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等等。

它很好地支持用户/通行证和基于证书的登录，以及所有其他漂亮的SSH2特性。

这是一个简单的远程文件检索SFTP。错误处理留给读者练习:-)

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();

参见http://www.mysamplecode.com/2013/06/sftp-apache-commons-file-download.html

Apache Commons SFTP库

所有示例的公共java属性文件

服务器地址=111.222.333.444

userId = myUserId

密码= myPassword

remoteDirectory =产品/

本地目录=导入/

使用SFTP上传文件到远程服务器

import java.io.File;
import java.io.FileInputStream;
import java.util.Properties;
 
import org.apache.commons.vfs2.FileObject;
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;
 
public class SendMyFiles {
 
 static Properties props;
 
 public static void main(String[] args) {
 
  SendMyFiles sendMyFiles = new SendMyFiles();
  if (args.length < 1)
  {
   System.err.println("Usage: java " + sendMyFiles.getClass().getName()+
     " Properties_file File_To_FTP ");
   System.exit(1);
  }
 
  String propertiesFile = args[0].trim();
  String fileToFTP = args[1].trim();
  sendMyFiles.startFTP(propertiesFile, fileToFTP);
 
 }
 
 public boolean startFTP(String propertiesFilename, String fileToFTP){
 
  props = new Properties();
  StandardFileSystemManager manager = new StandardFileSystemManager();
 
  try {
 
   props.load(new FileInputStream("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();
 
   //check if the file exists
   String filepath = localDirectory +  fileToFTP;
   File file = new File(filepath);
   if (!file.exists())
    throw new RuntimeException("Error. Local file not found");
 
   //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 + fileToFTP;
    
   // Create local file object
   FileObject localFile = manager.resolveFile(file.getAbsolutePath());
 
   // Create remote file object
   FileObject remoteFile = manager.resolveFile(sftpUri, opts);
 
   // Copy local file to sftp server
   remoteFile.copyFrom(localFile, Selectors.SELECT_SELF);
   System.out.println("File upload successful");
 
  }
  catch (Exception ex) {
   ex.printStackTrace();
   return false;
  }
  finally {
   manager.close();
  }
 
  return true;
 }
 
  
}

使用SFTP从远程服务器下载文件

import java.io.File;
import java.io.FileInputStream;
import java.util.Properties;
 
import org.apache.commons.vfs2.FileObject;
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;
 
public class GetMyFiles {
 
 static Properties props;
 
 public static void main(String[] args) {
 
  GetMyFiles getMyFiles = new GetMyFiles();
  if (args.length < 1)
  {
   System.err.println("Usage: java " + getMyFiles.getClass().getName()+
   " Properties_filename File_To_Download ");
   System.exit(1);
  }
 
  String propertiesFilename = args[0].trim();
  String fileToDownload = args[1].trim();
  getMyFiles.startFTP(propertiesFilename, fileToDownload);
    
 }
 
 public boolean startFTP(String propertiesFilename, String fileToDownload){
 
  props = new Properties();
  StandardFileSystemManager manager = new StandardFileSystemManager();
 
  try {
 
   props.load(new FileInputStream("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());
 
   // Create remote file object
   FileObject remoteFile = manager.resolveFile(sftpUri, opts);
 
   // Copy local file to sftp server
   localFile.copyFrom(remoteFile, Selectors.SELECT_SELF);
   System.out.println("File download successful");
 
  }
  catch (Exception ex) {
   ex.printStackTrace();
   return false;
  }
  finally {
   manager.close();
  }
 
  return true;
 }
 
}

使用SFTP删除远程服务器上的文件

import java.io.FileInputStream;
import java.util.Properties;
 
import org.apache.commons.vfs2.FileObject;
import org.apache.commons.vfs2.FileSystemOptions;
import org.apache.commons.vfs2.impl.StandardFileSystemManager;
import org.apache.commons.vfs2.provider.sftp.SftpFileSystemConfigBuilder;
 
public class DeleteRemoteFile {
 
 static Properties props;
 
 public static void main(String[] args) {
 
  DeleteRemoteFile getMyFiles = new DeleteRemoteFile();
  if (args.length < 1)
  {
   System.err.println("Usage: java " + getMyFiles.getClass().getName()+
   " Properties_filename File_To_Delete ");
   System.exit(1);
  }
 
  String propertiesFilename = args[0].trim();
  String fileToDownload = args[1].trim();
  getMyFiles.startFTP(propertiesFilename, fileToDownload);
    
 }
 
 public boolean startFTP(String propertiesFilename, String fileToDownload){
 
  props = new Properties();
  StandardFileSystemManager manager = new StandardFileSystemManager();
 
  try {
 
   props.load(new FileInputStream("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();
    
    
   //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 remote file object
   FileObject remoteFile = manager.resolveFile(sftpUri, opts);
 
   //Check if the file exists
   if(remoteFile.exists()){
    remoteFile.delete();
    System.out.println("File delete successful");
   }
   
  }
  catch (Exception ex) {
   ex.printStackTrace();
   return false;
  }
  finally {
   manager.close();
  }
 
  return true;
 }
 
}

在Jsch之上的一个很好的抽象是Apache common -vfs，它提供了一个虚拟文件系统API，使得SFTP文件的访问和写入几乎是透明的。这对我们来说很有效。

下面是使用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();
        }
    }
}

这就是我想到的解决办法 http://sourceforge.net/projects/sshtools/(为了清晰起见，省略了大多数错误处理)。这是我博客的节选

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();

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);