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使用Jsch可以很容易地实现sftp文件上传。具体代码如下：

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
import java.util.Vector;

import com.jcraft.jsch.Channel;
import com.jcraft.jsch.ChannelSftp;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.Session;
import com.jcraft.jsch.SftpException;

public class SftpHelper extends Thread {

private String host;
 private String username;
 private String password;
 private String location;
 private int port;
 private String knowHosts;

private String osName;

private List<String> filenames = new ArrayList<String>();

public SftpHelper(String host, String username, String password, int port) {
  this(host, username, password, port, "");
 }

public SftpHelper(String host, String username, String password, int port,
   String location) {
  this.host = host;
  this.username = username;
  this.password = password;
  this.port = port;
  osName = System.getProperty("os.name");
  System.out.println(osName);
  if (osName.toUpperCase().indexOf("WINDOWS") > -1) {
   //Windows OS
  } else {
   //Linux OS
  }
  this.location = location;
 }

public void addFilename(String filename) {
  filenames.add(filename);
 }

public void setFilenames(List<String> filenames) {
  this.filenames = filenames;
 }

public void run() {
  upload();
 }

/**
  * 要上传的文件必须包含完整的路径
  *
  */
 public boolean upload() {
  if (filenames.size() == 0)
   return false;
  Session session;
  Channel channel;
  JSch jsch = new JSch();
  try {
   session = jsch.getSession(username, host, port);
   session.setPassword(password);
   Properties prop = new Properties();
   prop.setProperty("StrictHostKeyChecking", "no");// StrictHostKeyChecking:
   // ask | yes | no
   session.setConfig(prop);
   session.connect();
   channel = session.openChannel("sftp");
   channel.connect();
   ChannelSftp c = (ChannelSftp) channel;
   c.cd(location);

InputStream in = null;
   OutputStream out = null;
   for (int i = 0; i < filenames.size(); i++) {
    String filename = filenames.get(i);
    if (filename == null || "".equals(filename)) {
     // 当前没有要上传的文件
     System.out.println("当前没有要上传的文件");
     continue;
    }
    int idx = filename.lastIndexOf(File.separator);

String uploadname = filename.substring(idx == -1 ? 0 : idx + 1);
    System.out.println(uploadname);
    out = c.put(uploadname);

sleep(5000);

in = new FileInputStream(filename);

byte[] b = new byte[1024];
    int n;
    while ((n = in.read(b)) != -1) {
     out.write(b);
    }
   }
   out.flush();
   out.close();
   in.close();
   c.disconnect();
   session.disconnect();
   sleep(500);
   return true;
  } catch (JSchException e) {
   System.out.println("JSchException");
   e.printStackTrace();
  } catch (SftpException e) {
   System.out.println("SftpException");
   e.printStackTrace();
  } catch (IOException e) {
   System.out.println("IOException");
   e.printStackTrace();
  } catch (InterruptedException e) {
   System.out.println("InterruptedException");
   e.printStackTrace();
  }
  return false;
 }

public static void main(String[] args) {
  String username = "kary";
  String host = "localhost";
  int port = 22;
  String password = "123";
  String path = "/sftphelper/";
  SftpHelper helper = new SftpHelper(host, username, password, port, path);
  helper.addFilename("D:\\a.txt");
  helper.addFilename("D:\\b.txt");
  helper.start();
 }
}

附件中有一个Jsch包，和一个mini-sftp-server。