java.nio.ByteBuffer to StringBuffer

[Nidhi Singhal]

Hi,

I want to convert java.nio.ByteBuffer object to a StringBuffer.

I have tried using getChar(int index) method of java.nio.ByteBuffer
and then tried to append each char to the StringBuffer.
But, when I print the contents of StringBuffer using SOP, it prints a series of '?'.

Is there any other way of converting from java.nio.ByteBuffer to StringBuffer ?

Please help me out.

Thanks,
Nidhi

[Jim Yingst]

You need to convert from bytes to characters. This will be determined by what sort of character encoding was used for the bytes. Take a look at the Charset class and the related CharsetEncoder and CharsetDecoder.

[Jeff Albertson]

import java.io.*;
import java.nio.*;
import java.nio.channels.*;
import java.nio.charset.*;
 
public class WorksForMe {
    public static void main(String[] args) throws IOException {
        File file = new File("WorksForMe.java");
        FileInputStream in = new FileInputStream(file);
        FileChannel channel = in.getChannel();
        ByteBuffer byteBuffer = channel.map(FileChannel.MapMode.READ_ONLY, 0, file.length());
        Charset charset = Charset.defaultCharset();
        CharsetDecoder decoder = charset.newDecoder();
        CharBuffer charBuffer = decoder.decode(byteBuffer);
        channel.close();
        String s = charBuffer.toString();
        System.out.println(s);
    }
}

[Harald Kirsch]

Originally posted by Nidhi Singhal:

I want to convert java.nio.ByteBuffer object to a StringBuffer.

I once wondered why this does not exit. Could not believe it. Finally I did it myself.

monq.stuff.Coder

Emma test coverage reports 41.2/42 lines code coverage for my junit tests. This does not mean it must be free of bugs, but I made at least an effort to get it right.

Download link at the bottom of the page mentioned above.