RFID Bsed Attendece System In Java

RFID Based Attendence System


It Require Following jar file(jSSC.jar):-
https://code.google.com/p/java-simple-serial-connector/downloads/detail?name=jSSC-2.6.0-Release.zip&can=2&q=

Getting serial ports names

import jssc.SerialPortList;
public class Main {
   
    public static void main(String[] args) {
        String[] portNames = SerialPortList.getPortNames();
        for(int i = 0; i < portNames.length; i++){
            System.out.println(portNames[i]);
        }
    }
}

Writing data to serial port

import jssc.SerialPort;
import jssc.SerialPortException;
public class Main {

    public static void main(String[] args) {
        SerialPort serialPort = new SerialPort("COM1");
        try {
            serialPort.openPort();//Open serial port
            serialPort.setParams(SerialPort.BAUDRATE_9600, 
                                 SerialPort.DATABITS_8,
                                 SerialPort.STOPBITS_1,
                                 SerialPort.PARITY_NONE);//Set params. Also you can set params by this string: serialPort.setParams(9600, 8, 1, 0);
            serialPort.writeBytes("This is a test string".getBytes());//Write data to port
            serialPort.closePort();//Close serial port
        }
        catch (SerialPortException ex) {
            System.out.println(ex);
        }
    }
}

Reading data from serial port

import jssc.SerialPort;
import jssc.SerialPortException;
public class Main {

    public static void main(String[] args) {
        SerialPort serialPort = new SerialPort("COM1");
        try {
            serialPort.openPort();//Open serial port
            serialPort.setParams(9600, 8, 1, 0);//Set params.
            byte[] buffer = serialPort.readBytes(10);//Read 10 bytes from serial port
            serialPort.closePort();//Close serial port
        }
        catch (SerialPortException ex) {
            System.out.println(ex);
        }
    }
}

Event mask & SerialPortEventListener interface

Note: The mask is an additive quantity, thus to set a mask on the expectation of the arrival of Event Data (MASK_RXCHAR) and change the status lines CTS (MASK_CTS), DSR (MASK_DSR) we just need to combine all three masks.

import jssc.SerialPort;
import jssc.SerialPortEvent;
import jssc.SerialPortEventListener;
import jssc.SerialPortException;
public class Main {

    static SerialPort serialPort;

    public static void main(String[] args) {
        serialPort = new SerialPort("COM1"); 
        try {
            serialPort.openPort();//Open port
            serialPort.setParams(9600, 8, 1, 0);//Set params
            int mask = SerialPort.MASK_RXCHAR + SerialPort.MASK_CTS + SerialPort.MASK_DSR;//Prepare mask
            serialPort.setEventsMask(mask);//Set mask
            serialPort.addEventListener(new SerialPortReader());//Add SerialPortEventListener
        }
        catch (SerialPortException ex) {
            System.out.println(ex);
        }
    }
    
    /*
     * In this class must implement the method serialEvent, through it we learn about 
     * events that happened to our port. But we will not report on all events but only 
     * those that we put in the mask. In this case the arrival of the data and change the 
     * status lines CTS and DSR
     */
    static class SerialPortReader implements SerialPortEventListener {

        public void serialEvent(SerialPortEvent event) {
            if(event.isRXCHAR()){//If data is available
                if(event.getEventValue() == 10){//Check bytes count in the input buffer
                    //Read data, if 10 bytes available 
                    try {
                        byte buffer[] = serialPort.readBytes(10);
                    }
                    catch (SerialPortException ex) {
                        System.out.println(ex);
                    }
                }
            }
            else if(event.isCTS()){//If CTS line has changed state
                if(event.getEventValue() == 1){//If line is ON
                    System.out.println("CTS - ON");
                }
                else {
                    System.out.println("CTS - OFF");
                }
            }
            else if(event.isDSR()){///If DSR line has changed state
                if(event.getEventValue() == 1){//If line is ON
                    System.out.println("DSR - ON");
                }
                else {
                    System.out.println("DSR - OFF");
                }
            }
        }
    }
}

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REFERNCE :- 

https://code.google.com/p/java-simple-serial-connector/wiki/jSSC_example