Java command line exit command?

Question

I'm making a server, and it is on a Text Based Raspberry Pi. basically, everything is running from the command line, so when the server runs, there is no graphics, and it prints everything out using System.out.println(); . so my question is, instead of having a button that runs a shutdown() method, how can i make it so at any point in time, i am able to push, say, 'e', and the program will run the shutdown() method? i've done some searching, and am not sure quite how to phrase the question. i was thinking adding a keylistener , but im not sure if that can be added to nothing graphic? anyway, any help would be appreciated!!! thanks in advance

Answer 1

To register keyboard events you first need to have the focus on your program, and for that you need a gui. I suggest:

1.- Create a JLabel(and a scrollbar).

2.- Instead of using System.out.print("text");, use myJLabel.append("text" + "/n");. 

3.- Add a keyboard listener. Register key events so that the x key closes your server, the s key stops it, ...

As you have described your app, you can't write input to the server, you can only read output from it. I recomend step 4.

4.-Add a JTextFiel to send input to the server.

5.-To make it user-friendly , you could use a JEditorPane instead of a JLabel, and add HTML to your output.

Answer 2

Alright, so based on the comments, (which i up voted btw), i made a thread that constantly used scanner to see if i typed "exit". Thanks for all the help!

Answer 3

如果你不想拥有一个可见的gui，你可以与监听器一起创建一个“始终聚焦的隐形grafical接口”。