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$Http11ConnectionHandler.processConnection(Http11Protocol.java:702)
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:571) org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java: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 ServletException()); } } } } } 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); } }}
---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
