Lectura y escritura basada en RFID en JAVA

I have to make a RFID based attendance system where i have to write into the database once reading from the tag and finding out which student it is.My query is how do i take input from the RFID tag.Does the input buffer classes of JAVA provided are enough for the input and output or do i have to take a different approach.

preguntado el 28 de agosto de 12 a las 13:08

2 Respuestas

You can use the Java Communications API for this. I am working on the same and java comm api and rxtx work perfectly well for this. I have a program written for this. Here you go:

import java.io.*;

import java.util.*;

import javax.comm.*;

public class SimpleRead implements Runnable, SerialPortEventListener {
    static CommPortIdentifier portId;
    static Enumeration portList;

    InputStream inputStream;
    SerialPort serialPort;
    Thread readThread;

    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("COM13")) {
            //                if (portId.getName().equals("/dev/term/a")) {
                    SimpleRead reader = new SimpleRead();
                 }
            }
        }
    }

    public SimpleRead() {
        try {
            serialPort = (SerialPort) portId.open("SimpleReadApp", 2000);
        } catch (PortInUseException e) {System.out.println(e);}
        try {
            inputStream = serialPort.getInputStream();
        } catch (IOException e) {System.out.println(e);}
        try {
            serialPort.addEventListener(this);
        } catch (TooManyListenersException e) {
            System.out.println(e);
        }
        serialPort.notifyOnDataAvailable(true);
        try {
            serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
        } catch (UnsupportedCommOperationException e) {
            System.out.println(e);
        }
        readThread = new Thread(this);
        readThread.start();
    }

    public void run() {
        try {
            Thread.sleep(20000);
        } catch (InterruptedException e) {System.out.println(e);}
    }

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

            try {
                while (inputStream.available() > 0) {
                    int numBytes = inputStream.read(readBuffer);
                }
                System.out.print(new String(readBuffer));
            } catch (IOException e) {System.out.println(e);}
            break;
        }
    }
}

Respondido el 29 de Septiembre de 15 a las 20:09

@Luffy apologies for coming back to this so late. Here is a link you can use to understand it in more detail. I have used the java communications api to communicate between the serial port. docs.oracle.com/cd/E17802_01/products/products/javacomm/… - Nirbhay Tandon

It has been a last years since I worked with RFID (ThinkMagic reader) and Java but every reader I used at the time had its own proprietary API. The JAR was only accessible with the purchase of the reader. Times may have changed, may be open source readers / implementations but check out the vendor site for your current make and model. The APIs are very straightforward once you have access to them.

Respondido el 09 de junio de 16 a las 08:06

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