Examples of java.nio.channels.FileChannel.transferTo()

java.nio.channels.FileChannel.transferTo()
Transfers data from the file to the given channel. It may be very efficient. By invoking this methid, it will read form the file and write into the writable channel. Note: no guarantee whether all bytes may be transfered.And it does not modify the position of the channel. @param position the non-negative position to begin @param count the non-negative bytes to be transferred @param target the target channel to write into @return the number of bytes that were transferred. @throws IllegalArgumentException If the parameters are not correct @throws NonReadableChannelException If this channel is not readable @throws NonWritableChannelException If the target channel is not writable @throws ClosedChannelException If either channel has already been closed @throws AsynchronousCloseException If either channel is closed by other threads during this operation @throws ClosedByInterruptException If the thread is interrupted during this operation @throws IOException If any I/O error occurs


        try {   
          
             in = new FileInputStream(source).getChannel();
             out = new FileOutputStream(dest).getChannel();
             in.transferTo( 0, in.size(), out);
            
        } catch (Exception e) {
            throw new MessageStoreException("failed to copy email {src='"+source+"=',dest='"+dest+"'",e,logger);
        } finally {
             if (in != null) try { in.close(); } catch (Exception e) {};

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        try {   
          
             in = new FileInputStream(source).getChannel();
             out = new FileOutputStream(dest).getChannel();
             in.transferTo( 0, in.size(), out);
            
        } catch (Exception e) {
            throw new MessageStoreException("failed to copy email {src='"+source+"=',dest='"+dest+"'",logger);
        } finally {
             if (in != null) try { in.close(); } catch (Exception e) {};

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            try
            {
                FileChannel target = ((FileOutputStream) output).getChannel();
                FileChannel source = ((FileInputStream) input).getChannel();
                
                source.transferTo(0, Integer.MAX_VALUE, target);
                
                source.close();
                target.close();
                
                return;

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        try {   
          
             in = new FileInputStream(source).getChannel();
             out = new FileOutputStream(dest).getChannel();
             in.transferTo( 0, in.size(), out);
            
        } catch (Exception e) {
            throw new MessageStoreException("failed to copy email {src='"+source+"=',dest='"+dest+"'",e,logger);
        } finally {
             if (in != null) try { in.close(); } catch (Exception e) {};

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            for (Pair<Long, Long> section : header.getStreamFile().sections)
            {
                long length = section.right - section.left;
                long bytesTransferred = 0;
                while (bytesTransferred < length)
                    bytesTransferred += fc.transferTo(section.left + bytesTransferred, length - bytesTransferred, channel);
                if (logger.isDebugEnabled())
                    logger.debug("Bytes transferred " + bytesTransferred);
            }
        }
        finally

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                    if (handler.isFailed()) {
                        LOGGER.debug("Stalled error");
                        throw new FileUploadStalledException();
                    }
                    try {
                        nWrite = fc.transferTo(fileLength, l, target);


                        if (nWrite == 0) {
                            LOGGER.info("Waiting for writing...");
                            try {
                                fc.wait(50);

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            targetFileChannel = exchange.getConnection().getWorker().getXnio().openFile(tempTarget, FileAccess.READ_WRITE);
            sourceFileChannel = exchange.getConnection().getWorker().getXnio().openFile(file, FileAccess.READ_ONLY);


            StreamSinkConduit conduit = encoding.getEncoding().getResponseWrapper().wrap(new ImmediateConduitFactory<StreamSinkConduit>(new FileConduitTarget(targetFileChannel, exchange)), exchange);
            final ConduitStreamSinkChannel targetChannel = new ConduitStreamSinkChannel(null, conduit);
            long transfered = sourceFileChannel.transferTo(0, resource.getContentLength(), targetChannel);
            targetChannel.shutdownWrites();
            org.xnio.channels.Channels.flushBlocking(targetChannel);
            if (transfered != resource.getContentLength()) {
                UndertowLogger.REQUEST_LOGGER.error("Failed to write pre-cached file");
            }

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                out = Channels.newChannel(os);
            }
            FileChannel fc = s.getChannel();
            long pos = 0;
            while (pos < len) {
                long i = fc.transferTo(pos, len - pos, out);
                pos += i;
            }
            s.close();
        } else {
            IOHelper.copy(getInputStream(), os);

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            FileChannel in = new FileInputStream(fileToUpload).getChannel();
            URLConnection connection = url.openConnection();
            connection.setDoOutput(true);
            connection.setRequestProperty("Authorization", "Basic " + Base64Encoder.encode(user + ":" + password));
            WritableByteChannel out = Channels.newChannel(connection.getOutputStream());
            in.transferTo(0, fileToUpload.length(), out);


            if (connection instanceof HttpURLConnection) {
                int code = ((HttpURLConnection) connection).getResponseCode();
                if (code < 200 || code >= 300) {
                    LOG.warn(String.format("Got response code %s while uploading %s to fabric8 maven repo: %s", code, fileToUpload.getPath(), url));

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                out = Channels.newChannel(os);
            }
            FileChannel fc = s.getChannel();
            long pos = 0;
            while (pos < len) {
                long i = fc.transferTo(pos, len - pos, out);
                pos += i;
            }
            s.close();
            fc.close();
        } else {

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