com.jcraft
jsch
0.1.54

//利用ChannelSftp 类中的方法 可以实现SFTP操作
private static Logger log = Logger.getLogger(SFTPUtils.class);

    private String host;//服务器连接ip
    private String username;//用户名
    private String password;//密码
    private int port = 22;//端口号
    private ChannelSftp sftp = null;
    private Session sshSession = null;

    public SFTPUtils(){}

    public SFTPUtils(String host, int port, String username, String password)
    {
        this.host = host;
        this.username = username;
        this.password = password;
        this.port = port;
    }

    public SFTPUtils(String host, String username, String password)
    {
        this.host = host;
        this.username = username;
        this.password = password;
    }

    /**
     * 通过SFTP连接服务器
     */
    public void connect()
    {
        try
        {
            JSch jsch = new JSch();
            jsch.getSession(username, host, port);
            sshSession = jsch.getSession(username, host, port);
            if (log.isInfoEnabled())
            {
                log.info("Session created.");
            }
            sshSession.setPassword(password);
            Properties sshConfig = new Properties();
            sshConfig.put("StrictHostKeyChecking", "no");
            sshSession.setConfig(sshConfig);
            sshSession.connect();
            if (log.isInfoEnabled())
            {
                log.info("Session connected.");
            }
            Channel channel = sshSession.openChannel("sftp");
            channel.connect();
            if (log.isInfoEnabled())
            {
                log.info("Opening Channel.");
            }
            sftp = (ChannelSftp) channel;
            if (log.isInfoEnabled())
            {
                log.info("Connected to " + host + ".");
            }
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }

    /**
     * 关闭连接
     */
    public void disconnect()
    {
        if (this.sftp != null)
        {
            if (this.sftp.isConnected())
            {
                this.sftp.disconnect();
                if (log.isInfoEnabled())
                {
                    log.info("sftp is closed already");
                }
            }
        }
        if (this.sshSession != null)
        {
            if (this.sshSession.isConnected())
            {
                this.sshSession.disconnect();
                if (log.isInfoEnabled())
                {
                    log.info("sshSession is closed already");
                }
            }
        }
    }