无法从Java中的COM端口获取任何数据

我用GUI处理数据

@Override
        public void actionPerformed(ActionEvent event){ //Button reaction
            try {
                serialPort.openPort();
                serialPort.setParams(
                        SerialPort.BAUDRATE_9600,
                        SerialPort.DATABITS_8,
                        SerialPort.STOPBITS_1,
                        SerialPort.PARITY_NONE);

下面是从端口获取信息的侦听器

private class EventListener implements SerialPortEventListener {
        public String receivedData;
        public String noDataFromPort;

        public void serialEvent(SerialPortEvent event) {
            if(event.isRXCHAR() && event.getEventValue() > 0){
                try {
                    receivedData = serialPort.readString(event.getEventValue());
                    textField.setText(receivedData);
                    textArea.setText(receivedData + "\n");
                    serialPort.closePort();
                }
                catch (SerialPortException ex) {
                    noDataFromPort = "No data received";
                    textField.setText(noDataFromPort + " " + ex);
                    textArea.setText(noDataFromPort + " " + ex + "\n");
                }
            }
        }
    }

                serialPort.setFlowControlMode(
                        SerialPort.FLOWCONTROL_RTSCTS_IN |
                        SerialPort.FLOWCONTROL_RTSCTS_OUT);

try {
                    textField.setText(fromPort = serialPort.readString());
                    textField.setText(fromPort + s);
                    textField.setText(fromPort);
                    textArea.append(fromPort + s + "\n");
                } catch (SerialPortException e) {
                    textField.setText("No Data from " + serialPort.getPortName());
                    textArea.setText("No Data from " + serialPort.getPortName() + "\n");
                }


            }
        }

端口掩码

serialPort.addEventListener(new EventListener(), serialPort.MASK_RXCHAR);
                    //serialPort.addEventListener(new EventListener());
                    serialPort.writeString("R"); // Data for scale(R- get data from device)

                } catch (SerialPortException ex) {
                    portOpenFail = "Port"+ " " + serialPort.getPortName()+ " " + "not found" + " " + ex;
                }

这里我试图从端口输入信息

private class EventListener implements SerialPortEventListener {
        public String receivedData;
        public String noDataFromPort;

        public void serialEvent(SerialPortEvent event) {
            if(event.isRXCHAR() && event.getEventValue() > 0){
                try {
                    receivedData = serialPort.readString(event.getEventValue());
                    textField.setText(receivedData);
                    textArea.setText(receivedData + "\n");
                    serialPort.closePort();
                }
                catch (SerialPortException ex) {
                    noDataFromPort = "No data received";
                    textField.setText(noDataFromPort + " " + ex);
                    textArea.setText(noDataFromPort + " " + ex + "\n");
                }
            }
        }
    }

                serialPort.setFlowControlMode(
                        SerialPort.FLOWCONTROL_RTSCTS_IN |
                        SerialPort.FLOWCONTROL_RTSCTS_OUT);

try {
                    textField.setText(fromPort = serialPort.readString());
                    textField.setText(fromPort + s);
                    textField.setText(fromPort);
                    textArea.append(fromPort + s + "\n");
                } catch (SerialPortException e) {
                    textField.setText("No Data from " + serialPort.getPortName());
                    textArea.setText("No Data from " + serialPort.getPortName() + "\n");
                }


            }
        }

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请编辑您的问题，以正确格式化和缩进代码。看起来有些代码出现了问题，注释似乎打断了代码流