[英]Update JTextFields during an ActionPerformed in Java
我想在按鈕單擊操作完成之前完成一些代碼后,一個接一個地更新4個JTextField。 當前使用start()和join(),如下所示,但它僅在actionPerformed末尾進行更新。 任何想法?
public void jBsendActionPerformed(ActionEvent e) {
try{
selectedPort=jCports.getSelectedItem().toString();
//Thread t1;
Thread t1 = new Thread(new Runnable() {
@Override
public synchronized void run() {
try {
String data = "*"+jTx.getText()+jTy.getText()+jTx1.getText()+jTy1.getText()+jTl1.getText()+jTb1.getText()+"#";
obj.writeData(selectedPort, data);
String RFID1=obj.readData(selectedPort);
jTrfid1.setText(RFID1); // Want to update this textfield before executing the rest of the code, same for the next three textfields
System.out.println(RFID1);
} catch (SerialPortException ex) {
Logger.getLogger(RoboGUI.class.getName()).log(Level.SEVERE, null, ex);
}
}
});
t1.start();
t1.join();
Thread t2 = new Thread(new Runnable() {
@Override
public synchronized void run() {
try {
String data = "*"+jTx2.getText()+jTy2.getText()+jTl2.getText()+jTb2.getText()+"#";
obj.writeData(selectedPort, data);
String RFID2=obj.readData(selectedPort);
} catch (SerialPortException ex) {
Logger.getLogger(RoboGUI.class.getName()).log(Level.SEVERE, null, ex);
}
}
});
t2.start();
t2.join();
Thread t3 = new Thread(new Runnable() {
@Override
public synchronized void run() {
try {
String data = "*"+jTx3.getText()+jTy3.getText()+jTl3.getText()+jTb3.getText()+"#";
obj.writeData(selectedPort, data);
String RFID3=obj.readData(selectedPort);
jTrfid3.setText(RFID3);
System.out.println(RFID3);
} catch (SerialPortException ex) {
Logger.getLogger(RoboGUI.class.getName()).log(Level.SEVERE, null, ex);
}
}
});
t3.start();
t3.join();
Thread t4 = new Thread(new Runnable() {
@Override
public synchronized void run() {
try {
String data = "*"+jTx4.getText()+jTy4.getText()+jTl4.getText()+jTb4.getText()+"#";
obj.writeData(selectedPort, data);
String RFID4=obj.readData(selectedPort);
jTrfid4.setText(RFID4);
System.out.println(RFID4);
} catch (SerialPortException ex) {
}
}
});
t4.start();
t4.join();
}
我也嘗試了swingworker和swingutilites。 但仍然無法正常工作..請幫助..
您應該在ui線程(事件分派)上更新swing組件的狀態。 在您的情況下,請直接在jBsendActionPerformed方法中使用,而不要在其他線程上使用。 或調用SwingUtilities.invokeLater方法並在要從其他線程更新時使用此方法更新gui的狀態。
我認為更好的解決方案是使用搖擺工人。
public void jBsendActionPerformed(ActionEvent e) {
selectedPort=jCports.getSelectedItem().toString();
final String data = "*"+jTx.getText()+jTy.getText()+jTx1.getText()+jTy1.getText()+jTl1.getText()+jTb1.getText()+"#",
data1 = "*"+jTx2.getText()+jTy2.getText()+jTl2.getText()+jTb2.getText()+"#",
data2 = "*"+jTx3.getText()+jTy3.getText()+jTl3.getText()+jTb3.getText()+"#",
data3 = "*"+jTx4.getText()+jTy4.getText()+jTl4.getText()+jTb4.getText()+"#";
new SwingWorker<Void, String>() {
int messageInd = 0;
@Override
protected Void doInBackground() throws Exception {
//will be called on worker thread
try {
obj.writeData(selectedPort, data);
String RFID1=obj.readData(selectedPort);
push(RFID1);
System.out.println(RFID1);
} catch (SerialPortException ex) {
Logger.getLogger(RoboGUI.class.getName()).log(Level.SEVERE, null, ex);
}
try {
obj.writeData(selectedPort, data1);
String RFID2=obj.readData(selectedPort);
push(RFID2);
System.out.println(RFID2);
} catch (SerialPortException ex) {
Logger.getLogger(RoboGUI.class.getName()).log(Level.SEVERE, null, ex);
}
try {
obj.writeData(selectedPort, data2);
String RFID3=obj.readData(selectedPort);
push(RFID3);
System.out.println(RFID3);
} catch (SerialPortException ex) {
Logger.getLogger(RoboGUI.class.getName()).log(Level.SEVERE, null, ex);
}
try {
obj.writeData(selectedPort, data3);
String RFID4=obj.readData(selectedPort);
push(RFID4);
System.out.println(RFID4);
} catch (SerialPortException ex) {
}
return null;
}
@Override
protected void process(List<String> rfids) {
//will be called on ui thread
for(String rfid : rfids) {
if( messageInd==0 )
jTrfid1.setText(rfid);
else if( messageInd==1 )
jTrfid2.setText(rfid);
else if( messageInd==2 )
jTrfid3.setText(rfid);
else if( messageInd==3 )
jTrfid4.setText(rfid);
messageInd++;
}
}
}.execute();
}
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