViewDataList=getAttentionAtlasTree(arrayList,"0");
            findChildrens(arrayList,treeIViewDataList);
            System.out.print(JSONObject.toJSONString(treeIViewDataList));
}