Kommunikation med en klients com-port gennem en Applet???

Du kan evt. bruge JAVACOMM

http://www.javasoft.com/products/javacomm/index.html

Men der er de sædvanlige problemer med at du skal signe din applet, men JCOMM er ideel til seriel kommunikation, så prøv at starte med det.

Jeg har en gang fundet dette på nette til kommunikation af en com-port. Jeg har dog ikke fået testet det endnu...

Hilsen Lars

import java.io.InputStream;
import java.io.OutputStream;
import java.io.IOException;
import java.util.Enumeration;
import javax.comm.*;

public class COMPort {

    public COMPort(String portname) throws Exception {
        init(portname, 2400, 100);
    }

    public COMPort(String portname, int rate) throws Exception {
        init(portname, rate, 100);
    }

    public COMPort(String portname, int rate, int timeout) throws Exception {
        init(portname, rate, timeout);
    }

    public void setHardwareFlowControlMode(boolean enable)  throws Exception {
        if (enable)
            sPort.setFlowControlMode(
                SerialPort.FLOWCONTROL_NONE
            );
        else
            sPort.setFlowControlMode(
                SerialPort.FLOWCONTROL_RTSCTS_IN |
                SerialPort.FLOWCONTROL_RTSCTS_OUT
            );

    }

    public InputStream getInputStream() {
        return inStream;
    }

    public OutputStream getOutputStream() {
        return outStream;
    }

    public SerialPort getSerialPort() {
        return sPort;
    }

    public void close() throws IOException {
        sPort.close();
    }



    private InputStream inStream=null;
    private OutputStream outStream=null;
    private SerialPort sPort=null;;

    private void init(String portname, int rate, int timeout) throws Exception {

        CommPortIdentifier portId=null;

        boolean  located=false;
        Enumeration portList = CommPortIdentifier.getPortIdentifiers();
        if (!portList.hasMoreElements()) throw new IOException(\"no com port found\");
        while (portList.hasMoreElements()) {
            portId = (CommPortIdentifier) portList.nextElement();
            // System.err.println(\"CHECKING: \"+portId.getName());
            if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) {
                if (portId.getName().equals(portname)) {
                    located=true; break;
                }
            }
        }
        if (!located) throw new IOException(\"port \"+portname+\" not found\");
        // System.err.println(\"FOUND: \"+portId.getName());

        sPort = (SerialPort) portId.open(\"Java Simplified COM Port Access\", timeout);
        sPort.setSerialPortParams(rate,
            SerialPort.DATABITS_8,
            SerialPort.STOPBITS_1,
            SerialPort.PARITY_NONE);
        outStream = sPort.getOutputStream();       
        inStream = sPort.getInputStream();
    }

}