我尝试将文件从一个远程服务器上传到另一个远程server。我使用下面的代码，但我必须面对；org.apache.commons.vfs2.FileSystemException"；。
**例外情况：**
org.apache.commons.fs2.FileSystemException：找不到URI为"的文件；sftp://root:***@111.222.333.444\root\home\tempfileholder\sample.txt"；因为它是一个相对路径，并且没有提供基URI。
此外，我不明白他们作为基础URL的希望是什么
请给我溶液。
**代码：**
import java.io.File;
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;
/**
* The class SFTPUtil containing uploading, downloading, checking if file exists
* and deleting functionality using Apache Commons VFS (Virtual File System)
* Library
*
* @author Kavindu
*
*/
public class SFTPUtility {
public static void main(String[] args) {
String hostName = "111.222.333.444";
String username = "root";
String password = "kkTTpp@JacobWPST";
String localFilePath = ""C:"+File.separator+"Users"+File.separator+"kavindu"+File.separator+"Desktop"+File.separator+"temp"+File.separator+"tempdetails.txt";
String remoteFilePath = "/root/home/tempfileholder/sample.txt";
upload(hostName, username, password, localFilePath, 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
*/
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 - Kavindu.
*/
// 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();
}
}
/**
* 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) {
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;
}
}
正如文档所说的
By default, the path is relative to the user's home directory. This can be changed with:
FtpFileSystemConfigBuilder.getInstance().setUserDirIsRoot(options, false);
因此，在您的情况下，是sftp://root:***@111.222.333.444hometempfileholdersample.txt映射到linux主机中的/root/home/tempfileholder/sample.txt。
我还投入了大量时间使用Apachevfs2-lib连接到SFTP服务器并下载文件。最后我切换到sshj，它看起来更容易使用：
Maven依赖：
<dependency>
<groupId>com.hierynomus</groupId>
<artifactId>sshj</artifactId>
<version>0.31.0</version>
</dependency>
示例下载远程文件：
@Test
public void testConnection() {
try {
final SSHClient ssh = new SSHClient();
ssh.addHostKeyVerifier(new PromiscuousVerifier());
try {
ssh.loadKnownHosts();
ssh.connect(ftpServer, ftpPort);
ssh.authPassword(ftpUser, ftpPassword);
SFTPClient sftpClient = ssh.newSFTPClient();
String localDir="/tmp/";
sftpClient.get(ftpFullPath, localDir + "sshjFile.txt");
sftpClient.close();
} finally {
ssh.disconnect();
}
} catch (IOException e) {
Assert.fail(e.getMessage());
e.printStackTrace();
}
}
要上传文件，只需使用put方法而不是get。
<!--Supported protocols include: Echo, Finger, FTP, NNTP, NTP, POP3(S), SMTP(S), Telnet, Whois-->
<dependency>
<groupId>commons-net</groupId>
<artifactId>commons-net</artifactId>
</dependency>
将此添加到您的pom 中