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

        }
        InputStream input = null;
        OutputStream output = null;


        res.sampleStart();
        FTPClient ftp = new FTPClient();
        try {
            savedClient = ftp;
            final int port = getPortAsInt();
            if (port > 0){
                ftp.connect(getServer(),port);                
            } else {
                ftp.connect(getServer());
            }
            res.latencyEnd();
            int reply = ftp.getReplyCode();
            if (FTPReply.isPositiveCompletion(reply))
            {
                if (ftp.login( getUsername(), getPassword())){
                    if (binaryTransfer) {
                        ftp.setFileType(FTP.BINARY_FILE_TYPE);
                    }
                    ftp.enterLocalPassiveMode();// should probably come from the setup dialog
                    boolean ftpOK=false;
                    if (isUpload()) {
                        String contents=getLocalFileContents();
                        if (contents.length() > 0){
                            byte bytes[] = contents.getBytes();// TODO this assumes local encoding
                            input = new ByteArrayInputStream(bytes);
                            res.setBytes(bytes.length);
                        } else {
                            File infile = new File(local);
                            res.setBytes((int)infile.length());
                            input = new FileInputStream(infile);
                        }
                        ftpOK = ftp.storeFile(remote, input);
                    } else {
                        final boolean saveResponse = isSaveResponse();
                        ByteArrayOutputStream baos=null; // No need to close this
                        OutputStream target=null; // No need to close this
                        if (saveResponse){
                            baos  = new ByteArrayOutputStream();
                            target=baos;
                        }
                        if (local.length()>0){
                            output=new FileOutputStream(local);
                            if (target==null) {
                                target=output;
                            } else {
                                target = new TeeOutputStream(output,baos);
                            }
                        }
                        if (target == null){
                            target=new NullOutputStream();
                        }
                        input = ftp.retrieveFileStream(remote);
                        if (input == null){// Could not access file or other error
                            res.setResponseCode(Integer.toString(ftp.getReplyCode()));
                            res.setResponseMessage(ftp.getReplyString());
                        } else {
                            long bytes = IOUtils.copy(input,target);
                            ftpOK = bytes > 0;
                            if (saveResponse && baos != null){
                                res.setResponseData(baos.toByteArray());
                                if (!binaryTransfer) {
                                    res.setDataType(SampleResult.TEXT);
                                }
                            } else {
                                res.setBytes((int) bytes);
                            }
                        }
                    }


                    if (ftpOK) {
                        res.setResponseCodeOK();
                        res.setResponseMessageOK();
                        res.setSuccessful(true);
                    } else {
                        res.setResponseCode(Integer.toString(ftp.getReplyCode()));
                        res.setResponseMessage(ftp.getReplyString());
                    }
                } else {
                    res.setResponseCode(Integer.toString(ftp.getReplyCode()));
                    res.setResponseMessage(ftp.getReplyString());
                }
            } else {
                res.setResponseCode("501"); // TODO
                res.setResponseMessage("Could not connect");
                //res.setResponseCode(Integer.toString(ftp.getReplyCode()));
                res.setResponseMessage(ftp.getReplyString());
            }
        } catch (IOException ex) {
            res.setResponseCode("000"); // TODO
            res.setResponseMessage(ex.toString());
        } finally {
            savedClient = null;
            if (ftp.isConnected()) {
                try {
                    ftp.logout();
                } catch (IOException ignored) {
                }
                try {
                    ftp.disconnect();
                } catch (IOException ignored) {
                }
            }
            IOUtils.closeQuietly(input);
            IOUtils.closeQuietly(output);

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        return res;
    }


    /** {@inheritDoc} */
    public boolean interrupt() {
        FTPClient client = savedClient;
        if (client != null) {
            savedClient = null;
            try {
                client.abort();
                client.disconnect();
            } catch (IOException ignored) {
            }
        }
        return client != null;
    }

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    /**
     * @see java.net.URLConnection#getInputStream()
     */
    public InputStream getInputStream() throws IOException {
        FTPClient client = new FTPClient();
        client.connect(host);
        String replyString = client.getReplyString();
        int replyCode = client.getReplyCode();
        if (!FTPReply.isPositiveCompletion(replyCode)) {
            client.disconnect();
            throw new IOException(replyString);
        }
        if (!client.login(username, password)) {
            replyString = client.getReplyString();
            client.logout();
            throw new IOException(replyString);
        }
        client.setFileType(FTP.BINARY_FILE_TYPE);
        client.enterLocalPassiveMode();


        final ByteArrayOutputStream os = new ByteArrayOutputStream();
        try {
            client.retrieveFile(path, os);
            client.logout();
        } finally {
            client.disconnect();
        }
        return new ByteArrayInputStream(os.toByteArray());
    }

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        this.user = (String) workItem.getParameter("User");
        this.password = (String) workItem.getParameter("Password");
        this.filePath = (String) workItem.getParameter("FilePath");
        
        client = new FTPClient();
        try {
            if(connection != null){
                client.connect(connection.getHost(), Integer.parseInt(connection.getPort()));
                int reply = client.getReplyCode();

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        cryptoUtil.process(c);
        LOG.info("*****load from server done******");
        assertTrue(FileUtils.contentEquals(new File(from.getPath()), new File(response.getPath())));
        LOG.info("*****assert files done******");
        new File(prefix + "2.pdf").delete();
        FTPClient client = new FTPClient();
        client.connect(readConfig.getUrl());
        client.login(readConfig.getLogin(), readConfig.getPass());
        client.deleteFile("~/backup/1/1.pdf");
        client.disconnect();
        LOG.info("*****clean directories done******\n");
    }

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    }


    private static Log log = LogFactory.getLog(FileUtilFtpImpl.class);


    public byte[] read() throws IOException {
        FTPClient client = getClient();
        client.setFileType(FTPClient.BINARY_FILE_TYPE);
        String[] pathes = this.getPath().replaceAll("\\\\", "/").split("/");
        String filename = pathes[pathes.length - 1];
        cwdFtpTo(client, true);
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        client.retrieveFile(filename, outputStream);
        outputStream.close();
        byte buffer[] = outputStream.toByteArray();
        client.disconnect();
        log.debug("read ftp done");
        return buffer;
    }

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        log.debug("read ftp done");
        return buffer;
    }


    protected FTPClient getClient() throws IOException {
        FTPClient client = new FTPClient();
        log.debug("connect to host " + getHost());
        client.connect(getHost());
        log.debug("login using username " + getUsername());
        if (!client.login(getUsername(), getPassword())){
            throw new IOException("user is not login, code " + client.getReplyCode() + ", message: " + client.getReplyString());
        }
        return client;
    }

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        return client;
    }


    public void write(String filename, byte[] data) throws IOException {
        log.debug("FTP WRITE: to = " + this + ", filename = " + filename + ", data.length = " + data.length);
        FTPClient client = getClient();
        client.setFileType(FTPClient.BINARY_FILE_TYPE);
        cwdFtpTo(client, true);
        if (filename.isEmpty()) {
            filename = getPath().substring(getPath().lastIndexOf('/') + 1);
            log.debug("FTP WRITE: new filename = '" + filename + "'");
        }
        log.debug("rescheck if file exist");
        int size = 0;
        FTPFile[] files = client.listFiles();
        for (FTPFile i : files) {
            if (i.getName().equals(filename)) {
                log.debug("File " + i.getName() + " exist, appending");
                if (i.getSize() > Integer.MAX_VALUE) {
                    log.error("Sorry, we not support files bigger than " + Integer.MAX_VALUE + " bytes");
                    throw new RuntimeException("Sorry, we not support files bigger than " + Integer.MAX_VALUE + " bytes");
                }
                size = (int) i.getSize();
            }
        }
        log.debug("FTP WRITE STARTED");
        long start = System.currentTimeMillis();
        log.trace("clientappendfile=" + client.appendFile(filename, new ByteArrayInputStream(data, size, data.length - size)));
        log.trace("client responce code:" + client.getReplyCode() + ", string:" + client.getReplyString());
        long end = System.currentTimeMillis();
        log.debug("FTP WRITE FINISHED, time = " + (end - start) + ", speed: " + ((data.length * 1000) / (128 * (end - start))) + "kbps");
        if (client.getReplyCode() != 226) {
            log.error("client error code:" + client.getReplyCode() + ", string:" + client.getReplyString());
            throw new IOException(client.getReplyString());
        }
        client.disconnect();
        log.trace("save to ftp done");
    }

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        return true;
    }


    public boolean exists() throws IOException {
        log.debug("exist  : " + this);
        FTPClient client = getClient();
        String[] pathes = getPath().replaceAll("\\\\", "/").split("/");
        boolean find = false;
        if (pathes.length > 0) {
            for (int i = 0; i < pathes.length - 1; i++){
                log.trace("Ftp client: we at: " + client.printWorkingDirectory() + ", go to \'" + pathes[i] + "'");
                int reply = client.cwd(pathes[i]);
                if (reply >= 400) {
                    log.warn("exist cwd " + pathes[i] + " responce code : " + client.getReplyCode() + ", reply: " + client.getReplyString());
                    return false;
                }
                log.trace("exist responce code : " + client.getReplyCode() + ", reply: " + client.getReplyString());
                
            }
            FTPFile files[] = client.listFiles();
            for (FTPFile f : files) {
                if (f != null) {
                    find |= pathes[pathes.length - 1].equals(f.getName());
                } else {
                    log.warn("exist: listfiles() return null");

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    public boolean isDirectory() throws IOException {
        String normalizedTo = getPath().replaceAll("\\\\", "/");
        boolean isDirectory = normalizedTo.charAt(normalizedTo.length() - 1) == '/';
        if (isDirectory == true)
            return true;
        FTPClient client = getClient();
        isDirectory = cwdFtpTo(client, false);
        if (isDirectory == false) {
            client.disconnect();
            return isDirectory;
        } else {
            isDirectory = client.changeWorkingDirectory(normalizedTo.split("/")[normalizedTo.split("/").length - 1]);
            client.disconnect();
            return isDirectory;
        }
    }

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