How to transfer data from ByteBuffer to byte array in java.

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How to transfer data from ByteBuffer to byte array in java.
Posted on: July 26, 2010 at 12:00 AM

In this tutorial you will see how to transfer data from ByteBuffer to byte array in java.

How to transfer data from ByteBuffer to byte array in java.

In this tutorial, we will discuss the use of get(byte[] array,int offset, int length) method of byte
stream class. The get(byte[] array,int offset, int length) method transfer bytes from buffer into byte array.

About ByteBuffer API:

The java.nio.ByteBuffer class extends java.nio.Buffer class. It provides the following methods:

Return type	Method	Description
static ByteBuffer	wrap(byte array)	The wrap method create a byte buffer by wrapping the associated byte array.
ByteBuffer	get(byte dest,int offset, int length)	The get(.....) method transfer byte from associated buffer into byte array.

code


import java.io.*;

import java.nio.*;

import java.io.FileInputStream;

import java.nio.ByteBuffer;

import java.nio.channels.FileChannel;



public class BufferTransfer {

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

    FileInputStream finStream = new FileInputStream("testfile1.txt");

    byte[] bArray = new byte[125];

    FileChannel fchannel = finStream.getChannel();

    ByteBuffer bytebuf = ByteBuffer.wrap(bArray);

    fchannel.read(bytebuf);

    bytebuf.flip();

    bArray = new byte[bytebuf.capacity()];

    System.out.print("Contents into buffer : ");

    while (bytebuf.hasRemaining()) {

      System.out.print((char) bytebuf.get());

    }

    bytebuf.clear();

    bytebuf.get(bArray, 0, bArray.length);

    System.out.print("\n");

    System.out.print("Contents into Array : ");

    for (int i = 0; i < bytebuf.capacity(); i++) {

      System.out.print((char) bArray[i]);

    }

  }

}

output

C:\>java BufferTransfer
Contents into buffer : bharat singh
Contents into Array : bharat singh

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