java实现 串口通讯

Java可以使用RXTXcomm库或JavaComm API实现串口通讯。以下是一个简单的示例程序，演示如何使用RXTXcomm库连接到串口设备并读取数据。

import gnu.io.*;

import java.io.*;

public class SerialCommunicationExample implements SerialPortEventListener {

    private SerialPort serialPort;

    public void connect(String portName) {
        try {
            CommPortIdentifier portIdentifier = CommPortIdentifier.getPortIdentifier(portName);

            if (portIdentifier.isCurrentlyOwned()) {
                System.err.println("Error: Port is currently in use");
            } else {
                CommPort commPort = portIdentifier.open(this.getClass().getName(), 2000);

                if (commPort instanceof SerialPort) {
                    serialPort = (SerialPort) commPort;
                    serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);

                    InputStream in = serialPort.getInputStream();
                    serialPort.addEventListener(this);
                    serialPort.notifyOnDataAvailable(true);

                } else {
                    System.err.println("Error: Only serial ports are handled by this example.");
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    public void serialEvent(SerialPortEvent serialPortEvent) {
        if (serialPortEvent.getEventType() == SerialPortEvent.DATA_AVAILABLE) {
            try {
                BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(serialPort.getInputStream()));
                String inputLine = bufferedReader.readLine();
                System.out.println("Received data: " + inputLine);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    public void disconnect() {
        try {
            serialPort.removeEventListener();
            serialPort.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        SerialCommunicationExample serialCommunicationExample = new SerialCommunicationExample();
        serialCommunicationExample.connect("COM1"); // Replace with the name of the serial port you want to connect to
    }
}

这个示例程序会监听串口设备的输入流，并在收到数据时打印到控制台上。要使用该示例程序，您需要安装RXTXcomm库并将其添加到Java项目的classpath中。