java串口通讯demo

以下是一个简单的Java串口通信Demo：

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;
import gnu.io.CommPortIdentifier;
import gnu.io.PortInUseException;
import gnu.io.SerialPort;
import gnu.io.SerialPortEvent;
import gnu.io.SerialPortEventListener;
import gnu.io.UnsupportedCommOperationException;

public class SerialComm implements SerialPortEventListener {

    private SerialPort serialPort;
    private InputStream inputStream;
    private OutputStream outputStream;
    private static final int BAUD_RATE = 9600;
    private static final int DATA_BITS = 8;
    private static final int STOP_BITS = 1;
    private static final int PARITY = SerialPort.PARITY_NONE;

    public static void main(String[] args) {
        SerialComm serialComm = new SerialComm();
        serialComm.searchForPorts();
        serialComm.connect();
    }

    public void searchForPorts() {
        Enumeration portList = CommPortIdentifier.getPortIdentifiers();
        while (portList.hasMoreElements()) {
            CommPortIdentifier port = (CommPortIdentifier) portList.nextElement();
            if (port.getPortType() == CommPortIdentifier.PORT_SERIAL) {
                System.out.println(port.getName());
            }
        }
    }

    public void connect() {
        CommPortIdentifier portIdentifier;
        try {
            portIdentifier = CommPortIdentifier.getPortIdentifier("COM3");
            if (portIdentifier.isCurrentlyOwned()) {
                System.out.println("Port is currently in use");
            } else {
                serialPort = (SerialPort) portIdentifier.open(this.getClass().getName(), 2000);

                serialPort.setSerialPortParams(BAUD_RATE, DATA_BITS, STOP_BITS, PARITY);

                inputStream = serialPort.getInputStream();
                outputStream = serialPort.getOutputStream();

                serialPort.addEventListener(this);
                serialPort.notifyOnDataAvailable(true);

                System.out.println("Connected to port: " + portIdentifier.getName());
            }
        } catch (PortInUseException | UnsupportedCommOperationException | IOException | gnu.io.NoSuchPortException e) {
            System.out.println(e.toString());
        }
    }

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

    @Override
    public void serialEvent(SerialPortEvent spe) {
        if (spe.getEventType() == SerialPortEvent.DATA_AVAILABLE) {
            try {
                int availableBytes = inputStream.available();
                byte[] bytes = new byte[availableBytes];
                inputStream.read(bytes, 0, availableBytes);
                System.out.println(new String(bytes));
            } catch (IOException e) {
                System.out.println(e.toString());
            }
        }
    }
}

这个Demo演示了如何搜索计算机上可用的串口，连接到指定的串口，读取串口数据并在控制台上显示。你可以根据自己的需求对代码进行修改。