Question

How might I get the output from a CMD process to display in my GUI? This is the code I’m using to run the process:

try {     String line;     Process p = Runtime.getRuntime().exec('cmd /c \'e:\\folder\\someCommands.cmd\'');     BufferedReader input =             new BufferedReader(new InputStreamReader(p.getInputStream()));     while ((line = input.readLine()) != null) {         System.out.println(line);     }     input.close(); } catch (Exception err) {     err.printStackTrace(); } 

I’ve tried doing this:

jLabel1.setText(line); 

…but the GUI is completely locked up while the process is running, so nothing updates until the very end, which isn’t very useful. Other than that the CMD works fine. I just want to display the output in real-time.

Answer 1

Did you repaint() after setting the text of the label?

Anyway, you should generally be hesitant to execute a long operation on the GUI event thread. Look into using a SwingWorker instead.