get Result from shell command on jTextArea

Question

I have to execute a shell commande windows from java swing app and get real time result :

String cmd = jTextField1.getText(); StringBuffer output = new StringBuffer(); Process p; try { p = Runtime.getRuntime().exec(cmd); BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream())); String line = ""; while ((line = reader.readLine()) != null) { System.out.println("" + line); jTextArea1.append(line + "\n"); } } catch (Exception e) { e.printStackTrace(); }

the problem is that writing in jTextArea is after execute finish not real time like System.out.println(..) .

ospf · Accepted Answer · 2016-06-16 12:38:45Z

When you update swing components from outside the Event Dispatch Thread (EDT) you should use either a SwingWorker or call SwingUtilities.invokeLater() like this:

while ((line = reader.readLine()) != null) { final String appendLine = line + "\n"; System.out.println("" + line); SwingUtilities.invokeLater(new Runnable(){ public void run(){ jTextArea1.append(appendLine); } }); }

Anand Undavia · Accepted Answer · 2016-06-16 11:49:00Z

Try creating a Thread and use Thread.sleep() to do the live updating of the JTextArea.

Create a subclass like following

class Work implements Runnable { String cmd; Work(String c) { this.cmd = c; } @Override public void run() { Process p; try { p = Runtime.getRuntime().exec(cmd); BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream())); String line = ""; while ((line = reader.readLine()) != null) { System.out.println("" + line); Thread.sleep(500); jTextArea1.append(line + "\n"); } } catch (IOException | InterruptedException e) { e.printStackTrace(); } } }

Change the code as following

String cmd = jTextField1.getText(); StringBuffer output = new StringBuffer(); new Thread(new Work(cmd)).start()

This is incorrectly synchronized; a better approach is shown here.

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