java递归把list菜单列表转为菜单树

java递归把列表转为菜单树

菜单实体类

package com.utils.menu;import java.util.List;public class Menu {private String name;private String icon;private String id;private String isLeaf; //1：目录      0：叶子private String parentId;private List<Menu> children;public String getName() {return name;}public void setName(String name) {this.name = name;}public String getIcon() {return icon;}public void setIcon(String icon) {this.icon = icon;}public String getId() {return id;}public void setId(String id) {this.id = id;}public String getIsLeaf() {return isLeaf;}public void setIsLeaf(String isLeaf) {this.isLeaf = isLeaf;}public String getParentId() {return parentId;}public void setParentId(String parentId) {this.parentId = parentId;}public List<Menu> getChildren() {return children;}public void setChildren(List<Menu> children) {this.children = children;}@Overridepublic String toString() {return "Menu [name=" + name + ", icon=" + icon + ", id=" + id + ", isLeaf=" + isLeaf + ", parentId=" + parentId+ ", children=" + children + "]";}}

菜单树工具类

package com.utils.menu;import java.util.ArrayList;
import java.util.List;/*** 菜单树工具类*项目名称：text   * 类名称：MenuTreeUtil   * 类描述：   把菜单列表转换为树形结构* @version*/
public class MenuTreeUtil {/*** 递归给父节点找孩子节点* @param list 目录list* @param root 父节点id* @return 该父节点id下的所有子节点list集合*/public List<Menu> findChildren(List<Menu> list,String root){List<Menu> children = new ArrayList<Menu>();//1、遍历list,给root找孩子for(Menu menu : list) {//2、判断父节点是否为rootif(root.equals(menu.getParentId())) {children.add(menu);}}//3、遍历孩子节点list，判断子节点是否有目录节点，有则需要递归找孩子for(Menu menu : children) {//4、判断是否为目录，是则递归，给该节点找孩子if("1".equals(menu.getIsLeaf())) {menu.setChildren(findChildren(list,menu.getId()));}}return children;}
}

调用

package com.utils.menu;import java.util.List;import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;public class MenuTreeTest {public static void main(String[] args) {String menuListStr = "[{\"id\":1,\"name\":\"一级菜单\",\"icon\":\"icon1\",\"parentId\":\"0\",\"isLeaf\":\"1\"},{\"id\":2,\"name\":\"二级菜单\",\"icon\":\"icon1\",\"parentId\":\"0\",\"isLeaf\":\"1\"},{\"id\":3,\"name\":\"三级菜单\",\"icon\":\"icon1\",\"parentId\":\"0\",\"isLeaf\":\"1\"},{\"id\":4,\"name\":\"四级菜单\",\"icon\":\"icon1\",\"parentId\":\"0\",\"isLeaf\":\"1\"},{\"id\":5,\"name\":\"一级子菜单\",\"icon\":\"icon1\",\"parentId\":\"1\",\"isLeaf\":\"0\"},{\"id\":6,\"name\":\"一级子菜单\",\"icon\":\"icon1\",\"parentId\":\"1\",\"isLeaf\":\"1\"},{\"id\":7,\"name\":\"二级子菜单\",\"icon\":\"icon1\",\"parentId\":\"2\",\"isLeaf\":\"0\"},{\"id\":8,\"name\":\"三级子菜单\",\"icon\":\"icon1\",\"parentId\":\"3\",\"isLeaf\":\"0\"},{\"id\":9,\"name\":\"一级孙子菜单\",\"icon\":\"icon1\",\"parentId\":\"6\",\"isLeaf\":\"0\"}]";System.out.println(menuListStr.replace("\\", ""));List<Menu> list = JSONArray.parseArray(menuListStr, Menu.class);MenuTreeUtil menuTeeeUtil = new MenuTreeUtil();List<Menu> result = menuTeeeUtil.findChildren(list,"0");System.out.println(result);String resultStr = JSON.toJSONString(result);System.out.println(resultStr);}
}

待转的list集合 json格式

[{"id": 1,"name": "一级菜单","icon": "icon1","parentId": "0","isLeaf": "1"},{"id": 2,"name": "二级菜单","icon": "icon1","parentId": "0","isLeaf": "1"},{"id": 3,"name": "三级菜单","icon": "icon1","parentId": "0","isLeaf": "1"},{"id": 4,"name": "四级菜单","icon": "icon1","parentId": "0","isLeaf": "1"},{"id": 5,"name": "一级子菜单","icon": "icon1","parentId": "1","isLeaf": "0"},{"id": 6,"name": "一级子菜单","icon": "icon1","parentId": "1","isLeaf": "1"},{"id": 7,"name": "二级子菜单","icon": "icon1","parentId": "2","isLeaf": "0"},{"id": 8,"name": "三级子菜单","icon": "icon1","parentId": "3","isLeaf": "0"},{"id": 9,"name": "一级孙子菜单","icon": "icon1","parentId": "6","isLeaf": "0"}
]

转化过的树形list json格式

[{"children": [{"icon": "icon1","id": "5","isLeaf": "0","name": "一级子菜单","parentId": "1"},{"children": [{"icon": "icon1","id": "9","isLeaf": "0","name": "一级孙子菜单","parentId": "6"}],"icon": "icon1","id": "6","isLeaf": "1","name": "一级子菜单","parentId": "1"}],"icon": "icon1","id": "1","isLeaf": "1","name": "一级菜单","parentId": "0"},{"children": [{"icon": "icon1","id": "7","isLeaf": "0","name": "二级子菜单","parentId": "2"}],"icon": "icon1","id": "2","isLeaf": "1","name": "二级菜单","parentId": "0"},{"children": [{"icon": "icon1","id": "8","isLeaf": "0","name": "三级子菜单","parentId": "3"}],"icon": "icon1","id": "3","isLeaf": "1","name": "三级菜单","parentId": "0"},{"children": [],"icon": "icon1","id": "4","isLeaf": "1","name": "四级菜单","parentId": "0"}
]

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java递归把list菜单列表转为菜单树

java递归把列表转为菜单树

菜单实体类

菜单树工具类

调用

待转的list集合 json格式

转化过的树形list json格式

java递归把list菜单列表转为菜单树相关推荐

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