/**
  * 將文件上傳到服務器
  * 
  * @param filePath
  *   文件路徑
  * @param channelSftp
  *   channelSftp對象
  * @return
  */
 public static boolean uploadFile(String filePath, ChannelSftp channelSftp) {
  OutputStream outstream = null;
  InputStream instream = null;
  boolean successFlag = false;
  try {
   File isfile = new File(filePath);
   if (isfile.isFile()) {
    outstream = channelSftp.put(isfile.getName());
    File file = new File(filePath);
    if (file.exists()) {
     instream = new FileInputStream(file);
     byte b[] = new byte[1024];
     int n;
     while ((n = instream.read(b)) != -1) {
      outstream.write(b, 0, n);
     }
     outstream.flush();
    }
    successFlag = true;
   }
  } catch (Exception e) {
   e.printStackTrace();
  } finally {
   try {
    if (instream != null) {
     instream.close();
    }
    if (outstream != null) {
     outstream.close();
    }
   } catch (IOException e) {
    e.printStackTrace();
   }
  }
  return successFlag;
 }
 private static Session initJschSession()
   throws JSchException {
  int ftpPort = 0;
  String ftpHost = "";
  String port = "00"; //sftp的端口號
  String ftpUserName = ""; //用戶名
  String ftpPassword = ""; //鏈接的密碼
  String privateKey = ""; //
  String passphrase = "";
  if (port != null && !port.equals("")) {
   ftpPort = Integer.valueOf(port);
  }
  JSch jsch = new JSch(); // 創建JSch對象
  if (StringUtils.isNotBlank(privateKey)
    && StringUtils.isNotBlank(passphrase)) {
   jsch.addIdentity(privateKey, passphrase);
  }
  if (StringUtils.isNotBlank(privateKey)
    && StringUtils.isBlank(passphrase)) {
   jsch.addIdentity(privateKey);
  }
  jsch.getSession(ftpUserName, ftpHost, ftpPort);
  Session session = jsch.getSession(ftpUserName, ftpHost, ftpPort); // 根據用戶名，主機ip，端口獲取一個Session對象
  if (StringUtils.isNotBlank(ftpPassword)) {
   session.setPassword(ftpPassword); // 設置密碼
  }
  return session;
 }
 /**
  * 獲取ChannelSftp鏈接
  * 
  * @param timeout
  *   超時時間
  * @return 返回ChannelSftp對象
  * @throws JSchException
  */
 public static ChannelSftp getChannelSftp(Session session, int timeout)
   throws JSchException {
  Channel channel = null;
  Properties config = new Properties();
  config.put("StrictHostKeyChecking", "no");
  session.setConfig(config); // 為Session對象設置properties
  session.setTimeout(timeout); // 設置timeout時間
  session.connect(); // 通過Session建立鏈接
  channel = session.openChannel("sftp"); // 打開SFTP通道
  channel.connect(); // 建立SFTP通道的連接
  return (ChannelSftp) channel; 
 }
 /**
  * 斷開sftp鏈接
  * 
  * @param session
  *   會話
  * @param channel
  *   通道
  */
 public static void closeConnection(Channel channel, Session session) {
  try {
   if (session != null) {
    session.disconnect(); //關閉session鏈接
   }
   if (channel != null) {
    channel.disconnect(); //斷開連接
   }
  } catch (Exception e) {
   e.printStackTrace();
  }
 }