java - 使用 Apache VFS2 复制文件夹导致错误 Caused by : org. apache.commons.vfs2.FileSystemException: Expecting/to follow the hostname in URI

Question

我尝试使用 apache VFS2 将文件夹从网络复制到本地系统。我在他们的 pom.xml 中添加了来自 Maven 的所有依赖项。但我仍然收到此错误“Caused by: org.apache.commons.vfs2.FileSystemException:

期望/跟随 URI 中的主机名“由:org.apache.commons.vfs2.FileSystemException:期望/跟随 URI 中的主机名”sftp://user:*****@network/opt/file.txt"**

我搜索了 SO 站点、stackexchange、 super 用户并找到了这个问题主题，建议的补救措施是缺少 jar。有人请对这个问题有所了解，请提供我要用 intellij 下载的 jar 的确切列表。

我正在使用此代码。

import org.apache.commons.vfs2.FileObject;
import org.apache.commons.vfs2.FileSystemException;
import org.apache.commons.vfs2.FileSystemOptions;
import org.apache.commons.vfs2.Selectors;
import org.apache.commons.vfs2.impl.StandardFileSystemManager;
import org.apache.commons.vfs2.provider.sftp.SftpFileSystemConfigBuilder;

import java.io.File;

/**
 * The class SFTPUtil containing uploading, downloading, checking if file exists
 * and deleting functionality using Apache Commons VFS (Virtual File System)
 * Library
 *
 * @author Ashok
 *
 */
public class SFTPUtility {

    public static void main(String[] args) {
        String hostName = "10.2.55.66";
        String username = "user";
        String password = "password@network";

        String localFilePath = "/opt/FakeFile.txt";
        String remoteFilePath = "/opt/file.txt";
        String remoteTempFilePath = "/tmp";

        //upload(hostName, username, password, localFilePath, remoteFilePath);
        exist(hostName, username, password, remoteFilePath);
        download(hostName, username, password, localFilePath,remoteFilePath);
        //move(hostName, username, password, remoteFilePath, remoteTempFilePath);
        //delete(hostName, username, password, remoteFilePath);
    }

    /**
     * Method to upload a file in Remote server
     *
     * @param hostName
     *            HostName of the server
     * @param username
     *            UserName to login
     * @param password
     *            Password to login
     * @param localFilePath
     *            LocalFilePath. Should contain the entire local file path -
     *            Directory and Filename with \\ as separator
     * @param remoteFilePath
     *            remoteFilePath. Should contain the entire remote file path -
     *            Directory and Filename with / as separator
     */
    public static void upload(String hostName, String username, String password, String localFilePath, String remoteFilePath) {

        File file = new File(localFilePath);
        if (!file.exists())
            throw new RuntimeException("Error. Local file not found");

        StandardFileSystemManager manager = new StandardFileSystemManager();

        try {
            manager.init();

            // Create local file object
            FileObject localFile = manager.resolveFile(file.getAbsolutePath());

            // Create remote file object
            FileObject remoteFile = manager.resolveFile(createConnectionString(hostName, username, password, remoteFilePath), createDefaultOptions());
            /*
             * use createDefaultOptions() in place of fsOptions for all default
             * options - Ashok.
             */

            // Copy local file to sftp server
            remoteFile.copyFrom(localFile, Selectors.SELECT_SELF);

            System.out.println("File upload success");
        } catch (Exception e) {
            throw new RuntimeException(e);
        } finally {
            manager.close();
        }
    }

    public static boolean move(String hostName, String username, String password, String remoteSrcFilePath, String remoteDestFilePath){
        StandardFileSystemManager manager = new StandardFileSystemManager();

        try {
            manager.init();

            // Create remote object
            FileObject remoteFile = manager.resolveFile(createConnectionString(hostName, username, password, remoteSrcFilePath), createDefaultOptions());
            FileObject remoteDestFile = manager.resolveFile(createConnectionString(hostName, username, password, remoteDestFilePath), createDefaultOptions());

            if (remoteFile.exists()) {
                remoteFile.moveTo(remoteDestFile);;
                System.out.println("Move remote file success");
                return true;
            }
            else{
                System.out.println("Source file doesn't exist");
                return false;
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        } finally {
            manager.close();
        }
    }

    /**
     * Method to download the file from remote server location
     *
     * @param hostName
     *            HostName of the server
     * @param username
     *            UserName to login
     * @param password
     *            Password to login
     * @param localFilePath
     *            LocalFilePath. Should contain the entire local file path -
     *            Directory and Filename with \\ as separator
     * @param remoteFilePath
     *            remoteFilePath. Should contain the entire remote file path -
     *            Directory and Filename with / as separator
     */
    public static void download(String hostName, String username, String password, String localFilePath, String remoteFilePath) {

        StandardFileSystemManager manager = new StandardFileSystemManager();

        try {
            manager.init();

            // Append _downlaod_from_sftp to the given file name.
            //String downloadFilePath = localFilePath.substring(0, localFilePath.lastIndexOf(".")) + "_downlaod_from_sftp" + localFilePath.substring(localFilePath.lastIndexOf("."), localFilePath.length());

            // Create local file object. Change location if necessary for new downloadFilePath
            FileObject localFile = manager.resolveFile(localFilePath);

            // Create remote file object
            FileObject remoteFile = manager.resolveFile(createConnectionString(hostName, username, password, remoteFilePath), createDefaultOptions());

            // Copy local file to sftp server
            localFile.copyFrom(remoteFile, Selectors.SELECT_SELF);

            System.out.println("File download success");
        } catch (Exception e) {
            throw new RuntimeException(e);
        } finally {
            manager.close();
        }
    }

    /**
     * Method to delete the specified file from the remote system
     *
     * @param hostName
     *            HostName of the server
     * @param username
     *            UserName to login
     * @param password
     *            Password to login
     * @param localFilePath
     *            LocalFilePath. Should contain the entire local file path -
     *            Directory and Filename with \\ as separator
     * @param remoteFilePath
     *            remoteFilePath. Should contain the entire remote file path -
     *            Directory and Filename with / as separator
     */
    public static void delete(String hostName, String username, String password, String remoteFilePath) {
        StandardFileSystemManager manager = new StandardFileSystemManager();

        try {
            manager.init();

            // Create remote object
            FileObject remoteFile = manager.resolveFile(createConnectionString(hostName, username, password, remoteFilePath), createDefaultOptions());

            if (remoteFile.exists()) {
                remoteFile.delete();
                System.out.println("Delete remote file success");
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        } finally {
            manager.close();
        }
    }

    // Check remote file is exist function:
    /**
     * Method to check if the remote file exists in the specified remote
     * location
     *
     * @param hostName
     *            HostName of the server
     * @param username
     *            UserName to login
     * @param password
     *            Password to login
     * @param remoteFilePath
     *            remoteFilePath. Should contain the entire remote file path -
     *            Directory and Filename with / as separator
     * @return Returns if the file exists in the specified remote location
     */
    public static boolean exist(String hostName, String username, String password, String remoteFilePath) {
        StandardFileSystemManager manager = new StandardFileSystemManager();

        try {
            manager.init();

            // Create remote object
            FileObject remoteFile = manager.resolveFile(createConnectionString(hostName, username, password, remoteFilePath), createDefaultOptions());

            System.out.println("File exist: " + remoteFile.exists());

            return remoteFile.exists();
        } catch (Exception e) {
            throw new RuntimeException(e);
        } finally {
            manager.close();
        }
    }

    /**
     * Generates SFTP URL connection String
     *
     * @param hostName
     *            HostName of the server
     * @param username
     *            UserName to login
     * @param password
     *            Password to login
     * @param remoteFilePath
     *            remoteFilePath. Should contain the entire remote file path -
     *            Directory and Filename with / as separator
     * @return concatenated SFTP URL string
     */
    public static String createConnectionString(String hostName, String username, String password, String remoteFilePath) {
        if(remoteFilePath.startsWith("/")||remoteFilePath.startsWith("\\"))
                remoteFilePath=remoteFilePath.substring(1);
        return "sftp://" + username + ":" + password + "@" + hostName + "/" + remoteFilePath;
    }

    /**
     * Method to setup default SFTP config
     *
     * @return the FileSystemOptions object containing the specified
     *         configuration options
     * @throws FileSystemException
     */
    public static FileSystemOptions createDefaultOptions() throws FileSystemException {
        // Create SFTP options
        FileSystemOptions opts = new FileSystemOptions();

        // SSH Key checking
        SftpFileSystemConfigBuilder.getInstance().setStrictHostKeyChecking(opts, "no");

        /*
         * Using the following line will cause VFS to choose File System's Root
         * as VFS's root. If I wanted to use User's home as VFS's root then set
         * 2nd method parameter to "true"
         */
        // Root directory set to user home
        SftpFileSystemConfigBuilder.getInstance().setUserDirIsRoot(opts, false);

        // Timeout is count by Milliseconds
        SftpFileSystemConfigBuilder.getInstance().setTimeout(opts, 10000);

        return opts;
    }
}

Answer 1

请指定文件位置如下并检查

如果是本地文件，

file:///home/someuser/somedir       
file:///C:/DocumentsandSettings     
file://///somehost/test/text.xml

或者如果是ftp，

> ftp://myusername:mypassword@hostname/test/test.tar.gz