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 InputStream retrieveFileStream(String relPath, long restartOffset) throws IOException
    {
        try
        {
            FTPClient client = getFtpClient();
            client.setRestartOffset(restartOffset);
            return client.retrieveFileStream(relPath);
        }
        catch (IOException e)
        {
            disconnect();


            FTPClient client = getFtpClient();
            client.setRestartOffset(restartOffset);
            return client.retrieveFileStream(relPath);
        }
    }

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            password = "anonymous".toCharArray();
        }


        try
        {
            final FTPClient client = new FTPClient();


            String key = FtpFileSystemConfigBuilder.getInstance().getEntryParser(fileSystemOptions);
            if (key != null)
            {
              FTPClientConfig config = new FTPClientConfig(key);
              
              String serverLanguageCode = FtpFileSystemConfigBuilder.getInstance().getServerLanguageCode(fileSystemOptions);
              if (serverLanguageCode != null)
              {
                config.setServerLanguageCode(serverLanguageCode);
              }
              String defaultDateFormat = FtpFileSystemConfigBuilder.getInstance().getDefaultDateFormat(fileSystemOptions);
              if (defaultDateFormat != null)
              {
                config.setDefaultDateFormatStr(defaultDateFormat);
              }
              String recentDateFormat = FtpFileSystemConfigBuilder.getInstance().getRecentDateFormat(fileSystemOptions);
              if (recentDateFormat != null)
              {
                config.setRecentDateFormatStr(recentDateFormat);
              }
              String serverTimeZoneId = FtpFileSystemConfigBuilder.getInstance().getServerTimeZoneId(fileSystemOptions);
              if (serverTimeZoneId != null)
              {
                config.setServerTimeZoneId(serverTimeZoneId);
              }
              String[] shortMonthNames = FtpFileSystemConfigBuilder.getInstance().getShortMonthNames(fileSystemOptions);
              if (shortMonthNames != null)
              {
                StringBuffer shortMonthNamesStr = new StringBuffer(40);
                for (int i = 0; i<shortMonthNames.length; i++)
                {
                  if (shortMonthNamesStr.length()>0)
                  {
                    shortMonthNamesStr.append("|");
                  }
                  shortMonthNamesStr.append(shortMonthNames[i]);                  
                }
                config.setShortMonthNames(shortMonthNamesStr.toString());
              }
              
              client.configure(config);
            }
            
            FTPFileEntryParserFactory myFactory = FtpFileSystemConfigBuilder.getInstance().getEntryParserFactory(fileSystemOptions);
            if (myFactory != null)
            {
                client.setParserFactory(myFactory);
            }


            try
            {
                client.connect(hostname, port);


                int reply = client.getReplyCode();
                if (!FTPReply.isPositiveCompletion(reply))
                {
                    throw new FileSystemException("vfs.provider.ftp/connect-rejected.error", hostname);
                }


                // Login
                if (!client.login(
          UserAuthenticatorUtils.toString(username),
          UserAuthenticatorUtils.toString(password)))
                {
                    throw new FileSystemException("vfs.provider.ftp/login.error", new Object[]{hostname, UserAuthenticatorUtils.toString(username)}, null);
                }


                // Set binary mode
                if (!client.setFileType(FTP.BINARY_FILE_TYPE))
                {
                    throw new FileSystemException("vfs.provider.ftp/set-binary.error", hostname);
                }


                // Set dataTimeout value
                Integer dataTimeout = FtpFileSystemConfigBuilder.getInstance().getDataTimeout(fileSystemOptions);
                if (dataTimeout != null)
                {
                    client.setDataTimeout(dataTimeout.intValue());
                }


                // Change to root by default
                // All file operations a relative to the filesystem-root
                // String root = getRoot().getName().getPath();


                Boolean userDirIsRoot = FtpFileSystemConfigBuilder.getInstance().getUserDirIsRoot(fileSystemOptions);
                if (workingDirectory != null && (userDirIsRoot == null || !userDirIsRoot.booleanValue()))
                {
                    if (!client.changeWorkingDirectory(workingDirectory))
                    {
                        throw new FileSystemException("vfs.provider.ftp/change-work-directory.error", workingDirectory);
                    }
                }


                Boolean passiveMode = FtpFileSystemConfigBuilder.getInstance().getPassiveMode(fileSystemOptions);
                if (passiveMode != null && passiveMode.booleanValue())
                {
                    client.enterLocalPassiveMode();
                }
            }
            catch (final IOException e)
            {
                if (client.isConnected())
                {
                    client.disconnect();
                }
                throw e;
            }


            return client;

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            client.disconnect();
        }
    }


    public static FTPClient createNewFtpClient() {
        return new FTPClient();
    }

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    // Implementation methods
    //-------------------------------------------------------------------------


    protected void processInOnly(MessageExchange exchange, NormalizedMessage message) throws Exception {
        FTPClient client = null;
        OutputStream out = null;
        String name = null;
        String uploadName = null;
        try {
            client = borrowClient();
            // Change to the directory specified by the URI path if any
            if (uri != null && uri.getPath() != null) {
                client.changeWorkingDirectory(uri.getPath());
            }


            name = marshaler.getOutputName(exchange, message);
            if (name == null) {
                if (uniqueFileName != null) {
                    out = client.storeUniqueFileStream(uniqueFileName);
                } else {
                    out = client.storeUniqueFileStream();
                }
            } else {
                if (client.listFiles(name).length > 0) {
                    if (overwrite) {
                        client.deleteFile(name);
                    } else {
                        throw new IOException("Can not send " + name
                                + " : file already exists and overwrite has not been enabled");
                    }
                }
                uploadName = uploadSuffix == null ? name : name + uploadSuffix;
                out = client.storeFileStream(uploadName);
            }
            if (out == null) {
                throw new IOException("No output stream available for output name: " + uploadName + ". Maybe the file already exists?");
            }
            marshaler.writeMessage(exchange, message, out, uploadName);
        } finally {
            if (out != null) {
                try {
                    out.close();
                    client.completePendingCommand();
                    if (name != null && !name.equals(uploadName) && !client.rename(uploadName, name)) {
                        throw new IOException("File " + uploadName + " could not be renamed to " + name);
                    }
                } catch (IOException e) {
                    logger.error("Caught exception while closing stream on error: " + e, e);
                }

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    private FTPClientConfig config;
    private String controlEncoding = DEFAULT_CONTROL_ENCODING;
    private int dataTimeout = DEFAULT_DATA_TIMEOUT;


    public boolean validateObject(Object object) {
        FTPClient client = (FTPClient) object;
        try {
            return client.sendNoOp();
        } catch (IOException e) {
            throw new RuntimeException("Failed to validate client: " + e, e);
        }
    }

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            throw new RuntimeException("Failed to validate client: " + e, e);
        }
    }


    public void activateObject(Object object) throws Exception {
        FTPClient client = (FTPClient) object;
        client.setReaderThread(true);
    }

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        FTPClient client = (FTPClient) object;
        client.setReaderThread(true);
    }


    public void passivateObject(Object object) throws Exception {
        FTPClient client = (FTPClient) object;
        client.setReaderThread(false);
    }

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    }


    // Implementation methods
    //-------------------------------------------------------------------------
    protected void connect(SocketClient client) throws Exception {
        FTPClient ftp = (FTPClient) client;


        if (config != null) {
            ftp.configure(config);
        }
        ftp.setDataTimeout(getDataTimeout());
        ftp.setControlEncoding(getControlEncoding());


        super.connect(ftp);


        int code = ftp.getReplyCode();
        if (!FTPReply.isPositiveCompletion(code)) {
            ftp.disconnect();
            throw new ConnectionRefusedException(code);
        }
        if (!ftp.login(getUsername(), getPassword())) {
            ftp.disconnect();
            throw new ConnectionRefusedException(ftp.getReplyCode());
        }
        if (isBinaryMode()) {
            ftp.setFileType(FTP.BINARY_FILE_TYPE);
        }
        if (isPassiveMode()) {
            ftp.enterLocalPassiveMode();
        }
    }

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            ftp.enterLocalPassiveMode();
        }
    }


    protected void disconnect(SocketClient client) throws Exception {
        FTPClient ftp = (FTPClient) client;
        if (ftp.isConnected()) {
            ftp.logout();
        }
        super.disconnect(client);
    }

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        }
        super.disconnect(client);
    }


    protected SocketClient createSocketClient() {
        return new FTPClient();
    }

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