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

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




    protected void pollFileOrDirectory(String fileOrDirectory) throws Exception {
        FTPClient ftp = borrowClient();
        try {
            logger.debug("Polling directory " + fileOrDirectory);
            pollFileOrDirectory(ftp, fileOrDirectory, isRecursive());
        } finally {
            returnClient(ftp);

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            }
        });
    }


    protected boolean processFileAndDelete(String file) {
        FTPClient ftp = null;
        boolean unlock = true;
        try {
            ftp = borrowClient();
            if (logger.isDebugEnabled()) {
                logger.debug("Processing file " + file);
            }
            if (ftp.listFiles(file).length > 0) {
                // Process the file. If processing fails, an exception should be thrown.
                processFile(ftp, file);
                // Processing is successful
                // We should not unlock until the file has been deleted
                unlock = false;
                if (isDeleteFile()) {
                    if (!ftp.deleteFile(file)) {
                        throw new IOException("Could not delete file " + file);
                    }
                    unlock = true;
                }
            } else {

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    private String getWorkingPath() {
      return path == null ? "." : path;
    }


    public void poll() throws Exception {
        FTPClient ftp = (FTPClient) borrowClient();
        try {
            FTPFile[] files = ftp.listFiles(getWorkingPath());
            for (int i = 0; i < files.length; i++) {
                pollFile(files[i]);
            }
        }
        finally {

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    protected void processFile(FTPFile file) {
        if (file.getName().equals(".") || file.getName().equals("..")) { // TODO: what about other directories?
          return;
        }
        FTPClient client = null;
        try {
            client = (FTPClient) borrowClient();
            processFile(client, file);
            if (!client.deleteFile(getWorkingPath() + file.getName())) {
                throw new IOException("Could not delete file " + file);
            }
        }
        catch (Exception e) {
            log.error("Failed to process file: " + file + ". Reason: " + e, e);

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            return ServiceUtil.returnError(UtilProperties.getMessage(resource, "CommonFtpFileCannotBeOpen", locale));
        }


        List<String> errorList = FastList.newInstance();


        FTPClient ftp = new FTPClient();
        try {
            Debug.logInfo("[putFile] connecting to: " + (String) context.get("hostname"), module);
            ftp.connect((String) context.get("hostname"));
            if (!FTPReply.isPositiveCompletion(ftp.getReplyCode())) {
                Debug.logInfo("[putFile] Server refused connection", module);
                errorList.add(UtilProperties.getMessage(resource, "CommonFtpConnectionRefused", locale));
            } else {
                String username = (String) context.get("username");
                String password = (String) context.get("password");
                Debug.logInfo("[putFile] logging in: username=" + username + ", password=" + password, module);
                if (!ftp.login(username, password)) {
                    Debug.logInfo("[putFile] login failed", module);
                    errorList.add(UtilProperties.getMessage(resource, "CommonFtpLoginFailure", UtilMisc.toMap("username", username, "password", password), locale));
                } else {
                    Boolean binaryTransfer = (Boolean) context.get("binaryTransfer");
                    boolean binary = (binaryTransfer == null) ? false : binaryTransfer.booleanValue();
                    if (binary) { ftp.setFileType(FTP.BINARY_FILE_TYPE); }


                    Boolean passiveMode = (Boolean) context.get("passiveMode");
                    boolean passive = (passiveMode == null) ? true : passiveMode.booleanValue();
                    if (passive) { ftp.enterLocalPassiveMode(); }


                    Debug.logInfo("[putFile] storing local file remotely as: " + context.get("remoteFilename"), module);
                    if (!ftp.storeFile((String) context.get("remoteFilename"), localFile)) {
                        Debug.logInfo("[putFile] store was unsuccessful", module);
                        errorList.add(UtilProperties.getMessage(resource, "CommonFtpFileNotSentSuccesfully", UtilMisc.toMap("replyString", ftp.getReplyString()), locale));
                    } else {
                        Debug.logInfo("[putFile] store was successful", module);
                        List<String> siteCommands = checkList(context.get("siteCommands"), String.class);
                        if (siteCommands != null) {
                            for (String command: siteCommands) {
                                Debug.logInfo("[putFile] sending SITE command: " + command, module);
                                if (!ftp.sendSiteCommand(command)) {
                                    errorList.add(UtilProperties.getMessage(resource, "CommonFtpSiteCommandFailed", UtilMisc.toMap("command", command, "replyString", ftp.getReplyString()), locale));
                                }
                            }
                        }
                    }
                }
                ftp.logout();
            }
        } catch (IOException ioe) {
            Debug.logInfo(ioe, "[putFile] caught exception: " + ioe.getMessage(), module);
            errorList.add(UtilProperties.getMessage(resource, "CommonFtpProblemWithTransfer", UtilMisc.toMap("errorString", ioe.getMessage()), locale));
        } finally {
            if (ftp.isConnected()) {
                try {
                    ftp.disconnect();
                } catch (IOException dce) {
                    Debug.logWarning(dce, "[putFile] Problem with FTP disconnect", module);
                }
            }
        }

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            return ServiceUtil.returnError(UtilProperties.getMessage(resource, "CommonFtpFileCannotBeOpen", locale));
        }


        List<String> errorList = FastList.newInstance();


        FTPClient ftp = new FTPClient();
        try {
            ftp.connect((String) context.get("hostname"));
            if (!FTPReply.isPositiveCompletion(ftp.getReplyCode())) {
                errorList.add(UtilProperties.getMessage(resource, "CommonFtpConnectionRefused", locale));
            } else {
                String username = (String) context.get("username");
                String password = (String) context.get("password");


                if (!ftp.login(username, password)) {
                    errorList.add(UtilProperties.getMessage(resource, "CommonFtpLoginFailure", UtilMisc.toMap("username", username, "password", password), locale));
                } else {
                    Boolean binaryTransfer = (Boolean) context.get("binaryTransfer");
                    boolean binary = (binaryTransfer == null) ? false : binaryTransfer.booleanValue();
                    if (binary) { ftp.setFileType(FTP.BINARY_FILE_TYPE); }


                    Boolean passiveMode = (Boolean) context.get("passiveMode");
                    boolean passive = (passiveMode == null) ? false : passiveMode.booleanValue();
                    if (passive) { ftp.enterLocalPassiveMode(); }


                    if (!ftp.retrieveFile((String) context.get("remoteFilename"), localFile)) {
                        errorList.add(UtilProperties.getMessage(resource, "CommonFtpFileNotSentSuccesfully", UtilMisc.toMap("replyString", ftp.getReplyString()), locale));
                    }
                }
                ftp.logout();
            }
        } catch (IOException ioe) {
            errorList.add(UtilProperties.getMessage(resource, "CommonFtpProblemWithTransfer", UtilMisc.toMap("errorString", ioe.getMessage()), locale));
        } finally {
            if (ftp.isConnected()) {
                try {
                    ftp.disconnect();
                } catch (IOException dce) {
                    Debug.logWarning(dce, "[getFile] Problem with FTP disconnect", module);
                }
            }
        }

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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.getSystemName());


        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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        }
    }
    
    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) {
            // 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: {}, 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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     *         correctly.
     */
    public void execute() throws BuildException {
        checkAttributes();


        FTPClient ftp = null;


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


            ftp = new FTPClient();
            if (this.isConfigurationSet) {
                ftp = FTPConfigurator.configure(ftp, this);
            }


            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 ((this.account != null && !ftp.login(userid, password, account))
                    || (this.account == null && !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());
                }
            }


            // If an initial command was configured then send it.
            // Some FTP servers offer different modes of operation,
            // E.G. switching between a UNIX file system mode and
            // a legacy file system.
            if (this.initialSiteCommand != null) {
                RetryHandler h = new RetryHandler(this.retriesAllowed, this);
                final FTPClient lftp = ftp;
                executeRetryable(h, new Retryable() {
                    public void execute() throws IOException {
                        doSiteCommand(lftp, FTP.this.initialSiteCommand);
                    }
                }, "initial site command: " + this.initialSiteCommand);
            }




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


            if (umask != null) {
                RetryHandler h = new RetryHandler(this.retriesAllowed, this);
                final FTPClient lftp = ftp;
                executeRetryable(h, new Retryable() {
                    public void execute() throws IOException {
                        doSiteCommand(lftp, "umask " + umask);
                    }
                }, "umask " + umask);
            }


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


            if (action == MK_DIR) {
                RetryHandler h = new RetryHandler(this.retriesAllowed, this);
                final FTPClient lftp = ftp;
                executeRetryable(h, new Retryable() {
                    public void execute() throws IOException {
                        makeRemoteDir(lftp, remotedir);
                    }
                }, remotedir);
            } else if (action == SITE_CMD) {
                    RetryHandler h = new RetryHandler(this.retriesAllowed, this);
                    final FTPClient lftp = ftp;
                    executeRetryable(h, new Retryable() {
                        public void execute() throws IOException {
                            doSiteCommand(lftp, FTP.this.siteCommand);
                        }
                    }, "Site Command: " + this.siteCommand);

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