将扁平型组织结构调整为树状架构：上下级部门关系的与转化
最编程
2024-07-24 20:57:49
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概要：
比如企业微信API中获取部门列表的接口（https://work.weixin.qq.com/api/doc/90000/90135/90208），该接口返回的部门列表中，每个部门有一个字段关联其上级部门，很多时候需要根据返回的列表获取某个部门的所有上级部门、子部门，以及转换成树形结构。
代码：
部门实体类：
package com.example.study.entity;
import lombok.Data;
/**
* 部门实体类
*/
@Data
public class DepartmentEntity {
/**
* 部门id
*/
private Integer id;
/**
* 部门名称
*/
private String name;
/**
* 上级部门id
*/
private Integer parentId;
}
部门Vo类：
package com.example.study.vo;
import com.example.study.entity.DepartmentEntity;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.util.Objects;
import java.util.Set;
/**
* 部门Vo类
* 由于部门树一般只存在于给前端展示的Vo中，所以将子部门集合放在Vo中
*/
@Data
@NoArgsConstructor
public class DepartmentVo extends DepartmentEntity {
/**
* 子部门集合
*/
private Set<DepartmentVo> childDepartments;
public DepartmentVo(DepartmentEntity entity) {
super.setId(entity.getId());
super.setName(entity.getName());
super.setParentId(entity.getParentId());
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
if (!super.equals(o)) return false;
DepartmentVo that = (DepartmentVo) o;
return Objects.equals(childDepartments, that.childDepartments);
}
@Override
public int hashCode() {
return Objects.hash(super.hashCode(), childDepartments);
}
}
Util类：
package com.example.study.util;
import com.example.study.entity.DepartmentEntity;
import com.example.study.entity.DepartmentVo;
import lombok.extern.slf4j.Slf4j;
import java.util.*;
import java.util.function.Function;
import java.util.stream.Collectors;
/**
* 部门常用方法
* 所有方法均未作入参校验，使用时请根据实际情况加上入参校验
*/
@Slf4j
public class DepartmentUtil {
/**
* 获取最上层部门
*
* @param departments 部门列表
* @return 最上层部门
*/
public static DepartmentEntity getTopDepartment(List<DepartmentEntity> departments) {
if (departments == null || departments.size() == 0) {
throw new RuntimeException("未获取到最上层部门！");
}
Set<Integer> departmentIdSet = departments.stream().map(o -> o.getId()).collect(Collectors.toSet());
for (DepartmentEntity department : departments) {
if (!departmentIdSet.contains(department.getParentId())) {
return department;
}
}
log.error("未获取到最上层部门！");
throw new RuntimeException("未获取到最上层部门！");
}
/**
* 获取所有上级部门
*
* @param departments 部门列表
* @param currentDepartment 当前部门
* @return 当前部门的所有上级部门列表
*/
public static Set<DepartmentEntity> getParentDepartments(List<DepartmentEntity> departments, DepartmentEntity currentDepartment) {
Set<DepartmentEntity> parentDepartmentSet = new HashSet<>();
if (departments == null || departments.size() == 0 || currentDepartment == null) {
// 当前部门为空时，认为当前部门为最上层部门
return parentDepartmentSet;
}
DepartmentEntity topDepartment = getTopDepartment(departments);
Map<Integer, DepartmentEntity> idDepartmentMap = departments.stream().collect(Collectors.toMap(DepartmentEntity::getId, Function.identity()));
DepartmentEntity parentDepartment = idDepartmentMap.get(currentDepartment.getParentId());
while (parentDepartment != null) {
parentDepartmentSet.add(parentDepartment);
if (parentDepartment.getId().equals(topDepartment.getId())) {
break;
}
parentDepartment = idDepartmentMap.get(parentDepartment.getParentId());
}
return parentDepartmentSet;
}
/**
* 获取所有下级部门
*
* @param departments 部门列表
* @param currentDepartment 当前部门
* @return 当前部门的所有下级部门列表
*/
public static Set<DepartmentEntity> getChildDepartments(List<DepartmentEntity> departments, DepartmentEntity currentDepartment) {
Set<DepartmentEntity> childDepartmentSet = new HashSet<>();
if (departments == null || departments.size() == 0) {
return childDepartmentSet;
}
if (currentDepartment == null) {
// 当前部门为空时，认为当前部门为最上层部门
childDepartmentSet.addAll(departments);
return childDepartmentSet;
}
Map<Integer, Set<DepartmentEntity>> parentChildMap = getParentChildMap(departments);
doGetChildDepartments(parentChildMap, currentDepartment, childDepartmentSet);
return childDepartmentSet;
}
/**
* 获取父部门id -> 子部门 Map
*
* @param departments 部门列表
* @return 部门id -> 子部门 Map
*/
private static Map<Integer, Set<DepartmentEntity>> getParentChildMap(List<DepartmentEntity> departments) {
Map<Integer, Set<DepartmentEntity>> parentChildMap = new HashMap<>();
for (DepartmentEntity department : departments) {
Set<DepartmentEntity> childDepartmentSet = parentChildMap.get(department.getParentId());
if (childDepartmentSet == null) {
childDepartmentSet = new HashSet<>();
childDepartmentSet.add(department);
parentChildMap.put(department.getParentId(), childDepartmentSet);
} else {
childDepartmentSet.add(department);
}
}
return parentChildMap;
}
/**
* 递归获取当前部门的所有子部门
*
* @param parentChildMap 部门id -> 子部门 Map
* @param currentDepartment 当前部门
* @param childDepartmentSet 子部门Set
*/
private static void doGetChildDepartments(Map<Integer, Set<DepartmentEntity>> parentChildMap, DepartmentEntity currentDepartment, Set<DepartmentEntity> childDepartmentSet) {
Set<DepartmentEntity> childSet = parentChildMap.get(currentDepartment.getId());
if (childSet != null) {
childDepartmentSet.addAll(childSet);
for (DepartmentEntity child : childSet) {
doGetChildDepartments(parentChildMap, child, childDepartmentSet);
}
}
}
/**
* 获取部门树
*
* @param departments 部门列表
* @return 部门树
*/
public static DepartmentVo getDepartmentTree(List<DepartmentEntity> departments) {
if (departments == null || departments.size() == 0) {
return new DepartmentVo();
}
Map<Integer, Set<DepartmentEntity>> parentChildMap = getParentChildMap(departments);
DepartmentEntity topDepartment = getTopDepartment(departments);
DepartmentVo rootNode = new DepartmentVo(topDepartment);
doGetDepartmentTree(parentChildMap, rootNode);
return rootNode;
}
/**
* 递归设置所有子部门的子部门
*
* @param parentChildMap 部门id -> 子部门 Map
* @param rootNode 根部门（对最外一层递归，根部门即为最上层部门）
*/
private static void doGetDepartmentTree(Map<Integer, Set<DepartmentEntity>> parentChildMap, DepartmentVo rootNode) {
Set<DepartmentEntity> childSet = parentChildMap.get(rootNode.getId());
Set<DepartmentVo> childVoSet = new HashSet<>();
if (childSet != null) {
childSet.forEach(o -> childVoSet.add(new DepartmentVo(o)));
rootNode.setChildDepartments(childVoSet);
for (DepartmentVo childVo : childVoSet) {
doGetDepartmentTree(parentChildMap, childVo);
}
} else {
rootNode.setChildDepartments(childVoSet);
}
}
/**
* 获取部门集合
*
* @param rootNode 根部门
* @return 部门集合
*/
public static Set<DepartmentEntity> getDepartmentSet(DepartmentVo rootNode) {
Set<DepartmentEntity> set = new HashSet<>();
if (rootNode == null) {
return set;
}
doGetDepartmentSet(set, rootNode);
return set;
}
/**
* 深度遍历所有部门
*
* @param set 部门set
* @param rootNode 根部门
*/
private static void doGetDepartmentSet(Set<DepartmentEntity> set, DepartmentVo rootNode) {
if (rootNode != null) {
set.add(new DepartmentVo(rootNode));
for (DepartmentVo childDepartment : rootNode.getChildDepartments()) {
doGetDepartmentSet(set, childDepartment);
}
}
}
}
测试类：
package com.example.study.common;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.example.study.entity.DepartmentEntity;
import com.example.study.entity.DepartmentVo;
import com.example.study.util.DepartmentUtil;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.Set;
public class DepartmentTest {
public static void main(String[] args) {
String departmentsStr = "[ { \"id\": 0, \"name\": \"部门0（根部门）\", \"parentId\": -1 }, { \"id\": 1, \"name\": \"部门1\", \"parentId\": 0 }, { \"id\": 2, \"name\": \"部门2\", \"parentId\": 0 }, { \"id\": 3, \"name\": \"部门3\", \"parentId\": 0 }, { \"id\": 4, \"name\": \"部门4\", \"parentId\": 2 }, { \"id\": 5, \"name\": \"部门5\", \"parentId\": 2 }, { \"id\": 6, \"name\": \"部门6\", \"parentId\": 3 }, { \"id\": 7, \"name\": \"部门7\", \"parentId\": 3 }, { \"id\": 8, \"name\": \"部门8\", \"parentId\": 6 }, { \"id\": 9, \"name\": \"部门9\", \"parentId\": 7 }, { \"id\": 10, \"name\": \"部门10\", \"parentId\": 9 }, { \"id\": 11, \"name\": \"部门11\", \"parentId\": 9 } ]";
List<DepartmentEntity> departments = JSONArray.parseArray(departmentsStr, DepartmentEntity.class);
System.out.println("all:" + JSON.toJSONString(departments));
DepartmentEntity topDepartment = DepartmentUtil.getTopDepartment(departments);
System.out.println("top:" + JSON.toJSONString(topDepartment));
Integer index = new Random().nextInt(departments.size());
DepartmentEntity currentDepartment = departments.get(index);
System.out.println("current:" + JSON.toJSONString(currentDepartment));
Set<DepartmentEntity> parentDepartments = DepartmentUtil.getParentDepartments(departments, currentDepartment);
System.out.println("parents:" + JSON.toJSONString(parentDepartments));
Set<DepartmentEntity> childDepartments = DepartmentUtil.getChildDepartments(departments, currentDepartment);
System.out.println("child:" + JSON.toJSONString(childDepartments));
DepartmentVo departmentTree = DepartmentUtil.getDepartmentTree(departments);
String treeStr = JSON.toJSONString(departmentTree);
System.out.println("tree:" + treeStr);
System.out.println("all:" + JSON.toJSONString(departments));
DepartmentVo departmentVo = JSONObject.parseObject(treeStr, DepartmentVo.class);
Set<DepartmentEntity> departmentSet = DepartmentUtil.getDepartmentSet(departmentVo);
System.out.println("set:" + JSON.toJSONString(departmentSet));
List<DepartmentEntity> nList = new ArrayList<>(departmentSet);
DepartmentEntity nTopDepartment = DepartmentUtil.getTopDepartment(nList);
System.out.println("new Top:" + JSON.toJSONString(nTopDepartment));
DepartmentVo nDepartmentTree = DepartmentUtil.getDepartmentTree(nList);
System.out.println("new Tree:" + JSON.toJSONString(nDepartmentTree));
System.out.println("all:" + JSON.toJSONString(departments));
}
}
测试结果：
C:\software\Java\jdk1.8.0_261\bin\java.exe "-javaagent:C:\software\JetBrains\IntelliJ IDEA 2019.2.4\lib\idea_rt.jar=51715:C:\software\JetBrains\IntelliJ IDEA 2019.2.4\bin" -Dfile.encoding=UTF-8 -classpath 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com.example.study.common.DepartmentTest
all:[{"id":0,"name":"部门0（根部门）","parentId":-1},{"id":1,"name":"部门1","parentId":0},{"id":2,"name":"部门2","parentId":0},{"id":3,"name":"部门3","parentId":0},{"id":4,"name":"部门4","parentId":2},{"id":5,"name":"部门5","parentId":2},{"id":6,"name":"部门6","parentId":3},{"id":7,"name":"部门7","parentId":3},{"id":8,"name":"部门8","parentId":6},{"id":9,"name":"部门9","parentId":7},{"id":10,"name":"部门10","parentId":9},{"id":11,"name":"部门11","parentId":9}]
top:{"id":0,"name":"部门0（根部门）","parentId":-1}
current:{"id":5,"name":"部门5","parentId":2}
parents:[{"id":2,"name":"部门2","parentId":0},{"id":0,"name":"部门0（根部门）","parentId":-1}]
child:[]
tree:{"childDepartments":[{"childDepartments":[],"id":1,"name":"部门1","parentId":0},{"childDepartments":[{"childDepartments":[{"childDepartments":[{"childDepartments":[],"id":10,"name":"部门10","parentId":9},{"childDepartments":[],"id":11,"name":"部门11","parentId":9}],"id":9,"name":"部门9","parentId":7}],"id":7,"name":"部门7","parentId":3},{"childDepartments":[{"childDepartments":[],"id":8,"name":"部门8","parentId":6}],"id":6,"name":"部门6","parentId":3}],"id":3,"name":"部门3","parentId":0},{"childDepartments":[{"childDepartments":[],"id":4,"name":"部门4","parentId":2},{"childDepartments":[],"id":5,"name":"部门5","parentId":2}],"id":2,"name":"部门2","parentId":0}],"id":0,"name":"部门0（根部门）","parentId":-1}
all:[{"id":0,"name":"部门0（根部门）","parentId":-1},{"id":1,"name":"部门1","parentId":0},{"id":2,"name":"部门2","parentId":0},{"id":3,"name":"部门3","parentId":0},{"id":4,"name":"部门4","parentId":2},{"id":5,"name":"部门5","parentId":2},{"id":6,"name":"部门6","parentId":3},{"id":7,"name":"部门7","parentId":3},{"id":8,"name":"部门8","parentId":6},{"id":9,"name":"部门9","parentId":7},{"id":10,"name":"部门10","parentId":9},{"id":11,"name":"部门11","parentId":9}]
set:[{"id":1,"name":"部门1","parentId":0},{"id":9,"name":"部门9","parentId":7},{"id":3,"name":"部门3","parentId":0},{"id":10,"name":"部门10","parentId":9},{"id":7,"name":"部门7","parentId":3},{"id":4,"name":"部门4","parentId":2},{"id":0,"name":"部门0（根部门）","parentId":-1},{"id":8,"name":"部门8","parentId":6},{"id":2,"name":"部门2","parentId":0},{"id":6,"name":"部门6","parentId":3},{"id":5,"name":"部门5","parentId":2},{"id":11,"name":"部门11","parentId":9}]
new Top:{"id":0,"name":"部门0（根部门）","parentId":-1}
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