What OS?
----- Original Message -----
From: "Donald Horrell (BT)" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Saturday, October 02, 2004 9:04 AM
Subject: How do I configure Tomcat to write to a Serial Port?
> I've downloaded and installed the Java Communications API (version 2) and
> Tomcat 5.0.25. The whole lot uses Java 1.4.0.
>
> My servlet is below, but when I invoke it, I get a log and an exception:
> "Serial port is already in use."
> javax.servlet.ServletException
> comms.Send.init(Send.java:55)
> javax.servlet.GenericServlet.init(GenericServlet.java:211)
>
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117
) org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:793)
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConne
ction(Http11Protocol.java:702)
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:571)
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.jav
a:644) java.lang.Thread.run(Thread.java:536)At some point, I'm going to need
to find a way of limiting the poolsize forthis servlet to 1 only
too.CheersDon.--------------------------------Source:package comms;import
java.io.IOException;import java.io.OutputStream;import
java.io.PrintWriter;import java.util.Enumeration;import javax.comm.*;import
javax.servlet.ServletException;import javax.servlet.SingleThreadModel;import
javax.servlet.http.*;public class Send extends HttpServlet implements
SingleThreadModel{ /** The output stream which writes to the Com port. */
PrintWriter out = null; public void init() throws ServletException
{ // Open the serial port. Enumeration portList =
CommPortIdentifier.getPortIdentifiers(); while
(portList.hasMoreElements()) { CommPortIdentifier portId =
(CommPortIdentifier)portList.nextElement(); if (portId.getPortType()
== CommPortIdentifier.PORT_SERIAL) { //if
(portId.getName().equals("/dev/term/a")) { if
(portId.getName().equals("COM1")) { SerialPort
serialPort = null; try {
serialPort = (SerialPort)(portId.open("SendApplet",2000));
out = new PrintWriter(serialPort.getOutputStream());
serialPort.setSerialPortParams(9600,
SerialPort.DATABITS_8,
SerialPort.STOPBITS_1,
SerialPort.PARITY_NONE); } catch
(PortInUseException e) {
System.out.println("Serial port is already in use.");
throw(new ServletException()); } catch
(IOException e) { System.out.println("Failed
to connect to output stream."); throw(new
ServletException()); } catch
(UnsupportedCommOperationException e) {
System.out.println("Failed to set comms params.");
throw(new
rvletException()); } } } } }
public void destroy() { // Release the serial port. } public void
doGet(HttpServletRequest req, HttpServletResponse resp) {
System.out.println("doGet."); doWork(req, resp); } public void
doPost(HttpServletRequest req, HttpServletResponse resp) {
System.out.println("doPost."); doWork(req, resp); } public void
doWork(HttpServletRequest req, HttpServletResponse resp) { // Take
the msg param and send it to COM1. String msg =
req.getParameter("msg"); System.out.println("Sending["+msg+"].");
if (msg != null) { out.println(msg); } }}
>
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