Java I/O How to - Convert byte data into character data via Charset

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Question

We would like to know how to convert byte data into character data via Charset.

Answer

  /*from  w w w. j  a  v a 2 s  .c o m*/

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.channels.FileChannel;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;

public class Main {
  public static void main(String[] arguments) {
    try {
      String data = "friends.dat";
      FileInputStream inData = new FileInputStream(data);
      FileChannel inChannel = inData.getChannel();
      long inSize = inChannel.size();
      ByteBuffer source = ByteBuffer.allocate((int) inSize);
      inChannel.read(source, 0);
      source.position(0);
      for (int i = 0; source.remaining() > 0; i++)
        System.out.print(source.get() + " ");

      source.position(0);
      Charset ascii = Charset.forName("US-ASCII");
      CharsetDecoder toAscii = ascii.newDecoder();
      CharBuffer destination = toAscii.decode(source);
      destination.position(0);
      System.out.println("\n\nNew character data:");
      for (int i = 0; destination.remaining() > 0; i++)
        System.out.print(destination.get());
    } catch (Exception ioe) {
      System.out.println(ioe.getMessage());
    }
  }
}

The code above generates the following result.

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