Sample Java program shows how to write to COM port using Java.
By: Johanes Printer Friendly Format
This Sample Java program shows how to write to COM port using Java.
If you are one of those living still in the 20th century then your JDK probably doesn't come with the Java COMM API. So you would have to download the Java Comm Api from http://java.sun.com/products/javacomm/. On the other hand if you are using one of the later versions of JDK then the Java Comm API should be inbuilt together with your JDK. Once you have this then create a sample program to read from the PC's COM port. And then copy and paste the below code into that program. Compile and run it. If the compilation fails then it is probably due to some classpath problem. You will have to add the javax.comm api to your classpath properly.
import java.io.*; import java.util.*; import javax.comm.*; public class SimpleWrite { static Enumeration portList; static CommPortIdentifier portId; static String messageString = "Hello, world!\n"; static SerialPort serialPort; static OutputStream outputStream; public static void main(String[] args) { portList = CommPortIdentifier.getPortIdentifiers(); while (portList.hasMoreElements()) { portId = (CommPortIdentifier) portList.nextElement(); if (portId.getPortType() == CommPortIdentifier.PORT_SERIAL) { if (portId.getName().equals("COM1")) { //if (portId.getName().equals("/dev/term/a")) { try { serialPort = (SerialPort) portId.open("SimpleWriteApp", 2000); } catch (PortInUseException e) {} try { outputStream = serialPort.getOutputStream(); } catch (IOException e) {} try { serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE); } catch (UnsupportedCommOperationException e) {} try { outputStream.write(messageString.getBytes()); } catch (IOException e) {} } } } } }
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Archived Comments
1. Hello,
I've got javax.comm and fol
View Tutorial By: Ashkan at 2009-12-19 21:51:19
2. Hello,
I've got javax.comm and fol
View Tutorial By: Ashkan at 2009-12-19 21:55:23
3. hai
i can run this program bt 1 exception
View Tutorial By: Raheela at 2010-05-25 21:59:38
4. i have a shimmer accelerometer(bluetooth). i need
View Tutorial By: jason at 2012-03-22 03:19:17
5. Hello,
i was run your given program in ecli
View Tutorial By: vishnu chauhan at 2013-01-24 11:42:16
6. Hello,
When I put the source code i
View Tutorial By: Pascal at 2013-03-25 09:12:47
7. import gnu.io.*;
import java.io.*;
<
View Tutorial By: Anonymous at 2013-03-29 02:39:00
8. Hi
I can compile it
root$ javac -cp
View Tutorial By: Tebogo Modiselle at 2014-10-31 08:47:09
9. how to write an byte array containing 10 different
View Tutorial By: sanjana at 2015-01-17 06:32:41
10. no output is shown
View Tutorial By: shubham bansal at 2015-02-21 15:36:31
11. no output as well, i'm getting portlist and portId
View Tutorial By: raul at 2015-10-09 20:05:02