用Java Communications API,给你一个打开串行端口德例子: 是调用CommPortIdentifier对象德open()方法,获得一个SerialPort(串行口)对象,src如下: import java.awt.*; import java.io.*; import javax.comm.*; import java.util.*;/** * Open a serial port using Java Communications. * * @author Ian F. Darwin, [email protected] */ public class CommPortOpen { /** How long to wait for the open to finish up. */ public static final int TIMEOUTSECONDS = 30; /** The baud rate to use. */ public static final int BAUD = 9600; /** The parent Frame, for the chooser. */ protected Frame parent; /** The input stream */ protected DataInputStream is; /** The output stream */ protected PrintStream os; /** The last line read from the serial port. */ protected String response; /** A flag to control debugging output. */ protected boolean debug = true; /** The chosen Port Identifier */ CommPortIdentifier thePortID; /** The chosen Port itself */ CommPort thePort; public static void main(String[] argv) throws IOException, NoSuchPortException, PortInUseException, UnsupportedCommOperationException { new CommPortOpen(null).converse(); System.exit(0); } /* Constructor */ public CommPortOpen(Frame f) throws IOException, NoSuchPortException, PortInUseException, UnsupportedCommOperationException {
// Use the PortChooser from before. Pop up the JDialog. PortChooser chooser = new PortChooser(null); String portName = null; do { chooser.setVisible(true);
// Dialog done. Get the port name. portName = chooser.getSelectedName(); if (portName == null) System.out.println("No port selected. Try again.\n"); } while (portName == null); // Get the CommPortIdentifier. thePortID = chooser.getSelectedIdentifier(); // Now actually open the port. // This form of openPort takes an Application Name and a timeout. // System.out.println("Trying to open " + thePortID.getName() + "..."); switch (thePortID.getPortType()) { case CommPortIdentifier.PORT_SERIAL: thePort = thePortID.open("DarwinSys DataComm", TIMEOUTSECONDS * 1000); SerialPort myPort = (SerialPort) thePort; // set up the serial port myPort.setSerialPortParams(BAUD, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE); break; case CommPortIdentifier.PORT_PARALLEL: thePort = thePortID.open("DarwinSys Printing", TIMEOUTSECONDS * 1000); ParallelPort pPort = (ParallelPort)thePort; // Tell API to pick "best available mode" - can fail! // myPort.setMode(ParallelPort.LPT_MODE_ANY); // Print what the mode is int mode = pPort.getMode(); switch (mode) { case ParallelPort.LPT_MODE_ECP: System.out.println("Mode is: ECP"); break; case ParallelPort.LPT_MODE_EPP: System.out.println("Mode is: EPP"); break; case ParallelPort.LPT_MODE_NIBBLE: System.out.println("Mode is: Nibble Mode."); break; case ParallelPort.LPT_MODE_PS2: System.out.println("Mode is: Byte mode."); break; case ParallelPort.LPT_MODE_SPP: System.out.println("Mode is: Compatibility mode."); break; // ParallelPort.LPT_MODE_ANY is a "set only" mode; // tells the API to pick "best mode"; will report the // actual mode it selected. default: throw new IllegalStateException("Parallel mode " + mode + " invalid."); } break; default: // Neither parallel nor serial?? throw new IllegalStateException("Unknown port type " + thePortID); } // Get the input and output streams // Printers can be write-only try { is = new DataInputStream(thePort.getInputStream()); } catch (IOException e) { System.err.println("Can't open input stream: write-only"); is = null; } os = new PrintStream(thePort.getOutputStream(), true); } /** This method will be overridden by non-trivial subclasses * to hold a conversation. */ protected void converse() throws IOException { System.out.println("Ready to read and write port."); // Input/Output code not written -- must subclass. // Finally, clean up. if (is != null) is.close(); os.close(); } }
/* * @(#)SimpleWrite.java 1.12 98/06/25 SMI * * 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. */import java.io.*; import java.util.*; import javax.comm.*;public class Dial_up implements SerialPortEventListener{ static Enumeration portList; static CommPortIdentifier portId; static String messageString = "Hello, world!\n"; static SerialPort serialPort; static OutputStream outputStream; static InputStream inputStream; public static void main(String[] args) { portList = CommPortIdentifier.getPortIdentifiers(); while (portList.hasMoreElements()) { portId = (CommPortIdentifier) portList.nextElement(); if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) { if (portId.getName().equals("COM1")) { //if (portId.getName().equals("/dev/term/a")) { try { serialPort = (SerialPort) portId.open("SimpleWriteApp", 2000); } catch (PortInUseException e) {} try { outputStream = serialPort.getOutputStream(); } catch (IOException e) {} try { inputStream = serialPort.getInputStream(); } catch (IOException e) {} try { serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE); } catch (UnsupportedCommOperationException e) {} try { serialPort.addEventListener(new SerialListener1()); } catch (TooManyListenersException e) {} serialPort.notifyOnDataAvailable(true); try { outputStream.write(messageString.getBytes()); } catch (IOException e) {} } }//end of if COM1 }//end of while }//end of main public void serialEvent(SerialPortEvent event) { switch(event.getEventType()) { case SerialPortEvent.BI: case SerialPortEvent.OE: case SerialPortEvent.FE: case SerialPortEvent.PE: case SerialPortEvent.CD: case SerialPortEvent.CTS: case SerialPortEvent.DSR: case SerialPortEvent.RI: case SerialPortEvent.OUTPUT_BUFFER_EMPTY: break; case SerialPortEvent.DATA_AVAILABLE: byte[] readBuffer = new byte[20]; try { while (inputStream.available() > 0) { int numBytes = inputStream.read(readBuffer); } System.out.print(new String(readBuffer)); } catch (IOException e) {} break; } } }//end of class
import java.io.*; import java.util.*; import javax.comm.*;public class SimpleRead implements Runnable, SerialPortEventListener { static CommPortIdentifier portId; static Enumeration portList; InputStream inputStream; SerialPort serialPort; Thread readThread; public static void main(String[] args) { portList = CommPortIdentifier.getPortIdentifiers(); while (portList.hasMoreElements()) { portId = (CommPortIdentifier) portList.nextElement(); if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) { if (portId.getName().equals("COM1")) { // if (portId.getName().equals("/dev/term/a")) { SimpleRead reader = new SimpleRead(); } } } } public SimpleRead() { try { serialPort = (SerialPort) portId.open("SimpleReadApp", 2000); } catch (PortInUseException e) {} try { inputStream = serialPort.getInputStream(); } catch (IOException e) {} try { serialPort.addEventListener(this); } catch (TooManyListenersException e) {} serialPort.notifyOnDataAvailable(true); try { serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE); } catch (UnsupportedCommOperationException e) {} readThread = new Thread(this); readThread.start(); } public void run() { try { Thread.sleep(20000); } catch (InterruptedException e) {} } public void serialEvent(SerialPortEvent event) { System.out.println("event.getEventType() : " + event.getEventType()); switch (event.getEventType()) { case SerialPortEvent.BI: case SerialPortEvent.OE: case SerialPortEvent.FE: case SerialPortEvent.PE: case SerialPortEvent.CD: case SerialPortEvent.CTS: case SerialPortEvent.DSR: case SerialPortEvent.RI: case SerialPortEvent.OUTPUT_BUFFER_EMPTY: break; case SerialPortEvent.DATA_AVAILABLE: byte[] readBuffer = new byte[20]; try { while (inputStream.available() > 0) { int numBytes = inputStream.read(readBuffer); } System.out.print(new String(readBuffer)); } catch (IOException e) {} break; } } }
是调用CommPortIdentifier对象德open()方法,获得一个SerialPort(串行口)对象,src如下:
import java.awt.*;
import java.io.*;
import javax.comm.*;
import java.util.*;/**
* Open a serial port using Java Communications.
*
* @author Ian F. Darwin, [email protected]
*/
public class CommPortOpen {
/** How long to wait for the open to finish up. */
public static final int TIMEOUTSECONDS = 30;
/** The baud rate to use. */
public static final int BAUD = 9600;
/** The parent Frame, for the chooser. */
protected Frame parent;
/** The input stream */
protected DataInputStream is;
/** The output stream */
protected PrintStream os;
/** The last line read from the serial port. */
protected String response;
/** A flag to control debugging output. */
protected boolean debug = true;
/** The chosen Port Identifier */
CommPortIdentifier thePortID;
/** The chosen Port itself */
CommPort thePort; public static void main(String[] argv)
throws IOException, NoSuchPortException, PortInUseException,
UnsupportedCommOperationException { new CommPortOpen(null).converse(); System.exit(0);
} /* Constructor */
public CommPortOpen(Frame f)
throws IOException, NoSuchPortException, PortInUseException,
UnsupportedCommOperationException {
// Use the PortChooser from before. Pop up the JDialog.
PortChooser chooser = new PortChooser(null); String portName = null;
do {
chooser.setVisible(true);
// Dialog done. Get the port name.
portName = chooser.getSelectedName(); if (portName == null)
System.out.println("No port selected. Try again.\n");
} while (portName == null); // Get the CommPortIdentifier.
thePortID = chooser.getSelectedIdentifier(); // Now actually open the port.
// This form of openPort takes an Application Name and a timeout.
//
System.out.println("Trying to open " + thePortID.getName() + "..."); switch (thePortID.getPortType()) {
case CommPortIdentifier.PORT_SERIAL:
thePort = thePortID.open("DarwinSys DataComm",
TIMEOUTSECONDS * 1000);
SerialPort myPort = (SerialPort) thePort; // set up the serial port
myPort.setSerialPortParams(BAUD, SerialPort.DATABITS_8,
SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
break; case CommPortIdentifier.PORT_PARALLEL:
thePort = thePortID.open("DarwinSys Printing",
TIMEOUTSECONDS * 1000);
ParallelPort pPort = (ParallelPort)thePort; // Tell API to pick "best available mode" - can fail!
// myPort.setMode(ParallelPort.LPT_MODE_ANY); // Print what the mode is
int mode = pPort.getMode();
switch (mode) {
case ParallelPort.LPT_MODE_ECP:
System.out.println("Mode is: ECP");
break;
case ParallelPort.LPT_MODE_EPP:
System.out.println("Mode is: EPP");
break;
case ParallelPort.LPT_MODE_NIBBLE:
System.out.println("Mode is: Nibble Mode.");
break;
case ParallelPort.LPT_MODE_PS2:
System.out.println("Mode is: Byte mode.");
break;
case ParallelPort.LPT_MODE_SPP:
System.out.println("Mode is: Compatibility mode.");
break;
// ParallelPort.LPT_MODE_ANY is a "set only" mode;
// tells the API to pick "best mode"; will report the
// actual mode it selected.
default:
throw new IllegalStateException("Parallel mode " +
mode + " invalid.");
}
break;
default: // Neither parallel nor serial??
throw new IllegalStateException("Unknown port type " + thePortID);
} // Get the input and output streams
// Printers can be write-only
try {
is = new DataInputStream(thePort.getInputStream());
} catch (IOException e) {
System.err.println("Can't open input stream: write-only");
is = null;
}
os = new PrintStream(thePort.getOutputStream(), true);
} /** This method will be overridden by non-trivial subclasses
* to hold a conversation.
*/
protected void converse() throws IOException { System.out.println("Ready to read and write port."); // Input/Output code not written -- must subclass. // Finally, clean up.
if (is != null)
is.close();
os.close();
}
}
* @(#)SimpleWrite.java 1.12 98/06/25 SMI
*
* 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.
*/import java.io.*;
import java.util.*;
import javax.comm.*;public class Dial_up implements SerialPortEventListener{
static Enumeration portList;
static CommPortIdentifier portId;
static String messageString = "Hello, world!\n";
static SerialPort serialPort;
static OutputStream outputStream;
static InputStream inputStream; public static void main(String[] args) {
portList = CommPortIdentifier.getPortIdentifiers(); while (portList.hasMoreElements()) {
portId = (CommPortIdentifier) portList.nextElement();
if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
if (portId.getName().equals("COM1")) {
//if (portId.getName().equals("/dev/term/a")) {
try {
serialPort = (SerialPort)
portId.open("SimpleWriteApp", 2000);
} catch (PortInUseException e) {} try {
outputStream = serialPort.getOutputStream();
} catch (IOException e) {} try {
inputStream = serialPort.getInputStream();
} catch (IOException e) {} try {
serialPort.setSerialPortParams(9600,
SerialPort.DATABITS_8,
SerialPort.STOPBITS_1,
SerialPort.PARITY_NONE);
} catch (UnsupportedCommOperationException e) {} try {
serialPort.addEventListener(new SerialListener1());
} catch (TooManyListenersException e) {}
serialPort.notifyOnDataAvailable(true); try {
outputStream.write(messageString.getBytes());
} catch (IOException e) {}
}
}//end of if COM1
}//end of while
}//end of main public void serialEvent(SerialPortEvent event) {
switch(event.getEventType()) {
case SerialPortEvent.BI:
case SerialPortEvent.OE:
case SerialPortEvent.FE:
case SerialPortEvent.PE:
case SerialPortEvent.CD:
case SerialPortEvent.CTS:
case SerialPortEvent.DSR:
case SerialPortEvent.RI:
case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
break;
case SerialPortEvent.DATA_AVAILABLE:
byte[] readBuffer = new byte[20]; try {
while (inputStream.available() > 0) {
int numBytes = inputStream.read(readBuffer);
}
System.out.print(new String(readBuffer));
} catch (IOException e) {}
break;
}
}
}//end of class
import java.util.*;
import javax.comm.*;public class SimpleRead implements Runnable, SerialPortEventListener {
static CommPortIdentifier portId;
static Enumeration portList; InputStream inputStream;
SerialPort serialPort;
Thread readThread; public static void main(String[] args) {
portList = CommPortIdentifier.getPortIdentifiers(); while (portList.hasMoreElements()) {
portId = (CommPortIdentifier) portList.nextElement();
if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
if (portId.getName().equals("COM1")) {
// if (portId.getName().equals("/dev/term/a")) {
SimpleRead reader = new SimpleRead();
}
}
}
} public SimpleRead() {
try {
serialPort = (SerialPort) portId.open("SimpleReadApp", 2000);
}
catch (PortInUseException e) {} try {
inputStream = serialPort.getInputStream();
}
catch (IOException e) {} try {
serialPort.addEventListener(this);
}
catch (TooManyListenersException e) {} serialPort.notifyOnDataAvailable(true);
try {
serialPort.setSerialPortParams(9600,
SerialPort.DATABITS_8,
SerialPort.STOPBITS_1,
SerialPort.PARITY_NONE);
}
catch (UnsupportedCommOperationException e) {} readThread = new Thread(this);
readThread.start();
} public void run() {
try {
Thread.sleep(20000);
}
catch (InterruptedException e) {}
} public void serialEvent(SerialPortEvent event) {
System.out.println("event.getEventType() : " + event.getEventType());
switch (event.getEventType()) {
case SerialPortEvent.BI:
case SerialPortEvent.OE:
case SerialPortEvent.FE:
case SerialPortEvent.PE:
case SerialPortEvent.CD:
case SerialPortEvent.CTS:
case SerialPortEvent.DSR:
case SerialPortEvent.RI:
case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
break;
case SerialPortEvent.DATA_AVAILABLE:
byte[] readBuffer = new byte[20]; try {
while (inputStream.available() > 0) {
int numBytes = inputStream.read(readBuffer);
}
System.out.print(new String(readBuffer));
}
catch (IOException e) {}
break;
}
}
}