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使用Jsch可以很容易地實現sftp文件上傳。具體代碼如下：

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();
?}

?/**
? * 要上傳的文件必須包含完整的路徑
? *
? */
?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)) {
?????// 當前沒有要上傳的文件
?????System.out.println("當前沒有要上傳的文件");
?????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();
?}
}

附件中有一個Jsch包，和一個mini-sftp-server。