Java 如何通过 SFTP 从服务器检索文件？
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How to retrieve a file from a server via SFTP?
提问by David Hayes
I'm trying to retrieve a file from a server using SFTP (as opposed to FTPS) using Java. How can I do this?
我正在尝试使用 Java 从使用 SFTP（而不是 FTPS）的服务器检索文件。我怎样才能做到这一点？
采纳答案by Cheekysoft
Another option is to consider looking at the JSch library. JSch seems to be the preferred library for a few large open source projects, including Eclipse, Ant and Apache Commons HttpClient, amongst others.
另一种选择是考虑查看JSch 库。JSch 似乎是一些大型开源项目的首选库，包括 Eclipse、Ant 和 Apache Commons HttpClient 等。
It supports both user/pass and certificate-based logins nicely, as well as all a whole host of other yummy SSH2 features.
它很好地支持用户/密码和基于证书的登录，以及所有其他美味的 SSH2 功能。
Here's a simple remote file retrieve over SFTP. Error handling is left as an exercise for the reader :-)
这是通过 SFTP 检索的简单远程文件。错误处理留给读者作为练习:-)
JSch jsch = new JSch();
String knownHostsFilename = "/home/username/.ssh/known_hosts";
jsch.setKnownHosts( knownHostsFilename );
Session session = jsch.getSession( "remote-username", "remote-host" );
{
// "interactive" version
// can selectively update specified known_hosts file
// need to implement UserInfo interface
// MyUserInfo is a swing implementation provided in
// examples/Sftp.java in the JSch dist
UserInfo ui = new MyUserInfo();
session.setUserInfo(ui);
// OR non-interactive version. Relies in host key being in known-hosts file
session.setPassword( "remote-password" );
}
session.connect();
Channel channel = session.openChannel( "sftp" );
channel.connect();
ChannelSftp sftpChannel = (ChannelSftp) channel;
sftpChannel.get("remote-file", "local-file" );
// OR
InputStream in = sftpChannel.get( "remote-file" );
// process inputstream as needed
sftpChannel.exit();
session.disconnect();
回答by David Hayes
This was the solution I came up with http://sourceforge.net/projects/sshtools/(most error handling omitted for clarity). This is an excerpt from my blog
这是我想出的解决方案 http://sourceforge.net/projects/sshtools/（为了清楚起见省略了大多数错误处理）。这是我博客的摘录
SshClient ssh = new SshClient();
ssh.connect(host, port);
//Authenticate
PasswordAuthenticationClient passwordAuthenticationClient = new PasswordAuthenticationClient();
passwordAuthenticationClient.setUsername(userName);
passwordAuthenticationClient.setPassword(password);
int result = ssh.authenticate(passwordAuthenticationClient);
if(result != AuthenticationProtocolState.COMPLETE){
throw new SFTPException("Login to " + host + ":" + port + " " + userName + "/" + password + " failed");
}
//Open the SFTP channel
SftpClient client = ssh.openSftpClient();
//Send the file
client.put(filePath);
//disconnect
client.quit();
ssh.disconnect();
回答by Boris Terzic
A nice abstraction on top of Jsch is Apache commons-vfswhich offers a virtual filesystem API that makes accessing and writing SFTP files almost transparent. Worked well for us.
在 Jsch 之上的一个很好的抽象是 Apache commons-vfs，它提供了一个虚拟文件系统 API，使访问和写入 SFTP 文件几乎是透明的。为我们工作得很好。
回答by Brian Clapper
回答by Brian Clapper
You also have JFileUpload with SFTP add-on (Java too): http://www.jfileupload.com/products/sftp/index.html
您还有带有 SFTP 附加组件的 JFileUpload（也是 Java）：http://www.jfileupload.com/products/sftp/index.html
回答by Bruce Blackshaw
Try edtFTPj/PRO, a mature, robust SFTP client library that supports connection pools and asynchronous operations. Also supports FTP and FTPS so all bases for secure file transfer are covered.
试试edtFTPj/PRO，这是一个成熟、强大的 SFTP 客户端库，支持连接池和异步操作。还支持 FTP 和 FTPS，因此涵盖了安全文件传输的所有基础。
回答by Bruce Blackshaw
I use this SFTP API called Zehon, it's great, so easy to use with a lot of sample code. Here is the site http://www.zehon.com
我使用了这个名为 Zehon 的 SFTP API，它很棒，非常容易使用，有很多示例代码。这是网站http://www.zehon.com
回答by shikhar
hierynomus/sshjhas a complete implementation of SFTP version 3 (what OpenSSH implements)
hierynomus/sshj有 SFTP 版本 3 的完整实现（OpenSSH 实现的）
Example code from SFTPUpload.java
来自SFTPUpload.java 的示例代码
package net.schmizz.sshj.examples;
import net.schmizz.sshj.SSHClient;
import net.schmizz.sshj.sftp.SFTPClient;
import net.schmizz.sshj.xfer.FileSystemFile;
import java.io.File;
import java.io.IOException;
/** This example demonstrates uploading of a file over SFTP to the SSH server. */
public class SFTPUpload {
public static void main(String[] args)
throws IOException {
final SSHClient ssh = new SSHClient();
ssh.loadKnownHosts();
ssh.connect("localhost");
try {
ssh.authPublickey(System.getProperty("user.name"));
final String src = System.getProperty("user.home") + File.separator + "test_file";
final SFTPClient sftp = ssh.newSFTPClient();
try {
sftp.put(new FileSystemFile(src), "/tmp");
} finally {
sftp.close();
}
} finally {
ssh.disconnect();
}
}
}
回答by Chris J
Below is an example using Apache Common VFS:
下面是一个使用 Apache Common VFS 的例子：
FileSystemOptions fsOptions = new FileSystemOptions();
SftpFileSystemConfigBuilder.getInstance().setStrictHostKeyChecking(fsOptions, "no");
FileSystemManager fsManager = VFS.getManager();
String uri = "sftp://user:password@host:port/absolute-path";
FileObject fo = fsManager.resolveFile(uri, fsOptions);
回答by Iraklis
Here is the complete source code of an example using JSchwithout having to worry about the ssh key checking.
这是使用JSch的示例的完整源代码，无需担心 ssh 密钥检查。
import com.jcraft.jsch.*;
public class TestJSch {
public static void main(String args[]) {
JSch jsch = new JSch();
Session session = null;
try {
session = jsch.getSession("username", "127.0.0.1", 22);
session.setConfig("StrictHostKeyChecking", "no");
session.setPassword("password");
session.connect();
Channel channel = session.openChannel("sftp");
channel.connect();
ChannelSftp sftpChannel = (ChannelSftp) channel;
sftpChannel.get("remotefile.txt", "localfile.txt");
sftpChannel.exit();
session.disconnect();
} catch (JSchException e) {
e.printStackTrace();
} catch (SftpException e) {
e.printStackTrace();
}
}
}
