一起养成写作习惯！这是我参与「掘金日新计划 · 4 月更文挑战」的第16天，点击查看活动详情。
一、权限树是什么
在写项目的权限管理模块、用户系统的时候经常碰见类似的树结构我们一般习惯称之为权限树，权限树应用的地方有很多，比较常见的有：权限管理时候的树状图（如上图），页面左侧的一二三级的菜单，物品分类的树状菜单。
对象工具类：
package com.unisound.iot.smart.dao.model.saas;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;
import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
import lombok.Data;
import org.springframework.beans.BeanUtils;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
/**
@author zhangtonghao
@create 2021-04-27 14:34
*/
@Data
@ApiModel(value ="Saas功能模块树节点", description ="Saas功能模块树节点")
public class TenantModuleTreeNode implements Comparable {
@ApiModelProperty(value ="id唯一标识", position =1, required =true)
@JsonSerialize(using =ToStringSerializer.class)
private Long id;
@ApiModelProperty(value ="模块名称", position =1, required =true)
private String moduleName;
@ApiModelProperty(value ="父模块id", position =1, required =false)
private Long parentId;
@ApiModelProperty(value ="模块路径", position =1, required =false)
private String modulePath;
@ApiModelProperty(value ="模块图标", position =1, required =false)
private String moduleIcon;
@ApiModelProperty(value ="http方法", position =1, required =false)
private String httpMethod;
@ApiModelProperty(value ="排序", position =1, required =false)
private Integer sortNum;
@ApiModelProperty(value ="模块代码", position =1, required =false)
private String moduleCode;
@ApiModelProperty(value ="是否可用", position =1, required =false)
private Integer active;
@ApiModelProperty(value ="版本：pro、lite", position =1, required =false)
private String serviceVersion;
@ApiModelProperty(value ="管理模式：1：标准模式 2：直客 3：非直客", position =1, required =false)
private Integer custMode;
@ApiModelProperty(value ="是否具备此模块", position =1, required =false)
private Boolean isHas =false;
@ApiModelProperty(value ="子菜单列表", position =1, required =false)
private List children;
public static List listToTree(List list) {
//用递归找子。
List treeList =new ArrayList();
for (TenantModuleTreeNode tree :list) {
if (tree.getParentId() == -1) {
treeList.add(findChildren(tree, list));
}
}
return treeList;
}
public static TenantModuleTreeNode findChildren(TenantModuleTreeNode tree, List list) {
for (TenantModuleTreeNode node :list) {
if (node.getParentId().longValue() ==tree.getId()) {
if (tree.getChildren() ==null) {
tree.setChildren(new ArrayList());
}
tree.getChildren().add(findChildren(node, list));
}
}
return tree;
}
/**
* 转换为树
*
* @param moduleList
* @return
*/
public static List convertToTree(List moduleList) {
if (moduleList ==null ||moduleList.size() ==0) {
return null;
}
List list =new ArrayList<>();
for (TenantModule module :moduleList) {
TenantModuleTreeNode node =new TenantModuleTreeNode();
BeanUtils.copyProperties(module, node);
list.add(node);
}
return sort(listToTree(list));
}
/**
* 转换为树并设置是否具备对应模块
*/
public static List convertToTreeAndIsHas(List allModuleList, List idList) {
if (allModuleList ==null ||allModuleList.size() ==0) {
return null;
}
List list =new ArrayList<>();
for (TenantModule module :allModuleList) {
TenantModuleTreeNode node =new TenantModuleTreeNode();
BeanUtils.copyProperties(module, node);
if (idList !=null &&idList.size() >0) {
for (Long um :idList) {
if (um ==module.getId().longValue()) {
node.setIsHas(true);
break;
}
}
}
list.add(node);
}
return sort(listToTree(list));
}
@Override
public int compareTo(TenantModuleTreeNode other) {
if (other ==null) {
return 1;
}
if (this.getSortNum() ==null ||other.getSortNum() ==null) {
return 1;
}
return this.getSortNum() -other.getSortNum();
}
private static List sort(List adminModuleTreeNodeList) {
if (adminModuleTreeNodeList ==null ||adminModuleTreeNodeList.size() ==0) {
return adminModuleTreeNodeList;
}
for (TenantModuleTreeNode TenantModuleTreeNode :adminModuleTreeNodeList) {
if (TenantModuleTreeNode.getChildren() !=null) {
Collections.sort(TenantModuleTreeNode.getChildren());
sort(TenantModuleTreeNode.getChildren());
}
}
return adminModuleTreeNodeList;
}
}
