java - Get an OutputStream into a String

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What's the best way to pipe the output
from an java.io.OutputStream to a String in
Java?

Say I have the
method:

            writeToStream(Object o, OutputStream
            out)

Which writes
certain data from the object to the given stream. However, I want to get this output
into a String as easily as possible.

I'm
considering writing a class like this
(untested):

class
            StringOutputStream extends OutputStream {


 StringBuilder
            mBuf;

 public void write(int byte) throws IOException {

            mBuf.append((char) byte);
 }

 public String getString()
            {
 return mBuf.toString();

            }
}

But
is there a better way? I only want to run a test!

Answer

I would use a
ByteArrayOutputStream. And on finish you can
call:

new String(
            baos.toByteArray(), codepage
            );

or
better:

baos.toString(
            codepage );

For the
String constructor, the codepage can
be a String or an instance of href="http://docs.oracle.com/javase/7/docs/api/java/nio/charset/Charset.html"
rel="noreferrer">java.nio.charset.Charset. A possible value is href="http://docs.oracle.com/javase/7/docs/api/java/nio/charset/StandardCharsets.html#UTF_8"
rel="noreferrer">java.nio.charset.StandardCharsets.UTF_8.

The
method toString() accepts only a
String as a codepage parameter (stand
Java 8).