Java.io.Reader to String conversion

Question

I am working on a SOAP project with Jaxm and I retreive the result as a Reader, but I need to convert it into a String.
I did the following code but it is incredibely slow with a big reply (280kb) as I retrieve each character one after each other.
Does a faster solution exist ?
// Soap call
SOAPMessage reply = m_conn.call(message, endpoint);
java.util.Iterator it = reply.getAttachments();
// First attachment returned by the server hold my result
AttachmentPart resultAttachment = (AttachmentPart) it.next();
StreamSource resultStreamSource = (StreamSource) resultAttachment.getContent();
// Converts java.io.Reader to String
java.io.Reader resultReader = resultStreamSource.getReader();
String result = "";
int charValue = 0;
while ((charValue = resultReader.read()) != -1) {
   result = result + (char) charValue;

Answer 1

use a BufferedReader and create a large char[] (64k or something)
then use
char[] cbuf = new char[65536];
StringBuffer stringbuf = new StringBuffer();
int read_this_time = 0;
while (read_this_time != -1) {
read_this_time = BufferedReader.read(cbuf,0,65536);
stringbuf.append(cbuf,0,read_this_time);
}//end while
StringBuffer is faster than String concatenation because when java concatenates strings it creates a new object every time. StringBuffer just stores and appends the string without creating new objects.