菜单树状结构实现

一时失言乱红尘 2023-01-07 04:59 144阅读 0赞

工具类：

package cn.cfae.bcbbs.modules.role.utils;
    
    import cn.cfae.bcbbs.common.utils.CfaeBeanUtils;
    import cn.cfae.bcbbs.modules.role.dao.entity.BcbbsAAuthorization;
    import cn.cfae.bcbbs.modules.role.web.vo.Menu;
    import cn.cfae.bcbbs.modules.role.web.vo.Meta;
    
    import java.util.ArrayList;
    import java.util.Iterator;
    import java.util.List;
    
    /**
     * @description:
     * @author: ljy
     * @date: 2020/11/26
     * @version: 1.0
     */
    public class MenuUtils {
    
        /**
         * 获取树
         * @param bcbbsAAuthorizations
         * @return
         */
        public static List<Menu> treeMenuList(List<BcbbsAAuthorization> bcbbsAAuthorizations){
    
            List<Menu> sourceList = conversion(bcbbsAAuthorizations);
    
            List<Menu> targetList=new ArrayList<>();
            if (sourceList==null) {
                return null;
            }
            List<Menu> pmenus = new ArrayList<>();
    
            // 先统计出来所有的一级
            Iterator itr = sourceList.iterator();
            while (itr.hasNext()) {
                Menu menu = (Menu) itr.next();
                if(menu.getParentId() == 0L || menu == null){
                    pmenus.add(menu);
                    itr.remove();
                }
            }
    
            for (Menu menu: pmenus) {
                targetList.add(treeRoot(sourceList, menu));
            }
            return targetList;
        }
    
        /**
         * 递归获取菜单
         * treeRoot:( ). <br/>
         * @author lishang
         * @param sourceList
         * @param rootMenu
         * @return
         */
        private static Menu treeRoot(List<Menu> sourceList, Menu rootMenu) {
            if (sourceList == null) {
                return null;
            }
            List<Menu> childList=new ArrayList<Menu>();
            for (Menu menu : sourceList) {
                if(rootMenu.getId().equals(menu.getParentId())){
                    Menu menuChild = treeRoot(sourceList, menu);
                    childList.add(menuChild);
                }
            }
            if(childList.size()==0){
                return rootMenu;
            }
            rootMenu.setChildren(childList);
            return rootMenu;
        }
    
        /**
         * 装换数据
         * @param bcbbsAAuthorizations 数据库类型
         * @return 菜单类型
         */
        private static List<Menu> conversion(List<BcbbsAAuthorization> bcbbsAAuthorizations) {
    
            if (bcbbsAAuthorizations == null){
                return null;
            }
    
            List<Menu> menus = new ArrayList<>();
            for (BcbbsAAuthorization bcbbsAAuthorization : bcbbsAAuthorizations) {
                Menu menu = new Menu();
                CfaeBeanUtils.copyNotNullProperties(bcbbsAAuthorization, menu);
                menu.setPath(bcbbsAAuthorization.getResourcePath());
                menu.setHidden("1".equals(bcbbsAAuthorization.getHidden()));
                menu.setName(bcbbsAAuthorization.getResourceName());
                Meta meta = new Meta();
                meta.setTitle(bcbbsAAuthorization.getTitle());
                meta.setIcon(bcbbsAAuthorization.getIcon());
                meta.setKeepAlive("1".equals(bcbbsAAuthorization.getKeepAlive()));
                menu.setMeta(meta);
                menus.add(menu);
            }
    
            return menus;
        }
    
    }

涉及实体：

package cn.xxx.modules.role.dao.entity;
    
    import cn.cfae.bcbbs.modules.pub.Entity.BaseEntity;
    import lombok.Data;
    
    import java.io.Serializable;
    import java.util.Date;
    
    /**
     * 权限表实体类
     *
     * @author makejava
     * @since 2020-11-26 13:53:05
     */
    @Data
    public class BcbbsAAuthorization extends BaseEntity {
        /**
         * 资源名称
         */
        private String resourceName;
        /**
         * 资源访问地址
         */
        private String resourcePath;
        /**
         * 父级id
         */
        private Long parentId;
    
        private String hidden;
    
        private String component;
    
        private String redirect;
    
        private String title;
    
        private String icon;
        /**
         * 是否生效 1-生效 0-失效
         */
        private String status;
        /**
         * 排序
         */
        private Long sort;
    
        private String keepAlive;
    
    }

package cn.xxx.modules.role.web.vo;
    
    import lombok.Data;
    
    /**
     * @description:
     * @author: ljy
     * @date: 2020/11/26
     * @version: 1.0
     */
    @Data
    public class Meta {
    
        private String title;
        private String icon;
        private boolean keepAlive = false;
    
    }

package cn.xxx.modules.role.web.vo;
    
    import lombok.AllArgsConstructor;
    import lombok.Data;
    import lombok.NoArgsConstructor;
    
    import java.util.Collections;
    import java.util.List;
    
    /**
     * @description:
     * @author: ljy
     * @date: 2020/11/26
     * @version: 1.0
     */
    @Data
    @AllArgsConstructor
    @NoArgsConstructor
    public class Menu {
    
        private Long id;
        private String path = "";
        private String component = "";
        private boolean hidden;
        private String redirect = "";
        private String name = "";
        /**
         * 父级id
         */
        private Long parentId;
        private Meta meta;
        private List<Menu> children = Collections.EMPTY_LIST;
    }