Example usage for java.nio.channels Channels newChannel

List of usage examples for java.nio.channels Channels newChannel

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Introduction

In this page you can find the example usage for java.nio.channels Channels newChannel.

Prototype

public static WritableByteChannel newChannel(OutputStream out)

Source Link

Document

Constructs a channel that writes bytes to the given stream.

Usage

From source file:byps.BWire.java

/**
 * Reads a ByteBuffer from an InputStream
 * Closes the InputStream.//from w ww.  j ava  2  s .  com
 * @param is
 * @return
 * @throws IOException
 */
public static ByteBuffer bufferFromStream(InputStream is, Boolean gzip) throws IOException {
    if (is == null)
        return null;
    try {
        ByteBuffer ibuf = ByteBuffer.allocate(10 * 1000);

        if (gzip != null) {
            if (gzip) {
                is = new GZIPInputStream(is);
            }
        } else {
            if (!is.markSupported())
                is = new BufferedInputStream(is, 2);
            is.mark(2);
            int magic = is.read() | (is.read() << 8);
            is.reset();
            if (magic == GZIPInputStream.GZIP_MAGIC) {
                is = new GZIPInputStream(is);
            }
        }

        ReadableByteChannel rch = Channels.newChannel(is);
        while (rch.read(ibuf) != -1) {
            if (ibuf.remaining() == 0) {
                ByteBuffer nbuf = ByteBuffer.allocate(ibuf.capacity() * 2);
                ibuf.flip();
                nbuf.put(ibuf);
                ibuf = nbuf;
            }
        }

        ibuf.flip();
        return ibuf;
    } finally {
        is.close();
    }
}

From source file:heigit.ors.routing.RoutingProfilesUpdater.java

private void downloadFile(String url, File destination) {
    try {//from  ww  w  .j a va 2s  .  com
        URL website = new URL(url);
        ReadableByteChannel rbc = Channels.newChannel(website.openStream());
        FileOutputStream fos = new FileOutputStream(destination);
        fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
        fos.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

From source file:StreamUtil.java

/**
 * Copies the content read from InputStream to OutputStream. Uses the NIO Channels to copy.
 * @param is The InputStream that is read.
 * @param os The OutputStream where the data is written.
 * @throws IOException//w w  w .  j a  v  a 2  s  .co  m
 */
public static void copy(final InputStream is, final OutputStream os) throws IOException {
    final ReadableByteChannel inChannel = Channels.newChannel(is);
    final WritableByteChannel outChannel = Channels.newChannel(os);

    try {
        final ByteBuffer buffer = ByteBuffer.allocate(65536);
        while (true) {
            int bytesRead = inChannel.read(buffer);
            if (bytesRead == -1)
                break;
            buffer.flip();
            while (buffer.hasRemaining())
                outChannel.write(buffer);
            buffer.clear();
        }
    } finally {
        try {
            inChannel.close();
        } catch (IOException ex) {
            LOG.log(Level.SEVERE, null, ex);
        }
        try {
            outChannel.close();
        } catch (IOException ex) {
            LOG.log(Level.SEVERE, null, ex);
        }
    }
}

From source file:eu.itesla_project.dymola.DymolaAdaptersMatParamsWriter.java

private void writeMLArrayToPath(Path fPath, List<MLArray> mlarray) throws IOException {
    try (OutputStream w = Files.newOutputStream(fPath)) {
        //using Writable channel to make it work both for 'standard' and shrinkwrap based filesystems
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        WritableByteChannel wbc = Channels.newChannel(baos);
        new MatFileWriter(wbc, mlarray);
        w.write(baos.toByteArray());//  w w  w. j a v a 2  s.co  m
    }
}

From source file:edu.usc.pgroup.floe.client.FloeClient.java

/**
 * Uploads the file to the coordinator./*from w ww  .  jav  a2s .  co m*/
 * The file is uploaded relative to the coordinator's scratch folder.
 *
 * @param fileName name of the file to be stored on the coordinator.
 * @return the base fileName which may be used for downloading the file
 * later.
 */
public final String uploadFileSync(final String fileName) {
    String baseFile = FilenameUtils.getName(fileName);
    try {
        int fid = getClient().beginFileUpload(baseFile);
        ReadableByteChannel inChannel = Channels.newChannel(new FileInputStream(fileName));
        ByteBuffer buffer = ByteBuffer.allocate(Utils.Constants.BUFFER_SIZE);
        while (inChannel.read(buffer) > 0) {
            buffer.flip();
            getClient().uploadChunk(fid, buffer);
            buffer.clear();
        }
        inChannel.close();
        getClient().finishUpload(fid);
    } catch (TException e) {
        LOGGER.error(e.getMessage());
        throw new RuntimeException(e);
    } catch (FileNotFoundException e) {
        LOGGER.error(e.getMessage());
        throw new RuntimeException(e);
    } catch (IOException e) {
        LOGGER.error(e.getMessage());
        throw new RuntimeException(e);
    }
    return baseFile;
}

From source file:org.geowebcache.service.kml.KMZHelper.java

/**
 * Writes two byte[] into a zip/*from  w w w  . j  a v a2s  .c  o m*/
 * -> like a zipfile with two files
 * 
 * @param namePfx prefix for files inside file
 * @param overlay
 * @param data
 * @param out
 * @throws IOException
 */
private static void writeZippedKML(String namePfx, String formatExtension, byte[] overlay, Resource data,
        OutputStream out) throws IOException {

    ZipOutputStream zipos = new ZipOutputStream(out);
    // High compression
    //zipos.setLevel(9);

    // Add the overlay, links to the next content
    ZipEntry zeOl = new ZipEntry("netlinks_" + namePfx + ".kml");
    zipos.putNextEntry(zeOl);
    zipos.write(overlay);

    // Add the actual data, if applicable
    if (data != null) {
        ZipEntry zeData = new ZipEntry("data_" + namePfx + "." + formatExtension);
        zipos.putNextEntry(zeData);
        WritableByteChannel outch = Channels.newChannel(zipos);
        data.transferTo(outch);
    }
    zipos.finish();
}

From source file:com.spectralogic.ds3client.commands.GetObjectRequest.java

public GetObjectRequest(final String bucketName, final String objectName, final String job, final long offset,
        @Nonnull final OutputStream stream) {
    Preconditions.checkNotNull(stream, "Stream may not be null.");
    this.bucketName = bucketName;
    this.objectName = objectName;
    this.job = job;
    this.offset = offset;
    this.channel = Channels.newChannel(stream);

    this.updateQueryParam("job", job);

    this.updateQueryParam("offset", offset);

}

From source file:com.github.neoio.net.message.staging.memory.MemoryMessageStaging.java

@Override
protected ReadableByteChannel getPrimaryStageChannel() {
    return Channels.newChannel(new ByteArrayInputStream(primaryStage.toByteArray()));
}

From source file:com.cloud.maint.UpgradeManagerImpl.java

public String deployNewAgent(String url) {
    s_logger.info("Updating agent with binary from " + url);

    final HttpClient client = new HttpClient(s_httpClientManager);
    final GetMethod method = new GetMethod(url);
    int response;
    File file = null;//from  w  w  w . j  a  va  2 s  . c o  m
    try {
        response = client.executeMethod(method);
        if (response != HttpURLConnection.HTTP_OK) {
            s_logger.warn("Retrieving the agent gives response code: " + response);
            return "Retrieving the file from " + url + " got response code: " + response;
        }

        final InputStream is = method.getResponseBodyAsStream();
        file = File.createTempFile("agent-", "-" + Long.toString(new Date().getTime()));
        file.deleteOnExit();

        s_logger.debug("Retrieving new agent into " + file.getAbsolutePath());

        final FileOutputStream fos = new FileOutputStream(file);

        final ByteBuffer buffer = ByteBuffer.allocate(2048);
        final ReadableByteChannel in = Channels.newChannel(is);
        final WritableByteChannel out = fos.getChannel();

        while (in.read(buffer) != -1) {
            buffer.flip();
            out.write(buffer);
            buffer.clear();
        }

        in.close();
        out.close();

        s_logger.debug("New Agent zip file is now retrieved");
    } catch (final HttpException e) {
        return "Unable to retrieve the file from " + url;
    } catch (final IOException e) {
        return "Unable to retrieve the file from " + url;
    } finally {
        method.releaseConnection();
    }

    file.delete();

    return "File will be deployed.";
}

From source file:com.hortonworks.amstore.view.AmbariStoreHelper.java

public static void downloadFile(String url, String localFilePath) {

    try {/*from  w  ww  . ja v  a  2s .  c  o  m*/
        URL website = new URL(url);
        ReadableByteChannel rbc = Channels.newChannel(website.openStream());
        // unix specific
        FileOutputStream fos = new FileOutputStream(localFilePath);
        fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE);
        fos.close();
    } catch (java.net.MalformedURLException e) {
    } catch (java.io.FileNotFoundException e) {
    } catch (java.io.IOException e) {
    }
}