Read from a channel with a ByteBuffer : ByteBuffer « File « Java Tutorial

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Java Tutorial » File » ByteBuffer

11. 42. 30. Read from a channel with a ByteBuffer


import java.io.FileInputStream;

import java.nio.ByteBuffer;

import java.nio.channels.ReadableByteChannel;



public class Main {

  public static void main(String[] argv) throws Exception {

    ReadableByteChannel channel = new FileInputStream("infile").getChannel();



    ByteBuffer buf = ByteBuffer.allocateDirect(10);



    int numRead = 0;

    while (numRead >= 0) {

      buf.rewind();



      numRead = channel.read(buf);



      buf.rewind();



      for (int i = 0; i < numRead; i++) {

        byte b = buf.get();

      }

    }

  }

}

11. 42. ByteBuffer
	11. 42. 1.	A ByteBuffer is a fixed-capacity buffer that holds byte values.
	11. 42. 2.	Create a ByteBuffer using a byte array
	11. 42. 3.	Create a non-direct ByteBuffer with a 10 byte capacity
	11. 42. 4.	Create a direct (memory-mapped) ByteBuffer with a 10 byte capacity.
	11. 42. 5.	Allocation automatically zeroes the ByteBuffer
	11. 42. 6.	Store and read a char array
	11. 42. 7.	Store and read a short
	11. 42. 8.	Rewind a ByteBuffer
	11. 42. 9.	Store and read an int
	11. 42. 10.	Store and read a long
	11. 42. 11.	Store and read a float
	11. 42. 12.	Store and read a double
	11. 42. 13.	ByteBuffer.hasRemaining()
	11. 42. 14.	Use while loop to read a ByteBuffer
	11. 42. 15.	Retrieve all bytes in the buffer
	11. 42. 16.	Retrieve bytes between the position and limit
	11. 42. 17.	Converting text to and from ByteBuffers with UTF-16BE
	11. 42. 18.	Converting text to and from ByteBuffers
	11. 42. 19.	Get the ByteBuffer's capacity
	11. 42. 20.	Use the absolute get().
	11. 42. 21.	Set the position
	11. 42. 22.	Use the relative get()
	11. 42. 23.	Get remaining byte count in a ByteBuffer
	11. 42. 24.	Set the limit for ByteBuffer
	11. 42. 25.	This convenience method sets the position to 0
	11. 42. 26.	Converting Between a ByteBuffer an a Byte Array
	11. 42. 27.	Putting Bytes into a ByteBuffer
	11. 42. 28.	Endian differences and data storage
	11. 42. 29.	Use FileChannel and ByteBuffer to Copy File
	11. 42. 30.	Read from a channel with a ByteBuffer
	11. 42. 31.	Test views of long elements in a ByteBuffer

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