java实现菜单树的示例代码
作者：LonesomeRoad
这篇文章主要为大家详细介绍了java实现菜单树的相关知识,文中的示例代码讲解详细,具有一定的借鉴价值,感兴趣的小伙伴可以跟随小编一起学习一下
使用ruoyi的菜单表结构
实体类增加注解
实体类增加子菜单数组
@TableField(exist = false)
private List<Menu> children;
实现逻辑
public List<Menu> selectMenuList(String menuName, Long userId) {
//树结构
List<Menu> menuList = null;
LoginUser principal = (LoginUser) SecurityContextHolder.getContext().getAuthentication().getPrincipal();
if(checkIsAdmin.checkIsAdmin(principal.getUser().getId())){
LambdaQueryWrapper<Menu> queryWrapper = new LambdaQueryWrapper<>();
queryWrapper.like(StringUtils.isNotBlank(menuName),Menu::getMenuName, menuName);
menuList = this.menuMapper.selectList(queryWrapper);
}else{
menuList = this.menuMapper.selectMenuListByUserId(menuName,userId);
}
List<Menu> finalMenuList = menuList;
return menuList.stream()
.filter(item -> Objects.equals(item.getParentId().toString(),"0"))
.map(item -> item.setChildren(getChild(item.getId(), finalMenuList)))
.sorted(Comparator.comparingInt(menu -> (menu.getShowSort() == null ? 0 : menu.getShowSort())))
.collect(Collectors.toList());
}
private List<Menu> getChild(Long id, List<Menu> menuList){
return menuList.stream()
.filter(item -> Objects.equals(item.getParentId().toString(), id.toString()))
.map(item -> item.setChildren(getChild(item.getId(), menuList)))
.sorted(Comparator.comparingInt(menu -> (menu.getShowSort() == null ? 0 : menu.getShowSort())))
.collect(Collectors.toList());
}结果展示
{
"code": 200,
"msg": "操作成功",
"data": [
{
"id": "1731872513806221314",
"menuName": "系统管理",
"parentId": 0,
"showSort": 1,
"url": null,
"reqPath": null,
"isCache": "1",
"target": null,
"menuType": "M",
"visible": "0",
"isRefresh": null,
"perms": null,
"icon": "ep:add-location",
"createTime": "2023-12-05 11:05:58",
"updateTime": null,
"operater": "qinyi",
"componentName": null,
"children": [
{
"id": "1731936951137632258",
"menuName": "角色管理",
"parentId": "1731872513806221314",
"showSort": 1,
"url": null,
"reqPath": null,
"isCache": "1",
"target": null,
"menuType": "C",
"visible": "0",
"isRefresh": null,
"perms": null,
"icon": "ep:alarm-clock",
"createTime": "2023-12-05 15:22:01",
"updateTime": null,
"operater": "qinyi",
"componentName": null,
"children": []
},
{
"id": "1734381007881097218",
"menuName": "角色管理222",
"parentId": "1731872513806221314",
"showSort": 2,
"url": null,
"reqPath": null,
"isCache": "1",
"target": null,
"menuType": "C",
"visible": "0",
"isRefresh": null,
"perms": null,
"icon": "ep:apple",
"createTime": "2023-12-12 09:13:50",
"updateTime": null,
"operater": "qinyi",
"componentName": null,
"children": [
{
"id": "1734768479693627394",
"menuName": "新增按钮",
"parentId": "1734381007881097218",
"showSort": 1,
"url": "",
"reqPath": "",
"isCache": "1",
"target": null,
"menuType": "F",
"visible": "0",
"isRefresh": null,
"perms": null,
"icon": "",
"createTime": "2023-12-13 10:53:30",
"updateTime": null,
"operater": "qinyi",
"componentName": null,
"children": []
}
]
}
]
},
{
"id": "1732203279467573249",
"menuName": "菜单管理哦",
"parentId": 0,
"showSort": 2,
"url": null,
"reqPath": null,
"isCache": "1",
"target": null,
"menuType": "C",
"visible": "0",
"isRefresh": null,
"perms": null,
"icon": "ep:camera-filled",
"createTime": "2023-12-06 09:00:19",
"updateTime": null,
"operater": "qinyi",
"componentName": null,
"children": []
}
]
}这样写有点问题,就是模糊查询的时候,查不到数据,也就是过滤数据的时候子节点加载不到完整的树结构,做以下改动
/**
* 在树结构上做模糊查询(剪枝操作）
*/
private List<Menu> getMenuByName(List<Menu> menuList,String selectName){
Iterator<Menu> iterator = menuList.iterator();
while(iterator.hasNext()){
Menu menu = iterator.next();
if(!menu.getMenuName().contains(selectName)){
List<Menu> childrenList = menu.getChildren();
if(!CollectionUtils.isEmpty(childrenList)){
getMenuByName(childrenList, selectName);
}
if(CollectionUtils.isEmpty(childrenList)){
iterator.remove();
}
}
}
return menuList;
}以上就是java实现菜单树的示例代码的详细内容，更多关于java菜单树的资料请关注脚本之家其它相关文章！