Dialog with changing text in swing

Question

I am developing a swing application in which I am running a cmd command using Runtime.getRuntime.execute(); and reading the output of command using BufferReader. Now what I want is I want to show the output in dialog with changing the text(Using JTextPane) inside it or appended strings in a textarea with the output of command like we can see while starting Eclipse of any other IDE for loading prerequisites.

I tried making subclass of JDialog class but it is not doing what i want.

My Code :

Process p = Runtime.getRuntime().exec(commandToBeExecuted);
            BufferedReader in = new BufferedReader(newInputStreamReader(p.getInputStream()));
            String line = null;
                  MessageDialog myDialog=new MessageDialog(UserInterface.this);

            while ((line = in.readLine()) != null) {
                  System.out.println(line);  
                  myDialog.setText(line);
                  myDialog.setVisible(true);
                  myDialog.setLocationRelativeTo(UserInterface.this);
            }
        } catch (Exception ex) {
            Logger.getLogger(UserInterface.class.getName()).log(Level.SEVERE, null, ex);
            errorGlobal.setText("Some Exception Occured in update "+ex.getMessage());
            System.out.println("Exception occured " + ex.getMessage());
        }

Is it possible to do what I want and what will be the best way to achieve this ?

1) Read (and implement) *all* the recommendations of [When Runtime.exec() won't](http://www.javaworld.com/jw-12-2000/jw-1229-traps.html). That might solve the problem. If not, it should provide more information as to the reason it failed. Then ignore that it refers to `exec` and build the `Process` using a `ProcessBuilder`. Also break a `String arg` into `String[] args` to account for arguments which themselves contain spaces. 2) For better help sooner, post an [SSCCE](http://sscce.org/). — Andrew Thompson, Jul 21 '13 at 08:29
You say it is "not doing what i want". What do you mean by that? — tbodt, Jul 21 '13 at 08:31
Please have a look at this [example](https://www.dropbox.com/s/ocv7zhospy95map/SwingWorkerExample.java), it might can give you the desired idea. Just run the Program, click `Start` Button, then type anything on the console, it will be displayed on the `JTextArea`, if you want to stop performing reading from the `Console`, click `Stop` Button. Though it is not fully done with, its under progress now :-) — nIcE cOw, Jul 21 '13 at 09:09
it is not changing the text the dialog is completely empty. Only the text text will be shown when execution completed. — Piyush Agarwal, Jul 21 '13 at 09:15
@pyus13 : Click start button, then type on the console. What you type on console, will be added to the JTextArea. Moreover, you might be looking for is, this method [myDialog.setTitle(...)](http://docs.oracle.com/javase/7/docs/api/java/awt/Dialog.html#setTitle(java.lang.String)) — nIcE cOw, Jul 21 '13 at 09:41

score 0 · Answer 1 · answered Jul 21 '13 at 08:23

0

Your problem is in the loop. Use JTextArea.append and put the rest outside the loop,

answered Jul 21 '13 at 08:23

tbodt

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I am not using JtextArea at all I am using appending text is second choice i want to change the same text with new one which is not working. – Piyush Agarwal Jul 21 '13 at 09:38
*"I am not using JtextArea"* For better help sooner.. ah why bother? You ignored me before. – Andrew Thompson Jul 21 '13 at 18:43

Dialog with changing text in swing

1 Answers1