package io;

import java.nio.*;

import java.nio.channels.*;

import java.nio.charset.*;

import java.io.*;

import java.util.*;

/**

* RUN:

* javac io/BufferToText.java && java io.BufferToText

*

* OUTPUT:

* ?????

* Decoded in Cp1251: Some text

* Some text

* Some text

*/

public class BufferToText {

private static final int BSIZE = 1024;

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

// 1

FileChannel fc = new FileOutputStream("data2.txt").getChannel();

fc.write(ByteBuffer.wrap("Some text ".getBytes()));

fc.close();

fc = new FileInputStream("data2.txt").getChannel();

ByteBuffer buffer = ByteBuffer.allocate(BSIZE);

fc.read(buffer);

buffer.flip();

System.out.println(buffer.asCharBuffer()); // show incorrect text: ?????

// decode with default codepage

buffer.rewind();

String encoding = System.getProperty("file.encoding");

System.out.println("Decoded in " + encoding + ": "

+ Charset.forName(encoding).decode(buffer)

);

// 2

fc = new FileOutputStream("data2.txt").getChannel();

fc.write(ByteBuffer.wrap("Some text ".getBytes("UTF-16BE")));

fc.close();

fc = new FileInputStream("data2.txt").getChannel();

buffer.clear();

fc.read(buffer);

buffer.flip();

System.out.println(buffer.asCharBuffer());

// 3

fc = new FileOutputStream("data2.txt").getChannel();

buffer = ByteBuffer.allocate(30);

buffer.asCharBuffer().put("Some text");

fc.write(buffer);

fc.close();

fc = new FileInputStream("data2.txt").getChannel();

buffer.clear();

fc.read(buffer);

buffer.flip();

System.out.println(buffer.asCharBuffer());

}

}