Java使用FTP连接到NAS读取文件信息，并将文件信息变成单向树形结构设置到对象中

检测NAS是否启用的FTP连接模式

在这里插入图片描述
如果这里不启用会出现下面错误提示：
MalformedServerReplyException: Could not parse response code. Server Reply: SSH-2.0-OpenS

使用依赖

        <dependency>
            <groupId>commons-net</groupId>
            <artifactId>commons-net</artifactId>
            <version>3.8.0</version>
        </dependency>
         <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.8.1</version>
        </dependency>

单向树形对象

public class NasFileInfoModel {
    //上级目录
    private String parentPath;
    //当前目录
    private String path;
    //文件或文件夹名称
    private String name;
    //下级文件
    private List<NasFileInfoModel> childDir = new ArrayList<>();

    public NasFileInfoModel(String path, String name) {
        this.path = path;
        this.name = name;
    }

    public NasFileInfoModel() {
    }

    public String getParentPath() {
        return parentPath;
    }

    public void setParentPath(String parentPath) {
        this.parentPath = parentPath;
    }

    public String getPath() {
        return path;
    }

    public void setPath(String path) {
        this.path = path;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public List<NasFileInfoModel> getChildDir() {
        return childDir;
    }

    public void setChildDir(List<NasFileInfoModel> childDir) {
        this.childDir = childDir;
    }

    public void addChildDir(NasFileInfoModel childDir) {
        this.childDir.add(childDir);
    }

    @Override
    public String toString() {
        return JSONObject.toJSONString(this);
    }
}

连接与赋值方法

    @Test
    public void nasFileTest() {
        String path = "/图片素材";//指定地址目录，不指定则默认/目录
        //实例化服务访问对象
        try (Ftp ftp = new Ftp("192.168.110.69", 21, "子龙", "********.")) {
            FTPClient client = ftp.getClient();
            //将当前目录信息设置到对象中，作为第一个节点
            NasFileInfoModel nasFile = new NasFileInfoModel(path, path.replace("/", ""));
            //获取目录节点的下级文件信息
            List<NasFileInfoModel> nasFileInfoModels = childFileList(nasFile, client);
            nasFile.setChildDir(nasFileInfoModels);
            System.out.println("nasFile = " + nasFile);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
    /**
     * 获取文件目录的下级文件信息
     *
     * @param parentFile 需要获取下级目录信息的，父节点目录
     * @param client     tfp连接
     * @return 传入入节点文件的下级目录集合
     */
    public List<NasFileInfoModel> childFileList(NasFileInfoModel parentFile, FTPClient client) throws IOException {
        String path = parentFile.getPath();//父目录的路径
        List<NasFileInfoModel> fileList = new ArrayList<>();
        FTPFile[] ftpFiles = client.listFiles(path);
        for (FTPFile ftpFile : ftpFiles) {
            //实例化文件信息对象，并且设置文件路径与文件名称
            NasFileInfoModel file = new NasFileInfoModel(path + "/" + ftpFile.getName(), ftpFile.getName());
            file.setParentPath(path);//设置父目录地址
            if (ftpFile.isDirectory()) {
                List<NasFileInfoModel> nasFileInfoModels = childFileList(file, client);
                file.setChildDir(nasFileInfoModels);
            }
            fileList.add(file);
        }
        return fileList;
    }