java的ftp和sftp(上傳與下載)

記錄：備忘錄。
1.ftp的上傳與下載

public class FtpUtils {
  private static String hostName = "127.0.0.1";
  private static int port = 21;
  private static String userName = "root";
  private static String password = "123456";
  private static String pathName = "/";
  private static String savePath = "D://ftpdown//";
  private static String upPath = "D://ftpdown//";
  
  public static void main(String[] args) {
  
  	System.out.println("測試開始");
  	downFileFromFtp("abcdef.txt");
  	upFileToFtp("12345.txt");
  	System.out.println("測試結束");
  }
  
  /**
   * 上傳文件到ftp服務器
   */
  public static void upFileToFtp(String fileName) {
  
  	FTPClient ftpClient = null;
  	FileInputStream inputStream = null;
  	try {
  	  // 創建客戶端
  	  ftpClient = new FTPClient();
  	  // 連接FTP服務
  	  ftpClient.connect(hostName, port);
  	  // 登入FTP服務器
  	  ftpClient.login(userName, password);
      
  	  // 判斷連接是否成功
  	  int replyCode = ftpClient.getReplyCode();
  	  if (!FTPReply.isPositiveCompletion(replyCode)) {
  	  	System.out.println("連接失敗.");
  	  	ftpClient.disconnect();
  	  	return;
  	  }
  	  // 設置FTP連接控制的字符編碼
  	  ftpClient.setControlEncoding("UTF-8");
  	  // 設置文件傳輸類型
  	  ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
  	  // 設置上傳目錄,即FTP服務器指定目錄
  	  ftpClient.changeWorkingDirectory(pathName);
  	  // 設置緩存
  	  ftpClient.setBufferSize(1024 * 8);
  	  // 獲取文件流
  	  inputStream = new FileInputStream(new File(upPath + fileName));
  	  // 上傳文件
  	  boolean tt = ftpClient.storeFile(fileName, inputStream);
  	  ftpClient.logout();
  
  	} catch (IOException e) {
  		e.printStackTrace();
  	} finally {
  	  if (inputStream != null) {
  	  	try {
  	  		inputStream.close();
  	  	} catch (IOException e) {
  	  		e.printStackTrace();
  	  	}
  	  }
  	  if (ftpClient.isConnected()) {
  	  	try {
  	  		ftpClient.disconnect();
  	  	} catch (IOException e) {
  	  		e.printStackTrace();
  	  	}
  	  }
  	}
  	return;
  }
  
  /**
   * 從ftp服務器下載文件到本地
   */
  public static void downFileFromFtp(String fileName) {
  	StringBuffer sb = new StringBuffer();
  	FTPClient ftpClient = null;
  	File file = null;
  	FileOutputStream outputStream = null;
  	try {
  	  // 創建客戶端
  	  ftpClient = new FTPClient();
  	  // 連接FTP服務
  	  ftpClient.connect(hostName, port);
  	  // 登入FTP服務器
  	  ftpClient.login(userName, password);
      
  	  // 判斷連接是否成功
  	  int replyCode = ftpClient.getReplyCode();
  	  if (!FTPReply.isPositiveCompletion(replyCode)) {
  	  	System.out.println("連接失敗.");
  	  	ftpClient.disconnect();
  	  	return;
  	  }
  	  // 設置FTP連接控制的字符編碼
  	  ftpClient.setControlEncoding("UTF-8");
  	  // 設置文件傳輸類型
  	  ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
  	  // 設置上傳目錄,即FTP服務器指定目錄
  	  ftpClient.changeWorkingDirectory(pathName);
  	  // 設置緩存
  	  ftpClient.setBufferSize(1024 * 8);
           //獲取FTP文件列表
  	  FTPFile[] listFiles = ftpClient.listFiles();
  	  for (FTPFile ftpFile : listFiles) {
  	  	sb.append(ftpFile.getName() + " ");
  	  }
  	  String ftpFile = sb.toString();
  	  // 判斷FTP中是否包含文件
  	  if (ftpFile.contains(fileName)) {
  	  	//文件輸出流
  	  	file = new File(savePath + "/" + fileName);
  	  	outputStream = new FileOutputStream(file);
  	  	//文件下載
  	  	ftpClient.retrieveFile(fileName, outputStream);
  	  	System.out.println(fileName + "文件已下載成功");
  	  } else {
  	  	System.out.println(fileName + "文件下載失敗,文件不存在");
  	  }
  	  ftpClient.logout();
  	  return;
  	} catch (IOException e) {
  	  e.printStackTrace();
  	  System.out.println("文件下載異常");
  	  return;
  	} finally {
  	  if (outputStream != null) {
  	  	try {
  	  		outputStream.close();
  	  	} catch (IOException e) {
  	  		e.printStackTrace();
  	  	}
  	  }
  	  if (ftpClient != null) {
  	  	if (ftpClient.isConnected()) {
  	  	  try {
  	  	  	ftpClient.disconnect();
  	  	  } catch (IOException e) {
  	  	  	e.printStackTrace();
  	  	  }
  	  	}
  	  }
  	}
  }
}

2.sftp的上傳與下載

public class SftpUtils {
  
  private static String hostName = "127.0.0.1";
  private static int port = 10022;
  private static String userName = "root";
  private static String password = "123456";
  private static String pathName = "/";
  private static String savePath = "D://sftpdown//";
  private static String upPath = "D://sftpdown//";
  
  public static void main(String[] args) {
  
  	System.out.println("測試開始");
  	downFileFromSftp("abcdef.txt");
  	upFileToSftp("123456.txt");
  	System.out.println("測試結束");
  }
  
  /**
   * 上傳文件到sftp服務器
   */
  @SuppressWarnings("resource")
  public static void upFileToSftp(String fileName) {
  
  	ChannelSftp channelSftp = null;
  	Session sshSession = null;
  	OutputStream outputstream = null;
  	InputStream inputstream = null;
  
  	try {
  	  JSch jsch = new JSch();
  	  // 獲取Session
  	  sshSession = jsch.getSession(userName, hostName, port);
  	  // 設置密碼
  	  sshSession.setPassword(password);
  	  Properties sshConfig = new Properties();
  	  // 嚴格主機密鑰檢查
  	  sshConfig.put("StrictHostKeyChecking", "no");
  	  sshSession.setConfig(sshConfig);
  	  // 開啓sshSession鏈接
  	  sshSession.connect();
  	  // 獲取sftp通道
  	  Channel channel = sshSession.openChannel("sftp");
  	  // Channel連接
  	  channel.connect();
  	  channelSftp = (ChannelSftp) channel;
  	  // 需要下載的文件
  	  outputstream = channelSftp.put(fileName);
  	  inputstream = new FileInputStream(new File(upPath + fileName));
  	  byte buff[] = new byte[1024 * 8];
  	  int length;
  	  while ((length = inputstream.read(buff)) != -1) {
  	  	outputstream.write(buff, 0, length);
  	  }
  	  outputstream.flush();
  	  System.out.println("文件已經上傳.");
  	} catch (Exception e) {
  		e.printStackTrace();
  		System.out.println("文件已經上傳失敗.");
  		return;
  	} finally {
  	  if (outputstream != null) {
  	  	try {
  	  		outputstream.close();
  	  	} catch (IOException e) {
  	  		e.printStackTrace();
  	  	}
  	  }
  	  if (channelSftp != null) {
  	  	if (channelSftp.isConnected()) {
  	  		channelSftp.disconnect();
  	  	}
  	  }
  	  if (sshSession != null) {
  	  	if (sshSession.isConnected()) {
  	  		sshSession.disconnect();
  	  	}
  	  }
  	}
  }
  
  /**
   * 從sftp服務器下載文件
   */
  public static void downFileFromSftp(String fileName) {
  	ChannelSftp channelSftp = null;
  	Session sshSession = null;
  	FileOutputStream outputStream = null;
  	try {
  	  JSch jsch = new JSch();
  	  // 獲取Session
  	  sshSession = jsch.getSession(userName, hostName, port);
  	  // 設置密碼
  	  sshSession.setPassword(password);
  	  Properties sshConfig = new Properties();
  	  // 嚴格主機密鑰檢查
  	  sshConfig.put("StrictHostKeyChecking", "no");
  	  sshSession.setConfig(sshConfig);
  	  // 開啓sshSession鏈接
  	  sshSession.connect();
  	  // 獲取sftp通道
  	  Channel channel = sshSession.openChannel("sftp");
  	  // Channel連接
  	  channel.connect();
  	  channelSftp = (ChannelSftp) channel;
  	  if (pathName != null && !"".equals(pathName)) {
  	  	channelSftp.cd(pathName);
  	  }
  	  File file = null;
  	  // 獲取sftp目錄下所有的文件
  	  @SuppressWarnings("unchecked")
  	  Vector<String> ls = channelSftp.ls(pathName);
  	  String s = ls.toString();
  	  if (s.contains(fileName)) {
  	  	file = new File(savePath + "/" + fileName);
  	  	outputStream = new FileOutputStream(file);
  	  	channelSftp.get(fileName, outputStream);
  	  	System.out.println(fileName + "文件已下載至本地");
  	  } else {
  	  	System.out.println(fileName + "文件下載失敗");
  	  }
  	  return;
  	} catch (Exception e) {
  		e.printStackTrace();
  		return;
  	} finally {
  	  if (outputStream != null) {
  	  	try {
  	  		outputStream.close();
  	  	} catch (IOException e) {
  	  		e.printStackTrace();
  	  	}
  	  }
  	  if (channelSftp != null) {
  	  	if (channelSftp.isConnected()) {
  	  		channelSftp.disconnect();
  	  	}
  	  }
  	  if (sshSession != null) {
  	  	if (sshSession.isConnected()) {
  	  		sshSession.disconnect();
  	  	}
  	  }
  	}
  }
}

3.使用測試工具
        ftp使用工具FileZilla Server在windows搭建ftp服務器
        sftp使用工具FreeSSHd在windows搭建sftp服務器
4.問題點
4.1 使用ftpClient.storeFile()一直返回false
        本例是由於FileZilla Server啓動後，需對ftp指定目錄開發讀寫權限。
4.2 FileZilla Server和FreeSSHd在工具指定目錄在代碼中就是根目錄，使用/開始。
以上，感謝。