java 串口(java串口数据读取的方法是什么)

在Java中,可以使用RXTXcomm库或JSerialComm库来读取串口数据。
1. 使用RXTXcomm库:
首先,你需要下载并安装RXTXcomm库。
然后,使用RXTXcomm库中的SerialPort类来打开串口连接,例如:

importgnu.io.CommPortIdentifier;
     import gnu.io.SerialPort;
     import gnu.io.SerialPortEvent;
     import gnu.io.SerialPortEventListener;
     import gnu.io.UnsupportedCommOperationException;
     
     import java.io.bufferedReader;
     import java.io.IOException;
     import java.io.InputStreamReader;
     import java.io.OutputStream;
     
     public class SerialPortreader implements SerialPortEventListener {
     
         private BufferedReader input;
         private OutputStream output;
     
         public SerialPortReader() {
             try {
                 // 获取串口标识符
                 CommPortIdentifier portId = CommPortIdentifier.getPortIdentifier(“COM1”);
                 // 打开串口连接
                 SerialPort serialPort = (SerialPort) portId.open(“SerialPortReader”, 2000);
                 // 设置串口参数
                 serialPort.setSerialPortParams(9600, SerialPort.DATABITS_8, SerialPort.
                 STOPBITS_1, SerialPort.PARITY_NONE);
                 // 获取输入输出流
                 input = new BufferedReader(new InputStreamReader(serialPort.getInputStream()));
                 output = serialPort.getOutputStream();
                 // 添加串口事件监听器
                 serialPort.addeventlistener(this);
                 serialPort.notifyOnDataAvailable(true);
             } catch (Exception e) {
                 e.printStackTrace();
             }
         }
     
         @Override
         public void serialEvent(SerialPortEvent event) {
             // 串口数据可用时触发该事件
             if (event.getEventType() == SerialPortEvent.DATA_AVAILABLE) {
                 try {
                     // 读取串口数据
                     String inputLine = input.readline();
                     System.out.println(“接收到的数据:” + inputLine);
                 } catch (IOException e) {
                     e.printStackTrace();
                 }
             }
         }
     
         public void sendData(String data) {
             try {
                 // 发送数据到串口
                 output.write(data.getBytes());
             } catch (IOException e) {
                 e.printStackTrace();
             }
         }
     
         public static void main(String[] args) {
             SerialPortReader reader = new SerialPortReader();
             reader.sendData(“Hello, Serial Port!”);
         }
     }

在控制台输出会接收到的串口数据。
2. 使用JSerialComm库:
首先,你需要下载并导入JSerialComm库。
然后,使用JSerialComm库中的SerialPort类来打开串口连接,例如:

    import com.fazecast.jSerialComm.SerialPort;
     import com.fazecast.jSerialComm.SerialPortDataListener;
     import com.fazecast.jSerialComm.SerialPortEvent;
     
     public class SerialPortReader {
     
         public SerialPortReader() {
             // 获取串口列表
             SerialPort[] ports = SerialPort.getCommPorts();
             if (ports.length > 0) {
                 // 打开第一个串口连接
                 SerialPort serialPort = ports[0];
                 serialPort.openPort();
                 // 设置串口参数
                 serialPort.setBaudRate(9600);
                 serialPort.setNumDataBits(8);
                 serialPort.setNumStopBits(1);
                 serialPort.setParity(SerialPort.NO_PARITY);
                 // 添加串口数据监听器
                 serialPort.addDataListener(new SerialPortDataListener() {
                     @Override
                     public int getListeningEvents() {
                         return SerialPort.LISTENING_EVENT_DATA_AVAILABLE;
                     }
     
                     @Override
                     public void serialEvent(SerialPortEvent event) {
                         if (event.getEventType() == SerialPort.LISTENING_EVENT_DATA_
                         AVAILABLE) {
                             // 读取串口数据
                             byte[] buffer = new byte[serialPort.bytesAvailable()];
                             int bytesRead = serialPort.readBytes(buffer, buffer.length);
                             String inputLine = new String(buffer, 0, bytesRead);
                             System.out.println(“接收到的数据:” + inputLine);
                         }
                     }
                 });
             }
         }
     
         public static void main(String[] args) {
             SerialPortReader reader = new SerialPortReader();
         }
     }

在控制台输出会接收到的串口数据。
这些示例代码演示了如何打开串口连接、设置串口参数、读取串口数据。你可以根据自己的需求进行相应的修改。