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

   * @see #closeFtpConnection()
   */
  public void openFtpConnection(String workingDirectory) throws RQLException {
    try {
      // create a client
      ftpClient = new FTPClient();
      ftpClient.connect(server);
      ftpClient.login(user, password);
      // change into rd import directory
      ftpClient.changeWorkingDirectory(workingDirectory);
    } catch (IOException ioex) {

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            throw new AuthenticationException( "Password not specified for repository " + getRepository().getId() );
        }


        String host = getRepository().getHost();


        ftp = new FTPClient();
        ftp.setDefaultTimeout( getTimeout() );
        ftp.setDataTimeout( getTimeout() );
        ftp.setControlEncoding( getControlEncoding() );


        ftp.addProtocolCommandListener( new PrintCommandListener( this ) );

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            password = "anonymous".toCharArray();
        }


        try
        {
            final FTPClient client = new FTPClient();


            configureClient(fileSystemOptions, client);


            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());
                }


                Integer socketTimeout = FtpFileSystemConfigBuilder.getInstance().getSoTimeout(fileSystemOptions);
                if (socketTimeout != null)
                {
                    client.setSoTimeout(socketTimeout.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();
                }


                String controlEncoding = FtpFileSystemConfigBuilder.getInstance().getControlEncoding(fileSystemOptions);
                if (controlEncoding != null)
                {
                    client.setControlEncoding(controlEncoding);
                }
            }
            catch (final IOException e)
            {
                if (client.isConnected())
                {
                    client.disconnect();
                }
                throw e;
            }


            return client;

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    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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        }
    }
    
    protected 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) {
            // setting soTimeout has to be done later on FTPClient (after it has connected)
            Object timeout = ftpClientParameters.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 = ftpClientParameters.remove("dataTimeout");
            if (timeout != null) {
                dataTimeout = getCamelContext().getTypeConverter().convertTo(int.class, dataTimeout);
            }
            IntrospectionSupport.setProperties(client, ftpClientParameters);
        }
        
        if (ftpClientConfigParameters != null) {
            // client config is optional so create a new one if we have parameter for it
            if (ftpClientConfig == null) {
                ftpClientConfig = new FTPClientConfig();
            }
            IntrospectionSupport.setProperties(ftpClientConfig, ftpClientConfigParameters);
        }


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


        if (log.isDebugEnabled()) {
            log.debug("Created FTPClient [connectTimeout: " + client.getConnectTimeout() + ", soTimeout: " + getSoTimeout() + ", dataTimeout: " + 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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    /**
     * Creates a new FtpClient
     */
    public CommonsNetFtpClient() {
        super("ftp");
        ftp = new FTPClient();
    }

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     *         correctly.
     */
    public void execute() throws BuildException {
        checkConfiguration();


        FTPClient ftp = null;


        try {
            log("Opening FTP connection to " + server, Project.MSG_VERBOSE);


            ftp = new FTPClient();


            ftp.connect(server, port);
            if (!FTPReply.isPositiveCompletion(ftp.getReplyCode())) {
                throw new BuildException("FTP connection failed: "
                     + ftp.getReplyString());
            }


            log("connected", Project.MSG_VERBOSE);
            log("logging in to FTP server", Project.MSG_VERBOSE);


            if (!ftp.login(userid, password)) {
                throw new BuildException("Could not login to FTP server");
            }


            log("login succeeded", Project.MSG_VERBOSE);


            if (binary) {
                ftp.setFileType(org.apache.commons.net.ftp.FTP.IMAGE_FILE_TYPE);
                if (!FTPReply.isPositiveCompletion(ftp.getReplyCode())) {
                    throw new BuildException("could not set transfer type: "
                        + ftp.getReplyString());
                }
            } else {
                ftp.setFileType(org.apache.commons.net.ftp.FTP.ASCII_FILE_TYPE);
                if (!FTPReply.isPositiveCompletion(ftp.getReplyCode())) {
                    throw new BuildException("could not set transfer type: "
                        + ftp.getReplyString());
                }
            }


            if (passive) {
                log("entering passive mode", Project.MSG_VERBOSE);
                ftp.enterLocalPassiveMode();
                if (!FTPReply.isPositiveCompletion(ftp.getReplyCode())) {
                    throw new BuildException("could not enter into passive "
                         + "mode: " + ftp.getReplyString());
                }
            }


            // For a unix ftp server you can set the default mask for all files
            // created.


            if (umask != null) {
                doSiteCommand(ftp, "umask " + umask);
            }


            // If the action is MK_DIR, then the specified remote
            // directory is the directory to create.


            if (action == MK_DIR) {
                makeRemoteDir(ftp, remotedir);
            } else {
                if (remotedir != null) {
                    log("changing the remote directory", Project.MSG_VERBOSE);
                    ftp.changeWorkingDirectory(remotedir);
                    if (!FTPReply.isPositiveCompletion(ftp.getReplyCode())) {
                        throw new BuildException("could not change remote "
                             + "directory: " + ftp.getReplyString());
                    }
                }
                if (newerOnly && timeDiffAuto) {
                // in this case we want to find how much time span there is between local
                // and remote
                    timeDiffMillis = getTimeDiff(ftp);
                }
                log(ACTION_STRS[action] + " " + ACTION_TARGET_STRS[action]);
                transferFiles(ftp);
            }


        } catch (IOException ex) {
            throw new BuildException("error during FTP transfer: " + ex);
        } finally {
            if (ftp != null && ftp.isConnected()) {
                try {
                    log("disconnecting", Project.MSG_VERBOSE);
                    ftp.logout();
                    ftp.disconnect();
                } catch (IOException ex) {
                    // ignore it
                }
            }
        }

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    public static final void main(String[] args)
    {
        String server1, username1, password1, file1;
        String server2, username2, password2, file2;
        FTPClient ftp1, ftp2;
        ProtocolCommandListener listener;


        if (args.length < 8)
        {
            System.err.println(
                "Usage: ftp <host1> <user1> <pass1> <file1> <host2> <user2> <pass2> <file2>"
            );
            System.exit(1);
        }


        server1 = args[0];
        username1 = args[1];
        password1 = args[2];
        file1 = args[3];
        server2 = args[4];
        username2 = args[5];
        password2 = args[6];
        file2 = args[7];


        listener = new PrintCommandListener(new PrintWriter(System.out));
        ftp1 = new FTPClient();
        ftp1.addProtocolCommandListener(listener);
        ftp2 = new FTPClient();
        ftp2.addProtocolCommandListener(listener);


        try
        {
            int reply;
            ftp1.connect(server1);
            System.out.println("Connected to " + server1 + ".");


            reply = ftp1.getReplyCode();


            if (!FTPReply.isPositiveCompletion(reply))
            {
                ftp1.disconnect();
                System.err.println("FTP server1 refused connection.");
                System.exit(1);
            }
        }
        catch (IOException e)
        {
            if (ftp1.isConnected())
            {
                try
                {
                    ftp1.disconnect();
                }
                catch (IOException f)
                {
                    // do nothing
                }
            }
            System.err.println("Could not connect to server1.");
            e.printStackTrace();
            System.exit(1);
        }


        try
        {
            int reply;
            ftp2.connect(server2);
            System.out.println("Connected to " + server2 + ".");


            reply = ftp2.getReplyCode();


            if (!FTPReply.isPositiveCompletion(reply))
            {
                ftp2.disconnect();
                System.err.println("FTP server2 refused connection.");
                System.exit(1);
            }
        }
        catch (IOException e)
        {
            if (ftp2.isConnected())
            {
                try
                {
                    ftp2.disconnect();
                }
                catch (IOException f)
                {
                    // do nothing
                }
            }
            System.err.println("Could not connect to server2.");
            e.printStackTrace();
            System.exit(1);
        }


__main:
        try
        {
            if (!ftp1.login(username1, password1))
            {
                System.err.println("Could not login to " + server1);
                break __main;
            }


            if (!ftp2.login(username2, password2))
            {
                System.err.println("Could not login to " + server2);
                break __main;
            }


            // Let's just assume success for now.
            ftp2.enterRemotePassiveMode();


            ftp1.enterRemoteActiveMode(InetAddress.getByName(ftp2.getPassiveHost()),
                                       ftp2.getPassivePort());


            // Although you would think the store command should be sent to server2
            // first, in reality, ftp servers like wu-ftpd start accepting data
            // connections right after entering passive mode.  Additionally, they
            // don't even send the positive preliminary reply until after the
            // transfer is completed (in the case of passive mode transfers).
            // Therefore, calling store first would hang waiting for a preliminary
            // reply.
            if (ftp1.remoteRetrieve(file1) && ftp2.remoteStoreUnique(file2))
            {
                //      if(ftp1.remoteRetrieve(file1) && ftp2.remoteStore(file2)) {
                // We have to fetch the positive completion reply.
                ftp1.completePendingCommand();
                ftp2.completePendingCommand();
            }
            else
            {
                System.err.println(
                    "Couldn't initiate transfer.  Check that filenames are valid.");
                break __main;
            }


        }
        catch (IOException e)
        {
            e.printStackTrace();
            System.exit(1);
        }
        finally
        {
            try
            {
                if (ftp1.isConnected())
                {
                    ftp1.logout();
                    ftp1.disconnect();
                }
            }
            catch (IOException e)
            {
                // do nothing

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    public static final void main(String[] args)
    {
        int base = 0;
        boolean storeFile = false, binaryTransfer = false, error = false;
        String server, username, password, remote, local;
        FTPClient ftp;


        for (base = 0; base < args.length; base++)
        {
            if (args[base].startsWith("-s"))
                storeFile = true;
            else if (args[base].startsWith("-b"))
                binaryTransfer = true;
            else
                break;
        }


        if ((args.length - base) != 5)
        {
            System.err.println(USAGE);
            System.exit(1);
        }


        server = args[base++];
        username = args[base++];
        password = args[base++];
        remote = args[base++];
        local = args[base];


        ftp = new FTPClient();
        ftp.addProtocolCommandListener(new PrintCommandListener(
                                           new PrintWriter(System.out)));


        try
        {
            int reply;
            ftp.connect(server);
            System.out.println("Connected to " + server + ".");


            // After 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);
        }


__main:
        try
        {
            if (!ftp.login(username, password))
            {
                ftp.logout();
                error = true;
                break __main;
            }


            System.out.println("Remote system is " + ftp.getSystemName());


            if (binaryTransfer)
                ftp.setFileType(FTP.BINARY_FILE_TYPE);


            // Use passive mode as default because most of us are
            // behind firewalls these days.
            ftp.enterLocalPassiveMode();


            if (storeFile)
            {
                InputStream input;


                input = new FileInputStream(local);


                ftp.storeFile(remote, input);


                input.close();
            }
            else
            {
                OutputStream output;


                output = new FileOutputStream(local);


                ftp.retrieveFile(remote, output);


                output.close();
            }


            ftp.logout();
        }
        catch (FTPConnectionClosedException e)
        {
            error = true;
            System.err.println("Server closed connection.");
            e.printStackTrace();
        }
        catch (IOException e)
        {
            error = true;
            e.printStackTrace();
        }
        finally
        {
            if (ftp.isConnected())
            {
                try
                {
                    ftp.disconnect();
                }
                catch (IOException f)
                {
                    // do nothing
                }

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