Example usage for java.nio.channels FileChannel write

List of usage examples for java.nio.channels FileChannel write

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Introduction

In this page you can find the example usage for java.nio.channels FileChannel write.

Prototype

public final long write(ByteBuffer[] srcs) throws IOException

Source Link

Document

Writes a sequence of bytes to this channel from the given buffers.

Usage

From source file:org.wso2.carbon.mediation.library.service.upload.LibraryUploader.java

private void writeResource(DataHandler dataHandler, String tempDestPath, String destPath, String fileName)
        throws IOException {

    File tempDestFile = new File(tempDestPath, fileName);
    FileChannel out = null;
    FileChannel in = null;//from   w w  w .j  a  va 2 s.  co m
    FileOutputStream fos = null;

    try {
        fos = new FileOutputStream(tempDestFile);
        dataHandler.writeTo(fos);
        fos.flush();

        /* File stream is copied to a temp directory in order handle hot deployment issue
           occurred in windows */
        dataHandler.writeTo(fos);
        out = new FileOutputStream(destPath + File.separator + fileName).getChannel();
        in = new FileInputStream(tempDestFile).getChannel();
        out.write(in.map(FileChannel.MapMode.READ_ONLY, 0, in.size()));
    } finally {
        try {
            if (out != null) {
                out.close();
            }
        } catch (IOException e) {
            log.warn("Can't close file streams.", e);
        }
        try {
            if (in != null) {
                in.close();
            }
        } catch (IOException e) {
            log.warn("Can't close file streams.", e);
        }
        try {
            if (fos != null) {
                fos.close();
            }
        } catch (IOException e) {
            log.warn("Can't close file streams.", e);
        }
    }

    if (!tempDestFile.delete()) {
        if (log.isDebugEnabled()) {
            log.debug("temp file: " + tempDestFile.getAbsolutePath()
                    + " deletion failed, scheduled deletion on server exit.");
        }
        tempDestFile.deleteOnExit();
    }
}

From source file:org.apache.camel.component.file.FileOperations.java

private void writeFileByStream(InputStream in, File target) throws IOException {
    FileChannel out = null;
    try {/*  w w  w  . j  ava  2 s . c om*/
        out = prepareOutputFileChannel(target, out);

        if (LOG.isTraceEnabled()) {
            LOG.trace("Using InputStream to transfer from: " + in + " to: " + out);
        }
        int size = endpoint.getBufferSize();
        byte[] buffer = new byte[size];
        ByteBuffer byteBuffer = ByteBuffer.wrap(buffer);
        int bytesRead;
        while ((bytesRead = in.read(buffer)) != -1) {
            if (bytesRead < size) {
                byteBuffer.limit(bytesRead);
            }
            out.write(byteBuffer);
            byteBuffer.clear();
        }
    } finally {
        IOHelper.close(in, target.getName(), LOG);
        IOHelper.close(out, target.getName(), LOG);
    }
}

From source file:org.apache.hadoop.yarn.server.security.CertificateLocalizationService.java

private void writeX509ToLocalFS(ByteBuffer keyStore, File keyStoreLocation, ByteBuffer trustStore,
        File trustStoreLocation, String password, File passwordFileLocation) throws IOException {
    FileChannel keyStoreChannel = new FileOutputStream(keyStoreLocation, false).getChannel();
    keyStoreChannel.write(keyStore);
    keyStoreChannel.close();//from w  w w. ja v a 2 s .c  o m

    FileChannel trustStoreChannel = new FileOutputStream(trustStoreLocation, false).getChannel();
    trustStoreChannel.write(trustStore);
    trustStoreChannel.close();

    FileUtils.writeStringToFile(passwordFileLocation, password);
}

From source file:it.geosolutions.opensdi2.service.impl.FileUploadServiceImpl.java

/**
 * Create a temporal file with a byte array
 * /*ww w . j av  a 2s .c om*/
 * @param key of the file
 * @param bytes to write
 * @param i index by the file name
 * @return absolute path to the file
 * @throws IOException
 */
public String createTemporalFile(String key, byte[] bytes, int i) throws IOException {

    String filePath = temporaryFolder + File.separator + key;

    try {

        // write bytes
        File tmpFile = new File(filePath);

        if (LOGGER.isTraceEnabled()) {
            LOGGER.trace("Appending bytes to " + tmpFile.getAbsolutePath());
        }

        // File channel to append bytes
        @SuppressWarnings("resource")
        FileChannel channel = new FileOutputStream(tmpFile, true).getChannel();
        ByteBuffer buf = ByteBuffer.allocateDirect((int) bytes.length);

        // put bytes
        buf.put(bytes);

        // Flips this buffer.  The limit is set to the current position and then
        // the position is set to zero.  If the mark is defined then it is discarded.
        buf.flip();

        // Writes a sequence of bytes to this channel from the given buffer.
        channel.write(buf);

        // close the channel
        channel.close();

    } catch (IOException e) {
        LOGGER.error("Error writing file bytes", e);
    }

    return filePath;
}

From source file:org.neo4j.io.pagecache.impl.SingleFilePageSwapper.java

private long lockPositionWriteVector(long filePageId, FileChannel channel, long fileOffset, ByteBuffer[] srcs)
        throws IOException {
    try {//from  w  w w.ja  va  2  s  .  c om
        long toWrite = filePageSize * (long) srcs.length;
        long bytesWritten = 0;
        synchronized (positionLock(channel)) {
            channel.position(fileOffset);
            do {
                bytesWritten += channel.write(srcs);
            } while (bytesWritten < toWrite);
            return bytesWritten;
        }
    } catch (ClosedChannelException e) {
        // AsynchronousCloseException is a subclass of
        // ClosedChannelException, and ClosedByInterruptException is in
        // turn a subclass of AsynchronousCloseException.
        tryReopen(filePageId, e);
        boolean interrupted = Thread.interrupted();
        // Recurse because this is hopefully a very rare occurrence.
        channel = unwrappedChannel(filePageId);
        long bytesWritten = lockPositionWriteVector(filePageId, channel, fileOffset, srcs);
        if (interrupted) {
            Thread.currentThread().interrupt();
        }
        return bytesWritten;
    }
}

From source file:eu.stratosphere.nephele.services.iomanager.IOManagerPerformanceBenchmark.java

@SuppressWarnings("resource")
private final void speedTestNIO(int bufferSize, boolean direct) throws IOException {
    final Channel.ID tmpChannel = ioManager.createChannel();

    File tempFile = null;//from   www. j  ava  2 s.c  o m
    FileChannel fs = null;

    try {
        tempFile = new File(tmpChannel.getPath());

        RandomAccessFile raf = new RandomAccessFile(tempFile, "rw");
        fs = raf.getChannel();

        ByteBuffer buf = direct ? ByteBuffer.allocateDirect(bufferSize) : ByteBuffer.allocate(bufferSize);

        long writeStart = System.currentTimeMillis();

        int valsLeft = NUM_INTS_WRITTEN;
        while (valsLeft-- > 0) {
            if (buf.remaining() < 4) {
                buf.flip();
                fs.write(buf);
                buf.clear();
            }
            buf.putInt(valsLeft);
        }

        if (buf.position() > 0) {
            buf.flip();
            fs.write(buf);
        }

        fs.close();
        raf.close();
        fs = null;

        long writeElapsed = System.currentTimeMillis() - writeStart;

        // ----------------------------------------------------------------

        raf = new RandomAccessFile(tempFile, "r");
        fs = raf.getChannel();
        buf.clear();

        long readStart = System.currentTimeMillis();

        fs.read(buf);
        buf.flip();

        valsLeft = NUM_INTS_WRITTEN;
        while (valsLeft-- > 0) {
            if (buf.remaining() < 4) {
                buf.compact();
                fs.read(buf);
                buf.flip();
            }
            if (buf.getInt() != valsLeft) {
                throw new IOException();
            }
        }

        fs.close();
        raf.close();

        long readElapsed = System.currentTimeMillis() - readStart;

        LOG.info("NIO Channel with buffer " + bufferSize + ": write " + writeElapsed + " msecs, read "
                + readElapsed + " msecs.");
    } finally {
        // close if possible
        if (fs != null) {
            fs.close();
            fs = null;
        }
        // try to delete the file
        if (tempFile != null) {
            tempFile.delete();
        }
    }
}

From source file:eu.stratosphere.nephele.taskmanager.runtime.EnvelopeConsumptionLog.java

private void writeAnnouncedEnvelopesBufferToDisk() {

    FileChannel fc = null;

    try {//  w  ww. ja  v  a  2s.  c o  m

        this.announcedEnvelopesAsIntBuffer.flip();
        this.announcedEnvelopesAsByteBuffer
                .position(this.announcedEnvelopesAsIntBuffer.position() * SIZE_OF_INTEGER);
        this.announcedEnvelopesAsByteBuffer.limit(this.announcedEnvelopesAsIntBuffer.limit() * SIZE_OF_INTEGER);

        fc = new FileOutputStream(this.logFile, true).getChannel();

        while (this.announcedEnvelopesAsByteBuffer.hasRemaining()) {
            fc.write(this.announcedEnvelopesAsByteBuffer);
        }

    } catch (IOException ioe) {
        LOG.error(StringUtils.stringifyException(ioe));
    } finally {

        if (fc != null) {
            try {
                fc.close();
            } catch (IOException ioe) {
            }
        }

        this.announcedEnvelopesAsIntBuffer.clear();
        this.announcedEnvelopesAsByteBuffer.clear();
    }

}

From source file:dk.statsbiblioteket.util.LineReaderTest.java

public void testNIO() throws Exception {
    byte[] INITIAL = new byte[] { 1, 2, 3, 4 };
    byte[] EXTRA = new byte[] { 5, 6, 7, 8 };
    byte[] FULL = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 };
    byte[] FIFTH = new byte[] { 87 };
    byte[] FULL_WITH_FIFTH = new byte[] { 1, 2, 3, 4, 87, 6, 7, 8 };

    // Create temp-file with content
    File temp = createTempFile();
    FileOutputStream fileOut = new FileOutputStream(temp, true);
    fileOut.write(INITIAL);//ww  w  .  j av a 2s.  co m
    fileOut.close();

    checkContent("The plain test-file should be correct", temp, INITIAL);
    {
        // Read the 4 bytes
        RandomAccessFile input = new RandomAccessFile(temp, "r");
        FileChannel channelIn = input.getChannel();
        ByteBuffer buffer = ByteBuffer.allocate(4096);
        channelIn.position(0);
        assertEquals("Buffer read should read full length", INITIAL.length, channelIn.read(buffer));
        buffer.position(0);

        checkContent("Using buffer should produce the right bytes", INITIAL, buffer);
        channelIn.close();
        input.close();
    }
    {
        // Fill new buffer
        ByteBuffer outBuffer = ByteBuffer.allocate(4096);
        outBuffer.put(EXTRA);
        outBuffer.flip();
        assertEquals("The limit of the outBuffer should be correct", EXTRA.length, outBuffer.limit());

        // Append new buffer to end
        RandomAccessFile output = new RandomAccessFile(temp, "rw");
        FileChannel channelOut = output.getChannel();
        channelOut.position(INITIAL.length);
        assertEquals("All bytes should be written", EXTRA.length, channelOut.write(outBuffer));
        channelOut.close();
        output.close();
        checkContent("The resulting file should have the full output", temp, FULL);
    }

    {
        // Fill single byte buffer
        ByteBuffer outBuffer2 = ByteBuffer.allocate(4096);
        outBuffer2.put(FIFTH);
        outBuffer2.flip();
        assertEquals("The limit of the second outBuffer should be correct", FIFTH.length, outBuffer2.limit());

        // Insert byte in the middle
        RandomAccessFile output2 = new RandomAccessFile(temp, "rw");
        FileChannel channelOut2 = output2.getChannel();
        channelOut2.position(4);
        assertEquals("The FIFTH should be written", FIFTH.length, channelOut2.write(outBuffer2));
        channelOut2.close();
        output2.close();
        checkContent("The resulting file with fifth should be complete", temp, FULL_WITH_FIFTH);
    }
}

From source file:sos.scheduler.editor.app.WebDavDialogListener.java

public void deleteProfile(String profilename) throws Exception {
    try {//  w  w  w  .  ja  v a  2s.  co m
        setCurrProfileName(profilename);
        //java.util.Properties profile = getCurrProfile();
        String filename = configFile;

        byte[] b = getBytesFromFile(new File(filename));
        String s = new String(b);
        //System.out.println(s);

        int pos1 = s.indexOf("[" + PREFIX + " " + profilename + "]");
        int pos2 = s.indexOf("[", pos1 + 1);

        if (pos1 == -1) {
            //System.out.println("profile nicht gefunden");
            pos1 = s.length();
            pos2 = -1;
            return;
        }

        if (pos2 == -1)
            pos2 = s.length();

        String s2 = s.substring(0, pos1) + s.substring(pos2);

        java.nio.ByteBuffer bbuf = java.nio.ByteBuffer.wrap(s2.getBytes());

        java.io.File file = new java.io.File(filename);

        boolean append = false;

        java.nio.channels.FileChannel wChannel = new java.io.FileOutputStream(file, append).getChannel();

        wChannel.write(bbuf);

        wChannel.close();

    } catch (java.io.IOException e) {

        try {
            new ErrorLog("error in " + sos.util.SOSClassUtil.getMethodName() + " ; could not delete profile="
                    + profilename, e);
        } catch (Exception ee) {
            //tu nichts
        }
        hasError = true;
        throw new Exception(e.getMessage());

    } finally {

        cboConnectname.setItems(getProfileNames());
        cboConnectname.setText(currProfileName);
        txtURL.setText(currProfile.getProperty("url"));
    }

}