Java + Uno + RFID : 在 java 中调用读取 rfid 的方法

Question

我有一个问题，我可以从其他 class 调用方法到我的 JFrame

这是我的方法class，我从这个论坛的其他人那里得到的

    /*
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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());
        }
    }

}
}

我想从源代码底部的函数 "public void serialEvent(SerialPortEvent oEvent)" 中获取结果，当我尝试将其调用到另一个函数时，它没有显示出来。

我犯了什么错误？有人可以帮我吗？

Answer 1

方法public void serialEvent(SerialPortEvent oEvent)是在串口接收到东西时执行的（不打算自己调用），所以里面需要对接收到的东西进行处理，把它画出来（基于你的例子，注意里面的评论，你应该对收到的数据做些什么）：

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());
        }
    }

}

Java + Uno + RFID : 在 java 中调用读取 rfid 的方法

Java + Uno + RFID : call method read rfid in java

java

arduino

rfid

arduino-uno