/**
  * 獲取連接
  * @param ip 跳轉(zhuǎn)機host
  * @param userName 跳轉(zhuǎn)機用戶名
  * @param pwd 跳轉(zhuǎn)機密碼
  * @param port 跳轉(zhuǎn)機端口
  * @return ChannelSftp 返回值
  * @throws JSchException 連接異常
  */
 public static ChannelSftp connect(String ip, String userName, String pwd, int port) throws JSchException
 {
  if (port <= 0)
  {
   port = PORT;
  }
  Session sshSession = null;
  JSch jsch = new JSch();
  sshSession = jsch.getSession(userName, ip, port);
  
  sshSession.setPassword(pwd);
  Properties sshConfig = new Properties();
  sshConfig.put("StrictHostKeyChecking", "no");
  sshConfig.put("PreferredAuthentications",
    "password,keyboard-interactive");
  sshSession.setConfig(sshConfig);
  
  
  sshSession.connect(TMOUT);//可設置超時時間 
  //此處開始為端口映射到本地的部分
  sshSession.setPortForwardingL(本地端口, 目標節(jié)點地址, 22);
  //完成上訴映射之后，即可通過本地端口連接了
  Session session = jsch.getSession("目標服務用戶名", "127.0.0.1",本地端口);
  Properties remoteCfg = new Properties();
  remoteCfg.put("StrictHostKeyChecking", "no");
  remoteCfg.put("PreferredAuthentications",
    "password,keyboard-interactive");
  session.setConfig(remoteCfg);
  session.setPassword("目標服務密碼");
  session.connect();
  //后續(xù)如何可自行改變，網(wǎng)上運用很多
  Channel channel = (Channel) session.openChannel("sftp");//創(chuàng)建sftp通信通道 
  channel.connect();
  ChannelSftp sftp = (ChannelSftp) channel;
  
  return sftp;
 }