我想使用 jssc API 与支付终端进行通信。我发送了一个 ENQ 请求，但我没有回应。我的代码有什么问题？
谢谢
您可以在下面找到我的代码：
public class CommunicationTPE {
private int montant;
private int caisse = 1 ;
private int type = 0;
private static String port;
private static int bauRate = 9600;
private static int dataBits = 7;
private static int stopBits = 1;
private static int parity = 0;
private int current;
private String ENQ = "5",
ACK = "6",
NAK = "15",
STX = "2",
ETX = "3",
EOT = "4";
public static CommunicationTPE comm;
private SerialPort serialPort;
public static void initInstance(String port) {
comm = new CommunicationTPE();
comm.openCommunication(port);
}
public void openCommunication(String port) {
CommunicationTPE.port = port;
//serialPort.writeBytes(SerialPort.);//Write data to port
if (serialPort != null && serialPort.isOpened()) {
try {
serialPort.closePort();
} catch (SerialPortException ex) {
Logger.getLogger(CommunicationTPE.class.getName()).log(Level.SEVERE, null, ex);
}
}
serialPort = new SerialPort(port.trim());
try {
serialPort.openPort();//Open port
if (!serialPort.isOpened()) {
JOptionPane.showMessageDialog(null,"Terminal non détecté");
return;
}
// bauRate : data transfer rate, dataBits : number of data bits, stopBits : number of stop bits, parity : parity
serialPort.setParams(bauRate, dataBits, stopBits, parity);//Set params
int mask = SerialPort.MASK_RXCHAR + SerialPort.MASK_CTS + SerialPort.MASK_DSR + SerialPort.MASK_ERR + SerialPort.MASK_BREAK + SerialPort.MASK_RING + SerialPort.MASK_RLSD + SerialPort.MASK_RXFLAG + SerialPort.MASK_TXEMPTY;//Prepare mask
serialPort.setEventsMask(mask);//Set mask
serialPort.addEventListener(new SerialPortReader());//Add SerialPortEventListener
} catch (SerialPortException ex) {
Logger.getLogger(CommunicationTPE.class.getName()).log(Level.SEVERE, null, ex);
}
}
public void stopCommunication() {
try {
serialPort.closePort();
} catch (SerialPortException ex) {
System.out.println(ex);
}
}
public static CommunicationTPE getComm() {
return comm;
}
public void initData(float montant) {
this.montant = Math.round(montant * 100);
}
public void sendData() {
try {
if (serialPort == null || !serialPort.isOpened()) {
openCommunication(Session.PORT_COM);
}
if (serialPort.isOpened()) {
current = 0;
boolean result = serialPort.writeBytes(ENQ.getBytes());//Write data to port
if (!result) {
JOptionPane.showMessageDialog(null,"Envoie de données incomplet");
}
} else {
JOptionPane.showMessageDialog(null,"Terminal non détecté");
}
} catch (SerialPortException ex) {
System.out.println(ex);
}
}
private String sendCommandProtocolE() {
StringBuilder command = new StringBuilder();
// Numéro de caisse
String caisse = this.caisse + "";
while (caisse.length() < 2) caisse = "0" + caisse;
command.append(caisse);
String montant = this.montant + "";
while (montant.length() < 8) montant = "0" + montant;
command.append(montant);
// Mode de transaction, 1 = carte bancaire
command.append("1");
// Type de transaction, 0 = achat, 1 = remboursement, 2 = annulation, 4 = pré-autorisation
command.append(type);
// Code numérique pour la devise
command.append("978");
// Données privées
String data = "";
while (data.length() < 10) data = " " + data;
command.append(data);
return command.toString();
}
public class SerialPortReader implements SerialPortEventListener {
public void serialEvent(SerialPortEvent event) {
try {
//byte buffer[] = serialPort.readBytes(10);
//String value = new String(buffer, "ASCII");
String value = serialPort.readString();
if (value != null) {
if (value.trim().equals(ACK) && current == 0) {
serialPort.writeBytes(sendCommandProtocolE().getBytes());//Write data to port
current ++ ;
} else if (value.trim().equals(ACK) && current == 1) {
serialPort.writeBytes(EOT.getBytes());//Write data to port
}
} else {
}
} catch (SerialPortException ex) {
Logger.getLogger(CommunicationTPE.class.getName()).log(Level.SEVERE, null, ex);
// } catch (UnsupportedEncodingException ex) {
// Logger.getLogger(CommunicationTPE.class.getName()).log(Level.SEVERE, null, ex);
} catch (Exception ex) {
Logger.getLogger(CommunicationTPE.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
}