transmitter.java

本源码给出了在jbuilder下实现串口通信,并且如何使用

/*
 * @(#)Transmitter.java	1.4 98/06/15 SMI
 *
 * Author: Tom Corson
 *
 * Copyright (c) 1998 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Sun grants you ("Licensee") a non-exclusive, royalty free, license
 * to use, modify and redistribute this software in source and binary
 * code form, provided that i) this copyright notice and license appear
 * on all copies of the software; and ii) Licensee does not utilize the
 * software in a manner which is disparaging to Sun.
 *
 * This software is provided "AS IS," without a warranty of any kind.
 * ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
 * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND
 * ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY
 * LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THE
 * SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS
 * BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT,
 * INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES,
 * HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING
 * OUT OF THE USE OF OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS BEEN
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 *
 * This software is not designed or intended for use in on-line control
 * of aircraft, air traffic, aircraft navigation or aircraft
 * communications; or in the design, construction, operation or
 * maintenance of any nuclear facility. Licensee represents and
 * warrants that it will not use or redistribute the Software for such
 * purposes.
 */

package samples.ParallelBlackBox;

import java.lang.Thread;

import java.io.IOException;

import java.awt.Panel;
import java.awt.Label;
import java.awt.TextArea;
import java.awt.Checkbox;
import java.awt.Color;
import java.awt.BorderLayout;
import java.awt.FlowLayout;

import java.awt.event.TextListener;
import java.awt.event.TextEvent;
import java.awt.event.ItemListener;
import java.awt.event.ItemEvent;

import javax.comm.ParallelPort;

public class Transmitter
    extends Panel implements TextListener, ItemListener, Runnable {
  private Panel p,
  p1;
  private TextArea text;
  private Checkbox auto;
  private ByteStatistics counter;
  private ParallelPortDisplay owner;
  private Thread thr;
  private Color onColor,
  offColor;

  private boolean first;
  static String testString =
      "ABCDEFGHIJKLMNOPQRSTUVWXYZ\r\nabcdefghijklmnopqrstuvwxyz\r\n1234567890\r\n";

  public Transmitter(ParallelPortDisplay owner,
                     int rows,
                     int cols) {
    super();

    this.first = true;

    this.owner = owner;

    this.setLayout(new BorderLayout());

    p = new Panel();
    p.setLayout(new FlowLayout());

    p1 = new Panel();
    p1.setLayout(new BorderLayout());

    p1.add("West", new Label("Auto Transmit"));
    auto = new Checkbox();
    auto.addItemListener(this);
    p1.add("East", auto);
    p.add(p1);

    this.add("North", p);

    this.text = new TextArea(rows, cols);
    this.text.append("Type here");
    this.text.addTextListener(this);
    this.add("Center", text);

    this.counter = new ByteStatistics("Bytes Sent", 10,
                                      owner.port, false);
    this.add("South", this.counter);

    this.thr = null;

    this.onColor = Color.green;
    this.offColor = Color.black;
  }

  public void setPort(ParallelPort port) {
    this.counter.setPort(port);
  }

  public void showValues() {
    this.counter.showValues();
  }

  public void clearValues() {
    this.counter.clearValues();
  }

  public void setBitsPerCharacter(int val) {
    this.counter.setBitsPerCharacter(val);
  }

  /*
   *	Handler for transmit text area events
   */

  public void textValueChanged(TextEvent ev) {
    if (first && (this.text.getCaretPosition() > 0)) {
      first = false;

      this.text.replaceRange("",
                             0,
                             this.text.getCaretPosition()
                             - 1);
    }

    if (!first) {
      this.sendData();
    }

  }

  public void run() {
    this.sendData();
  }

  public void sendString(String str) {
    int count;

    count = str.length();

    if (count > 0) {
      this.owner.ctlSigs.BE = false;

      try {
        this.owner.out.write(str.getBytes());

        this.counter.incrementValue( (long) count);

        this.owner.ctlSigs.showValues();
        this.owner.ctlSigs.showErrorValues();
      }

      catch (IOException ex) {
        if (this.owner.open) {
          System.out.println(owner.port.getName()
                             + ": Cannot write to output stream");

          this.auto.setState(false);
        }
      }
    }
  }

  private void sendData() {
    String str;

    if (this.owner.open && this.auto.getState()) {
      while (this.owner.open && this.auto.getState()) {
        sendString(testString);
      }
    }

    else {
      str = this.text.getText();

      sendString(str);

      this.text.setText("");
    }
  }

  /*
   *	Handler for checkbox events
   */

  public void itemStateChanged(ItemEvent ev) {
    if (this.auto.getState() && (thr == null) && this.owner.open) {
      this.auto.setForeground(this.onColor);

      startTransmit();
    }

    else {
      stopTransmit();
    }
  }

  private void startTransmit() {
    if (this.owner.open && (thr == null)) {
      counter.resetRate();

      thr = new Thread(this, "Xmt " + owner.port.getName());

      thr.start();
    }
  }

  public void stopTransmit() {
    thr = null;

    this.auto.setState(false);
    this.auto.setForeground(this.offColor);
  }
}