如何使 Java 在同一命令提示符窗口中打开批处理文件

Question

I am trying to make a console-based Java application that starts some batch scripts that do some other irrelevant things. Presently, I just want to find the proof of concept

I have tried to use the following code:

Runtime.getRuntime().exec("cmd /c start pathtomybatch.bat"); 

This works fine until I turn it into a .jar file and attempt to execute it. Then it opens the batch file in a new command prompt window, which I don't want it to do. I want to open the batch file in the same window that my Java program is running in. I read about the start command on TechNet and SS64 and found out that apparently adding changing start to start /b would open the program in the same command prompt window. However, when I try to run this:

Runtime.getRuntime().exec("cmd /c start /b pathtomybatch.bat"); 

NetBeans says BUILD SUCCESSFUL for both lines of code, but when I try the second line of code, no command prompt window opens and my batch file doesn't get started.

I want to know how I can make Java open that batch file within the same command prompt window without stopping the Java application or waiting for it to finish.

Also, as a tiny extra request, could someone tell me if I could do the same for an .exe file?

I'm on Windows 7, but I want this app to work for people using Vista or newer.

Answer 1

The extra window is coming from the start command you initiate. See https://www.windows-commandline.com/cmd-start-command/

A better pattern is to use

Process p = Runtime.getRuntime().exec("cmd /c pathtomybatch.bat"); 

Then make sure you loop until p.exitValue() no longer throws an exception (which means the process has exited), and while looping copy all available bytes from p.getOutputStream() and p.getErrorStream() to System.out and/or System.err.