write output to command prompt using java

Question

I am trying to open a command prompt from a java class and send output to the new command prompt. I can open cmd using process. Gone through all the answers on SO,but couldn't figure out how can I pass the output to the just created cmd window.

Please reformulate. You want to output from a Java application to a distinct Windows CMD ? — rbntd
– rbntd, Commented Oct 17, 2016 at 12:07
If I'm not mistaken, the problem is that to display a cmd CLI, you have to call cmd /C start, where you call cmd (actually conhost?) and ask it to start another instance with a CLI. If you try to write to the process' OS, you're actually writing to the first cmd process, which has no interface. — Aaron
– Aaron, Commented Oct 17, 2016 at 12:36

Community · Accepted Answer · 2017-05-23 12:00:43Z

4

This might not be practical or even usable, but it does the job :

String[] command = {"cmd", "/c", "start", "cmd.exe"};
try {
    new ProcessBuilder(command).start();
    Robot r = new Robot();

    r.keyPress(KeyEvent.VK_SHIFT);
    r.keyPress(KeyEvent.VK_H);
    r.keyRelease(KeyEvent.VK_H);
    r.keyRelease(KeyEvent.VK_SHIFT);
    r.keyPress(KeyEvent.VK_E);
    r.keyRelease(KeyEvent.VK_E);
    r.keyPress(KeyEvent.VK_L);
    r.keyRelease(KeyEvent.VK_L);
    r.keyPress(KeyEvent.VK_L);
    r.keyRelease(KeyEvent.VK_L);
    r.keyPress(KeyEvent.VK_O);
    r.keyRelease(KeyEvent.VK_O);
} catch (IOException | AWTException e) {
    e.printStackTrace();
}

This opens a CMD and write (a bit too literally maybe) "Hello" in the CMD.

See this answer if you want to type a String.

edited May 23, 2017 at 12:00

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answered Oct 17, 2016 at 12:41

rbntd

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2 Comments

Aaron Over a year ago

God, this is awful... Here pour soul, take my upvote for having had to consider this possibility ! (On a more serious tone, if no better solution is found one should obviously create a function to translate a String to a list of keystrokes)

rbntd Over a year ago

@Aaron It has fortunately already been done ! stackoverflow.com/questions/1248510/convert-string-to-keyevents

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