诚之和:教你使用Java实现树形菜单对象 实例代码解析

本文实例为大家分享了java实现树形菜单对象的具体代码，供大家参考，具体内容如下

1、SysMenu

package com.zy.shiro.domain;import com.baomidou.mybatisplus.annotation.IdType;import com.baomidou.mybatisplus.annotation.TableField;import com.baomidou.mybatisplus.annotation.TableId;import com.fasterxml.jackson.annotation.JsonInclude;import io.swagger.annotations.ApiModel;import lombok.Data;import lombok.EqualsAndHashCode;import lombok.experimental.Accessors;import java.io.Serializable;import java.util.ArrayList;import java.util.List;/**
 * sys_menu
 * @author
 */@Data@EqualsAndHashCode(callSuper = false)@Accessors(chain = true)@ApiModel(value="SysMenu对象", description="菜单管理")public class SysMenu implements Serializable {    @TableId(value = "menu_id", type = IdType.AUTO)    private Long menuId;    /**
     * 父菜单id，父菜单为0
     */
    private Long parentId;    /**
     * 菜单名称
     */
    private String menuName;    /**
     * 菜单url
     */
    private String url;    /**
     * 授权(多个用逗号分隔，如：user:list,user:create)
     */
    private String permisions;    /**
     * 类型   0：目录   1：菜单   2：按钮
     */
    private Integer menuType;    /**
     * 菜单图标
     */
    private String icon;    /**
     * 排序
     */
    private Integer orderNum;    @TableField(exist = false)    private List<SysMenu> list;//    @JsonInclude(value = JsonInclude.Include.NON_EMPTY)//    private List<SysMenu> child=new ArrayList<>();

    private static final long serialVersionUID = 1L;

}

2、TreeNode

package com.zy.common.tree;import com.fasterxml.jackson.annotation.JsonInclude;import lombok.AllArgsConstructor;import lombok.Data;import lombok.NoArgsConstructor;import sun.reflect.generics.tree.Tree;import java.io.Serializable;import java.util.ArrayList;import java.util.List;@Data@AllArgsConstructor@NoArgsConstructorpublic class TreeNode implements Serializable {    private Integer id;    private Integer pid;    private String title;    private String icon;    private String href;    private String target;    private Boolean spread;    @JsonInclude(value = JsonInclude.Include.NON_EMPTY)    private List<TreeNode> child=new ArrayList<>();    /**
     * 登陆成功之后系统主而需要的菜单树的json对象构造器
     * @param id
     * @param pid
     * @param title
     * @param icon
     * @param href
     * @param target
     * @param spread
     */
    public TreeNode(Integer id, Integer pid, String title, String icon, String href, String target, Boolean spread) {        this.id = id;        this.pid = pid;        this.title = title;        this.icon = icon;        this.href = href;        this.target = target;        this.spread = spread;
    }    public  static class TreeNodeBuilder{        /**
         *
         * @param treeNodes 要生成有层级关系的源数据
         * @param topId  最顶层的pid 根节点的pid
         * @return
         */
        public static List<TreeNode> build(List<TreeNode> treeNodes,Integer topId){

            List<TreeNode> nodes=new ArrayList<>();            for (TreeNode n1 : treeNodes) {                if(n1.getPid().equals(topId)){                    //说明n1节点是
                    nodes.add(n1);
                }                for (TreeNode n2 : treeNodes) {                    if(n2.getPid().equals(n1.getId())){                        //说明n2是n1的子节点 应该放到n1的clild里面
                        n1.getChild().add(n2);
                    }
                }
            }            return nodes;
        }
    }
}

3、SysMenuServiceImpl

根据用户id查询该用户所拥有的菜单

// 1 用户的id 查询角色
    List<Object> roleIds = sysUserRoleMapper.selectObjs(new LambdaQueryWrapper<SysUserRole>().select(
      SysUserRole::getRoleId
      ).
        eq(SysUserRole::getUserId, userId)
    );    if (roleIds == null || roleIds.isEmpty()) {      return menuAuthResult;
    }    // 2 通过角色的id 查询菜单的id
    List<Object> menuIds = sysRoleMenuMapper.selectObjs(new LambdaQueryWrapper<SysRoleMenu>().select(
      SysRoleMenu::getMenuId
      ).in(SysRoleMenu::getRoleId, roleIds)
    );    if (menuIds == null || menuIds.isEmpty()) {      return menuAuthResult;
    }    // 3 通过菜单的Id 查询菜单的数据
    List<SysMenu> sysMenus = sysMenuMapper.selectList(new LambdaQueryWrapper<SysMenu>().in(SysMenu::getMenuId, menuIds));    if (sysMenus == null || sysMenus.isEmpty()) {      return menuAuthResult;
    }

查询出来的menu集合：

4、测试

@Test
  public  void test3() {
    SysUser sysUser = sysUserMapper.selectById(1);
    List<SysMenu> menuList = null;    if (null != sysUser) {
      menuList = this.sysMenuService.queryeMenuByUserIdForList(sysUser.getUserId());
      List<com.zy.common.tree.TreeNode> treeNodes=new ArrayList<>();      for (SysMenu m : menuList) {
        treeNodes.add(new com.zy.common.tree.TreeNode(m.getMenuId().intValue(),m.getParentId().intValue(),m.getMenuName(),m.getIcon(),m.getUrl(),"_self",Boolean.TRUE));
      }
      List<com.zy.common.tree.TreeNode> build = com.zy.common.tree.TreeNode.TreeNodeBuilder.build(treeNodes, 0);
      System.out.println(build);

treeNodes:

buid后的树形结构：

赞 (0)

相关推荐