Java + Uno + RFID：在java中调用方法读取rfid

Question

i have a problem that i can call the method from other class into my JFrame

this my method class which i got from other people in this forum

    /*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

package transaksi_satu;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStream;
import gnu.io.CommPortIdentifier; 
import gnu.io.SerialPort;
import gnu.io.SerialPortEvent; 
import gnu.io.SerialPortEventListener; 
import java.util.Enumeration;


public class UnoConnect implements SerialPortEventListener{

    SerialPort serialPort;

    private static final String PORT_NAMES[] = {"COM3"};
    private BufferedReader input;
    private OutputStream output1;
    private static final int TIME_OUT = 2000;
    private static final int DATA_RATE = 9600;

    public UnoConnect(){
    CommPortIdentifier portId = null;
    Enumeration portEnum = CommPortIdentifier.getPortIdentifiers();

    //First, Find an instance of serial port as set in PORT_NAMES.
    while (portEnum.hasMoreElements()) {
        CommPortIdentifier currPortId = (CommPortIdentifier) portEnum.nextElement();
        for (String portName : PORT_NAMES) {
            if (currPortId.getName().equals(portName)) {
                portId = currPortId;
                break;
            }
        }
    }
    if (portId == null) {
        System.out.println("Could not find COM port.");
        return;
    }

    try {
        serialPort = (SerialPort) portId.open(this.getClass().getName(),
                TIME_OUT);
        serialPort.setSerialPortParams(DATA_RATE,
                SerialPort.DATABITS_8,
                SerialPort.STOPBITS_1,
                SerialPort.PARITY_NONE);

        // open the streams
        input = new BufferedReader(new InputStreamReader(serialPort.getInputStream()));
        output1 = serialPort.getOutputStream();

        serialPort.addEventListener(this);
        serialPort.notifyOnDataAvailable(true);
    } catch (Exception e) {
        System.err.println(e.toString());
    }



    }
    public void close() {
    if (serialPort != null) {
        serialPort.removeEventListener();
        serialPort.close();
    }
}

public void serialEvent(SerialPortEvent oEvent) {
    if (oEvent.getEventType() == SerialPortEvent.DATA_AVAILABLE) {
        try {
            String inputLine=null;
            if (input.ready()) {
                inputLine = input.readLine();
                            System.out.println(inputLine);
                            //Lbl_ID.setText(inputLine);                
            }

        } catch (Exception e) {
            System.err.println(e.toString());
        }
    }

}
}

i want get the result from function "public void serialEvent(SerialPortEvent oEvent)" at the bottom of source code, when i try to call it into another from it doesn't show up.

what mistake i make? can someone help me?

Answer 1

The method public void serialEvent(SerialPortEvent oEvent) is executed when something is received from serial port (it is not intended to be called by yourself), so inside it you need to process what is received, to picture it (based on your example, pay attention to the comments inside, there you should do something with the received data):

public void serialEvent(SerialPortEvent oEvent) {
    if (oEvent.getEventType() == SerialPortEvent.DATA_AVAILABLE) {
        try {
            String inputLine=null;
            if (input.ready()) {
                inputLine = input.readLine();
                            System.out.println(inputLine);
                            // DO SOMETHING WITH THE inputLine RECEIVED HERE 
                            // EG. PASS IT TO SOME OTHER SERVICE METHOD

            }

        } catch (Exception e) {
            System.err.println(e.toString());
        }
    }

}