三级菜单

最新推荐文章于 2022-05-17 11:14:38 发布

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本文介绍了一种基于Java实现的三级菜单递归逻辑，通过DAO层获取不同层级的菜单信息，并利用BeanUtils进行属性复制，最终形成树状结构的数据模型。

三级菜单

https://blog.youkuaiyun.com/frankcheng5143/article/details/52958486

Menu类：菜单类

@Data
@NoArgsConstructor
@RequiredArgsConstructor
public class Menu {

    @NonNull
    private String text;
    
    private String id;

    private String link;

    private String icon;

    private List<Menu> subs;

}

逻辑

	@Override
	public Map<String, Object> getMenuList() {
		List<Menu> menuList = new ArrayList<Menu>();
		Order sort = new Order(Direction.ASC, "id");
		List<MenuInfoPo> list = menuInfoDAO.findByParentId(0, new Sort(sort));// 一级
		for (MenuInfoPo designCategory : list){
			Menu cDTO = new Menu();
			BeanUtils.copyProperties(designCategory, cDTO);
			List<Menu> children = new ArrayList<Menu>();
			List<MenuInfoPo> childlist = menuInfoDAO.findByParentId(designCategory.getId(), new Sort(sort));// 二级
			for (MenuInfoPo dc : childlist) {
				Menu childDTO = new Menu();
				BeanUtils.copyProperties(dc, childDTO);
				List<Menu> childrens = new ArrayList<Menu>();
				List<MenuInfoPo> childlists = menuInfoDAO.findByParentId(dc.getId(), new Sort(sort));// 三级
				for (MenuInfoPo cs : childlists) {
					Menu childsDTO = new Menu();
					BeanUtils.copyProperties(cs, childsDTO);
					childrens.add(childsDTO);
				}
				childDTO.setSubs(childrens);
				children.add(childDTO);
			}
			cDTO.setSubs(children);
			menuList.add(cDTO);
		}
		Map<String, Object> map = new HashMap<String, Object>();
		map.put("list", menuList);
		return map;

	}

递归

   public List<Menu> getRes(String id){
       Menu cDTO = new Menu();
       List<Menu> menuList = new ArrayList<Menu>();
       List<Menu> list = menuInfoDAO.findByParentId(id, new Sort(sort));// 一级
       if(list.size()>0) {
           for (Menu designCategory : list){
               List<Menu> res = getRes(designCategory.getId());
               designCategory.setSubmenus(res);
               menuList.add(designCategory);
           }
       }
       return menuList;
   }