Example usage for java.nio.channels FileChannel size

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:Main.java

private static byte[] readFile2Bytes(final File file) {
    FileChannel fc = null;
    try {/*from   w ww .j a v a 2 s .c o m*/
        fc = new RandomAccessFile(file, "r").getChannel();
        int size = (int) fc.size();
        MappedByteBuffer mbb = fc.map(FileChannel.MapMode.READ_ONLY, 0, size).load();
        byte[] data = new byte[size];
        mbb.get(data, 0, size);
        return data;
    } catch (IOException e) {
        e.printStackTrace();
        return null;
    } finally {
        try {
            if (fc != null) {
                fc.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

From source file:Main.java

public static void copyFile(File src, File dst) throws IOException {
    FileInputStream in = new FileInputStream(src);
    FileOutputStream out = new FileOutputStream(dst);
    FileChannel inChannel = in.getChannel();
    FileChannel outChannel = out.getChannel();

    try {/*from   w w  w.j a va  2 s .c  om*/
        inChannel.transferTo(0, inChannel.size(), outChannel);
    } finally {
        if (inChannel != null) {
            inChannel.close();
        }
        outChannel.close();
    }

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

From source file:Main.java

public static ByteBuffer readBytes(String file) throws IOException {
    ByteArrayOutputStream dataOut = new ByteArrayOutputStream();
    FileChannel fChannel = new RandomAccessFile(file, "r").getChannel();
    fChannel.transferTo(0, fChannel.size(), Channels.newChannel(dataOut));
    fChannel.close();/*from www.ja  va2 s.c o  m*/
    return ByteBuffer.wrap(dataOut.toByteArray());
}

From source file:Main.java

public static void copy(File src, File dst) throws IOException {
    FileInputStream inStream = new FileInputStream(src);
    FileOutputStream outStream = new FileOutputStream(dst);
    FileChannel inChannel = inStream.getChannel();
    FileChannel outChannel = outStream.getChannel();
    inChannel.transferTo(0, inChannel.size(), outChannel);
    inStream.close();/*from  w w  w.java2 s  .c  o  m*/
    outStream.flush();
    outStream.close();
}

From source file:com.viddu.handlebars.HandlebarsFileUtil.java

/**
 * Utility method to get contents of the File.
 * /*www  .  j  a v  a2 s .  c om*/
 * @param inputFile
 * @return
 * @throws IOException
 */
public static String getFileContents(File inputFile) throws IOException {
    FileInputStream stream = new FileInputStream(inputFile);
    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();
    }

}

From source file:GrepNIO.java

static void process(Pattern pattern, String fileName) throws IOException {

    // Get a FileChannel from the given file.
    FileChannel fc = new FileInputStream(fileName).getChannel();

    // Map the file's content
    ByteBuffer buf = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());

    // Decode ByteBuffer into CharBuffer
    CharBuffer cbuf = Charset.forName("ISO-8859-1").newDecoder().decode(buf);

    Matcher m = pattern.matcher(cbuf);
    while (m.find()) {
        System.out.println(m.group(0));
    }//from   w w  w.  j  av  a  2 s .  c  om
}

From source file:org.geomajas.plugin.deskmanager.utility.FileUtils.java

/**
 * Zip all files in a directory, only relative filenames are used, does not recurse.
 * //from  w w w . j a v  a  2  s.co  m
 * @param sourceFolder
 * @param targetFileName
 * @return
 * @throws IOException
 */
public static File zipDirectory(File sourceFolder, String targetFileName) throws IOException {
    File target = new File(sourceFolder, targetFileName + (targetFileName.endsWith(".zip") ? "" : ".zip"));
    if (target.isFile()) {
        throw new IOException("Bestand bestaat reeds! " + target.getAbsolutePath());
    }
    File[] files = sourceFolder.listFiles();

    ZipOutputStream zos = new ZipOutputStream(new FileOutputStream(target));
    WritableByteChannel out = Channels.newChannel(zos);
    FileInputStream is = null;
    try {
        for (File file : files) {
            zos.putNextEntry(new ZipEntry(file.getName()));

            is = new FileInputStream(file);
            FileChannel in = is.getChannel();
            in.transferTo(0, in.size(), out);

            is.close();
        }
    } catch (IOException e) {
        throw e;
    } finally {
        if (is != null) {
            is.close();
        }
        if (zos != null) {
            zos.close();
        }
    }

    return target;
}

From source file:Main.java

/**
 * Copies the contents of one file to the other using {@link FileChannel}s.
 * //w w  w  .j  ava  2s. com
 * @param src
 *            source {@link File}
 * @param dst
 *            destination {@link File}
 */
public static void copyFile(File src, File dst) throws IOException {
    FileInputStream in = new FileInputStream(src);
    FileOutputStream out = new FileOutputStream(dst);
    FileChannel inChannel = in.getChannel();
    FileChannel outChannel = out.getChannel();

    try {
        inChannel.transferTo(0, inChannel.size(), outChannel);
    } finally {
        if (inChannel != null) {
            inChannel.close();
        }
        if (outChannel != null) {
            outChannel.close();
        }
    }

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

From source file:Main.java

public static String findTitle(File f) {
    if (titlePattern == null) {
        initPattern();//from   www  .ja v a2  s  . c om
    }

    try {
        FileChannel fc = new FileInputStream(f).getChannel();

        MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());

        CharBuffer cb = Charset.forName("8859_1").newDecoder().decode(bb); //$NON-NLS-1$

        Matcher m = titlePattern.matcher(cb);
        String title = null;
        if (m.find()) {
            title = m.group(1);
        }

        return title;
    } catch (IOException e) {
        return null;
    }
}

From source file:GrepSun.java

private static void grep(File f) throws IOException {

    // Open the file and then get a channel from the stream
    FileInputStream fis = new FileInputStream(f);
    FileChannel fc = fis.getChannel();

    // Get the file's size and then map it into memory
    int sz = (int) fc.size();
    MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, sz);

    // Decode the file into a char buffer
    CharBuffer cb = decoder.decode(bb);

    // Perform the search
    grep(f, cb);/*  w  w  w  . ja  va  2s  . co m*/

    // Close the channel and the stream
    fc.close();
}