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//: io/BufferToText.java

// Converting text to and from ByteBuffers

import java.nio.*;

import java.nio.channels.*;

import java.nio.charset.*;

import java.io.*;

public class BufferToText {

private static final int BSIZE = 1024;

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

FileChannel fc =

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

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

fc.close();

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

ByteBuffer buff = ByteBuffer.allocate(BSIZE);

fc.read(buff);

buff.flip();

// Doesn't work:

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

// Decode using this system's default Charset:

buff.rewind();

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

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

+ Charset.forName(encoding).decode(buff));

// Or, we could encode with something that will print:

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

fc.write(ByteBuffer.wrap(

"Some text".getBytes("UTF-16BE")));

fc.close();

// Now try reading again:

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

buff.clear();

fc.read(buff);

buff.flip();

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

// Use a CharBuffer to write through:

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

buff = ByteBuffer.allocate(24); // More than needed

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

fc.write(buff);

fc.close();

// Read and display:

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

buff.clear();

fc.read(buff);

buff.flip();

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

}

} /* Output:

????

Decoded using Cp1252: Some text

Some text

Some text

*///:~