Java – create a command console

I have an unusual question: how to use swing to create a "command console"?

What I want is the console where the user types the command, presses enter, and displays the output of the command I don't want to allow users to change the "prompt" and old output I'm imagining windows CMD Something like exe

I read a question about this, but it didn't answer my question

Solution

BeanShell provides a jconsole, a command line input console, with the following functions:

>The flashing cursor > command history > cut / copy / paste, including using the CTRL arrow keys to Select > command completion > Unicode character input > color text output >... Is wrapped in the scroll pane

BeanShell jars are available from http://www.beanshell.org/download.html The source can be obtained from SVN co through SVN http://ikayzo.org/svn/beanshell

For more information about jconsole, see http://www.beanshell.org/manual/jconsole.html

The following is an example of using the jconsole of BeanShell in your application:

import java.awt.Color;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.Reader;

import javax.swing.JFrame;

import bsh.util.GUIConsoleInterface;
import bsh.util.JConsole;

/** 
 * Example of using the BeanShell project's JConsole in
 * your own application.
 * 
 * JConsole is a command line input console that has support 
 * for command history,cut/copy/paste,a blinking cursor,* command completion,Unicode character input,coloured text 
 * output and comes wrapped in a scroll pane.
 * 
 * For more info,see http://www.beanshell.org/manual/jconsole.html
 * 
 * @author tukushan
 */
public class JConsoleExample {

    public static void main(String[] args) {

        //define a frame and add a console to it
        JFrame frame = new JFrame("JConsole example");

        JConsole console = new JConsole();

        frame.getContentPane().add(console);
        frame.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(600,400);

        frame.setVisible(true);

        inputLoop(console,"JCE (type 'quit' to exit): ");

        System.exit(0);
    }

    /**
     * Print prompt and echos commands entered via the JConsole
     * 
     * @param console a GUIConsoleInterface which in addition to 
     *         basic input and output also provides coloured text
     *         output and name completion
     * @param prompt text to display before each input line
     */
    private static void inputLoop(GUIConsoleInterface console,String prompt) {
        Reader input = console.getIn();
        BufferedReader bufInput = new BufferedReader(input);

        String newline = System.getProperty("line.separator");

        console.print(prompt,Color.BLUE);

        String line;
        try {
            while ((line = bufInput.readLine()) != null) {
                console.print("You typed: " + line + newline,Color.ORANGE);

                // try to sync up the console
                //System.out.flush();
                //System.err.flush();
                //Thread.yield();  // this helps a little

                if (line.equals("quit")) break; 
                console.print(prompt,Color.BLUE);
            }
            bufInput.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}

Note: jconsole returns ";" If you press enter yourself