messageoutputstream.java

JAVA网络编程技术内幕一书的源代码

/*
 * Java Network Programming, Second Edition
 * Merlin Hughes, Michael Shoffner, Derek Hamner
 * Manning Publications Company; ISBN 188477749X
 *
 * http://nitric.com/jnp/
 *
 * Copyright (c) 1997-1999 Merlin Hughes, Michael Shoffner, Derek Hamner;
 * all rights reserved; see license.txt for details.
 */

import java.io.*;

public class MessageOutputStream extends MessageOutput {
  protected OutputStream rawOut;
  protected DataOutputStream dataOut;
  protected ByteArrayOutputStream byteArrayOut;
  
  public MessageOutputStream (OutputStream out) {
    super (new ByteArrayOutputStream ());
    rawOut = out;
    dataOut = new DataOutputStream (rawOut);
    byteArrayOut = (ByteArrayOutputStream) super.out;
  }

  public void send () throws IOException {
    synchronized (rawOut) {
      dataOut.writeInt (byteArrayOut.size ());
      byteArrayOut.writeTo (rawOut);
    }
    byteArrayOut.reset ();
    rawOut.flush ();
  }
}