目录树-java，在springboot环境下的制作，实体类包含孩子集合

实体类ICBmEvaluation：

public class ICBmEvaluation extends BaseEntity {
    
    @NotBlank(message = "政策指标标题ID不能为空")
    private String titleId;
    
    @NotBlank(message = "政策指标标题名称不能为空")
    private String titleName;
    
    @NotBlank(message = "父id不能为空")
    private String parentId;
    
    private List childList;
}

包含 ：父id与孩子集合

service层：

    @Override
    public List selectBmEvaluationTree() throws Exception {
        //一级标题
        getUser();
        logger.info("开始查询树形");
        List data = icBmEvaluationMapper.queryBmEvaluation();
        List oneList = new ArrayList<>();
        //获得一级标题
        for (ICBmEvaluation icBmEvaluation : data){
            if (icBmEvaluation.getParentId().equals("0")){
                oneList.add(icBmEvaluation);
            }
        }
        //设置子菜单
        for (ICBmEvaluation icBmEvaluation : oneList){
            icBmEvaluation.setChildList(getChild(icBmEvaluation.getTitleId(),data));
        }
        return oneList;
    }

其中的getcChild的方法递归查询子集菜单

    public List getChild(String titleId, List rootList){
        //子集
        List childList =new ArrayList<>();
        for (ICBmEvaluation icBmEvaluation : rootList){
            //遍历节点，与传过来的父id对比
            if(icBmEvaluation.getParentId().equals(titleId)){
                childList.add(icBmEvaluation);
            }
        }
        //递归退出
        if (childList.size() == 0){
            return null;
        }
        //把子集的子集再循环一遍
        for (ICBmEvaluation icBmEvaluation : childList){
            icBmEvaluation.setChildList(getChild(icBmEvaluation.getTitleId(),rootList));
        }
        return childList;
    }