java递归树形菜单

本次读取数据只是依照我项目逻辑
1、先获取所有菜单
List list=baseMenuService.getPowerTree(ParentMenuId);
2、在从菜单中得到所有一级菜单
List rootMenu=new ArrayList<>();
for (int i=0;i<list.size();i++){
if (list.get(i).getParentmenuid()==0){
rootMenu.add(dealMenuItem(list.get(i)));

        }
    }

3、循环一级菜单，对每个一级菜单进行递归
for (BaseMenu menu:rootMenu){
menu.setChildren(getChild(menu.getId(),list));
}
4、递归方法
/**
* 递归菜单
*/
private List getChild(Integer id,List allList){
//子菜单
List childList=new ArrayList<>();
for (BaseMenu menu:allList){
if (menu.getParentmenuid().equals(id)){
childList.add(dealMenuItem(menu));
}
}

    //把子菜单的子菜单在循环一遍
    for (BaseMenu menu:childList){
        menu.setChildren(getChild(menu.getId(),allList));
    }
    //递归退出条件
    if (childList.size()==0){
        return null;
    }
    return childList;
}

private BaseMenu dealMenuItem(BaseMenu menu){
    JSONArray jsonArray=JSONArray.parseArray(menu.getMenupower());
    List<BasePower> powers=new ArrayList<>();

    if (jsonArray.isEmpty()){
        jsonArray=JSONArray.parseArray("[{\"PowerId\":7,\"PowerName\":\"查看\"}]");
    }

    for (int i=0;i<jsonArray.size();i++){

        JSONObject object=jsonArray.getJSONObject(i);
        BasePower basePower=new BasePower();
        basePower.setPowerid(object.getInteger("PowerId"));
        basePower.setPowername(object.getString("PowerName"));
        powers.add(basePower);
        menu.setPower(powers);
    }
    return  menu;
}