Example usage for java.nio.channels FileChannel size

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

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Introduction

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

Prototype

public abstract long size() throws IOException;

Source Link

Document

Returns the current size of this channel's file.

Usage

From source file:MainClass.java

private static void test() throws Exception {
    long[] primes = new long[] { 1, 2, 3, 5, 7 };
    File aFile = new File("C:/test/primes.txt");
    FileOutputStream outputFile = null;
    outputFile = new FileOutputStream(aFile);
    FileChannel file = outputFile.getChannel();
    ByteBuffer[] buffers = new ByteBuffer[3];
    buffers[0] = ByteBuffer.allocate(8);
    buffers[2] = ByteBuffer.allocate(8);
    String primeStr = null;//from   ww w  .  j a  v a  2 s.c  om
    for (long prime : primes) {
        primeStr = "prime = " + prime;
        buffers[0].putDouble((double) primeStr.length()).flip();
        buffers[1] = ByteBuffer.allocate(primeStr.length());
        buffers[1].put(primeStr.getBytes()).flip();
        buffers[2].putLong(prime).flip();
        file.write(buffers);
        buffers[0].clear();
        buffers[2].clear();
    }
    System.out.println("File written is " + file.size() + "bytes.");
    outputFile.close();
}

From source file:edu.mit.csail.sdg.alloy4.Terminal.java

public static void copyFile(File sourceFile, File destFile) throws IOException {
    if (!sourceFile.exists()) {
        return;//from   w  w w .j a  va 2s.  c om
    }
    if (!destFile.exists()) {
        destFile.createNewFile();
    }

    FileChannel source = null;
    FileChannel destination = null;

    try {
        source = new FileInputStream(sourceFile).getChannel();
        destination = new FileOutputStream(destFile).getChannel();
        destination.transferFrom(source, 0, source.size());
    } finally {
        if (source != null) {
            source.close();
        }
        if (destination != null) {
            destination.close();
        }
    }
}

From source file:it.isislab.dmason.util.SystemManagement.Worker.Updater.java

public static void copyFile(File sfile, File dfile) throws Exception {
    FileChannel source = new FileInputStream(sfile).getChannel();
    FileChannel dest = new FileOutputStream(dfile).getChannel();
    source.transferTo(0, source.size(), dest);
    source.close();//from w w w.ja  v  a  2  s . co  m
    dest.close();

}

From source file:com.bjorsond.android.timeline.utilities.Utilities.java

public static void copyFile(String fromFile, String toPath, String toFilename) {

    System.out.println("COPY!");
    if (Environment.getExternalStorageState().equals("mounted")) {
        File sdCardDirectory = Environment.getExternalStorageDirectory();

        try {//from   w ww . j  a v  a2  s .c  om
            if (sdCardDirectory.canWrite()) {

                File destinationDirectory = new File(toPath);
                File sourceFile = new File(fromFile);
                File destinationFile = new File(destinationDirectory, toFilename);

                if (!destinationDirectory.exists()) {
                    destinationDirectory.mkdirs();
                }

                FileChannel source = new FileInputStream(sourceFile).getChannel();
                FileChannel destination = new FileOutputStream(destinationFile).getChannel();
                destination.transferFrom(source, 0, source.size());
                source.close();
                destination.close();
            }
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

}

From source file:com.alibaba.otter.shared.common.utils.NioUtils.java

/**
 * ??copy/*  w w w .  j av  a 2 s. co  m*/
 */
public static long copy(InputStream input, OutputStream output) throws IOException {
    long count = 0;
    long n = 0;
    if (input instanceof FileInputStream) {
        FileChannel inChannel = ((FileInputStream) input).getChannel();
        WritableByteChannel outChannel = Channels.newChannel(output);
        count = inChannel.transferTo(0, inChannel.size(), outChannel);
    } else if (output instanceof FileOutputStream) {
        FileChannel outChannel = ((FileOutputStream) output).getChannel();
        ReadableByteChannel inChannel = Channels.newChannel(input);
        do {
            n = outChannel.transferFrom(inChannel, count, DEFAULT_BUFFER_SIZE);
            count += n;
        } while (n > 0);
    } else {
        byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];

        while (-1 != (n = input.read(buffer))) {
            output.write(buffer, 0, (int) n);
            count += n;
        }
        // ReadableByteChannel inChannel = Channels.newChannel(input);
        // WritableByteChannel outChannel = Channels.newChannel(output);
        //            
        // //ByteBuffer buffer = new ByteBuffer(DEFAULT_BUFFER_SIZE);
        // ByteBuffer buffer = ByteBuffer.allocateDirect(DEFAULT_BUFFER_SIZE);
        // while (-1 != (n = inChannel.read(buffer))) {
        // outChannel.write(buffer);
        // count += n;
        // }
    }
    return count;
}

From source file:es.uvigo.darwin.jmodeltest.io.HtmlReporter.java

@SuppressWarnings("resource")
public static void copyFile(File in, File out) throws IOException {
    FileChannel inChannel = new FileInputStream(in).getChannel();
    FileChannel outChannel = new FileOutputStream(out).getChannel();
    try {/* w  w w.  j  ava  2 s  .  c  o m*/
        inChannel.transferTo(0, inChannel.size(), outChannel);
    } catch (IOException e) {
        throw e;
    } finally {
        if (inChannel != null)
            inChannel.close();
        if (outChannel != null)
            outChannel.close();
    }
}

From source file:org.yamj.core.service.file.tools.FileTools.java

/**
 * Copy the source file to the destination
 *
 * @param src//from   www.  j a v a 2 s  .c  o  m
 * @param dst
 * @return
 */
public static boolean copyFile(File src, File dst) {
    boolean returnValue = Boolean.FALSE;

    if (!src.exists()) {
        LOG.error("The file '{}' does not exist", src);
        return returnValue;
    }

    if (dst.isDirectory()) {
        makeDirectories(dst);
        returnValue = copyFile(src, new File(dst + File.separator + src.getName()));
    } else {
        FileInputStream inSource = null;
        FileOutputStream outSource = null;
        FileChannel inChannel = null;
        FileChannel outChannel = null;
        try {
            // gc: copy using file channels, potentially much faster
            inSource = new FileInputStream(src);
            outSource = new FileOutputStream(dst);
            inChannel = inSource.getChannel();
            outChannel = outSource.getChannel();

            long p = 0, s = inChannel.size();
            while (p < s) {
                p += inChannel.transferTo(p, 1024 * 1024, outChannel);
            }
            return Boolean.TRUE;
        } catch (IOException error) {
            LOG.error("Failed copying file '{}' to '{}'", src, dst);
            LOG.error("File copying error", error);
            returnValue = Boolean.FALSE;
        } finally {
            if (inChannel != null) {
                try {
                    inChannel.close();
                } catch (IOException ex) {
                    // Ignore
                }
            }
            if (inSource != null) {
                try {
                    inSource.close();
                } catch (IOException ex) {
                    // Ignore
                }
            }

            if (outChannel != null) {
                try {
                    outChannel.close();
                } catch (IOException ex) {
                    // Ignore
                }
            }
            if (outSource != null) {
                try {
                    outSource.close();
                } catch (IOException ex) {
                    // Ignore
                }
            }
        }
    }

    return returnValue;
}

From source file:com.alibaba.otter.shared.common.utils.NioUtils.java

/**
 * ??copy/* w ww.j a v a 2  s  .co  m*/
 */
public static long copy(InputStream input, OutputStream output, long offset) throws IOException {
    long count = 0;
    long n = 0;
    if (input instanceof FileInputStream) {
        FileChannel inChannel = ((FileInputStream) input).getChannel();
        WritableByteChannel outChannel = Channels.newChannel(output);
        count = inChannel.transferTo(offset, inChannel.size() - offset, outChannel);
    } else if (output instanceof FileOutputStream) {
        FileChannel outChannel = ((FileOutputStream) output).getChannel();
        ReadableByteChannel inChannel = Channels.newChannel(input);
        do {
            n = outChannel.transferFrom(inChannel, offset + count, DEFAULT_BUFFER_SIZE);
            count += n;
        } while (n > 0);
    } else {
        byte[] buffer = new byte[DEFAULT_BUFFER_SIZE];

        input.skip(offset);
        while (-1 != (n = input.read(buffer))) {
            output.write(buffer, 0, (int) n);
            count += n;
        }
        // ReadableByteChannel inChannel = Channels.newChannel(input);
        // WritableByteChannel outChannel = Channels.newChannel(output);
        //            
        // //ByteBuffer buffer = new ByteBuffer(DEFAULT_BUFFER_SIZE);
        // ByteBuffer buffer = ByteBuffer.allocateDirect(DEFAULT_BUFFER_SIZE);
        // while (-1 != (n = inChannel.read(buffer))) {
        // outChannel.write(buffer);
        // count += n;
        // }
    }
    return count;
}

From source file:com.arc.embeddedcdt.gui.jtag.ConfigJTAGTab.java

public static byte[] read(File file) {
    try {//www  . ja va  2 s.c  o  m
        FileInputStream fis = new FileInputStream(file);
        FileChannel fc = fis.getChannel();
        byte[] data = new byte[(int) fc.size()]; // fc.size returns the
        // size of the file
        // which backs the
        // channel
        ByteBuffer bb = ByteBuffer.wrap(data);
        fc.read(bb);
        return data;
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}

From source file:maspack.fileutil.SafeFileUtils.java

/**
 * Internal copy file method./*from   ww  w .  j  av a  2 s.  c o  m*/
 * 
 * @param srcFile
 * the validated source file, must not be {@code null}
 * @param destFile
 * the validated destination file, must not be {@code null}
 * @param options
 * determine whether to use a file lock, and preserve date information
 * @throws IOException
 * if an error occurs
 */
private static void doCopyFile(File srcFile, File destFile, int options) throws IOException {
    if (destFile.exists() && destFile.isDirectory()) {
        throw new IOException("Destination '" + destFile + "' exists but is a directory");
    }

    File lockFile = new File(destFile.getAbsolutePath() + LOCK_EXTENSION);

    FileInputStream fis = null;
    FileOutputStream fos = null;
    FileChannel input = null;
    FileChannel output = null;
    try {
        fis = new FileInputStream(srcFile);
        fos = new FileOutputStream(destFile);
        input = fis.getChannel();
        output = fos.getChannel();
        long size = input.size();
        long pos = 0;
        long count = 0;

        // Create lock before starting transfer
        // NOTE: we are purposely not using the Java NIO FileLock, because that
        // is automatically removed when the JVM exits. We want this file to
        // persist to inform the system the transfer was never completed.
        if ((options & LOCK_FILE) != 0) {
            if (lockFile.exists()) {

                // if we are not cleaning old locks, throw error
                if ((options & CLEAN_LOCK) == 0) {
                    throw new IOException(
                            "Lock file exists, preventing a write to " + destFile.getAbsolutePath()
                                    + ".  Delete " + lockFile.getName() + " or set the CLEAN_LOCK option flag");
                }
            } else {
                lockFile.createNewFile(); // will always return true or throw
                                          // error
            }

        }

        while (pos < size) {
            count = size - pos > FILE_COPY_BUFFER_SIZE ? FILE_COPY_BUFFER_SIZE : size - pos;
            pos += output.transferFrom(input, pos, count);
        }
    } finally {
        closeQuietly(output);
        closeQuietly(fos);
        closeQuietly(input);
        closeQuietly(fis);
    }

    if (srcFile.length() != destFile.length()) {
        throw new IOException("Failed to copy full contents from '" + srcFile + "' to '" + destFile + "'");
    }

    if ((options & PRESERVE_DATE) != 0) {
        destFile.setLastModified(srcFile.lastModified());
    }

    // successful copy, delete lock file
    deleteQuietly(lockFile);

}