New Input/Output - Beginning Java 8 Language Features - page 410

// Read all data from the channel
while (fileChannel.read(buffer) > 0) {
// Flip the buffer before we can read data from it
buffer.flip();

// Display the read data as characters on the console
// Note that we are assuming that a byte represents a
// character, which is not true all the time. In a
// real world application, you should use
// CharsetDecoder to decode the bytes into character
// before you display/use them.
while (buffer.hasRemaining()) {
byte b = buffer.get();

// Assuming a byte represents a character
System.out.print((char) b);
}

// Clear the buffer before next read into it
buffer.clear();
}
}
catch (IOException e) {
e.printStackTrace();
}
}
}

STRANGE fits of passion have I known:
And I will dare to tell,
But in the lover's ear alone,
What once to me befell.

The steps to write data to a file using a buffer and a channel are as follows:

• Create an object of

FileOutputStream .

• Get a

FileChannel object using the getChannel() method of FileOutputStream .
Create a •

ByteBuffer object to write data to the file.

• Fill the

ByteBuffer with data.
Call the •

flip() method of the buffer to get it ready to be read by the channel.

• Call the

write() method of the FileChannel object by passing the ByteBuffer object filled
with data .

close() method.
Listing 9-8 puts all the above steps together to write the following text to luci5.txt file:

• Close the channel by calling its

In one of those sweet dreams I slept,
Kind Nature's gentlest boon!
And all the while my eyes I kept
On the descending moon.