java 操作串口代码

喜欢ヅ旅行 2022-11-29 11:43 188阅读 0赞

import gnu.io.*;
    
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.InputStreamReader;
    import java.io.OutputStream;
    import java.util.*;
    
    /**
     * 〈一句话功能简述〉<br>
     * 〈〉
     *
     * @author 
     * @create 2020-8-18
     * @since 1.0.0
     */
    public class SerialPortManager {
        private String portName = null;
        private SerialPort serialPort = null;
        private int baudrate = 9600;
    
        private InputStream inputStream;
        private OutputStream outputStream;
    
        public void init() {
            while (true) {
                try {
                    System.out.println("-main-menu----------------------------------------");
                    System.out.println("选择指令：");
                    System.out.println("1.查询com口");
                    System.out.println("2.设置com口");
                    System.out.println("3.进入模拟状态");
                    System.out.println("4.测试");
                    System.out.println("0.关闭");
                    System.out.println("-------------------------------------------------");
                    Scanner in = new Scanner(System.in);
                    String string = in.nextLine();
                    switch (Integer.parseInt(string)) {
                        case 1:
                            findAndShowPort();
                            break;
                        case 2:
                            changePort();
                            break;
                        case 3:
                            start();
                            break;
                        case 4:
                            sendToPort(serialPort, "AT+MSG=123".getBytes());
                            break;
                        case 0:
                            closePort(serialPort);
                            break;
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
    
            }
    
    
        }
    
        public void start() {
            if (serialPort != null) {
                serialPort.close();
            }
            if (portName == null) {
                System.out.println("portName is null");
            }
            serialPort = openPort(portName, baudrate);
            addListener(serialPort, new MySerialPortEventListener());
        }
    
        /**
         * 查找所有可用端口
         *
         * @return 可用端口名称列表
         */
        @SuppressWarnings("unchecked")
        public static final ArrayList<String> findPort() {
            // 获得当前所有可用串口
            Enumeration<CommPortIdentifier> portList = CommPortIdentifier.getPortIdentifiers();
            ArrayList<String> portNameList = new ArrayList<String>();
            // 将可用串口名添加到List并返回该List
            while (portList.hasMoreElements()) {
                String portName = portList.nextElement().getName();
                portNameList.add(portName);
            }
            return portNameList;
        }
    
        public void changePort() {
            System.out.println("请输入com口名称，区分大小写");
            Scanner in = new Scanner(System.in);
            portName = in.nextLine();
            System.out.println("设置成功，当前com口名称为:" + portName);
        }
    
        public static final ArrayList<String> findAndShowPort() {
            ArrayList<String> list = findPort();
            for (int n = 0; n < list.size(); n++) {
                System.out.println(n + 1 + "." + list.get(n));
            }
            return list;
        }
    
        /**
         * 打开串口
         *
         * @param portName 端口名称
         * @param baudrate 波特率
         * @return 串口对象
         * @throws SerialPortParameterFailure 设置串口参数失败
         * @throws NotASerialPort             端口指向设备不是串口类型
         * @throws NoSuchPort                 没有该端口对应的串口设备
         * @throws PortInUse                  端口已被占用
         */
        public SerialPort openPort(String portName, int baudrate) {
            try {
                // 通过端口名识别端口
                CommPortIdentifier portIdentifier = CommPortIdentifier.getPortIdentifier(portName);
                // 打开端口，设置端口名与timeout（打开操作的超时时间）
                CommPort commPort = portIdentifier.open(portName, 3000);
                // 判断是不是串口
                if (commPort instanceof SerialPort) {
                    SerialPort serialPort = (SerialPort) commPort;
    
                    try {
                        // 设置串口的波特率等参数
                        serialPort.setSerialPortParams(baudrate, SerialPort.DATABITS_8, SerialPort.STOPBITS_1, SerialPort.PARITY_NONE);
                        inputStream = serialPort.getInputStream();
                        outputStream = serialPort.getOutputStream();
                    } catch (UnsupportedCommOperationException e) {
                        e.printStackTrace();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                    return serialPort;
                } else {
                    // 不是串口
                    System.out.println("不是串口");
                }
            } catch (NoSuchPortException e1) {
                e1.printStackTrace();
            } catch (PortInUseException e2) {
                e2.printStackTrace();
            }
            return null;
        }
    
        /**
         * 关闭串口
         *
         * @param serialPort 待关闭的串口对象
         */
        public void closePort(SerialPort serialPort) {
            try {
                inputStream.close();
                outputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (serialPort != null) {
                serialPort.close();
                serialPort = null;
            }
        }
    
        /**
         * 向串口发送数据
         *
         * @param serialPort 串口对象
         * @param order      待发送数据
         * @throws SendDataToSerialPortFailure        向串口发送数据失败
         * @throws SerialPortOutputStreamCloseFailure 关闭串口对象的输出流出错
         */
        public void sendToPort(SerialPort serialPort, byte[] order) {
            try {
                outputStream.write(order);
                outputStream.flush();
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
    
            }
        }
    
        /**
         * 从串口读取数据
         *
         * @param serialPort 当前已建立连接的SerialPort对象
         * @return 读取到的数据
         * @throws ReadDataFromSerialPortFailure     从串口读取数据时出错
         * @throws SerialPortInputStreamCloseFailure 关闭串口对象输入流出错
         */
        public byte[] readFromPort(SerialPort serialPort) {
            byte[] bytes = null;
            try {
                // 获取buffer里的数据长度
                int bufflenth = inputStream.available();
                while (bufflenth != 0) {
                    // 初始化byte数组为buffer中数据的长度
                    bytes = new byte[bufflenth];
                    inputStream.read(bytes);
                    bufflenth = inputStream.available();
                }
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
            }
            return bytes;
        }
    
        public void readComm() {
            StringBuffer readBuffer = new StringBuffer();
            String scannedInput = "";
            Date currentTime = null;
            String TimeStamp = "";
            int c;
            char a;
            try {
                InputStreamReader fis = new InputStreamReader(inputStream, "utf-8");
                while ((c = inputStream.read()) != -1) {
                    readBuffer.append((char) c);
                }
                scannedInput = readBuffer.toString().trim();
                System.out.println(scannedInput);
            } catch (IOException ex) {
                ex.printStackTrace();
    
            } catch (Exception ex) {
    
                ex.printStackTrace();
            }
    
        }
    
    
        /**
         * 添加监听器
         *
         * @param port     串口对象
         * @param listener 串口监听器
         * @throws
         */
        public static void addListener(SerialPort port, SerialPortEventListener listener) {
            try {
                // 给串口添加监听器
                port.addEventListener(listener);
                // 设置当有数据到达时唤醒监听接收线程
                port.notifyOnDataAvailable(true);
                // 设置当通信中断时唤醒中断线程
                port.notifyOnBreakInterrupt(true);
            } catch (TooManyListenersException e) {
                //监听类对象过多
                e.printStackTrace();
            }
        }
    
        class MySerialPortEventListener implements SerialPortEventListener {
    
            @Override
            public void serialEvent(SerialPortEvent serialPortEvent) {
                if (serialPortEvent.getEventType() == SerialPortEvent.DATA_AVAILABLE) {
                    //收到数据
                    System.out.println("收到数据：");
                    readComm();
                } else {
                    System.out.println("sytem info");
                    System.out.print(" eventType:" + serialPortEvent.getEventType());
                    System.out.print(" NewValue:" + serialPortEvent.getNewValue());
                    System.out.print(" OldValue:" + serialPortEvent.getOldValue());
                    System.out.print(" Source:" + serialPortEvent.getSource());
                    System.out.println("sytem info");
                }
    
            }
        }
    }

以上代码还需要导入jar:![2020082009503739.png][]

到官网下发这个jar，然后下载的时候还有两个dll，有说明书会告诉你这两个dll放到哪里。我是放到了下面这个位置：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3NTQ5MDUw_size_16_color_FFFFFF_t_70][]

[2020082009503739.png]: /images/20221124/77aadfcbcb2640fea49056e243b5d067.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L20wXzM3NTQ5MDUw_size_16_color_FFFFFF_t_70]: /images/20221124/2128470c71784a6eae31462230554b0e.png