Running a batch file from java

Question

I just downloaded MCP to see how things work behind the scenes in Minecraft.

Inside MCP there are a bunch of batch files that you use to do things like: decompile, recompile, startclient, etc.

What I would like to be able to do is run these batch files from a basic java gui.

I'm good with the gui part but I havent got a clue how to run those batch files.

Here is an example of one of the batch files:

The file is at:

C:\MCP\startclient.bat

startclient contains the following:

@echo off

:try_python
set PYTHON=python
%PYTHON% --version >NUL 2>NUL
if errorlevel 1 goto try_python_mcp
goto foundit

:try_python_mcp
set PYTHON=runtime\bin\python\python_mcp
%PYTHON% --version >NUL 2>NUL
if errorlevel 1 (
    echo Unable to locate python.
    pause
    exit /b
)

:foundit
%PYTHON% runtime\startclient.py conf\mcp.cfg
pause

Can it be done?

I am surprised they do not offer an x-plat build.xml or similar. What decade(/millennium) are they developing in? — Andrew Thompson
– Andrew Thompson, Commented May 27, 2011 at 22:30

MByD · Accepted Answer · 2011-05-27 22:04:35Z

4

You can easily run a batch file from java using Runtime:

Process p = Runtime.getRuntime().exec("cmd /c start " + yourbatchFileName);

you can also grab I/O of the process, using p.getOutputStream(), p.getInputStream() etc.

See more about the Process class here.

And I suggest you take a look at this article as well.

answered May 27, 2011 at 22:04

MByD

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10 Comments

Piyush Mattoo Over a year ago

But this would be outside JVM.

MByD Over a year ago

Batch files are not intended for java, but for (usually) windows cmd, this is the only way I know about running those from java with maximum control.

Andrew Thompson Over a year ago

Good call on adding the link to the Java World 'gotchas' article. Anybody that attempts to use a Process needs to read that, sooner or later.

Gubbinz Over a year ago

So I plugged in: Process p = Runtime.getRuntime().exec("cmd /c start C:\\MCP\\recompile.bat");

Gubbinz Over a year ago

But when it pops up it complains: Unable to locate python. Then it exits to the java project folder, not the MCP folder? Might be noobish but, do I need to start cmd in the MCP folder for it to work?

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