org.apache.commons.vfs.FileSystemException：无法连接到端口 21 上 "sftp://username:***@114.XX.XX.XX/" 的 SFTP 服务器

Question

我可以使用以下凭据从 WinSCP 访问 SFTP

• 服务器地址=114.XX.XX.XX
• userId=orafusion
• 密码=OraP!ss!123
• remoteDirectory=测试数据/
• 端口=21

使用的库：

• commons-vfs2-2.0.jar
• jsch-0.1.50.jar

尝试使用 Java 以编程方式连接时出现以下错误。当我浏览 google 查找错误时，我所能得到的只是特殊字符！用于密码。因此，使用 UriParser.encode(sftpuri) 可以解决问题，但不幸的是它没有帮助。

org.apache.commons.vfs.FileSystemException: Could not connect to SFTP server at "sftp://orafusion:***@114.XX.XX.XX/".
    at org.apache.commons.vfs.provider.sftp.SftpFileProvider.doCreateFileSystem(SftpFileProvider.java:99)
    at org.apache.commons.vfs.provider.AbstractOriginatingFileProvider.getFileSystem(AbstractOriginatingFileProvider.java:103)
    at org.apache.commons.vfs.provider.AbstractOriginatingFileProvider.findFile(AbstractOriginatingFileProvider.java:82)
    at org.apache.commons.vfs.provider.AbstractOriginatingFileProvider.findFile(AbstractOriginatingFileProvider.java:66)
    at org.apache.commons.vfs.impl.DefaultFileSystemManager.resolveFile(DefaultFileSystemManager.java:692)
    at org.apache.commons.vfs.impl.DefaultFileSystemManager.resolveFile(DefaultFileSystemManager.java:620)
    at com.gfi.oracle.penalty.view.bean.GetMyFiles.startFTP(GetMyFiles.java:76)
    at com.gfi.oracle.penalty.view.bean.GetMyFiles.main(GetMyFiles.java:38)

Caused by: org.apache.commons.vfs.FileSystemException: Could not connect to SFTP server at "114.XX.XX.XX".
    at org.apache.commons.vfs.provider.sftp.SftpClientFactory.createConnection(SftpClientFactory.java:214)
    at org.apache.commons.vfs.provider.sftp.SftpFileProvider.doCreateFileSystem(SftpFileProvider.java:90)
    ... 7 more

Caused by: com.jcraft.jsch.JSchException: Session.connect: java.net.SocketTimeoutException: Read timed out
    at com.jcraft.jsch.Session.connect(Session.java:495)
    at com.jcraft.jsch.Session.connect(Session.java:150)
    at org.apache.commons.vfs.provider.sftp.SftpClientFactory.createConnection(SftpClientFactory.java:210)
    ... 8 more

下面是我用于从 SFTP 下载文件的代码。

博客参考：https://www.mysamplecode.com/2013/06/sftp-apache-commons-file-download.html

UriParser.encode(sftpUri) 的输出。我可以推断这里没有附加 PORT

sftp://orafusion:OraP!ss!123@114.XX.XX.XX/TestData/TestFile.txt

我在下面的代码行出错

FileObject remoteFile = manager.resolveFile(UriParser.encode(sftpUri), opts);

---

props = new Properties();
StandardFileSystemManager manager = new StandardFileSystemManager();

props.load(new FileInputStream("D:\common.properties")); // + propertiesFilename));
String serverAddress = props.getProperty("serverAddress").trim();
String userId = props.getProperty("userId").trim();
String password = props.getProperty("password").trim();
String remoteDirectory = props.getProperty("remoteDirectory").trim();
String localDirectory = props.getProperty("localDirectory").trim();

//Initializes the file manager
manager.init();

//Setup our SFTP configuration
FileSystemOptions opts = new FileSystemOptions();
SftpFileSystemConfigBuilder.getInstance().setStrictHostKeyChecking(opts, "no");
SftpFileSystemConfigBuilder.getInstance().setUserDirIsRoot(opts, true);
SftpFileSystemConfigBuilder.getInstance().setTimeout(opts, 10000);

//Create the SFTP URI using the host name, userid, password,  remote path and file name
String sftpUri = "sftp://" + userId + ":" + password +  "@" + serverAddress + "/" +
     remoteDirectory + fileToDownload;

// Create local file object
String filepath = localDirectory + fileToDownload;
File file = new File(filepath);
FileObject localFile = manager.resolveFile(file.getAbsolutePath());

System.out.println("sftp uri : " + UriParser.encode(sftpUri));
// Create remote file object
FileObject remoteFile = manager.resolveFile(UriParser.encode(sftpUri), opts);

// Copy local file to sftp serverF
localFile.copyFrom(remoteFile, Selectors.SELECT_SELF);
System.out.println("File download successful");

Answer 1

您在 WinSCP 中使用的是 FTP，而不是 SFTP。这是两个完全不兼容的协议。

或者可能是 FTP 的加密变体，即 FTPS（FTP 在 TLS/SSL 之上）——什么可能导致您与 S[=22 混淆=].

将 URL 中的 sftp:// 替换为 ftp:// 或 ftps://。
参见 https://commons.apache.org/proper/commons-vfs/filesystems.html#FTP

Answer 2

我仅在部署应用程序时收到此错误。在 IDE 本地，它工作得很好。有什么想法吗？

    fun copyCsvToSFTP(fileToSFTP: String) {
    val manager = StandardFileSystemManager()
    try {
        val file = File(fileToSFTP)
        if (!file.exists()) throw FileNotFoundException("Error: Local file not found")

        // Initializes the file manager
        manager.init()

        // Setup SFTP configuration
        val options = FileSystemOptions()
        setUpSftpConfiguration(options)

        //Create the sftpURI using the host name, userid, password, remote path and file name
        val sftpUri: String = formatUri(
            userId,
            password,
            serverAddress,
            sftpDirectory,
            fileToSFTP
        )

        // Create local file object
        val localFile: FileObject = manager.resolveFile(file.absolutePath, options)

        // Create remote file object
        val remoteFile: FileObject = manager.resolveFile(sftpUri, options)

        // Copy local file to sftp server
        remoteFile.copyFrom(localFile, Selectors.SELECT_SELF)
    } catch (ex: Exception) {
        ex.printStackTrace()
    } finally {
        manager.close()
    }
}


@Throws(FileSystemException::class)
fun setUpSftpConfiguration(options: FileSystemOptions) {
    SftpFileSystemConfigBuilder.getInstance().setStrictHostKeyChecking(options, "no")
    SftpFileSystemConfigBuilder.getInstance().setUserDirIsRoot(options, false)
    SftpFileSystemConfigBuilder.getInstance()
        .setSessionTimeout(options, Duration.ofMillis(60000))
} 



private fun formatUri(
        userId: String?, password: String?, serverAddress: String?,
        directory: String, fileName: String
    ): String {
        return java.lang.String.format(
            SFTP_URI_FORMAT,
            URLEncoder.encode(userId, "UTF-8"),
            URLEncoder.encode(password, "UTF-8"),
            URLEncoder.encode(serverAddress, "UTF-8"),
            URLEncoder.encode(directory, "UTF-8"),
            URLEncoder.encode(fileName, "UTF-8")
        )
    }