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jRxTx is a library for Java serial communication.
There is a newer version: 1.0.1
/*-------------------------------------------------------------------------
|   RXTX License v 2.1 - LGPL v 2.1 + Linking Over Controlled Interface.
|   RXTX is a native interface to serial ports in java.
|   Copyright 1997-2007 by Trent Jarvi [email protected] and others who
|   actually wrote it.  See individual source files for more information.
|
|   A copy of the LGPL v 2.1 may be found at
|   http://www.gnu.org/licenses/lgpl.txt on March 4th 2007.  A copy is
|   here for your convenience.
|
|   This library is free software; you can redistribute it and/or
|   modify it under the terms of the GNU Lesser General Public
|   License as published by the Free Software Foundation; either
|   version 2.1 of the License, or (at your option) any later version.
|
|   This library is distributed in the hope that it will be useful,
|   but WITHOUT ANY WARRANTY; without even the implied warranty of
|   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
|   Lesser General Public License for more details.
|
|   An executable that contains no derivative of any portion of RXTX, but
|   is designed to work with RXTX by being dynamically linked with it,
|   is considered a "work that uses the Library" subject to the terms and
|   conditions of the GNU Lesser General Public License.
|
|   The following has been added to the RXTX License to remove
|   any confusion about linking to RXTX.   We want to allow in part what
|   section 5, paragraph 2 of the LGPL does not permit in the special
|   case of linking over a controlled interface.  The intent is to add a
|   Java Specification Request or standards body defined interface in the 
|   future as another exception but one is not currently available.
|
|   http://www.fsf.org/licenses/gpl-faq.html#LinkingOverControlledInterface
|
|   As a special exception, the copyright holders of RXTX give you
|   permission to link RXTX with independent modules that communicate with
|   RXTX solely through the Sun Microsytems CommAPI interface version 2,
|   regardless of the license terms of these independent modules, and to copy
|   and distribute the resulting combined work under terms of your choice,
|   provided that every copy of the combined work is accompanied by a complete
|   copy of the source code of RXTX (the version of RXTX used to produce the
|   combined work), being distributed under the terms of the GNU Lesser General
|   Public License plus this exception.  An independent module is a
|   module which is not derived from or based on RXTX.
|
|   Note that people who make modified versions of RXTX are not obligated
|   to grant this special exception for their modified versions; it is
|   their choice whether to do so.  The GNU Lesser General Public License
|   gives permission to release a modified version without this exception; this
|   exception also makes it possible to release a modified version which
|   carries forward this exception.
|
|   You should have received a copy of the GNU Lesser General Public
|   License along with this library; if not, write to the Free
|   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
|   All trademarks belong to their respective owners.
--------------------------------------------------------------------------*/
package gnu.io;

import java.util.TooManyListenersException;

/**
 * @author Trent Jarvi
 * @version %I%, %G%
 * @since JDK1.0
 */

public abstract class ParallelPort extends CommPort {
    public static final int LPT_MODE_ANY = 0;
    public static final int LPT_MODE_SPP = 1;
    public static final int LPT_MODE_PS2 = 2;
    public static final int LPT_MODE_EPP = 3;
    public static final int LPT_MODE_ECP = 4;
    public static final int LPT_MODE_NIBBLE = 5;

    public abstract int getMode();

    public abstract int setMode(int mode) throws UnsupportedCommOperationException;

    public abstract void restart();

    public abstract void suspend();

    public abstract boolean isPaperOut();

    public abstract boolean isPrinterBusy();

    public abstract boolean isPrinterError();

    public abstract boolean isPrinterSelected();

    public abstract boolean isPrinterTimedOut();

    public abstract int getOutputBufferFree();

    public abstract void addEventListener(ParallelPortEventListener lsnr) throws TooManyListenersException;

    public abstract void removeEventListener();

    public abstract void notifyOnError(boolean enable);

    public abstract void notifyOnBuffer(boolean enable);
    /*
     * public int PAR_EV_ERROR 1 public int PAR_EV_BUFFER 2 public ParallelPort(){} private native static void
     * Initialize(); public LPRPort( String name ) throws IOException; private native int open( String name ) throws
     * IOException; private int fd; private final ParallelOutputStream out = new ParallelOutputStream(); public
     * OutputStream getOutputStream(); private final ParallelInputStream in = new ParallelInputStream(); public
     * InputStream getInputStream(); private int lprmode=LPT_MODE_ANY; public native boolean setLPRMode(int mode) throws
     * UnsupportedCommOperationException; private int speed; public int getBaudRate(); private int dataBits; public int
     * getDataBits(); private int stopBits; public int getStopBits(); private int parity; public int getParity();
     * private native void nativeClose(); public void close(); public void enableReceiveFraming( int f ) throws
     * UnsupportedCommOperationException; public void disableReceiveFraming() {} public boolean
     * isReceiveFramingEnabled(); public int getReceiveFramingByte(); private int timeout = 0; public void
     * enableReceiveTimeout( int t ); public void disableReceiveTimeout(); public boolean isReceiveTimeoutEnabled();
     * public int getReceiveTimeout(); private int threshold = 1; public void enableReceiveThreshold( int t ); public
     * void disableReceiveThreshold(); public int getReceiveThreshold(); public boolean isReceiveThresholdEnabled();
     * public native void setInputBufferSize( int size ); public native int getInputBufferSize(); public native void
     * setOutputBufferSize( int size ); public Abstract int getOutputBufferSize(); private native void writeByte( int b
     * ) throws IOException; private native void writeArray( byte b[], int off, int len ) throws IOException; private
     * native void drain() throws IOException; private native int nativeavailable() throws IOException; private native
     * int readByte() throws IOException; private native int readArray( byte b[], int off, int len ) throws IOException;
     * private ParallelPortEventListener PPEventListener; private MonitorThread monThread; native void eventLoop(); void
     * sendEvent( int event, boolean state ); protected void finalize();
     */
}