我将本守则编为。 Sun Java ME平台 SDK 3.0,该守则将聆听系列港口:
import gnu.io.CommPortIdentifier;
import gnu.io.SerialPort;
import gnu.io.SerialPortEvent;
import gnu.io.SerialPortEventListener;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.TextField;
import javax.microedition.midlet.*;
public class SerialPortMidlet extends MIDlet implements CommandListener, SerialPortEventListener
{
private Command download = new Command("download", Command.ITEM, 0);
private Command exit = new Command("exit", Command.ITEM, 1);
private Form f = new Form("test serial port");
private TextField ports = new TextField("data : ","",1000,TextField.ANY);
private static final String PORT_NAMES = "COM4";
private SerialPort serialPort;
private InputStream input;
private OutputStream output;
private static final int TIME_OUT = 2000;
private static final int DATA_RATE = 9600;
public SerialPortMidlet()
{
f.append(ports);
f.addCommand(download);
f.addCommand(exit);
f.setCommandListener(this);
}
public void startApp() {
Display.getDisplay(this).setCurrent(f);
initialize();
}
public void pauseApp() {
}
public void destroyApp(boolean unconditional) {
notifyDestroyed();
}
public void commandAction(Command c, Displayable d) {
if (c == exit)
destroyApp(true);
}
public void initialize() {
CommPortIdentifier portId = null;
Enumeration portEnum = CommPortIdentifier.getPortIdentifiers();
while (portEnum.hasMoreElements()) {
CommPortIdentifier currPortId = (CommPortIdentifier) portEnum.nextElement();
if (currPortId.getName().equals(PORT_NAMES)) {
portId = currPortId;
}
}
if (portId == null) {
System.out.println("Could not find COM port.");
return;
}
try
{
// open serial port, and use class name for the appName.
serialPort = (SerialPort) portId.open(this.getClass().getName(), TIME_OUT);
// set port parameters
serialPort.setSerialPortParams( DATA_RATE,
SerialPort.DATABITS_8,
SerialPort.STOPBITS_1,
SerialPort.PARITY_NONE );
// open the streams
input = serialPort.getInputStream();
output = serialPort.getOutputStream();
// add event listeners
serialPort.addEventListener(this);
serialPort.notifyOnDataAvailable(true);
}
catch (Exception e) {
System.err.println(e.toString());
}
}
public synchronized void close() {
if (serialPort != null) {
serialPort.removeEventListener();
serialPort.close();
}
}
public void serialEvent(SerialPortEvent oEvent) {
if (oEvent.getEventType() == SerialPortEvent.DATA_AVAILABLE)
{
try {
int available = input.available();
byte chunk[] = new byte[available];
input.read(chunk, 0, available);
// Displayed results are codepage dependent
ports.setString(new String(chunk));
System.out.print(new String(chunk));
} catch (Exception e) {
System.err.println(e.toString());
}
}
}
}
产出显示:
pre-init:
pre-load-properties:
exists.config.active:
exists.netbeans.user:
exists.user.properties.file:
load-properties:
exists.platform.active:
exists.platform.configuration:
exists.platform.profile:
basic-init:
cldc-pre-init:
cldc-init:
cdc-init:
bdj-init:
post-init:
init:
conditional-clean-init:
conditional-clean:
pre-clean:
clean-timestamp:
clean-preprocessed:
clean-classes:
Deleting directory C:Documents and SettingsAmbre-28Mes documentsJavaMESDKProjects estPortSerieuildcompiled
clean-obfuscated:
clean-preverified:
clean-manifest:
clean-jar:
clean-jad:
clean-javadoc:
clean-j9:
Deleting: C:Documents and SettingsAmbre-28Mes documentsJavaMESDKProjects estPortSerieconvert883343865
post-clean:
do-clean:
clean:
deps-jar:
pre-preprocess:
do-preprocess:
post-preprocess:
preprocess:
pre-compile:
extract-libs:
Created dir: C:Documents and SettingsAmbre-28Mes documentsJavaMESDKProjects estPortSerieuildcompiled
Expanding: D:
xtx-2.1-7-bins-r2RXTXcomm.jar into C:Documents and SettingsAmbre-28Mes documentsJavaMESDKProjects estPortSerieuildcompiled
do-compile:
Compiling 1 source file to C:Documents and SettingsAmbre-28Mes documentsJavaMESDKProjects estPortSerieuildcompiled
C:Documents and SettingsAmbre-28Mes documentsJavaMESDKProjects estPortSeriesrcSerialPortMidlet.java:16: cannot access java.util.EventListener
class file for java.util.EventListener not found
public class SerialPortMidlet extends MIDlet implements CommandListener, SerialPortEventListener
C:Documents and SettingsAmbre-28Mes documentsJavaMESDKProjects estPortSeriesrcSerialPortMidlet.java:34: cannot find symbol
symbol : variable this
location: class SerialPortMidlet
f.setCommandListener(this);
C:Documents and SettingsAmbre-28Mes documentsJavaMESDKProjects estPortSeriesrcSerialPortMidlet.java:37: cannot find symbol
symbol : variable this
location: class SerialPortMidlet
Display.getDisplay(this).setCurrent(f);
C:Documents and SettingsAmbre-28Mes documentsJavaMESDKProjects estPortSeriesrcSerialPortMidlet.java:65: cannot find symbol
symbol : variable this
location: class SerialPortMidlet
serialPort = (SerialPort) portId.open(this.getClass().getName(), TIME_OUT);
C:Documents and SettingsAmbre-28Mes documentsJavaMESDKProjects estPortSeriesrcSerialPortMidlet.java:78: cannot find symbol
symbol : variable this
location: class SerialPortMidlet
serialPort.addEventListener(this);
C:Documents and SettingsAmbre-28Mes documentsJavaMESDKProjects estPortSeriesrcSerialPortMidlet.java:92: cannot access java.util.EventObject
class file for java.util.EventObject not found
if (oEvent.getEventType() == SerialPortEvent.DATA_AVAILABLE)
6 errors
C:Documents and SettingsAmbre-28Mes documentsJavaMESDKProjects estPortSerie
bprojectuild-impl.xml:246: Compile failed; see the compiler error output for details.
BUILD FAILED (total time: 7 seconds)
该系统是Windows XP,我已在<代码>上添加了RXEKcomm.jar。 Libraries & Resources of the project property. 因此,为什么有这些错误?