Port Reader : COM Port « Development Class « Java

1. Java
2. Development Class
3. COM Port

Port Reader

 

import java.io.*;
import javax.comm.*;
import java.util.*;

public class PortReader SerialPortEventListener {
  static Enumeration ports;

  static CommPortIdentifier pID;

  InputStream inStream;

  SerialPort serPort;

  public PortReader() throws Exception{
    serPort = (SerialPort) pID.open("PortReader", 2000);
    inStream = serPort.getInputStream();

    serPort.addEventListener(this);

    serPort.notifyOnDataAvailable(true);

    serPort.setSerialPortParams(9600, SerialPort.DATABITS_8, SerialPort.STOPBITS_1,
        SerialPort.PARITY_NONE);
  }

  public void serialEvent(SerialPortEvent event) {
    switch (event.getEventType()) {
    case SerialPortEvent.BI:
      System.out.println("SerialPortEvent.BI occurred");
    case SerialPortEvent.OE:
      System.out.println("SerialPortEvent.OE occurred");
    case SerialPortEvent.FE:
      System.out.println("SerialPortEvent.FE occurred");
    case SerialPortEvent.PE:
      System.out.println("SerialPortEvent.PE occurred");
    case SerialPortEvent.CD:
      System.out.println("SerialPortEvent.CD occurred");
    case SerialPortEvent.CTS:
      System.out.println("SerialPortEvent.CTS occurred");
    case SerialPortEvent.DSR:
      System.out.println("SerialPortEvent.DSR occurred");
    case SerialPortEvent.RI:
      System.out.println("SerialPortEvent.RI occurred");
    case SerialPortEvent.OUTPUT_BUFFER_EMPTY:
      System.out.println("SerialPortEvent.OUTPUT_BUFFER_EMPTY occurred");
      break;
    case SerialPortEvent.DATA_AVAILABLE:
      System.out.println("SerialPortEvent.DATA_AVAILABLE occurred");
      byte[] readBuffer = new byte[20];

      try {
        while (inStream.available() > 0) {
          int numBytes = inStream.read(readBuffer);
        }
        System.out.print(new String(readBuffer));
      } catch (IOException ioe) {
        System.out.println("Exception " + ioe);
      }
      break;
    }
  }

  public static void main(String[] args) throws Exception{
    ports = CommPortIdentifier.getPortIdentifiers();

    while (ports.hasMoreElements()) {
      pID = (CommPortIdentifier) ports.nextElement();
      System.out.println("Port " + pID.getName());

      if (pID.getPortType() == CommPortIdentifier.PORT_SERIAL) {
        if (pID.getName().equals("COM1")) {
          PortReader pReader = new PortReader();
          System.out.println("COM1 found");
        }
      }
    }
  }

}

   
  

Related examples in the same category

1.	Querying Available COM Ports
2.	Printing a File
3.	List the ports
4.	Open a serial port using Java Communications
5.	Subclasses CommPortOpen and adds send/expect handling for dealing with Hayes-type modems
6.	Read from a Serial port, notifying when data arrives
7.	Choose a port, any port!
8.	Read from multiple Serial ports, notifying when data arrives on any
9.	Demonstrate the port conflict resolution mechanism
10.	Port Finder
11.	Port Sniffer
12.	Port Writer
13.	This program tries to do I/O in each direction using a separate Thread