java使用 rxtx 调用串口信息

大佬的文章
https://blog.youkuaiyun.com/wangmx1993328/article/details/88692848
这篇只做信息补充

rxtx 资源包地址
rxtx项目资源 x86 jar
https://download.youkuaiyun.com/download/ling_zhi_xin/89623027
rxtx项目资源 x64 jar
https://download.youkuaiyun.com/download/ling_zhi_xin/89623018

java 调用 串口信息 并获取信息， 具体SerialPortTool 采用上方大佬的工具类，
SerialPort addEventListener 实现读取信息的监听用来 使用

SerialPort com6 = SerialPortTool.openComPort("COM6", 9600, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
        Thread.sleep(2000);
        System.out.println(DateFormatUtils.format(new Date(), "yyyy-MM-dd hh:mm:ssZZ"));
        com6.notifyOnDataAvailable(true);
        BlockingQueue<Boolean> queue = new LinkedBlockingQueue<>();
        com6.addEventListener(new SerialPortEventListener() {
            @Override
            public void serialEvent(SerialPortEvent serialPortEvent) {
                System.out.println(serialPortEvent.getNewValue());

                if(serialPortEvent.getNewValue()){
                    try {
                        Thread.sleep(100);
                    } catch (InterruptedException e) {
                        throw new RuntimeException(e);
                    }
                    try {
                        System.out.println("erw: "+SerialPortTool.readData(com6));
                        queue.add(false);
                    } catch (IOException e) {
                        throw new RuntimeException(e);
                    }
                }
            }
        });
        String s="open";
        SerialPortTool.sendDataToComPort(com6,s.getBytes(StandardCharsets.UTF_8));
        while (true){
            if(queue.take()){
                break;
            }
        }
        SerialPortTool.closeComPort(com6);

读取方法补充

/**
     * 从串行端口读取数据
     *
     * @param serialPort 串行端口对象
     * @return 读取到的数据
     * @throws IOException 如果读取过程中出现异常
     */
    public static String readData(SerialPort serialPort) throws IOException {
        InputStream inputStream = serialPort.getInputStream();
        byte[] buffer = new byte[1024];
        int len;
        StringBuilder sb = new StringBuilder();
        while ((len = inputStream.read(buffer)) > 0) {
            String data = new String(buffer, 0, len, StandardCharsets.UTF_8);
            int index = data.indexOf('\n'); // 查找换行符的位置
            buffer = new byte[1024];
           if (index >= 0) {
               sb.append(data.substring(0, index)); // 添加数据到 StringBuilder
                break; // 找到换行符后结束循环
            } else {
               sb.append(data); // 如果没有找到换行符，继续读取数据
           }
        }
        return sb.toString();
    }