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package NIO;

import java.io.File;

import java.io.RandomAccessFile;

import java.nio.ByteBuffer;

import java.nio.CharBuffer;

import java.nio.MappedByteBuffer;

import java.nio.channels.FileChannel;

import java.nio.charset.Charset;

import java.nio.charset.CharsetDecoder;

import java.nio.charset.CharsetEncoder;

public class UseCharsets

{

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

String inputFile = "samplein.txt";

String outputFile = "sampleout.txt";

RandomAccessFile inf = new RandomAccessFile( inputFile, "r" );

RandomAccessFile outf = new RandomAccessFile( outputFile, "rw" );

long inputLength = new File( inputFile ).length();

FileChannel inc = inf.getChannel();

FileChannel outc = outf.getChannel();

MappedByteBuffer inputData =

inc.map( FileChannel.MapMode.READ_ONLY, 0, inputLength );

Charset latin1 = Charset.forName( "ISO-8859-1" );

CharsetDecoder decoder = latin1.newDecoder();

CharsetEncoder encoder = latin1.newEncoder();

CharBuffer cb = decoder.decode( inputData );

// Process char data here

ByteBuffer outputData = encoder.encode( cb );

outc.write( outputData );

inf.close();

outf.close();

}

}