用java + fxml 做一个串口调试助手，并能够在输入框输入十六进制S/N码并通过串口存入，在fxml显示

下面是一个使用JavaFX和Java Comm API实现的串口调试助手，可以在输入框中输入十六进制S/N码并通过串口存入，并在界面上显示串口发送和接收的数据：

import gnu.io.CommPortIdentifier;
import gnu.io.SerialPort;
import javafx.application.Platform;
import javafx.fxml.FXML;
import javafx.scene.control.*;
import javafx.scene.input.KeyCode;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Enumeration;

public class Controller {

    @FXML
    private TextArea logTextArea;
    @FXML
    private TextField sendTextField;
    @FXML
    private CheckBox hexCheckBox;
    @FXML
    private Label statusLabel;

    private SerialPort serialPort;
    private InputStream inputStream;
    private OutputStream outputStream;

    public void initialize() {
        // 监听串口数据
        Thread thread = new Thread(() -> {
            byte[] buffer = new byte[1024];
            int len;
            try {
                while (true) {
                    if (inputStream != null && (len = inputStream.read(buffer)) > 0) {
                        String data = new String(buffer, 0, len);
                        Platform.runLater(() -> logTextArea.appendText(data));
                    }
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        });
        thread.setDaemon(true);
        thread.start();
    }

    public void connectSerialPort() {
        Enumeration portList = CommPortIdentifier.getPortIdentifiers();
        while (portList.hasMoreElements()) {
            CommPortIdentifier portIdentifier = (CommPortIdentifier) portList.nextElement();
            if (portIdentifier.getPortType() == CommPortIdentifier.PORT_SERIAL) {
                String name = portIdentifier.getName();
                try {
                    SerialPort serialPort = (SerialPort) portIdentifier.open("SerialPort", 2000);
                    serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
                    inputStream = serialPort.getInputStream();
                    outputStream = serialPort.getOutputStream();
                    this.serialPort = serialPort;
                    statusLabel.setText(name + "已连接");
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    }

    public void disconnectSerialPort() {
        if (serialPort != null) {
            serialPort.close();
            serialPort = null;
            statusLabel.setText("串口已断开");
        }
    }

    public void send() {
        String data = sendTextField.getText();
        if (hexCheckBox.isSelected()) {
            data = data.replaceAll("\\s+", "");
            byte[] bytes = hexStringToBytes(data);
            if (bytes != null && bytes.length > 0) {
                try {
                    outputStream.write(bytes);
                    outputStream.flush();
                    logTextArea.appendText("发送: " + data + "\n");
                    sendTextField.clear();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        } else {
            try {
                outputStream.write(data.getBytes());
                outputStream.flush();
                logTextArea.appendText("发送: " + data + "\n");
                sendTextField.clear();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    private byte[] hexStringToBytes(String hexString) {
        if (hexString == null || hexString.equals("")) {
            return null;
        }
        hexString = hexString.toUpperCase();
        int length = hexString.length() / 2;
        char[] hexChars = hexString.toCharArray();
        byte[] bytes = new byte[length];
        for (int i = 0; i < length; i++) {
            int pos = i * 2;
            bytes[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));
        }
        return bytes;
    }

    private byte charToByte(char c) {
        return (byte) "0123456789ABCDEF".indexOf(c);
    }

    public void clearLog() {
        logTextArea.clear();
    }

    public void onSendTextFieldKeyPressed(javafx.scene.input.KeyEvent keyEvent) {
        if (keyEvent.getCode() == KeyCode.ENTER) {
            send();
        }
    }

}

在FXML文件中，使用TextArea、TextField、CheckBox和Label分别绑定对应的方法即可实现功能。需要注意的是，在连接串口时需要将串口通信参数修改为实际的参数。另外，在发送数据时可以选择将数据转换为十六进制格式。