java - setText() 显示和串行通信 (jSSC)

Question

我正在尝试读取 RFID 的 UID 并将其发送到 Netbeans，但是当我尝试显示字符串时，它只显示最后一位。 例如，当我扫描RFID时，UID是C945AA2A，但是当显示在文本字段上时，它只显示2A或有时只显示A。我应该怎么做才能在文本字段中显示完整的 uid？我希望 arduino 发送数据一次，即使扫描到新的 rfid，也不会发送任何内容

这是 Arduino 代码:

#include <SPI.h>
#include <MFRC522.h>

#define RST_PIN         9          // Configurable, see typical pin layout above
#define SS_PIN          10         // Configurable, see typical pin layout above

MFRC522 mfrc522(SS_PIN, RST_PIN);  // Create MFRC522 instance

void setup() {
    Serial.begin(9600);     // Initialize serial communications with the PC
    while (!Serial);        // Do nothing if no serial port is opened (added for Arduinos based on ATMEGA32U4)
    SPI.begin();            // Init SPI bus
    mfrc522.PCD_Init();     // Init MFRC522

    //mfrc522.PCD_DumpVersionToSerial();    // Show details of PCD - MFRC522 Card Reader details
    //Serial.println(F("Scan PICC to see UID, SAK, type, and data blocks..."));
}

void loop() {
    // Look for new cards
  String code = "";
    if ( ! mfrc522.PICC_IsNewCardPresent()) {
        return;
    }
    // Select one of the cards
    if ( ! mfrc522.PICC_ReadCardSerial()) {
        return;
    }
  for (byte i = 0; i < mfrc522.uid.size; i++) {
      code += String(mfrc522.uid.uidByte[i] < 0x10 ? "0" :"");
      code += String(mfrc522.uid.uidByte[i], HEX);
  }
  code.toUpperCase();
  Serial.println(code);
  mfrc522.PICC_HaltA();
}

这是 Netbeans 代码:

    public void detectPort(){
    String ports = getPortNames();
    SerialPort sPort = new SerialPort(ports);
    try{
        sPort.openPort();
        sPort.setParams(SerialPort.BAUDRATE_9600,
                SerialPort.DATABITS_8,
                SerialPort.STOPBITS_1,
                SerialPort.PARITY_NONE);
        sPort.setEventsMask(MASK_RXCHAR);
        sPort.addEventListener((SerialPortEvent serialPortEvent) -> {
            if(serialPortEvent.isRXCHAR()){
                try{
                    String st = sPort.readString();
                    jTextField1.setText(st);
                    jLabel2.setText(st);
               }catch(SerialPortException ex){
                    Logger.getLogger(SerialTest.class.getName())
                         .log(Level.SEVERE, null, ex);
               }   
            }
        });

    }catch(Exception e){
        System.out.print(e);
    }
}    

 public String getPortNames(){
    String defport = "";
    String[] ports = SerialPortList.getPortNames();
    for(String name: ports){
        for(int i = 0; i < ports.length; i++){
            jLabel1.setText(ports[i]);
            defport = ports[i];
        }
    }        
    return defport;                
}

Answer 1

我认为您的问题在于:

jTextField1.setText(st);

您可能希望将其添加到现有文本中，而不是设置文本。

jTextField1.setText(jTextField1.getText()+st);