Examples of org.apache.commons.net.ftp.FTPClient

org.apache.commons.net.ftp.FTPClient
r connection attempt, you should check the reply code to verify // success. reply = ftp.getReplyCode(); if(!FTPReply.isPositiveCompletion(reply)) { ftp.disconnect(); System.err.println("FTP server refused connection."); System.exit(1); } } catch(IOException e) { if(ftp.isConnected()) { try { ftp.disconnect(); } catch(IOException f) { // do nothing } } System.err.println("Could not connect to server."); e.printStackTrace(); System.exit(1); }
Immediately after connecting is the only real time you need to check the reply code (because connect is of type void). The convention for all the FTP command methods in FTPClient is such that they either return a boolean value or some other value. The boolean methods return true on a successful completion reply from the FTP server and false on a reply resulting in an error condition or failure. The methods returning a value other than boolean return a value containing the higher level data produced by the FTP command, or null if a reply resulted in an error condition or failure. If you want to access the exact FTP reply code causing a success or failure, you must call getReplyCode after a success or failure.
The default settings for FTPClient are for it to use FTP.ASCII_FILE_TYPE , FTP.NON_PRINT_TEXT_FORMAT , FTP.STREAM_TRANSFER_MODE , and FTP.FILE_STRUCTURE . The only file types directly supported are FTP.ASCII_FILE_TYPE and FTP.IMAGE_FILE_TYPE (which is the same as FTP.BINARY_FILE_TYPE ). Because there are at lest 4 different EBCDIC encodings, we have opted not to provide direct support for EBCDIC. To transfer EBCDIC and other unsupported file types you must create your own filter InputStreams and OutputStreams and wrap them around the streams returned or required by the FTPClient methods. FTPClient uses the NetASCII filter streams in org.apache.commons.net.io to provide transparent handling of ASCII files. We will consider incorporating EBCDIC support if there is enough demand.
FTP.NON_PRINT_TEXT_FORMAT , FTP.STREAM_TRANSFER_MODE , and FTP.FILE_STRUCTURE are the only supported formats, transfer modes, and file structures.
Because the handling of sockets on different platforms can differ significantly, the FTPClient automatically issues a new PORT command prior to every transfer requiring that the server connect to the client's data port. This ensures identical problem-free behavior on Windows, Unix, and Macintosh platforms. Additionally, it relieves programmers from having to issue the PORT command themselves and dealing with platform dependent issues.
Additionally, for security purposes, all data connections to the client are verified to ensure that they originated from the intended party (host and port). If a data connection is initiated by an unexpected party, the command will close the socket and throw an IOException. You may disable this behavior with setRemoteVerificationEnabled().
You should keep in mind that the FTP server may choose to prematurely close a connection if the client has been idle for longer than a given time period (usually 900 seconds). The FTPClient class will detect a premature FTP server connection closing when it receives a FTPReply.SERVICE_NOT_AVAILABLE response to a command. When that occurs, the FTP class method encountering that reply will throw an FTPConnectionClosedException . FTPConnectionClosedException is a subclass of IOException and therefore need not be caught separately, but if you are going to catch it separately, its catch block must appear before the more general IOException catch block. When you encounter an FTPConnectionClosedException , you must disconnect the connection with disconnect() to properly clean up the system resources used by FTPClient. Before disconnecting, you may check the last reply code and text with getReplyCode , getReplyString , and getReplyStrings. You may avoid server disconnections while the client is idle by periodicaly sending NOOP commands to the server.
Rather than list it separately for each method, we mention here that every method communicating with the server and throwing an IOException can also throw a MalformedServerReplyException , which is a subclass of IOException. A MalformedServerReplyException will be thrown when the reply received from the server deviates enough from the protocol specification that it cannot be interpreted in a useful manner despite attempts to be as lenient as possible.

@author Daniel F. Savarese @see FTP @see FTPConnectionClosedException @see DefaultFTPFileListParser @see org.apache.commons.net.MalformedServerReplyException

        }
    }
    
    public RemoteFileOperations<FTPFile> createRemoteFileOperations() throws Exception {
        // configure ftp client
        FTPClient client = ftpClient;
        
        if (client == null) {
            // must use a new client if not explicit configured to use a custom client
            client = createFtpClient();
        }


        // set any endpoint configured timeouts
        if (getConfiguration().getConnectTimeout() > -1) {
            client.setConnectTimeout(getConfiguration().getConnectTimeout());
        }
        if (getConfiguration().getSoTimeout() > -1) {
            soTimeout = getConfiguration().getSoTimeout();
        }
        dataTimeout = getConfiguration().getTimeout();


        // then lookup ftp client parameters and set those
        if (ftpClientParameters != null) {
            Map<String, Object> localParameters = new HashMap<String, Object>(ftpClientParameters);
            // setting soTimeout has to be done later on FTPClient (after it has connected)
            Object timeout = localParameters.remove("soTimeout");
            if (timeout != null) {
                soTimeout = getCamelContext().getTypeConverter().convertTo(int.class, timeout);
            }
            // and we want to keep data timeout so we can log it later
            timeout = localParameters.remove("dataTimeout");
            if (timeout != null) {
                dataTimeout = getCamelContext().getTypeConverter().convertTo(int.class, dataTimeout);
            }
            setProperties(client, localParameters);
        }
        
        if (ftpClientConfigParameters != null) {
            // client config is optional so create a new one if we have parameter for it
            if (ftpClientConfig == null) {
                ftpClientConfig = new FTPClientConfig();
            }
            Map<String, Object> localConfigParameters = new HashMap<String, Object>(ftpClientConfigParameters);
            setProperties(ftpClientConfig, localConfigParameters);
        }


        if (dataTimeout > 0) {
            client.setDataTimeout(dataTimeout);
        }


        if (log.isDebugEnabled()) {
            log.debug("Created FTPClient [connectTimeout: {}, soTimeout: {}, dataTimeout: {}]: {}", 
                    new Object[]{client.getConnectTimeout(), getSoTimeout(), dataTimeout, client});
        }


        FtpOperations operations = new FtpOperations(client, getFtpClientConfig());
        operations.setEndpoint(this);
        return operations;

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        operations.setEndpoint(this);
        return operations;
    }


    protected FTPClient createFtpClient() throws Exception {
        return new FTPClient();
    }

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    String dir = getOutputPath(job).toString();
    System.out.println("\n\ninside ftpoutputformat" + ip + " " + portno
        + " " + usr + " " + pwd + " " + dir);
    String keyValueSeparator = conf.get(
        "mapred.textoutputformat.separator", "\t");
    FTPClient f = new FTPClient();
    f.connect(ip, Integer.parseInt(portno));
    f.login(usr, pwd);
    f.changeWorkingDirectory(dir);
    f.setFileType(FTP.BINARY_FILE_TYPE);


    boolean isCompressed = getCompressOutput(job);
    CompressionCodec codec = null;
    String extension = "";
    if (isCompressed) {
      Class<? extends CompressionCodec> codecClass = getOutputCompressorClass(
          job, GzipCodec.class);
      codec = (CompressionCodec) ReflectionUtils.newInstance(codecClass,
          conf);
      extension = codec.getDefaultExtension();
    }
    Path file = getDefaultWorkFile(job, extension);
    FileSystem fs = file.getFileSystem(conf);
    String filename = file.getName();
    if (!isCompressed) {
      // FSDataOutputStream fileOut = fs.create(file, false);
      OutputStream os = f.appendFileStream(filename);
      DataOutputStream fileOut = new DataOutputStream(os);
      return new FTPLineRecordWriter<K, V>(fileOut, new String(
          keyValueSeparator), f);


    } else {
      // FSDataOutputStream fileOut = fs.create(file, false);
      OutputStream os = f.appendFileStream(filename);
      DataOutputStream fileOut = new DataOutputStream(os);
      return new FTPLineRecordWriter<K, V>(new DataOutputStream(
          codec.createOutputStream(fileOut)), keyValueSeparator, f);
    }
  }

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    private AbstractDownload download;
    private boolean restart;


    FtpClient(DownloadSettings settings) {
        this.settings = settings;
        client = new FTPClient();
    }

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  private Properties      properties  = new Properties();


  private boolean initConnection() {
    try {
      if (ftp == null) {
        ftp = new FTPClient();
        serverIP = getServer();
        userName = getUserName();
        password = getPassword();
      }
      ftp.connect(serverIP);

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        if (args.length == 4)
        {
            dir = args[3];
        }


        FTPClient client = new FTPClient();
        client.connect(host);
        int reply = client.getReplyCode();
        if (!FTPReply.isPositiveCompletion(reply))
        {
            throw new IllegalArgumentException("cant connect: " + reply);
        }
        if (!client.login(user, pass))
        {
            throw new IllegalArgumentException("login failed");
        }
        client.enterLocalPassiveMode();


        OutputStream os = client.storeFileStream(dir + "/test.txt");
        if (os == null)
        {
            throw new IllegalStateException(client.getReplyString());
        }
        os.write("test".getBytes());
        os.close();
        client.completePendingCommand();


        if (dir != null)
        {
            if (!client.changeWorkingDirectory(dir))
            {
                throw new IllegalArgumentException("change dir to '" + dir + "' failed");
            }
        }


        System.err.println("System: " + client.getSystemType());


        FTPFile[] files = client.listFiles();
        for (int i = 0; i < files.length; i++)
        {
            FTPFile file = files[i];
            if (file == null)
            {
                System.err.println("#" + i + ": " + null);
            }
            else
            {
                System.err.println("#" + i + ": " + file.getRawListing());
                System.err.println("#" + i + ": " + file.toString());
                System.err.println("\t name:" + file.getName() + " type:" + file.getType());
            }
        }
        client.disconnect();
    }

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   * 
   * @return An FTPClient instance
   * @throws IOException
   */
  private FTPClient connect() throws IOException {
    FTPClient client = null;
    Configuration conf = getConf();
    String host = conf.get(FS_FTP_HOST);
    int port = conf.getInt(FS_FTP_HOST_PORT, FTP.DEFAULT_PORT);
    String user = conf.get(FS_FTP_USER_PREFIX + host);
    String password = conf.get(FS_FTP_PASSWORD_PREFIX + host);
    client = new FTPClient();
    client.connect(host, port);
    int reply = client.getReplyCode();
    if (!FTPReply.isPositiveCompletion(reply)) {
      throw NetUtils.wrapException(host, port,
                   NetUtils.UNKNOWN_HOST, 0,
                   new ConnectException("Server response " + reply));
    } else if (client.login(user, password)) {
      client.setFileTransferMode(FTP.BLOCK_TRANSFER_MODE);
      client.setFileType(FTP.BINARY_FILE_TYPE);
      client.setBufferSize(DEFAULT_BUFFER_SIZE);
    } else {
      throw new IOException("Login failed on server - " + host + ", port - "
          + port + " as user '" + user + "'");
    }

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    return new Path(workDir, path);
  }


  @Override
  public FSDataInputStream open(Path file, int bufferSize) throws IOException {
    FTPClient client = connect();
    Path workDir = new Path(client.printWorkingDirectory());
    Path absolute = makeAbsolute(workDir, file);
    FileStatus fileStat = getFileStatus(client, absolute);
    if (fileStat.isDirectory()) {
      disconnect(client);
      throw new FileNotFoundException("Path " + file + " is a directory.");
    }
    client.allocate(bufferSize);
    Path parent = absolute.getParent();
    // Change to parent directory on the
    // server. Only then can we read the
    // file
    // on the server by opening up an InputStream. As a side effect the working
    // directory on the server is changed to the parent directory of the file.
    // The FTP client connection is closed when close() is called on the
    // FSDataInputStream.
    client.changeWorkingDirectory(parent.toUri().getPath());
    InputStream is = client.retrieveFileStream(file.getName());
    FSDataInputStream fis = new FSDataInputStream(new FTPInputStream(is,
        client, statistics));
    if (!FTPReply.isPositivePreliminary(client.getReplyCode())) {
      // The ftpClient is an inconsistent state. Must close the stream
      // which in turn will logout and disconnect from FTP server
      fis.close();
      throw new IOException("Unable to open file: " + file + ", Aborting");
    }

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   */
  @Override
  public FSDataOutputStream create(Path file, FsPermission permission,
      boolean overwrite, int bufferSize, short replication, long blockSize,
      Progressable progress) throws IOException {
    final FTPClient client = connect();
    Path workDir = new Path(client.printWorkingDirectory());
    Path absolute = makeAbsolute(workDir, file);
    FileStatus status;
    try {
      status = getFileStatus(client, file);
    } catch (FileNotFoundException fnfe) {
      status = null;
    }
    if (status != null) {
      if (overwrite && !status.isDirectory()) {
        delete(client, file, false);
      } else {
        disconnect(client);
        throw new FileAlreadyExistsException("File already exists: " + file);
      }
    }
    
    Path parent = absolute.getParent();
    if (parent == null || !mkdirs(client, parent, FsPermission.getDirDefault())) {
      parent = (parent == null) ? new Path("/") : parent;
      disconnect(client);
      throw new IOException("create(): Mkdirs failed to create: " + parent);
    }
    client.allocate(bufferSize);
    // Change to parent directory on the server. Only then can we write to the
    // file on the server by opening up an OutputStream. As a side effect the
    // working directory on the server is changed to the parent directory of the
    // file. The FTP client connection is closed when close() is called on the
    // FSDataOutputStream.
    client.changeWorkingDirectory(parent.toUri().getPath());
    FSDataOutputStream fos = new FSDataOutputStream(client.storeFileStream(file
        .getName()), statistics) {
      @Override
      public void close() throws IOException {
        super.close();
        if (!client.isConnected()) {
          throw new FTPException("Client not connected");
        }
        boolean cmdCompleted = client.completePendingCommand();
        disconnect(client);
        if (!cmdCompleted) {
          throw new FTPException("Could not complete transfer, Reply Code - "
              + client.getReplyCode());
        }
      }
    };
    if (!FTPReply.isPositivePreliminary(client.getReplyCode())) {
      // The ftpClient is an inconsistent state. Must close the stream
      // which in turn will logout and disconnect from FTP server
      fos.close();
      throw new IOException("Unable to create file: " + file + ", Aborting");
    }

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    }
  }


  @Override
  public boolean delete(Path file, boolean recursive) throws IOException {
    FTPClient client = connect();
    try {
      boolean success = delete(client, file, recursive);
      return success;
    } finally {
      disconnect(client);

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