SerialTest/src/sample/Controller.java

package sample;

import gnu.io.SerialPort;
import javafx.fxml.FXML;
import javafx.scene.control.Alert;
import javafx.scene.control.Button;
import javafx.scene.control.TextArea;
import javafx.scene.control.TextField;
import sample.utils.*;

import java.util.ArrayList;


public class Controller {

    @FXML
    Button writeButton;
    @FXML
    TextArea readTextarea;
    @FXML
    TextArea writeTextarea;
    @FXML
    TextField comName;
    // 串口
    SerialPort port = null;

    /** 开启串口
     *
     */
    @FXML
    public void startCom() {
        if(port != null){
            Alert alert = new Alert(Alert.AlertType.CONFIRMATION, "串口已经打开:" + port.getName());
            alert.show();
            return;
        }
        ArrayList<String> findPorts = SerialTool.findPort();
        if(findPorts.isEmpty()){
            Alert alert = new Alert(Alert.AlertType.CONFIRMATION, "未找到串口信息！");
            alert.show();
            return;
        }
        String portName = findPorts.get(0);//默认打开第一个串口
        // 设置使用的串口
        comName.setText(portName);
        try {
            port = SerialTool.openPort(portName, 9600);//打开串口
        } catch (RuntimeException e){
            Alert alert = new Alert(Alert.AlertType.ERROR, e.getMessage());
            alert.show();
            return;
        }

        SerialTool.addListener(port, () -> {
            byte[] data = null;
            try {
                if (port == null) {
                    System.out.println("串口对象为空，监听失败！");
                } else {
                    // 读取串口数据
                    data = SerialTool.readFromPort(port);
                    String resultHEX = SerialTool.byteArrayToHexString(data);
                    readTextarea.setText(resultHEX);
                }
            } catch (Exception e) {
                Alert alert = new Alert(Alert.AlertType.ERROR, "发生了一个异常:".concat(e.getMessage()));
                alert.show();
            }
        });

        Alert alert = new Alert(Alert.AlertType.CONFIRMATION, "串口开启成功！");
        alert.show();
    }

    /** 写入串口数据
     *
     */
    @FXML
    public void writeCom() {
        if(port == null){
            Alert alert = new Alert(Alert.AlertType.CONFIRMATION, "请先开启串口！");
            alert.show();
            return;
        }

        String content = writeTextarea.getText();
        if(content == null || content.trim().length() <=0){
            Alert alert = new Alert(Alert.AlertType.CONFIRMATION, "请填写写入的数据！");
            alert.show();
            return;
        }
        //设定发送字符串
        byte[] bs = SerialTool.hex2Bytes(content);
        SerialTool.sendToPort(port, bs);//写入,写入应该在监听器打开之后而不是之前
        Alert alert = new Alert(Alert.AlertType.CONFIRMATION, "写入成功！");
        alert.show();
    }
}