Examples of java.nio.channels.FileChannel.transferTo()

java.nio.channels.FileChannel.transferTo()
Transfers data from the file to the given channel. It may be very efficient. By invoking this methid, it will read form the file and write into the writable channel. Note: no guarantee whether all bytes may be transfered.And it does not modify the position of the channel. @param position the non-negative position to begin @param count the non-negative bytes to be transferred @param target the target channel to write into @return the number of bytes that were transferred. @throws IllegalArgumentException If the parameters are not correct @throws NonReadableChannelException If this channel is not readable @throws NonWritableChannelException If the target channel is not writable @throws ClosedChannelException If either channel has already been closed @throws AsynchronousCloseException If either channel is closed by other threads during this operation @throws ClosedByInterruptException If the thread is interrupted during this operation @throws IOException If any I/O error occurs

                    socketChannel_.write(buffer);
                    handleIncompleteWrite(buffer);
                }
                
                /* returns the number of bytes transferred from file to the socket */
                long bytesTransferred = fc.transferTo(startPosition, limit, socketChannel_);
                logger_.debug("Bytes transferred " + bytesTransferred);                
                bytesWritten += bytesTransferred;
                startPosition += bytesTransferred; 
                /*
                 * If the number of bytes transferred is less than intended

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                long bytesTransferred;
                try
                {
                    /* returns the number of bytes transferred from file to the socket */
                    bytesTransferred = fc.transferTo(startPosition, limit, socketChannel_);
                }
                catch (IOException e)
                {
                    // at least jdk1.6.0 on Linux seems to throw IOException
                    // when the socket is full. (Bug fixed for 1.7: http://bugs.sun.com/view_bug.do?bug_id=5103988)

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                fail();
            } catch (UnsupportedOperationException e) {
                // expected
            }
            try {
                channel.transferTo(0, 0, channel);
                fail();
            } catch (UnsupportedOperationException e) {
                // expected
            }
            channel.close();

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        FileChannel in = new FileInputStream(file).getChannel();
        // FileLock lock = in.lock();
        try {
            final long size = in.size();
            long written = 0;
            while ((written += in.transferTo(written, size, target)) < size) {
                ;
            }
            return size;
        } finally {
            in.close();

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      amount += ChannelUtil.writeLong(channel, dataLen);


      long position = 0;
      do
      {
        position += fc.transferTo(position, dataLen - position, channel);
      } while (position < dataLen);
      
      amount += position;
    }
    finally

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      File bakFile = new File(javaFile.getAbsolutePath() + ".bak");
      FileOutputStream fos = new FileOutputStream(bakFile);
      fos.write(DEFAULT_HEADER.getBytes());
      FileChannel fc = raf.getChannel();
      long count = raf.length() - endOfHeader;
      fc.transferTo(endOfHeader, count, fos.getChannel());
      fc.close();
      fos.close();
      raf.close();
      if (!javaFile.delete())
         log.severe("Failed to delete java file: " + javaFile);

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    public static String read(File file, String encoding) throws IOException {
        FileChannel in = new FileInputStream(file).getChannel();
        try {
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            in.transferTo(0, in.size(), Channels.newChannel(baos));
            return baos.toString(encoding);
        } finally {
            in.close();
        }
    }

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    public static String read(File file, String encoding) throws IOException {
        FileChannel in = new FileInputStream(file).getChannel();
        try {
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            in.transferTo(0, in.size(), Channels.newChannel(baos));
            return baos.toString(encoding);
        } finally {
            in.close();
        }
    }

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    public static String read(File file, String encoding) throws IOException {
        FileChannel in = new FileInputStream(file).getChannel();
        try {
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            in.transferTo(0, in.size(), Channels.newChannel(baos));
            return baos.toString(encoding);
        } finally {
            in.close();
        }
    }

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    public static String read(File file, String encoding) throws IOException {
        FileChannel in = new FileInputStream(file).getChannel();
        try {
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            in.transferTo(0, in.size(), Channels.newChannel(baos));
            return baos.toString(encoding);
        } finally {
            in.close();
        }
    }

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