Example usage for java.io FileInputStream getChannel

Introduction

In this page you can find the example usage for java.io FileInputStream getChannel.

Prototype

public FileChannel getChannel() 

Source Link

Document

Returns the unique java.nio.channels.FileChannel FileChannel object associated with this file input stream.

Usage

From source file:org.xlcloud.service.manager.VirtualClusterTemplateManagerImpl.java

private static String readFile(String path) throws IOException, FileNotFoundException {
    FileInputStream stream = new FileInputStream(new File(path));
    try {//from   w  w  w.  java2  s  .c  om
        FileChannel fc = stream.getChannel();
        MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());

        return Charset.defaultCharset().decode(bb).toString();
    } finally {
        stream.close();
    }
}

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From source file:org.apache.hadoop.hdfs.client.ClientMmap.java

public static ClientMmap load(ClientMmapManager manager, FileInputStream in, ExtendedBlock block,
        DatanodeID datanodeID) throws IOException {
    MappedByteBuffer map = in.getChannel().map(MapMode.READ_ONLY, 0, in.getChannel().size());
    return new ClientMmap(manager, map, block, datanodeID);
}

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From source file:Main.java

public static File copyFileTo(File src, File dst) {
    FileChannel in = null;//from   w w w.j  a va 2s .c om
    FileChannel out = null;
    FileInputStream inStream = null;
    FileOutputStream outStream = null;
    try {
        inStream = new FileInputStream(src);
        outStream = new FileOutputStream(dst);
        in = inStream.getChannel();
        out = outStream.getChannel();
        in.transferTo(0, in.size(), out);
    } catch (IOException e) {
        e.printStackTrace();
        return null;
    } finally {
        try {
            if (in != null) {
                in.close();
            }
            if (out != null) {
                out.close();
            }
            if (inStream != null) {
                inStream.close();
            }
            if (outStream != null) {
                outStream.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    return dst;
}

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From source file:Main.java

/**
 * This method handels the reading of data from a specific file.
 * //  w w w .  j ava  2 s. c  o m
 * @param file the file, to read from.
 * @param blockSize the length of the data-block, which should be read from the specified file.
 * @return the data read from the file.
 */
public static byte[] readFile(File file, long blockSize) {
    FileInputStream fis;
    byte[] fileContent = null;

    try {
        fis = new FileInputStream(file);

        FileChannel fileChannel = fis.getChannel();

        int bytesToRead;
        fileChannel.position(readStreamPosition);

        int dataLen = fis.available();

        // if there is a zero block size specified, read the whole file
        if (blockSize == 0L) {
            bytesToRead = dataLen;
        } else {
            bytesToRead = (int) blockSize;
        }

        fileContent = new byte[bytesToRead];

        // reading the data
        for (int i = 0; i < bytesToRead; i++) {
            fileContent[i] = (byte) fis.read();
        }

        // storing read-position
        readStreamPosition = fileChannel.position();

        fis.close();
        fileChannel.close();

        // zero blockSize indicates, that reading of this file is completed,
        // stream position reset
        if (blockSize == 0L) {
            readStreamPosition = 0L;
        }
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

    return fileContent;
}

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From source file:edu.usf.cutr.siri.SiriParserJacksonExample.java

/**
 * Read in input file to string//from   w w  w  .j  av  a  2s. c o  m
 * @param file file containing the JSON or XML data
 * @return String representation of the JSON or XML file
 * @throws IOException
 */
private static String readFile(File file) throws IOException {
    FileInputStream stream = new FileInputStream(file);
    try {
        FileChannel fc = stream.getChannel();
        MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
        return Charset.defaultCharset().decode(bb).toString();
    } finally {
        stream.close();
    }
}

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From source file:eu.databata.engine.util.PropagationUtils.java

/**
 * This method is suitable for reading files not larger than 2 GB.
 *//*from   w w w.  j av  a2  s.  c  om*/
private static String readFile(File file, String encoding) {
    String result = null;
    try {
        FileInputStream inputStream = new FileInputStream(file);
        try {
            byte[] bytes = new byte[(int) inputStream.getChannel().size()];
            inputStream.read(bytes);
            result = Charset.forName(encoding).decode(ByteBuffer.wrap(bytes)).toString();
        } finally {
            inputStream.close();
        }
    } catch (Exception e) {
        LOG.warn("Failed to read file: " + file.getName());
        throw new RuntimeException(e);
    }
    return dos2Unix(result);
}

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From source file:ch.admin.suis.msghandler.util.ZipUtils.java

/**
 * Creates a new unique ZIP file in the destination directory and adds to it
 * the provided collection of files.//  w  w  w  . ja  v  a  2  s . c om
 *
 * @param toDir The name of the file created
 * @param files The files to compress
 * @return A Zipped File
 * @throws IOException if the file cannot be created because of a IO error
 */
public static File compress(File toDir, Collection<File> files) throws IOException {
    final File zipFile = File.createTempFile("data", ".zip", toDir);

    // was there an exception?
    boolean exceptionThrown = false;

    try (ZipOutputStream zout = new ZipOutputStream(
            new BufferedOutputStream(new FileOutputStream(zipFile), BUFFER_SIZE))) {

        byte[] data = new byte[BUFFER_SIZE];

        for (File file : files) {
            // create the entry
            zout.putNextEntry(new ZipEntry(file.getName()));

            FileInputStream in = new FileInputStream(file);

            try (FileLock lock = in.getChannel().tryLock(0, Long.MAX_VALUE, true)) {
                isInValid(lock, in);
                int len;

                // write the file to the entry
                while ((len = in.read(data)) > 0) {
                    zout.write(data, 0, len);
                }
                lock.release();
            } finally {
                try {
                    in.close();
                } catch (IOException e) {
                    LOG.error("cannot properly close the opened file " + file.getAbsolutePath(), e);
                }
            }

        }
    } catch (IOException e) {
        LOG.error("error while creating the ZIP file " + zipFile.getAbsolutePath(), e);
        // mark for the finally block
        exceptionThrown = true;
        // rethrow - the finally block is only for the first exception
        throw e;
    } finally {
        // remove the file in case of an exception
        if (exceptionThrown && !zipFile.delete()) {
            LOG.error("cannot delete the file " + zipFile.getAbsolutePath());
        }
    }

    return zipFile;
}

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From source file:org.jasig.portlet.attachment.util.FileUtil.java

public static byte[] read(File file) throws IOException {
    if (file == null || !file.exists())
        return null;
    if (locks.contains(file.getAbsolutePath())) {
        try {/*from w  w w  . ja va2  s .  c  o m*/
            Thread.sleep(100);
        } catch (InterruptedException ie) {
        }
    }

    FileInputStream input = null;
    try {
        input = new FileInputStream(file);
        int available = input.available();
        FileChannel channel = input.getChannel();
        ByteBuffer bytes = ByteBuffer.allocate(available);
        channel.read(bytes);
        bytes.flip();
        return bytes.array();
    } finally {
        if (input != null) {
            input.close();
        }
    }

}

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From source file:edu.umich.flowfence.common.ParceledPayload.java

public static ParceledPayload fromParcel(Parcel p) {
    byte[] data = p.createByteArray();
    if (data == null) {
        // Null data = data's stored in an ashmem region.
        try (ParcelFileDescriptor pfd = p.readFileDescriptor()) {
            FileDescriptor fd = pfd.getFileDescriptor();
            int size = MemoryFile.getSize(fd);
            if (size == -1) {
                throw new ParcelFormatException("ParceledPayload blob is not ashmem");
            }//from  w w w. j a v a2 s. co m
            data = new byte[size];
            FileInputStream fis = new FileInputStream(fd);
            FileChannel chan = fis.getChannel();
            MappedByteBuffer mapping = chan.map(FileChannel.MapMode.READ_ONLY, 0, size);
            mapping.get(data);
        } catch (IOException e) {
            Log.e(TAG, "Couldn't unparcel - not an ashmem region?", e);
            ParcelFormatException pfe = new ParcelFormatException("Exception reading blob for ParceledPayload");
            pfe.initCause(e);
            throw pfe;
        }
    }
    return new ParceledPayload(data);
}

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From source file:Main.java

public static boolean copyFile(File sourceFile, File destFile) throws IOException {
    if (!destFile.exists()) {
        destFile.createNewFile();//from  w  ww . j a v a  2s.  co  m
    }
    FileInputStream source = null;
    FileOutputStream destination = null;
    try {
        source = new FileInputStream(sourceFile);
        destination = new FileOutputStream(destFile);
        destination.getChannel().transferFrom(source.getChannel(), 0, source.getChannel().size());
    } catch (Exception e) {
        //            FileLog.e("tmessages", e);
        return false;
    } finally {
        if (source != null) {
            source.close();
        }
        if (destination != null) {
            destination.close();
        }
    }
    return true;
}

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