How to run a batch file inside Java package using Java code?

Question

I need to run a batch file which is already inside of my Java package. Below is my code.

public class ScheduleTest {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws IOException {

       Process exec = Runtime.getRuntime().exec("test.bat");
    }

}

test.bat is located inside the scheduletest package, where the ScheduleTest class also located. Below is the package structure.

enter image description here

How can I make this happen?

EDIT

This is the content of my batch file

echo hello;
pause

M A · Accepted Answer · 2015-05-17 16:02:41Z

1

Normally when your IDE compiles the sources, the test.bat should be placed in the folder that contains the binaries, preserving the same package structure, e.g. bin/scheduletest/test.bat. Assuming this, you can load the batch file using a classloader:

ClassLoader loader = ScheduleTest.class.getClassLoader();
URL resource = loader.getResource("scheduletest/test.bat");
Process exec = Runtime.getRuntime().exec(resource.getPath());

To read the output of the process, you'll need to get its input stream:

InputStream inputStream = exec.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(inputStream));
String line = null;
while((line = br.readLine()) != null) {
    System.out.println(line);
}

However it's much better to have a resource directory for it, since automatic build procedures (e.g. Ant or Maven) would delete this file when cleaning.

edited May 17, 2015 at 16:02

answered May 17, 2015 at 15:53

M A

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4 Comments

ktorn Over a year ago

I would not put it directly in the binaries of the IDE as you may find that cleaning your project will automatically delete your batch file too. What you want is for the IDE or build system to copy it to the bin as part of the building process.

PeakGen Over a year ago

Thanks. It worked. However it is not showing any batch file to me. It happened even I gave it the complete batch file path. I have updated my question with the content of batch file.

M A Over a year ago

@JustCause You're not reading from the output stream of the process. See my updated answer.

PeakGen Over a year ago

Yiu are the best. Thanks.

ktorn · Accepted Answer · 2015-05-17 15:57:35Z

1

Unless you really need to have your batch file in your java source code folder, I would just move it up to the root of your project, or better yet, create a /resources folder and put it there.

Then you can have the IDE or build system copy it to your bin/build. Your existing code can then run properly.

answered May 17, 2015 at 15:57

ktorn

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