java将本地文件目录转成树结构（递归）

import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.List;/*** 文件目录转成树结构* @author lph*/
public class FileTreeUtil {/*** 用来存放数据 可存库*/private static List<Tree> list = new ArrayList<>();/*** 因为测试使用，当初主键id来用*/private static Integer id = 0;public static void main(String[] args) {//扫描此文件夹下面的所有文件String filepath = "e://test";//初始化父节点idint parentid = 0;try {file(filepath, parentid);} catch (FileNotFoundException e) {e.printStackTrace();}for (int i = 0; i < list.size(); i++) {Tree tree = list.get(i);System.out.println("id==  " + tree.getId() + "  parentId==  " + tree.getParentId() + "  url==  " + tree.getPath());}}public static void file(String filepath, int parentid) throws FileNotFoundException {File file = new File(filepath);//1.判断文件if (!file.exists()) {throw new FileNotFoundException("文件不存在");}//2.文件if (file.isFile()) {String name = file.getName();String path = file.getAbsolutePath();Tree tree = new Tree(id++, name, path, parentid);list.add(tree);return;}//3.获取文件夹路径下面的所有文件递归调用；if (file.isDirectory()) {String name = file.getName();String path = file.getAbsolutePath();Tree tree = new Tree(id++, name, path, parentid);list.add(tree);String[] list = file.list();for (int i = 0; i < list.length; i++) {String s = list[i];//根据当前文件夹，拼接其下文文件形成新的路径String newFilePath = path + "\\" + s;file(newFilePath, tree.getId());}}}
}class Tree {private Integer id;//文件夹或者文件名称private String name;//全路径,或则部分路径,自己决定private String path;//父节点idprivate Integer parentId;public Tree() {}public Tree(Integer id, String name, String path, Integer parentId) {this.id = id;this.name = name;this.path = path;this.parentId = parentId;}public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getPath() {return path;}public void setPath(String path) {this.path = path;}public Integer getParentId() {return parentId;}public void setParentId(Integer parentId) {this.parentId = parentId;}@Overridepublic String toString() {return "Tree{" +"id=" + id +", name='" + name + '\'' +", path='" + path + '\'' +", parentId=" + parentId +'}';}
}