标签:this root 循环 sql脚本 factor 接下来 文件 inno element
从数据库加载菜单及子菜单主要使用递归的方法,具体实现可看代码
首先封装一个菜单pojo
public class Menu { // 菜单id private String id; // 菜单名称 private String name; // 父菜单id private String parentId; // 菜单url private String url; // 菜单图标 private String icon; // 菜单顺序 private int order; // 子菜单 private List<Menu> childMenus; public String getId() { return id; } public void setId(String id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getParentId() { return parentId; } public void setParentId(String parentId) { this.parentId = parentId; } public String getUrl() { return url; } public void setUrl(String url) { this.url = url; } public String getIcon() { return icon; } public void setIcon(String icon) { this.icon = icon; } public int getOrder() { return order; } public void setOrder(int order) { this.order = order; } public List<Menu> getChildMenus() { return childMenus; } public void setChildMenus(List<Menu> childMenus) { this.childMenus = childMenus; } }
然后写dao接口
package com.xfma.dao; import com.xfma.pojo.Menu; import java.util.List; public interface MenuMapper { /** * 查找用户的菜单 * @return */ public List<Menu> queryMenuList(); }
接着mybatis配置映射文件
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" > <mapper namespace="com.xfma.dao.MenuMapper" > <select id="queryMenuList" resultType="com.xfma.pojo.Menu"> SELECT id,`name`,parent_id as parentId,url,icon,`order` FROM jrbac_menu ORDER BY `order` ASC </select> </mapper>
接下来是service接口
package com.xfma.service; import com.xfma.pojo.Menu; import java.util.List; public interface IMenuService { public List<Menu> listMenu(); }
service实现类
package com.xfma.service.impl; import com.xfma.dao.MenuMapper; import com.xfma.pojo.Menu; import com.xfma.service.IMenuService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import org.springframework.util.StringUtils; import java.util.ArrayList; import java.util.List; @Service public class MenuService implements IMenuService { @Autowired private MenuMapper menuMapper; public List<Menu> listMenu() { List<Menu> rootMenus = menuMapper.queryMenuList(); List<Menu> list = getMenuList(rootMenus); return list; } /** * 找出一级菜单和二级菜单 * @param rootMenus * @return */ private List<Menu> getMenuList(List<Menu> rootMenus){ List<Menu> list = new ArrayList<Menu>(); // 先找到所有的一级菜单 for (int i=0;i<rootMenus.size();i++){ Menu menu = rootMenus.get(i); //一级菜单 没有父节点 if (StringUtils.isEmpty(menu.getParentId())){ list.add(menu); } } //查找二级菜单 /** * 利用递归找出所有子菜单 */ for (Menu menu: list) { menu.setChildMenus(getChild(menu.getId(),rootMenus)); } return list; } /** * 找出子菜单 * @param id * @param rootMenu * @return */ private List<Menu> getChild(String id, List<Menu> rootMenu) { // 子菜单 List<Menu> childList = new ArrayList<Menu>(); for (Menu menu : rootMenu) { // 遍历所有节点,将父菜单id与传过来的id比较 if (!StringUtils.isEmpty(menu.getParentId())) { if (menu.getParentId().equals(id)) { childList.add(menu); } } } // 把子菜单的子菜单再循环一遍 for (Menu menu : childList) {// 没有url子菜单还有子菜单 if (StringUtils.isEmpty(menu.getUrl())) { // 递归 menu.setChildMenus(getChild(menu.getId(), rootMenu)); } } // 递归退出条件 if (childList.size() == 0) { return null; } return childList; } }
返回的结果是已经封装好的各个菜单和子菜单,只需前台遍历就可以了。
下面附上SQL脚本:
DROP TABLE IF EXISTS `jrbac_menu`; CREATE TABLE `jrbac_menu` ( `id` varchar(32) NOT NULL COMMENT ‘主键id,uuid32位‘, `name` varchar(64) NOT NULL COMMENT ‘登录用户名‘, `parent_id` varchar(32) default NULL COMMENT ‘父菜单id‘, `url` varchar(64) default NULL COMMENT ‘访问地址‘, `icon` varchar(32) default NULL COMMENT ‘菜单图标‘, `order` tinyint(4) default ‘0‘ COMMENT ‘菜单顺序‘, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT=‘菜单表‘; -- ---------------------------- -- Records of jrbac_menu -- ---------------------------- INSERT INTO `jrbac_menu` VALUES (‘1‘, ‘Forms‘, null, ‘forms.html‘, ‘fa fa-edit‘, ‘0‘); INSERT INTO `jrbac_menu` VALUES (‘2‘, ‘UI Elements‘, null, ‘‘, ‘fa fa-wrench‘, ‘1‘); INSERT INTO `jrbac_menu` VALUES (‘3‘, ‘Buttons‘, ‘2‘, ‘buttons.html‘, ‘‘, ‘0‘); INSERT INTO `jrbac_menu` VALUES (‘4‘, ‘Icons‘, ‘2‘, ‘icons.html‘, null, ‘1‘); INSERT INTO `jrbac_menu` VALUES (‘5‘, ‘Multi-Level Dropdown‘, ‘‘, ‘‘, ‘fa fa-sitemap‘, ‘2‘); INSERT INTO `jrbac_menu` VALUES (‘6‘, ‘Second Level Item‘, ‘5‘, ‘second.html‘, null, ‘0‘); INSERT INTO `jrbac_menu` VALUES (‘7‘, ‘Third Level‘, ‘5‘, null, ‘‘, ‘1‘); INSERT INTO `jrbac_menu` VALUES (‘8‘, ‘Third Level Item‘, ‘7‘, ‘third.html‘, null, ‘0‘);
标签:this root 循环 sql脚本 factor 接下来 文件 inno element
原文地址:https://www.cnblogs.com/blog411032/p/8994978.html