java将本地文件目录转成树结构（递归）

「爱情、让人受尽委屈。」 2022-09-11 10:28 198阅读 0赞

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id
            int 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id
        private 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;
        }
    
        @Override
        public String toString() {
            return "Tree{" +
                    "id=" + id +
                    ", name='" + name + '\'' +
                    ", path='" + path + '\'' +
                    ", parentId=" + parentId +
                    '}';
        }
    }