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import javax.comm.*;

//import com.sun.comm.Win32Driver;

import java.util.*;

public class com_port {

public static void main(String args[]) throws Exception {

// List portNames

Enumeration ports = CommPortIdentifier.getPortIdentifiers();

while (ports.hasMoreElements()) {

CommPortIdentifier portId = (CommPortIdentifier)ports.nextElement();

String s = getPortInfo(portId);

System.out.println(s);

}

// test open-close methods on each port

ports = CommPortIdentifier.getPortIdentifiers();

while (ports.hasMoreElements()) {

CommPortIdentifier portId = (CommPortIdentifier)ports.nextElement();

CommPort port = null;

try {

System.out.print("open " + portId.getName());

port = portId.open(portId.getName(), 2000);

port.close();

System.out.println("...closed");

} catch (Exception ex) {

ex.printStackTrace();

if (port != null)

try { port.close(); } catch (Exception e) { }

}

}

}

private static String getPortInfo(CommPortIdentifier portid) {

StringBuffer sb = new StringBuffer();

sb.append(portid.getName());

sb.append(", ");

sb.append("portType: ");

if (portid.getPortType() == CommPortIdentifier.PORT_SERIAL)

sb.append("serial");

else if (portid.getPortType() == CommPortIdentifier.PORT_PARALLEL)

sb.append("parallel");

else

sb.append("unknown");

return sb.toString();

}

}