Java串口通信入门

import gnu.io.CommPort;
import gnu.io.CommPortIdentifier;
import gnu.io.SerialPort;
import java.io.InputStream;
import java.io.OutputStream;

CommPortIdentifier portIdentifier = CommPortIdentifier.getPortIdentifier("/dev/ttyUSB0");
if (portIdentifier.isCurrentlyOwned()) {
    System.out.println("Error: Port is currently in use");
} else {
    CommPort commPort = portIdentifier.open(this.getClass().getName(), 2000);
    if (commPort instanceof SerialPort) {
        SerialPort serialPort = (SerialPort) commPort;
        serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
        InputStream in = serialPort.getInputStream();
        OutputStream out = serialPort.getOutputStream();
        // 进行串口通信
    } else {
        System.out.println("Error: Only serial ports are handled by this example");
    }
}

try {
    // 发送数据
    out.write("Hello, Serial Port!".getBytes());

    // 接收数据
    byte[] buffer = new byte[1024];
    int len = in.read(buffer);
    String receivedData = new String(buffer, 0, len);
    System.out.println("Received data: " + receivedData);
} catch (Exception e) {
    e.printStackTrace();
}

serialPort.close();

try {
    // 发送数据
    String data = "Hello, Serial Port!";
    out.write(data.getBytes());
    System.out.println("Sent data: " + data);
} catch (Exception e) {
    e.printStackTrace();
}

try {
    // 接收数据
    byte[] buffer = new byte[1024];
    int len = in.read(buffer);
    String receivedData = new String(buffer, 0, len);
    System.out.println("Received data: " + receivedData);
} catch (Exception e) {
    e.printStackTrace();
}

try {
    // 创建一个线程来监听串口数据
    Thread thread = new Thread(() -> {
        try {
            byte[] buffer = new byte[1024];
            while (true) {
                int len = in.read(buffer);
                String receivedData = new String(buffer, 0, len);
                System.out.println("Received data: " + receivedData);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    });
    thread.start();
} catch (Exception e) {
    e.printStackTrace();
}