Java 错误：无法从静态上下文引用非静态方法readstring

我试图通过串行端口类通过COM端口发送数据，并通过COM端口接收数据，但出现此问题

多谢各位

import jssc.SerialPort;
import jssc.SerialPortException;
import jssc.*;

public class writeValues {


    public static void main(String[] args) {
        SerialPort serialPort = new SerialPort("COM1");
        try {
            //Open port
            String T;
            serialPort.openPort();
            serialPort.setParams(2400,7,2,1, false, true);
            String bytes = serialPort.readString(); //Reads 10 bytes from serial port
            serialPort.addEventListener(new PortReader(), SerialPort.MASK_RXCHAR);
            serialPort.writeString("connected.");
            //serialPort.closePort();
        }
        catch (SerialPortException ex) {
            System.out.println(ex);
        }
    }

    public static class PortReader implements SerialPortEventListener {

        @Override
        public void serialEvent(SerialPortEvent event) {
            if(event.isRXCHAR() && event.getEventValue() > 0) {
                try {
                    String receivedData = SerialPort.readString(event.getEventValue());
                    System.out.println("Received response: " + receivedData);
                }
                catch (SerialPortException ex) {

                    System.out.println("Error in receiving string from COM-port: " + ex);
                }
            }
        }

    }

}

---

由于SerialPort类不是静态的-（您调用了SerialPort=new SerialPort（）对吗？）您需要在该实例“SerialPort”上调用readstring，而不是在SerialPort类上调用readstring。你所能做的就是改变

public class writeValues {

public static SerialPort serialPort;
public static void main(String[] args) {
    serialPort = new SerialPort("COM1");
    try {
        //Open port
        String T;
        serialPort.openPort();
        serialPort.setParams(2400,7,2,1, false, true);
        String bytes = serialPort.readString(); //Reads 10 bytes from serial port
        serialPort.addEventListener(new PortReader(), SerialPort.MASK_RXCHAR);
        serialPort.writeString("connected.");
        //serialPort.closePort();
    }
    catch (SerialPortException ex) {
        System.out.println(ex);
    }
}

public static class PortReader implements SerialPortEventListener {

    @Override
    public void serialEvent(SerialPortEvent event) {
        if(event.isRXCHAR() && event.getEventValue() > 0) {
            try {
                String receivedData = serialPort.readString(event.getEventValue());
                System.out.println("Received response: " + receivedData);
            }
            catch (SerialPortException ex) {

                System.out.println("Error in receiving string from COM-port: " + ex);
            }
        }
    }

}

---

因此，现在我们引用的是serialPort实例，而不是静态类serialPort。希望对您有所帮助：

String receivedData=SerialPort.readString（event.getEventValue（））。您正在类（不是实例）上调用
readString（）
。这对于非静态方法是不允许的。在
main（）。