Java tutorial
import java.nio.ByteBuffer; import java.nio.CharBuffer; import java.nio.charset.Charset; import java.nio.charset.CharsetEncoder; public class Main { public static void main(String[] args) throws Exception { CharsetEncoder encoder = Charset.forName("US-ASCII").newEncoder(); String response = "java2s.com"; ByteBuffer bb = ByteBuffer.allocate(10); System.out.println(encoder.encode(CharBuffer.wrap(response), bb, true)); } }