<!--串口連接工具-->
<dependency>
    <groupId>com.fazecast</groupId>
    <artifactId>jSerialComm</artifactId>
    <version>[2.0.0,3.0.0)</version>
</dependency>

package com.jinfu.core;
import com.fazecast.jSerialComm.SerialPort;
import lombok.extern.slf4j.Slf4j;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;
@Slf4j
public class SerialPortManager {
    //查找所有可用端口
    public static List<String> findPorts() {
        // 獲得當(dāng)前所有可用串口
        SerialPort[] serialPorts = SerialPort.getCommPorts();
        List<String> portNameList = new ArrayList<String>();
        // 將可用串口名添加到List并返回該List
        for(SerialPort serialPort:serialPorts) {
            portNameList.add(serialPort.getSystemPortName());
        }
        //去重
        portNameList = portNameList.stream().distinct().collect(Collectors.toList());
        return portNameList;
    }
    /**
     * 打開串口
     *
     * @param portName  端口名稱
     * @param baudRate  波特率
     * @return 串口對(duì)象
     */
    public static SerialPort openPort(String portName, Integer baudRate) {
        SerialPort serialPort = SerialPort.getCommPort(portName);
        if (baudRate != null) {
            serialPort.setBaudRate(baudRate);
        }
        if (!serialPort.isOpen()) {　　　　　　 //開啟串口
           serialPort.openPort(1000);
        }else{
            return serialPort;
        }
        // 設(shè)置一下串口的波特率等參數(shù)
        // 數(shù)據(jù)位：8
        // 停止位：1
        // 校驗(yàn)位：None
        serialPort.setFlowControl(SerialPort.FLOW_CONTROL_DISABLED);
        serialPort.setComPortParameters(baudRate, 8, SerialPort.ONE_STOP_BIT, SerialPort.NO_PARITY);
        serialPort.setComPortTimeouts(SerialPort.TIMEOUT_READ_BLOCKING | SerialPort.TIMEOUT_WRITE_BLOCKING, 1000, 1000);
        return serialPort;
    }
    /**
     * 關(guān)閉串口
     * @param serialPort    待關(guān)閉的串口對(duì)象
     */
    public static void closePort(SerialPort serialPort) {
        if (serialPort != null && serialPort.isOpen()){
            serialPort.closePort();
        }
    }
    /**
     * 往串口發(fā)送數(shù)據(jù)
     * @param serialPort    串口對(duì)象
     * @param content       待發(fā)送數(shù)據(jù)
     */
    public static void sendToPort(SerialPort serialPort,byte[] content) {
        if (!serialPort.isOpen()) {
            return;
        }
        serialPort.writeBytes(content, content.length);
    }
    /**
     * 從串口讀取數(shù)據(jù)
     * @param serialPort    當(dāng)前已建立連接的SerialPort對(duì)象
     * @return 讀取到的數(shù)據(jù)
     */
    public static byte[] readFromPort(SerialPort serialPort) {
        byte[] reslutData = null;
        try {
            if (!serialPort.isOpen()){return null;};
            int i=0;
            while (serialPort.bytesAvailable() > 0 && i++ < 5) Thread.sleep(20);
            byte[] readBuffer = new byte[serialPort.bytesAvailable()];
            int numRead = serialPort.readBytes(readBuffer, readBuffer.length);
            if (numRead > 0) {
                reslutData = readBuffer;
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        return reslutData;
    }
    /**
     * 添加監(jiān)聽器
     * @param serialPort    串口對(duì)象
     * @param listener  串口存在有效數(shù)據(jù)監(jiān)聽
     */
    public static void addListener(SerialPort serialPort, DataAvailableListener listener) {
        try {
            // 給串口添加監(jiān)聽器
            serialPort.addDataListener(new SerialPortListener(listener));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

import com.fazecast.jSerialComm.SerialPort;
import com.fazecast.jSerialComm.SerialPortDataListener;
import com.fazecast.jSerialComm.SerialPortEvent;
import lombok.extern.slf4j.Slf4j;
/**
 * 串口監(jiān)聽
 */
@Slf4j
public class SerialPortListener implements SerialPortDataListener {
    private DataAvailableListener mDataAvailableListener;
    public SerialPortListener(DataAvailableListener mDataAvailableListener) {
        this.mDataAvailableListener = mDataAvailableListener;
    }
    @Override
    public int getListeningEvents() {　　　　　//必須是return這個(gè)才會(huì)開啟串口工具的監(jiān)聽
        return SerialPort.LISTENING_EVENT_DATA_AVAILABLE;
    }
    public void serialEvent(SerialPortEvent serialPortEvent) {
        if (mDataAvailableListener != null) {
            mDataAvailableListener.dataAvailable();
        }
    }
}
　　/**
     * 串口存在有效數(shù)據(jù)監(jiān)聽
     */
    public interface DataAvailableListener {
        /**
         * 串口存在有效數(shù)據(jù)
         */
        void dataAvailable();
    }

/** 
     * @throws PortInUseException   串口已經(jīng)被占用
     */
    public static void main(String[] args) throws PortInUseException {//打開串口，返回一個(gè)串口對(duì)象 參數(shù)：串口號(hào) 波特率
        SerialPort serialPort = SerialPortManager.openPort("COM1", 10000);
        //給當(dāng)前串口對(duì)象設(shè)置監(jiān)聽器
        SerialPortManager.addListener(serialPort, new DataAvailableListener() {
            @Override
            public void dataAvailable() {
                //當(dāng)前監(jiān)聽器監(jiān)聽到的串口返回?cái)?shù)據(jù) back
                byte[] back = SerialPortManager.readFromPort(serialPort);
            }
        });
        //當(dāng)前向串口發(fā)送的數(shù)據(jù)（模擬假數(shù)據(jù)）
        byte[] content = new byte[10];
        //向當(dāng)前串口發(fā)送數(shù)據(jù)
        SerialPortManager.sendToPort(serialPort,content);
    }