1

I am trying to append a string I get from my client program. However I made it so that the append statement is in a while loop. Does this have an affect in not working in real time?

For areas like 

   tfFIXMsg.append( inputLine + "\n\n\n");

and

       tfCSVLine.append(outputLine+"\n\n\n");

It will not show the message on the textArea UNTIL the while loop is done. How can I make it so that it will continue to recieve messages from client, and be able to output it onto the textArea in realtime 

try {
    while ((inputLine = in.readLine()) != null) 
          { 
           System.out.println ("Server: " + inputLine); 


           tfFIXMsg.append( inputLine + "\n\n\n");


           int pos = inputLine.indexOf(inputLine, 0);
           h.addHighlight(50, 60, DefaultHighlighter.DefaultPainter);



           if (inputLine.trim().equals("Bye.")) {
               System.out.println("Exit program"); 
               break;
               } 

           Scanner input1 = new Scanner(new File(csvName));
           Scanner input2 = new Scanner(new File(csvName));
           Scanner input3 = new Scanner(new File(csvName));
           Scanner input4 = new Scanner(new File(csvName));


           String csvline = getCsvLineVal (getLocation34CSV(getTag34Value(Tag34Location(getTagCSV( parseFixMsg(inputLine ,inputLine))), getValueCSV( parseFixMsg(inputLine ,inputLine))), getVal34(input1,  input2)), getCSVLine( input3,  input4) );
           outputLine = compareClientFixCSV( getTagCSV( parseFixMsg(inputLine ,inputLine)), getValueCSV(parseFixMsg(inputLine ,inputLine)), getCSVTag(csvline), getCSVValue(csvline));

           out.println(outputLine);
           tfCSVLine.append(outputLine+"\n\n\n");

           input1.close();
           input2.close();
           input3.close();
           input4.close();



          }
} catch (FileNotFoundException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}
4

2 回答 2

2

If you do things like that, they will be executed in EDT(Event Dispatch Thread). You should move your logic outside of EDT by starting a new Thread to allow Swing to repaint UI properly and post updates to UI as following:

SwingUtilities.invokeLater(new Runnable() {
    public void run() {
      // Your Code Here
    }
});

Also consider use of javax.swing.SwingWorker, javax.swing.Timer and take a look at Concurrency in Swing.

于 2013-08-07T16:43:59.090 回答
2

I guess, your code runs not on the EDT thread. If it runs, you should move that to the other one.

Then, you can use from that other thread in order to update Swing UI elements:

SwingUtilities.invokeLater(new Runnable() {
    public void run() {
        tfFIXMsg.append( inputLine + "\n\n\n");
        // or whatever swing action you want to perform...
    }
});

If you need more sophisticated solutions try using SwingWorker class.

于 2013-08-07T16:44:46.773 回答